Please!!! I recently run my car on the strip for the 1st time ever and just wanted to ask if my times are correct for my setup. Even though I know I could improve my launch, it still seems like my car is extremely slow for its mods. My best time was 14.96 sec @90.50mph with a 2.194 60'. All my mods are in my sig. The cam specs are 204/214@.050" gross lift .423"/.446", base timing was set at 8 deg, and fuel press 46 psi. Any suggestions of possible problems or comparisions would be greatly appreciated.

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GM Line & Driveability Technician
ASE Master Technician
ASE L1 & XI Certified

87 IROC-Z
4 bolt main 350, Crane 122 Compucam, Edelbrock headers, Dynomax Cat-back, Crane F.P.regulator, 52mm TPIS T.B., modified MAF, AS&M custom PROM, ported plenum, K&N filter, T56, Star clutch, ARE protorque starter, 9-bolt
3.70 gears,Spohn adjustable torque arm & T56 crossmember

 

using the stock heads and intake setup the cam isn't gonna do much for you.my assumption is most of your gains are attributed to the larger gears.the intake can barely feed a stock 350when you add a cam your asking the engine to breathe deeper and the best analogy i've heard was it's like trying to run a marathon breathing through a straw.i'd port the base or att least extrude hone them and get a good converter with 500-750 rpm stall over the stock unit the otherthinngis the gears youare probably going through the lights at around the 4800-5000rpm area again asking the engine to make power where it cant.

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87 trans am,gm crate 350(4 bolt mains 10to1),L98 aluminum heads,LT4 hot cam,slp runners,slp 1 5/8 headers,3in.y-pipe,edelbrock base,hi flo cat,air foil,afpr,as&m ported plenum,gutted airbox,t-5 tranny w/centerforce clutch and a 3.27 9bolt(11.9in. brakes),ed wright's fastchip,relocated iat sensor,160 fan switch&t-stat,tb bypass,accel supercoil,cap& rotor,slp 3in. catbcak,a/c delete.

car has found a new home
she will be relocating soon,thanx to all that were interested and the few who had purchased some of the many,many extra parts i had accumulated over the years.

best e/t:
3653lbs./full tank+ driver.
14.10@96.53mph 2.01 60'

 

First off...his sig says he has a MANUAL trans...no converter in a stick (duh). Regardless of what was said above...you should be running quicker. What was your MPH? MPH is a better indicator of the HP you are making.

What RPM did you launch at?
What RPM did you shift at?
What elevation is the track at?
What was the temperature when you ran?

All those items will contribute to your ET.

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Mike Metzler (Desert86Roc)[*] Check Out:SpeedWorldMotorplex.com[*] Check Out:Chevrolet F-Body Online Part & Illustration Manual[*] My 86 IROC 305 TPI Page (406 build in progress)

ET's @ 1250 ft[*] 14.28 @ 95.461 mph (uncorrected, NOS, no headers)[*] 15.362 @ 88.238 mph (uncorrected, headers, no NOS)
<><

[This message has been edited by Desert86Roc (edited September 26, 2001).]

 

Im not trying to knock ya but that cam seems pretty small for a 350. I have a bigger one in my 305. Id definately port your intake base and heads too.

 

same thing about the cam, the cam in my 305 is a 206/212 with 480/487 which seems wilder than your cam in a 350. eitherways, your mph is way low for what you should be doing. might want to make sure nothing is broken under the hood. seems way to slow for your setup. ps, change the wimpy cam and run some low 14's easy.

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91 Z28, 305 TPI, SLP cam & runners, 3.73 gears, Hedman headers, BBK 58mm TB, k&N, tach, speedo, Hurst short shifter, NICE stereo, alarm w/ window module, MSD 6A, HP Alt., Ported WORLD Heads, Ported and Port Matched Intake Manifold. 99 C5 Rims 17"s in front 18"s out back
EAT, SLEEP, BREATH CHEVY

 

Hey, jaycee, what's up? When we going to Heartland Park again?

Hehe, he forgot to mention that the times mentioned were his first times at the track in this car. From what i saw, he just needs to work on launching and shifting better, and he'll definately improve. And a cam change wouldn't hurt either

 

You should definately be running faster than that.
My old LG4 with Edelbrock carb and intake ran a 14.94 @ 91.67mph.
130K miles on the motor and a slipping clutch.





[This message has been edited by Zepher (edited September 27, 2001).]

