nelapse

iTrader: (17)

Please post your best times for your base TPI set ups. Please include all your modifications especially modifications to your TPI system.

I have yet to run my car, just trying to figure out a great way to use TPI.
Also, if you have times for a setup that did not work out post that setup and time and tell us why it did not work out!

1989GTATransAm

iTrader: (3)

See signature. I'm hoping to lower the times quite abit with my next build up also shown in my signature. Should have the new motor installed sometime in November.

nelapse

iTrader: (17)

I am eager to see what I would make in the quarter. With the setup I have listed I am hoping atleast mid 13's

Blu91Z28

See sig and Cardomain link for mods. I'm still running my factory runners and base with a ported plenum.

chevy385

See sig. for specs and time. Still have lots of work to do in the tuning dept and have a Pypes 3" catback to put on yet. So times should improve...but you have to start somewhere In case the sig. is not there, the time thus far is 14.74@101.1MPH

Guest

13.85@104
305, SLP 1 5/8" headers, 7psi.

LB9GTA

iTrader: (1)

in dah sig

GuitarJunki17

iTrader: (1)

Prev. Owner = 14.6 w/ flowmaster 40 series muffler and Accel ignition coil, bone stock otherwise.

My time = 14.7 w/ headers added, but severe traction issues, as my rear is wearing down.

3rdgenZ

iTrader: (1)

14.23 @ 94.77

hooker comp with crappy hand made Y
2800 stall built trany
373 eaton posi (too much gear for now)
K&Ns
MSD 6AL
it still needs a good tune and i have some traction problems.
i dont see how you couldnt get a least some high 13s with those mods. do you have a stock cam?

90 white Z

If more people voice their input in this thread it should be a sticky. IMHO could get interesting

MARO-MAN

305 TPI w/stock intake, runner, plenum, throttle body. Mods & times in sig. Cool thread. -Nick.

IROCThe5.7L

14.3@96. Stock engine with headers and free mods. 2.77 rear, stock stall.

GuitarJunki17

iTrader: (1)

Was that directed towards me?

88BlackZ-51

iTrader: (2)

13.71@101 with a 1.99 60 foot.

stock L98 with exhaust mods.

91greenbird

iTrader: (4)

14.4 launching at idle in drive with a 2.145 60 foot time to ditch the 2.77

nelapse

iTrader: (17)

It was rumored once that there are not many TPI's in the 12's. Looks to be true. I suppose the TPI becomes the bottle neck around 13's. What kind of times have people been running with siamesed runners and plenums? I am not looking to change the TPI a whole lot. I rather keep it some what TPI.

3rdgenZ

iTrader: (1)

while that may be true; it doent mean its hard. they have a guy at my local track that has a L98 with a ported stock base,ported SLP runners,edlbrock performer heads, and a Lt4 hot cam running 12.8-12.9s
thats a relively cheap combo.

GregWestphal

iTrader: (1)

I was running in the mid-12's last year (best is a 12.47 @ 110.31) with ported SLP runners and Edelbrock manifold. My engine is a 355 with TF 23* heads, LT4 HOT cam, 10.5 comp, Hooker 2055 headers, etc. With the stock runners and unported E manifold, I ran 13.5 at 100 mph but not much timing due to detonation issues.

3rdgenZ

iTrader: (1)

no, it was for nelapse.

Guest

There's a bunch of TPI's local to me running 12's. I'm one of the few who isnt

nelapse

iTrader: (17)

The cam I have is a corvette l98 cam. I been wanting to do an lt4 but I am not sure if my aluminum l98 heads can take the lift.
Makes me wonder if a ported stock base could be just as good as or better than the edelbrock one.
My goal is mid 13's with my current setup. However I am getting a stock 700r4 to replace my T-5. It has a stock TC so maybe I should be thinking 14's?

3rdgenZ

iTrader: (1)

you should be around there,nelapse.

IROCZ4BD3

iTrader: (4)

see sig. but stock bottom 305

GuitarJunki17

iTrader: (1)

Damn dude that is a great time, you sure that motor is stock? What system are you running?

nelapse

iTrader: (17)

Hope so, I have never raced with an automatic before so I am kinda worried lol... plus I am sure it will help one day when I get a decent TC. But I sure hope a stock 700r4 can get the job done... on some 13's

1991CamaroRslow

iTrader: (3)

Stock 200,000 plus mile 1987 L98 with a siamesed plenum and radiused runner entries, long tube headers with duals, gutted air box with K&N's, MSD 6A, Walbro 255lph fuel pump, and a de screeened maf was good for a 8.9 in the 8th 13.8 1/4, 150 shot got me an 8.0 in the 8th 12.5 in the quarter the same day. Installed an H pipe, and 1.6 roller rockers with NGK TR6 plugs and took it to the local 8th mile track got an 8.7 on motor, 7.9 on spray. Next round of mods includes a ported lower intake, LS1 injectors, and new prom; for the nitrous side, I'm moving up to a .073, .043 jet combo. I'll post times if I can get to the track once more this year.

chikn305

iTrader: (2)

When I had the tpi 305 in my formula it went 11.8's @112.xx 1/4 & 7.5's @90.xx with 1.5x 60's on a 160 shot & the one time I ran it on motor it went 13.2 @ 102. The combo was ported plenum, stock tb, edelbrock runners, tpis big mouth base, edelbrock headers, lpe 211 cam, 1.6 rr, ported s/r torquers, 19lb injectors, afpr, built 700 w/ a vigilante 2800 converte, 3.73 gear, dynomax super turbo catback, & 275/60/156 mt et street radials.

