327???

The car weighs ~3250 going down the road. The TD setup is identical to mw66nova's old setup, headman s-bend pipes to a summit H-pipe with the mufflers dumped at the axle.

I have to correct myself, the car has a TH350 in it now and did when I ran those times too. The converter I listed was correct though.

The 60' was 1.75, tires were 235/70r15 et street radials, suspension is all stock IROC pieces

skinny z

That's actually less gear than I run (3.73's with a 700R4) a taller tire (26" drag radial) and you're a half tenth quicker 60'.
I've got to get better exhaust.
It sure helps to be a little lighter too.
Isn't the ratio something like a tenth for every 100 lbs?

327???

What are you trapping? Stall?

I think this cam still has more in it, I'm hoping for an 11.99 this year. Then maybe hit it with a 150 shot and get booted for no roll bar.

100lbs for .1 sounds about right.

skinny z

Typically through the lights at 102. Around 5500 rpm.
Best 13.46 @ 102.05 w/1.93 60' and another 13.49 @ 100.8 w/1.89 60'.
TCI Breakaway. Flash stalls to 2800+/-.

327???

You're either a lot heavier than me or down a bunch of power. What is your exact setup? Heads? cam? compression? exhaust? etc...

skinny z

3700 lbs with me and a half a tank of fuel.

350 cid/standardbore/stroke/rod length
Vortec heads. 3 angle valve job, no porting, 64cc measured.
9.97:1 static CR measured. ( .028 gaskets, .025 below deck, -6cc piston )
205 PSI cranking pressure.
Comp 268H flat tappet cam ( old single pattern version)
268 ADV
218 @ 05"
110 LSA
102 ICL
4 degrees advanced
.488" lift w/ Comp Pro Magnum 1.6 rockers
600 vac sec Holley
34 degrees total advance w/ 12 initial
94 Octane
Currently using Hedman shorty headers with 2.25 y-pipe and 3" cat and 3" flowmaster cat back system
TCI 1000 over stock stall converter (flash @ 2750+/-)
3700 lbs. race weight
3.73 posi w/ 26" drag radials
Best pass. 13.4 @ 102.5. 1.9 60'.
20 mpg hiway.


I'm pretty sure my current exhaust is killing me.
Fix the exhaust, ( LT headers, cut outs) and a race specific carb tune will drop a few tenths.
Add another 500-750 stall.
12's?

Orr89RocZ

iTrader: (20)

thats abit of a problem

And that exhaust is hurting just a tad. better carb will net some gains. DEFINATELY 700 rpms more stall speed. Go for 3500 or so with that setup. You should get that 60 foot more in the 1.7 range and you'll have 12's

skinny z

That's my thinking.
I'd really like to pull that off with the little cam.
Exhaust aside, I think I've got the combo working well.
A TCI Street Fighter 1500 rpm over stock stall convertor (should be close to 3500) and LT headers might do it.
There's not too much I can do about the weight.

Orr89RocZ

iTrader: (20)

Keep an eye on the weather conditions on the day of racing. My car only went 13.2's on good air days, late summer when the temps dropped to 50-60 degrees at night. density altitude is the important thing to keep an eye on. Those days the DA was around 1500ft. When i ran 12.95, the DA was 188 ft BIG difference and it showed, i gained 3 tenths just about.

mw66nova

iTrader: (13)

skinny z, that car would straight LOVE a 650 double pumper, hedman longtubes with dual 2.5" pipes, and a 3500 stall. i bet you'd drop close to .7 off your times with those things...

1983Z28

My combination is in my signature - race weight is 3550 lbs with 297 rwhp.

12.584 @ 108.8 mph with 1.737 60'.

89formula350b2l

iTrader: (11)

new time best of 12.46 @ 108.37 with 60' time of 1.72...i need 373 gears badly

p.haze92

1992 L98 B4C
.030 stock block(355)
Vortec heads(ported)
SD big mouth base(ported to match heads and open it up)
SLP runners(siamesed alot more)
ported plenum
58mm TB
30lb Accel Injectors
Comp Cams CC 502 218/224 528/536 w/ Pro mag RR's, 112* lobe sep
Custom headers & exhaust(3") w/ crossflow Flowmaster and dual 2.5 tips
Edge 2800 stall
Factory 3.23 gears
spohn torque arm
umi subframes
245/50/16 Nitto DR's
Air Pump!
EGR!
PCMforless initial burned chip

Very first run at the track netted 12.97 @ 102.2 w/ 1.729 60'. Best that day was 12.851 @ 100.914 w/ 1.694 60'. This was with 52psi fuel pressure.

