vett leaving too soft...
Thread Starter
Racer
Joined: Aug 2001
Posts: 355
Likes: 1
From: JACKSON MS
vett leaving too soft...
i have a 93 auto with ported heads(3 angle valve job) , longtube headers(1 5/8) , lt4 hot cam, 1.6rr, lt4 springs, msd distributor, coil,and wires, 2800 stall, 3.75 gears, and a tune frm pcm for less. I took my car to the track last weekend and was shocked at how slow my car was. This was the timeslip.
60ft 1.94
330ft 5.49
ET. 8.08
mph 86.5
I think the problem is my 60ft time its way slower than wat i think it should be. I have a 2800 stall but my car will only stall to 2100. You guys have any idea as to how I could get my 60ft down?
60ft 1.94
330ft 5.49
ET. 8.08
mph 86.5
I think the problem is my 60ft time its way slower than wat i think it should be. I have a 2800 stall but my car will only stall to 2100. You guys have any idea as to how I could get my 60ft down?
Last edited by ICANTDR55; Jul 27, 2010 at 02:21 AM. Reason: added info
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 7
From: Tampa Florida
1.9 isn't bad on street tires....might be time for some slicks.
Your ET isn't bad but IMO your MPH seems a little slow/low for the 1/8.....wheel spin?
Stall ratings are not always "exact"....your sure your RPM gauge is accurate?
You might try stalling the convert up at the line just before you launch it vs just punching it - to see what works best.
Your ET isn't bad but IMO your MPH seems a little slow/low for the 1/8.....wheel spin?
Stall ratings are not always "exact"....your sure your RPM gauge is accurate?
You might try stalling the convert up at the line just before you launch it vs just punching it - to see what works best.
Le Mans Master
Joined: Jan 2006
Posts: 6,564
Likes: 6
From: Woodstock Georgia
Get a set of good drag radials on it and it will make a huge difference. I have run both the BFG and Nitto street legal DRs, both worked great at the track and safe on the street.
Don't expect them to last long if you use them as your daily driver tires, otherwise they will really help at the track.
Don't expect them to last long if you use them as your daily driver tires, otherwise they will really help at the track.
Race Director
Joined: Apr 2003
Posts: 17,697
Likes: 1,666
From: moraga ca
If you are not spinning your tires, drag radials won't help. For some reason, you are down on power. Your gearing sounds ok as well as your engine combination. My car can only be footbraked at 2200 rpm as well because the Corvette disks don't hold very well on the line. I would put the car on a dyno and make sure the afr and timing are where they need to be. Maybe if you can datalog a couple of runs, you will find your answer.
Thread Starter
Racer
Joined: Aug 2001
Posts: 355
Likes: 1
From: JACKSON MS
If you are not spinning your tires, drag radials won't help. For some reason, you are down on power. Your gearing sounds ok as well as your engine combination. My car can only be footbraked at 2200 rpm as well because the Corvette disks don't hold very well on the line. I would put the car on a dyno and make sure the afr and timing are where they need to be. Maybe if you can datalog a couple of runs, you will find your answer.
Last edited by ICANTDR55; Jul 27, 2010 at 02:17 AM. Reason: added info
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 7
From: Tampa Florida
Well as far as the braking problem wat should i do? And my car does seem to be down on power because it can't even pull to 6500 rpm . Pcm for less sent me a chip for my exact setup so i don't think my timing is off and I put my car on a diagnostic computer and the only problem i saw was my blm was 161 instead of 128 where it should be and i have a bad valve stem seal on my #6 cylinder. How badly do you think its affecting my car?
would double check your actual A/F ratio as others mentioned.
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Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 7
From: Tampa Florida
Drifting
Joined: Apr 2008
Posts: 1,815
Likes: 10
From: New York New York
Thread Starter
Racer
Joined: Aug 2001
Posts: 355
Likes: 1
From: JACKSON MS
what has me confused is that my diagnostic computer says my car is runnin lean according to the block learn module but my 02 sensors are sayin my car is runnin rich and when i put my foot in it i see black smoke out the exhaust. Im lost.
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 7
From: Tampa Florida
Your going to want to do some data logging to see what's going on at various throttle positons/rpms and have your tuner make adjustments. Dyno run(s) will tell you what the A/F ratio is WOT but that is about it.
IMO 60' times aside - your MPH should be much closer to 90 and running upper 7.XX with that setup.
Safety Car
Joined: Dec 2007
Posts: 3,616
Likes: 5
From: Sandhills of North Carolina
I know you said you have 1 5/8 LT's. What kind of exhaust system do you have after the headers?
Mail order tunes are an improvement for sure but what works for one car might not work for another one. They all need to be tweaked to get the max out of the car they are in.
Get on the foot brake at the line and load it up as much as you can. Also as mentioned some drag radials will help get that 60' down some. I'd say you should be at 89 mph and 1.8 or a little less with your mods.
What kind of weather were you running in? It's very humid in MS.
Using your 1/8 et and mph this is what a online calculator says your 1/4 should be.
Your 1/4 Mile ET is 12.67 seconds computed from your vehicle 1/8th ET of 8.08 seconds.
Your 1/4 Mile MPH is 107.26 MPH computed from your vehicle 1/8th MPH of 86.5 MPH.
Mail order tunes are an improvement for sure but what works for one car might not work for another one. They all need to be tweaked to get the max out of the car they are in.
Get on the foot brake at the line and load it up as much as you can. Also as mentioned some drag radials will help get that 60' down some. I'd say you should be at 89 mph and 1.8 or a little less with your mods.
What kind of weather were you running in? It's very humid in MS.
Using your 1/8 et and mph this is what a online calculator says your 1/4 should be.
Your 1/4 Mile ET is 12.67 seconds computed from your vehicle 1/8th ET of 8.08 seconds.
Your 1/4 Mile MPH is 107.26 MPH computed from your vehicle 1/8th MPH of 86.5 MPH.
Last edited by Weav's Vet; Jul 28, 2010 at 04:28 PM.