88BlackZ-51

iTrader: (2)

am i sure its stock? yes i am sure!

i am currently about to change my exhaust again, and then i am going to install some pulleys. this should put me in the 13.5x range@102.
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nelapse? huh!

1991CamaroRslow

iTrader: (3)

88BlackZ-51 You have a TPI in a vette correct? My car's got an almost garunteed 13.7 in it next time out and it has iron heads and a smaller cam than most TPI 350's. My motor still has stock intake gaskets on it so I'm about 99% sure it's completely stock with my own bolt ons.

Xophertony

14.3 @95 with a TPI350 and th700r4. othermods include SLP 1 3/4" headers and y. 3" hooker catback exhaust, hooker aero-chamber muffler. no AC and no AIR pump.

then the tranny swap

14.4@97 with TPI350 and WC-T5. othermods include SLP 1 3/4" headers and y. 3" hooker catback exhaust, hooker aero-chamber muffler. no AC and no AIR pump. poly-mount on the tranny, centerforce dual friction clutch.


both of these times were done in full street trim. no airing down, no drag tires, no brake bias changes. i have crappy cooper-cobra tires on imitation centerline 15" wheels (prior owner ditched the GTAs). car has stock 3.27 gears, PBR rear discs, and almost no weight reduction. with me in it it tips the scales at 3,360 LBS.

maroon88iroc

iTrader: (7)

i ran a 15.3@88mph with my 305 tpi 700r4. i had a flowmaster catback and a hypertech chip and 160 degree thermo.

88BlackZ-51

iTrader: (2)

Yes I have the stock intake/head/cam from the general. I dont know what your point is? Its fact that the C4 TPI are quicker then the 4th gen F-body's in stock trim or mod for mod. My car ran 14.21 with no mods.

Hard to get a cam smaller then the stock cam dude.
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Are you happy if you get a 13.7? Will you break into the triple digit MPH?

Orr89RocZ

iTrader: (20)

i been 13.79 at almost 97mph in hot summer night (80deg) on 26inch et streets 3.27 gears in the old 9 bolt rear. 1.80 60 foot. stock L98 with full exhaust and lots of suspension work. 2800 stall. its seen 100mph traps in the cold on street tires

been 1.79 60 foot with EST wire dissconnected and breakin the posi spyder gears on launch.... that would have been a bottom 13.7x or possible 13.6's

no times with new 3.42 10 bolt rear end

B Rhodes

The only official time I have is from right when I bought the car 91 350 tpi/T700, stock exhaust manifolds(dual cats) Flowmaster cat back,hypertech chip 160 tstat, underdrive pullies,AFPR, most free mods. It Ran a best of 14.4xx at 97.2

Giovannetti

I ran a 8.1 with a 1.687 60' with only 310 RWHP. ALL STOCK except the nitrous whih I only sprayed about a 70 shot according to dyno but according to pill setting it was a 150???????????? Of course I had the drag radials too. I launched the nitrous from the dig and stalled up my STOCK converter as much as I could and man was it fast.

speed88

My best run with the old TPI'ed L98 was a 14.3 @ 98mph. Mods at the time included descreened MAF, airfoil, ported plenum (IAC walls shaved), K&N filter, freshened stock L98 heads (hottanked, new oil stems, etc.), edelbrock shorty headers and y-pipe, no cat, flowmaster 80 series.

That was back in the summer of 02 or 03, can't quite remember??? Now I've gone to hell with it! Refer to sig!

1991CamaroRslow

iTrader: (3)

88BlackZ-51 I hope it's just me but that post souded pretty hostile? 1987's came with a smaller cam than all the other years of Chevy TPI's and the Camaro's came with a smaller cam than the vette. Also NONE of my post was directed towards you except for the question about if you drove a vette or were talking about a third gen. No one on this board's being hostile to you. I was making a point that it's fully possible to get mid 13's from a bolt on TPI as long as the combination's set up right. As for breaking into the triple digits, It'll probably break 100 considering it's doing 98 now. I've broken into the triple digits quite well considering my 12.5 and 6 nitrous runs are in the 110mph range. The goal this time out is actually to break a 13.5 on motor, then to run an 11 second nitrous pass and drive the car home. I'm ready to attept it considering I'll have all winter to fix it if something crazy happens. This motor is OLD so it really owes me nothing now. It's done more than i ever expected it to, I paid 350 dollars for it from a junk yard, transplanted it into my RS and have drove and raced it every summer for the last 3 years. This engine has made me one firm believer in the power and reliability of the TPI.