Latest best was last friday, 12.793 @ 103.97 w/ 1.649 60'. I am in Phoenix AZ so the air sucks. DA at the time of this run was roughly 3059 feet. Needs another chip burned to lean it out a little. A/F is around 10-11. Also, the car tends to nose over after 4k somewhat! Need to datalog the car someday.

Link to some pics of the rebuild.http://www.sspmustang.org/forums/showthread.php?t=2829

Vid of 12.85 run. http://www.youtube.com/watch?v=kGU_IsHD_pw

Orr89RocZ

iTrader: (20)

^^^^^^^^ that aint too bad, with some tuning it should only get better at that altitude. lean it out to 13 to 1 and it will make power

91interceptorZ

iTrader: (3)

Ran 12.87 @ 109.1mph at well above sea level (Idaho)......
stock L98 block HSR intake, MSD ign., underdriver pulley, procomp alum. heads 2.02 1.60, 1.5 roller rockers, shorty headers, 3.42 gears, stock compression ratio, small build 700r4, 1800 stall, full stock weight car, Crane cam #104224, 24lb inj., LT4 knock sensor (very noticable), stock computer, couple other things........run 89 octane gas, 20 MPG WITH FOOT TO THE FLOOR AND THE A/C BLOWIN'!!!

MAN I LOVE THESE CARS!!!

z28freak84

How are them procomp heads treating you? How long u had them? how many miles?
And what what the 1/8 et and mph?

Orr89RocZ

iTrader: (20)

wow great time for that setup! thats a mild cam too

91interceptorZ

iTrader: (3)

well i went with the procomp heads for one reason....my budget....i got them from an ebay store for about $400 shipped for the pair (bare of course)..i can't remember what they claimed the flow numbers were but i remember the were pretty good (255cfm at .060 or something....i can find them if you want)....they were built in australia....when the heads arrived I only found one thing wrong and one thing i didn't like.......the passenger side heads holes for the bracket (a/c, smog) one of them didn't line up exactly (but have had no problems what so ever with that).....and also the intake and exhaust ports (just up from the valve seats).....needed a little extra porting to smooth out a lip left by the casting...but otherwise I have had no problems and am very happy with the heads....i run it hard and nothing has gone amiss.... if your on a budget check these out, if you have the money get a set of better heads (but i do love mine)...i've had them on the car from last summer to now...racing every weekend either autocross or drag racing, and cruisin' at the local cruise...i'll have to pull up the 1/8 mile times for you when I get home and get my time slips..

91interceptorZ

iTrader: (3)

yeah the car is a "B4C special service package" (police package)....which i don't think that has anything to do with how fast it is....but then again it was fast is stock form...(14.03 at 99.0mph was best) and even other camaros with minor mods were pulling 14.5's or slower...so it's always been fun.........the CAM i chose because of the compatability with the stock computer (which a computer mod is the next thing i'm doing), but I didn't want to go too crazy because i use the car to cruise around and do road course and auto cross racing.....any bigger cam would not have worked well except for draggin' i think......but one thing is for sure the cam sounds like it's pretty big...the car lope's really well and sounds very very good....i did not expect that much lope at all.....i'll post the new times and see how well pcmforless.com improves my times....i think i am still getting some phantom knock signals witch also may be holding me back...but pcmforless says he will fix that with a desentative setting.

p.haze92

Those are amazing times InterceptorZ with no stall, tune and altitude problems! Couple of questions, what are you 60' times and are your times corrected for DA? Also, post some pics of that beast!