 

My cam is really small too and I went 14.00 with stock heads. That car really should be faster than that.

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1991 Firebird
350 L98 (was a 305 TBI),T-5,Edelbrock TES and cat back,Accel manifold
NOS,subframes,jegster torque arm,MSD Digital 6
AFPR,Lakewood lcas
Hurst linelock,SLP cam (206 212 .480 .486),relocated battery,cold air,Hypertech chip,centerforce df,clutch
poly bushings and mounts
AFR 190s
Harland sharp 1.5 rockers
autopower rollbar

12.33 @ 114.83 juiced uncorrected

13.510 @ 102 non juiced uncorrected

 

Thanks for the responses. To answer a few questions my trap speed was 90.50mph(it was in the post),track elevation around 1600ft, track temp around 80F, I was having the best luck by reving the engine to 2500rpm, dumping the clutch, and flooring it shifting at 5000rpm(no power past that). Everyone I have talked to agrees that my ETs and trap speed was way slow! I know my cam is basically stock,(when I built the engine it was just my daily driver, since become show car/street cruiser)but I am still looking for possible problems. I have no driveability problems, but I do notice that the engine runs rough(smells rich and the idle hunts like it has a big cam) at idle. I used to think that it was a result of my off highway AS&M PROM, but have since plugged in a Hypertech 305 PROM for comparison and it still runs the same way. The engine also has extended crank time intermittently. I am wondering if I could have a leaking fuel injector(s)? Also the car used to be 305TPI/auto. I changed the injectors and PROM with 350 units, but was wondering if any of the other sensors were different?

------------------
GM Line & Driveability Technician
ASE Master Technician
ASE L1 & XI Certified

87 IROC-Z
4 bolt main 350, Crane 122 Compucam, Edelbrock headers, Dynomax Cat-back, Crane F.P.regulator, 52mm TPIS T.B., modified MAF, AS&M custom PROM, ported plenum, K&N filter, T56, Star clutch, ARE protorque starter, 9-bolt
3.70 gears,Spohn adjustable torque arm & T56 crossmember

 

Knock sensor is different. Also, what fuel pressure are you running?

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1990 IROC 350
Mods: Too busy trying to make it run right to mod it.
Airfoil, Dynomax cat-back, MSD coil, 180 t-stat, Bald Eagle tires,
Hypertech fan switch, Accel 23# injectors, Holley module, ported plenum,
Ported Daytona Yellow stock base, Moroso valve covers, other stuff,
Streetdampr, Ruger P95DC, hot wife, new oil filter, !cats, !TBC, !AIR.
18.0 @ 85MPH since I'm one big-a$$ MF
"It's better to have and not need than to need and not have."

 

I had heard that the knock sensors were different. GM shows two different part numbers. Is the 5.7L sensor less sensitive? I am planning on changing, but did make my last pass on the strip with it unhooked. I didn't notice any difference in ET or mph. My fuel pressure was in my first post, 46psi at idle or 51psi with the vacuum line disconnected.

 

I thought fuel pressure was usually set at 43.5 without the vac link attached?

Anyways, it is best to set the fuel pressure with a scanner and look at your BLM (Block Learn). I adjusted mine until I had a BLM or around 128-ish. I am running 19lb/hr injectors on a 350, so I ended up with 55PSI for fuel pressure.

Your times do seem slow, rather you MPH seems slow. I would have expected 92-95MPH from a 350 car. Perhaps the CHIP is not what is was suppose to be. You should try to run with your stock prom and see how it goes. Your cam is not that wild, that a stock prom can't run it. I run a stock 1987 350 prom with my ZZ3 cam. Runs quite well. Yes, I know a custom prom is the way to go, soon ...

Mark.

 

I don't think you have enough engine to see much of a benefit with the 3.70's.

 

I agree you should be running better. The knock sensor could be the problem. But your problem sounds like mine, how it doesn't pull past 5000RPM... Trying to figure out what the problem is... I will post it when I figure it out.

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1988 Pontiac Trans Am GTA L98 5.7L, Black on Black with 113,000kms

 

Get someone who knows how to drive to do some pases-if MPH is low and ETs are not good then you know there is a problem. Remember guys he is running at a high elevation which slows the car down.
Stock heads,stock runners and stock base need to go. If on a budget I like the aluminum L98s but guys here like the Vortecs-its your call..
Try some more fuel and ditch the prom. After ditching the prom add some more timing and see what happens. I like your shift points see keep them there.
The best proms are those cut while the car is on the dyno.
Good luck-you have the stuff to go fast.

