Subject says it all. I don't understand why the hell my Formula is so slow! (14.8@93 mph.) I have all the mods listed in my sig (headers, exhaust, removed cats, CAI, full Accel ignition, TB bypass) and my car is still running slower times than many of your STOCK thirdgens run. I can't understand why I've put around $800-$900 and my car is running slower than many of you are STOCK.

RRL98

 

Do you set any codes (check engine light)??? How old are the spark plugs etc?? could be valve springs???? Is your torque converter working????? how many miles does the car have???? do you know how to drive???? timing??? it could be one big thing or a combination of 30!

 

So far you have let the engine breath out but not
much about breathing in. Remember that we already have
a handicap since we run with a system designed for a 305.
Heres a few things I'd try next.
If you haven't already done so port your plenum. Take that casting bump out that is right in front. It will have the affect of putting on a bigger throttle body.
Replace or at least test your injectors and get an afpr to bump up your fuel pressure.
If your going over 5000 rpm in 2nd get a corvette servo installed and it should complete the shift sooner to get you back where ltr setup makes its power.

 

Dude dont feel bad at all I ran the identical times with my 89 Formula 350. Heres what helps. I started off going 14.7 with a catback MSD6al , accel supercoil, full tuneup, LCA's, airfoil, Pulleys and a mighty K&N. I got pissed came home and threw headers on it and a highflow cat. I went back 14.7. I was fumin. I then went back to the track with the tb bypass and a shiftkit and timing at 8*. I went 14.5. I cam into the pits and the car threw a code and then the light went off. I disconnected my battery and when i was in the staging lanes i reconnected the battery and ran the car about a minute before stagining., I dont know what it was weather the car was relarning itself with fuel and spark but anyways i pulled off a 14.2. Still upset i came home put a edelbrock base on and as&m runners and a new maf. (old one was bad) this time I managed a 14 flat at 99 with the stock chip still. I said I'm done with bolt ones this winter new heads and a big cam is going in.

 

My car ran a best time of 16.5 @ 84 mph so don't feel bad.

 

Its a MAF car ..the slower of the two TPI setups. The best i have seen a stock 36K mile MAF car pull off was a 14.46@94mph. Who knows...without timeslips we cant help much. did you have bad 60's? maybe 2nd gear spun a little? i dunno and only you do. I wouldnt say your car is slow but you need to tune it instead of throw parts on it and hope it will go faster.





91 Z28 L98 - flowmaster muffler, tb coolant bypass,ram air induction, PR chip, bald Yokohama A540's 13.78@99.8mph SOLD

92 RS - driver

 

Well, you should do a cylinder leak-down test. I would also point to your transmission.

 

ITS THE WHOLE COMBINATION I AM SORRY TO SAY IVE BEEN RACEING THESE THINGS FOR ABOUT SIX YEARS I STARTED OUT IN THE 14S AND NOW I AM IN THE MID 11S HOPEFULLY NEXT YEAR HIGH 10S THIS IS IN 85 L98 VETTE I ALSO HAVE 85 IROC BUT HERE ARE SOME OF THE MODS FOR THE VETTE EARLY ON IT WAS A STICK CAR STOCK IT WENT LIKE 14:2 STOCK IT HAD GUTTED MAF
GUTTED CAT,PULLYS AND AIR FILTER K AND N AND 93,000 MILES ON IT THEN THE CHANGE HERE GOS CHANGED TO A ULTRADYNE CAM A MILD 272-280 CAM AND A SET OF 195 AFR HEADS THAT WERE ON MY OLD 10 SEC CAMARO I WAS THINKING HIGH 12S EASY RIGHT YEA RIGHT TRY 13:6 I WAS SHOCKED TO PUT IT MILDLY I THEN DID SOME HEAVY RESEARCH AND FOUND OUT THE REASON IT IS CALLED TUNED PORT IS EVERY THING IS TUNED THE SAME FROM THE AIR CLEANER TO THE THROTLE BODY TO THE UPPER PLENIM TO THE MANIFOLD BASE TO THE HEADS AND HEADERS ALSO I THEN CHANGED THE NEXT BIGGEST RESTRICTION WHICH I THOUGHT WAS THE INTAKE SO I CHAGED TO A SUPER RAM COMPLETE WITH BASE AND 58MM T BODY AND GOT REWARDED WIT A 12:7 ET NOT TOO SHABBY DO I THINK THE INTAKE IS WORTH 1 SECOND NO NO NO IT IS THE WHOLE COMBO OF PARTS WITH OUT THE OTHER IT WIL NOT RUN WITH JUST 1 OR 2 MAJOR MODS ON THIS SETUP I NEXT CHANGED TO A TPIS RAM AIR AIR CLEANER HOUSING AND PICKED UP ANOTHER 2 TENTHS TO A BEST 350 CI OF 12:5 ET THROUGH THE PIPES ON STREET TIRES AND 307 GEARS

PS BY THE WAY IT IS STILL A MAF CAR FOR THE GUY ABOVE .MAF CARS TAKE TO CHANGING PARTS BETTER THAN SPEED DENSITY AND IT STILL HAD STOCK COMP CHIP ANY QUES
EMAIL; ME CORKY@TRMICRO.COM

 

I completely with Corvette1 - you have to think of the intake, heads and cam as a "complete unit" and match them accordingly. Changing any of the other parts (ie. cam and heads) and leaving the intake will choke the engine. You can get some gains with the intake alone, but the heads and cam are also closely matched so they still remain a limitation. That's why a Miniram on an otherwise stock L98 doesn't have the gains it should.

Corvette, pity you didn't look into eprom burning. I think you'd have gotten even more performance. There is a limit in how much MAF will self compensate (i.e. larger motors or high revvers can max the MAF at 255 gm/sec). And if you put different injectors on it will throw the calibration off even for MAF unless you modify the eprom accordingly. But the biggest reason a MAF user should consider burning their eprom would be to optimize the spark curve. That is where I think you could have found even more power.

Road Rocket, why don't you look at eprom burning also? I wish I had gotten into eprom burning a lot earlier with my car. I had a build up plan where I was going to change my intake, heads and cam (so they'd all match) but I realized I would also need an eprom to make it work optimally. So, while I was saving my money for my mods, I learnt how to burn eproms in the meantime. I now have all the parts and I will be changing them in the spring.

On my basically stock L98 I defintiely got a performance increase (mostly by fine tuning the fuel tables and optimizing my spark advance to give me the most advance the stock GM heads could handle without causing detonation).

Learning on a basically stock engine is the simplest place to learn because if you screw up (and we all do at one point or another as we are learning), I always could go back to my stock eprom as a back up. Now, I am completely confident in being able to tune my eprom for the build I am planning and I know that it will be better than any custom eprom I could buy and get the maximum peformance out of my modifications.

One side benefit, in learning to burn an eprom for more performance you will also learn how to increase its gas mileage. The savings in gas alone has paid for all of my equipment (and it was actually cheaper than buying a custom eprom).

 

Heh heh, because its not a Camaro!! J/k. I do hope that your car will run the way u want it to sometime. I know from seeing your previous posts its hasn't been as fast as it should be and u were even looking into other cars because of whatever is making it this way.