91interceptorZ

iTrader: (3)

i'll have to find my camera and get some pics on here, car looks real good (i think so anyway) and get compliments all the time......my 60' times are around 1.85 to 1.90....which is kinda slow off the line put pulls real hard after the initial roll.....car actually used to to run constant 1.88 60' times with only msd and underdriver pullies.....doesn't have the bottom power it used to but midrange and up is insane......oh and the convertor is a 4300 v6 out of a s10....same size as camaro but stalls up a little higher than stock (might be higher than 1800) the air was very very nice that day even though we are so high up in altitude....i think we were at 2500-3000 ft. but was only like 50 degrees out with a nice tail wind....was not corrected for altitude that was the actuall posted time....i think i can take a picture of the time slip and post the pic of it too, if it turns out......the only other things i did were running 91 octane and fuel additive, and no air cleaners...which is good for a noticable time diffence ( even running K&N cleaners)....I have NO idea why the car is so quick....but it has always been even when stock....i used to beat other Z's with mods when I had none......i'm curious as to why that is but have no good answer....oh and i will be doing a dyno day with some buddies and will post those for ya guys too...I don't know if i posted all my mods but pretty much everything is aftermarket except for the block, crank, and pistons.....even all suspension, and brakes modded too...

p.haze92

Nice, I love B4C's if you couldnt tell. I have gotten several of my B4C's in the 13's pretty much stock after a good tune-up and maybe a catback on it. My current daily driver is a 1991 B4C from the FBI. It runs 14.17 @ 97.

Once I have my CHP car dialed in more after a another chip, I have kicked around the idea of going to a Holley Stealth Ram. But, I dont want to loose to much torque. This car is way too fun launching with a 1.6 60'. Did you add the 3.42's? What gear and RPM are you going through the traps at?

Orr89RocZ

iTrader: (20)

my Stock L98 put down 315wtq with the HSR after a tune and 60 footed better than stock TPI. you will still have torque.. granted i had a 2800 stall torque converter in the car so all rpms below that are meaningless but the car pulled so great all over with the HSR, you cant go wrong.

91interceptorZ

iTrader: (3)

i think i'm turning 4k through the traps...the car came with 3.42 gears in it, which i just had recently rebuilt. I'm running 26" inch tall tire i believe. 255-50-16.....my car is an ex idaho state police car, that was bought by the officer who drove it when the car was retired, he drove it for years then his wife, the car was bone stock in mint condition when i got it (sweeeet) oh, I also have some interceptor badges that you might be interested in.....i'll take a pic of it and post it when i get a chance......everyone reads the badge and goes crazy, i hated people seeing the RS badges and making a comment (even though they don't know what the hell they're talking about) and replaced them.....just a thought, (don't know why i thought of the badges but....ok) I put my HSR on before I got my heads and came and i really didn't loose any bottom end power at least not enough to really matter....but the mid range improved and lots of upper end power, it pretty much pulled evenly with no power loss smoothly all the way up the RPM band....it wasn't till i put the headers, heads, and came in that i lost some noticable bottom end.......you said 1.6 60', where you using slicks???that's awesome fast off the line.....i ran mine all on street tires, no slicks....

p.haze92

Nitto 555 Drag radials 245/50/16's. My car has the factory 3.23 gears and I am going through the lights at close to 4800rpm in 3rd. Get these tires really hot and it will 60' in the 1.6's, otherwise it goes up in smoke.

The B4C's came 2 ways, 305 5spd w/ 3.42 gears and the L98 350 w/ 3.23 gears. Wonder who put 3.42's in your car? Also, look in the history thread about calling all 1991 and 1992 B4C's. If you havent posted on there, please do, I need your vin!

91interceptorZ

iTrader: (3)

can you post a link to the page.......what's the vin number for??? yeah I had known that all of them came (l98) with 3.23....but i had a pinion bearing go out in the car and needed to have it rebuilt....so i bought 3.42's thinking it would be an upgrade...well the driveline shop said that the original gears were 3.42s....I know the shop is very very acurate and good, so they didn't get it wrong, and I still know the original owner, he said no rear end work to his knowledge and i have all the paperwork on the car down to every wiper blade and oil change, nothing.....the driveline shop said they were, as far as he could tell, the original gears......i was kinda stumped by that but didn't really try to research it anymore.....I wonder what's up with that....

p.haze92

https://www.thirdgen.org/forums/hist...91-1992-a.html

It should explain what we are trying to do. All I know is, your car came from the factory w/ 3.23's. One could argue, "well maybe a mix up at the factory". I doubt it since most police vehicles get the speedo's calibrated yearly at least. Pictures when you can. Was it originally black and white?