BigWhiteGTP

Not entirely true. Any year, every L98 got the same cam. Although rumours abound that the 1989 L98 had a slightly meatier cam than the other years before the 1990 switch to speed density.

Ackattack

15.918@84.57

Stock internal TPI with headers/flowmaster/CAI/AFPR/airfoil with 3.73s on 28" street tires.....in a ~4200lb truck. I spun bad that run pulling a 2.4x 60' time. The next run I did a better burnout and got traction, but got wheel hop instead and broke a u-joint

I'll be back to the track in 2 years with my new combo.....looking to skip the 14s and 13s and head straight for the 12s

1989GTATransAm

iTrader: (3)

Looks like Greg is the winner so far with a 12.47@110.31. 2nd is a 12.71@107.65. These are NA cars. We'll see what the first of the year brings. Hehehehe.

88BlackZ-51

iTrader: (2)

awesome!! my goal is to get 13.49 or below on the stock head/cam/intake that the old general installed in 1987.

btw, i doubt there is much diff between an 87 L-98 cam from an 88 L-98 whether it be a camaro or a vette. there both really, really weak.





goodluck!
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greg is the winner? i thought u went stock TPI? oh well, 110mph is movin.

Giovannetti

Well according to my 1/8th mile time slip and my 60' I pulled and trap speed I should be close to second place

1991CamaroRslow

iTrader: (3)

Directly from this site https://www.thirdgen.org/tech-data 1987 had a different cam than the other years, you can read it right there. It's not like I make this up to sound cool, I also agree all of the stock roller cams are weak. I got my lower intake off tonight, will be posting pics of it compared to the pics I just posted of my ported intake. This is off topic so I'll try and keep it on, I hope to shave 2 tenths with the ported lower.

MdFormula350

60 foot 1.746, 1/8 8.498 at 79.09 mph, 1/4 13.449 at 101.86 mph

Stock 350 tpi speed density engine, just headers and open exhaust, major things are suspension and chip tuning.

canadian250

'85 T/A with completely stock LB9/700R4/3:27 powertrain. Addons: Edelbrock shorties and Y, adjustable regulator @ 49psi, MSD 6AL, airfoil, 1.6 stamped steel rockers, 10* advance timing, Hypertech stage3 chip, empty cat, 160* thermostat, NOS 140hp tpi system.

1/4- 14.91 @ 91.93mph with 2.20 60' on motor, and 13.55 @ 102.93mph with 2.19 60' on the 140hp nitrous

Not fast by any means, but not to bad for a basically stock '85TransAm running the original Goodyear gaterbacks

Demon355

iTrader: (1)

I'm watching this thread closely to see if anyone puts down their numbers that matches the mods I have. Anyone dial in what I'd run? My mods list doesn't contain a converter but just for the record, it's a 2800 stall.

I'll be swapping my 10 bolt 3.23's out next year for a '95 Z28 10 bolt with mods out the yingyang including some 3.73's. How will these effect my 1/4, '60, 1/8 etc.

Hawk92z-TDZ

Stock 305 TPI cams for 1985 to 1992. **Note the 350 TPI uses the 305 Manual Trany cams.

1985 Flat Tappet #14088843
Int/Exh 202/206 Lift .403/.415
1986 Flat Tappet #14094097
Int/Exh 178/194 Lift .350/.385
1987 Roller #14093643 Manual Trany
Int/Exh 202/207 Lift .404/.415
1987 Roller #14093640 LM1 Police Pack
Int/Exh 191/202 Lift .383/.404
1987-92 Roller #10088155 Auto Trany
Int/Exh 179/194 Lift .350/.384
1988-89 Roller #10066049 Manual Trany
Int/Exh 207/213 Lift .415/.430
1990-92 Roller #10111773 Manual Trany
Int/Exh 202/207 Lift .413/.428

Hawk vs Viper
9:1 compression, 3:42 gears, no tunning, had to 2 foot it to idle

BigWhiteGTP

Well, then my car is a freak and so are the other guys that went to swap cams and pulled out L98 cams of their 90-92 auto/lb9 cars. Also, our dynos and track times are whacked as well. It's a GM conspiracy, they've gotten to all tracks and dynoshops to mess with us.


Truth is, that info is wrong and so are some of the tech articles. The only way to know for sure is dyno, track, and degreeing cams. All of which have proven beyond a shadow of a doubt that ALL SD TPI cars got the L98 cam.

Hawk92z-TDZ

I have heard that before, I cant say either way myself, nor do I trully care, the part numbers and info came straight from a GM tech, take it or leave it, no need to be rude about it


or try google, lol

nelapse

iTrader: (17)

That stuff belongs in it's own thread. Not in mine. I am not trying to be a jerk but I do not want my thread locked. Please take your conflict elsewhere.