 

hey man not to burst your bubble or anything. but that is not the right cam for a 350.. i have that cam in a 305 TPI and with 2.73 gears i am hitting a 15.1 and my car pulls to 5000 rpm and pulls 2.16 60's and i dont break 90 mph..... and i only got 193. hp at the wheels.. but what i say is u need a better cam..

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305, TPI,compucam 2030 cam, air foil, 8.8 wires, accel super coil, dynomax headers, custom y-pipe, cut out, 80 series flowmaster, 2.73's and an open diff(3.42-3.73 on the way). and a stage 4 chip :0). hittin a sad 15.2 before the chip.

 

I agree with everybody else that the cam you'
re running is DEFINETLY too small! That cam is barely bigger then a stock L98 cam! With an upgraded 350 TPI engine your duration should be at least 220 on the intake side about 230 or so on the exhaust. Lift numbers should be close to 0.500 if not a little over. I would set the fuel pressure around 48psi also for better fuel atomization.

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1991 Z28

 

Alright, that engine is coming apart! Going slow sucks!!!
Although I have seen bone stock cammed L98s run low 14s.

 

LT4 Hot Cam-it, get some better heads while it is apart, and watch the low 13 time slips start flowin' (With a good 60' of course)

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1987 GTA L98 MD8
355, TFS Heads, LT4 Hot Cam
My GTA

The Minnesota F-body Club

 

I was runnign 13.9s on 305 heads on a 350

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89 Trans Am Turbo 3.8L All stock 43,000 miles #1053 of 1555

Past Thirdgen:
86 Trans Am w/ built 355TPI with SLP goodies and too much other stuff to List. One sweet *** car, wish I would have had a good enough Job to pay insurance on three cars so I could keep it, but for a 89 Turbo Trans Am w/ Low miles, I think I made the right choice!

 

When I put the 1.6 rockers on the vette it did the exact same thing... the whole car shook like crazy at a stoplight.I replaced them with 1.5 rollers and the car ran much better. There was a hp gain from the rollers and I got my low end back.
Which are you running? 1.5 or 1.6?

 

Thanks for the input guys. My car just has stock 1.5 stamped steel rockers. I'm getting ready to tear it down to check the injectors because the fuel rail loses pressure even with the supply and return lines pinched off. Hey, is the LT4 Hotcam actually that good? What kind of cam do you recommend for a 350TPI manual trans street/strip terror?

------------------
GM Line & Driveability Technician
ASE Master Technician
ASE L1 & XI Certified

87 IROC-Z
4 bolt main 350, Crane 122 Compucam, Edelbrock headers, Dynomax Cat-back, Crane F.P.regulator, 52mm TPIS T.B., modified MAF, AS&M custom PROM, ported plenum, K&N filter, T56, Star clutch, ARE protorque starter, 9-bolt
3.70 gears,Spohn adjustable torque arm & T56 crossmember

 

yeah- not Every l98, but I've heard stock l98's in the 13's too!

 

you might want to try checking the tps sensor voltage. that can make a huge difference in drivablity and performance. good luck with the cam swap.

 

You may want to have someone else drive that has had some long time experience behind the wheel of a shifter car to see if there is any difference.
This guy I raced with at Thunder Valley had a 97 Z28 6 speed. The best he was able to run before I talked with him was a 15.12 1/4. He was getting 2.30 60ft times. His car should have running low 14s. He let me drive to see if I could do any better. I ran a 14.51 with a 2.12 60ft. We found that he was taking too long between shifts & shifting too soon.(you may be shifting too late- after 5000RPM with TPI you are wasting time) -eating up the E.T. difference. -Just a thought.

 

Hey man.

You hit 3rd too early. I'm surprised noone picked up on that from your timeslip.

Your reaction time wasn't too bad. WHen the bottom yellow comes up, GO.. it will go green before you get out of the gates..

Looks like your 60 foot, and 330 foot was right in there. 2.1 60 foot is not too bad
for a street car.. I'm only getting 1.9/2.0's with street tires, breaking loose.

Your 6.1 330 foot is still only a 10th higher than getting a 14.2 in the 1/4 if you
go good.

But look at your 1/8th.. What happend there?? Shift early? get excited?
You tacked on an un-neccesary 4 10ths..
And that just killed you. I think your car
is good for a 14.4 or 14.5 easy, if not better. Keep at it.

-- Joe