Alot of good 12 sec. combo's on here. When I first started to rebuild my car, there were very few combo's that I had seen. I saw so many cars with tons of mods, but no timeslips or dyno's to back up the mods. Good work guys, just wish it was easier to tune these old commodore 64 computers!!!!!

Orr89RocZ

iTrader: (20)

you can figure it out by your tire size, mph and rpm. Go 50 mph and record RPM. then with your tire size you can figure your gear size.

i also thought no 350 car came with gears greater than 3.23

p.haze92

They didnt in the 3rd gens.

skinny z

Looks like I'm finally on to something.
Went to a bigger stall convertor (TCI Street Fighter) and finally have my LT headers with a custom Y-pipe.
Huge seat of the pants improvements. Judging from other mods that got me to 13.4 sec @ 102 gets me thinking that I've got another 1/2 sec.

skinny z

So, after having to get the short block rebuilt because of a wiped out hydraulic flat tappet cam and upgrading to a larger XR276HR (from a little old school 268H cam) I found the 1/2 second I was thinking of.
13.2 @ 100mph with the trans shifting automatically at 5200-5400 rpm.
Only problem is the 1/2 sec comes off a best 13.6, not 13.4 like I remembered. There's an easy 2 or 3 tenths just working the launch and shift points. Still looking for 12's.

Orr89RocZ

iTrader: (20)

wow man your closing in but still abit off the mark. seems like that cam and such should easily get 12's at a few more mph higher than what your trapping

skinny z

I only made a single pass and had the trans do the shifting. Shifting at around 5000rpm dosen't do much for your et or trap speed. I was cruising through the lights at 3500 in OD.
That was the only pass I had a chance to make. Last year, I was shifting manually around 6000 and trapping at 5000 in drive. That would get me 102 mph. I'm pretty sure that I can get 12's with last years shifting technique and this years combo.

V6Turbo

My setup was a totally stock Turbo Trans Am with a chip and K&N filter, using a non-drag radial Yokohama H-rated tire @25PSI. 12.42@111.35 w/ 1.75 short time. I never got a good pass after the mods due to breakages but should run low 11's w/cam, head work and upgraded turbo.

skinny z

Finally I can add my own car to the lsit.
12.98 @ 106 mph w/ 1.84 60'.
Had a better 60' on my first pass with a 1.77 although that only yielded a 13.08 @ 104.
Last one for a while. Busted something in the BW 9 bolt.

91RamAir Formula

OK my time is in my sig
I've got a afr195 headed 383 w/ 8.5:1 comp CC306 cam 236/244@.050 .544/.576 lift 1.6rr's. HSR intake w30lb injectors and Megasquirt engine managment.
Hooker long tubes dual 3"Y into single 3.5" mufflex setup.
Upgraded 700R4 w 3000 lockup stall. Need more for better 60'
Suspension stock TA tubular ctrl arms w relocation brackets tube panhard 16" ET street radials.
Car weighs 3446 w me in it.

12.71@107.52 1.82 60' 4300'DA

skinny z

Based on that info, I'm sure there's another 1/2 in ET for me. You too Ram Air considering with proper suspension and gearing your 107+mph could get you 12.20's. Calculations say with your vehicle and trap speed you're pushing +/-330rwhp.

Orr89RocZ

iTrader: (20)

why 8.5 to 1 compression!!!?? you boosting it eventually?

91RamAir Formula

That was the plan when I built the motor 2 years ago To have a 76mm single turbo by now, but now I've turned into a baby maker and second on the way now so it's kind of been on the back burner. I wish I'd bumped up the compression, I'm thinking about shaving the heads down to 64cc's and going with a thinner head gasket to help out a little. And I totally agree I need suspension work I need an adjustable ta and springs/shocks as well as a bigger stall I was thinking like a 3600 what do you guys think? If I can get it into the 11's on motor than I'll spray it.

Also that time posted above is the only run I have here in AZ got rained out that day after first run but I've since switched from the stock TB to an accell 58mm I'm curious to see if it pickes up anything seeing that was the only stock piece of the motor left except for the lifters. I'll keep you posted.

Orr89RocZ

iTrader: (20)

you'd be in the 11's with 10+ compression and maybe better DA. 4300 sucks! it be nice to spray the hell out of that motor tho

mw66nova

iTrader: (13)

congrats skinny z! now quit breakin' stuff and get back out there....that motor should be well in the 12's honestly!

91RamAir Formula

that funny Orr89RocZ I was just looking at your car's specs on the side under your avatar and we have very similar setups 383HSR 4thgen 3.73rear 700r4 what cam you runing?

Orr89RocZ

iTrader: (20)

i'm running a custom grind, 230/245 on a 109 lsa with abit over .600 lift with 1.6's. its got some nitrous capability and posisbly some minor boost ability too. I wanted it to handle a 150-200 shot well and its gonna be a blast.

motor is similar to yours but with n/a 11 to 1 compression. BTW i have 3600 stall and its perfect for this car. torque is peaked at around 4000 rpm but its flat from 3500-4700

KWIK84

iTrader: (5)

12.50 @ 107 1.685 short times

350 +.060
9.5:1 compression
Lunati Voodoo 60103
416's ported with 1.94 valve
Weiand Single Plane 7546
3.73's & TH400 w/3500 convertor
Hedman LT's

skinny z

Thanks.
Now I'm looking for a new diff.
What I think will happen is a rebuild of the existing piece if I can find a nice, new made in the USA gearset.
I'll have to avoid the slicks too. Broke it once, you know you'll break it again.
At least I can cruise for the rest of the season.
Then it's a Moser.
I just happen to have a nice clean 86 coupe that's looking for a nice drivetrain.
That will be the new car in the spring.

3rdBird

iTrader: (1)

12.2 @ 105 mph, 1.65 - 60'
Bone stock factory 5.7 w/ factory TPI.
TH400 w/3000 stall
Spohn rear suspension
Factory 10 bolt w/ 373 gears
125 shot N20

bluegrassz

iTrader: (3)

Well I just got my new best last night.

60 ft -----1.62
1/8 et-----7.641
1/8 mph---90.02
1/4 et-----12.01
1/4 mph---112.45

I still need to do more carb tunning. I was hoping for that 11 sec time slip. I ran it on 93 but should have added some 110 race fuel. That might have pushed it over. lol

My old best is in my sig.

Orr89RocZ

iTrader: (20)

bluegrass, how is your topend tune on that car? you have a nice 1/8 mile trap but the 1/4 trap seems a touch low. i would figure 114-115mph out of that setup

I've trapped 91-92 in the 1/8 and went 116

bluegrassz

iTrader: (3)

Well, Im crossing the line right at 5900-6000 rpm. I havent tried jetting up for mph yet. I will have to find the paper were I wrote down the jets. They are the stock jet settings from Holley.

Im picking up on average 22mph after the 1/8 mile finish line.
I have tried shifting at 5800 and then at 6000. It runs faster shifting at 6k. I have tried 6500, but it seems to flatten out. MY friend said it was backfiring when I let off after the 1/4.

I did notice once last night when I shut it off, I got a extra chug. My timing may be too high. Its running between 39* and 40*.

I changed plugs before I went to the track. I was run ACFR3LS at .035 gap, but I switched to Champion CR12YC at .035. When I check them at the end of the night, they were still white. No brown or black at all.

Oh yeah, I keep the fuel pressure between 6 and 6 1/2.

TB2

iTrader: (1)

12.7 @ 114.6mph, 1.88 60ft. The car desperetly needs more stall. With the cam I'm running, the motor doesn't come on till 4500rpm. Thats about 50ft out of the chute. Then it comes on strong, and is still pulling stong at the end.


84 Trans Am 3200 pounds Frames are tied w 8point cage.
Early LT1 Short Block assy.
Ported World Prdt Sporstman Heads
Crane Gold Rockers w Stud Girdles
Comp Cam XE294H Lift .519 .523, Duration At 0.006 294 306
800cfm Holley dp. Weiand Team G intake.
Hooker Super Comp with 3" dual exh. & Moroso Spiral Core Mufflers.
Turbo 400 w 3000 stall.
Moser 9" w 4.10 gears.
28x9x15 M/T Slicks.