Help with tuning for the track
Thread Starter
Staging Lane
Joined: Jan 2012
Posts: 75
Likes: 0
Help with tuning for the track I have a 2006 Chevy Impala SS 5.3. GXP springs, brakes, KYB GR-2 struts. nitto 555R 255/45/18 all around, K&N full filter system, Magnaflow cat back exhaust. custom tuned. Car makes 270HP/282TQ. The best time last year was 14.2@98mph. That was before the springs and brakes. Was losing some power between 1/8 mile and just before the timing lights. Found out there's a torque limiter in the computer. Turned that off. Fast forward. Went to the track this past Wednesday and out out of 5 runs, two blazed the tires at the line (2k rooms or a tad more), two chirped the tires, bog then a small spin then take off. (Between 15-1800rpms). The one clean run was at 2k and actually no wheel spin off the line. 14.5@96.9mph. All of this without traction control on. A stock SS goes 14.2@101, a stock GXP goes 14.3@98. I'm making more power and not even in the high 13s. What am I missing? Car is 4000lbs with me in it and a full tank of gas starting out.
Well that rules out my theory, only 90 feet above sea level.What are your 60 ft times?
Edit: How are you spinning so bad with drag radials? I'm in Ct, I have run at this track before quite a few years ago though. If you are getting our weather Wednesday was very humid, that wont help. Sounds like a tuning issue
Edit: How are you spinning so bad with drag radials? I'm in Ct, I have run at this track before quite a few years ago though. If you are getting our weather Wednesday was very humid, that wont help. Sounds like a tuning issue
Last edited by rottonj; Jul 24, 2015 at 08:16 PM.
I thought the R's were drag radials, sorry. Seems to be some time to be gained from better short times but times seem off a bit. I'm not a drag racer anymore so someone else should offer suggestions. Seems to have good power but it isn't being reflected in lower et's.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
you likely were dynoed with the converter unlocked which is why you think your making so much power, you hardly gained that much power from an intake and catback. Your trap speed is indicative of that. Buddy of mine with his stock GXP ran 14.4 @ 96 out in texas so your on par with what a stock 5.3 FWD would run. Best thing I can tell you is, dont run with a full take of gas, and roll into it off the line so that you dont spin, my buddy told me best way to do that is to say hippopotamus and by the time your done saying that word your foot should go from the top of the pedal to the floor. 2.1's are not bad 60 ft's for street tires IMO, if you can hold that consistently you should be happy. Also, heat and humidity will play a large factor in what you run as well. Expect better times in the fall and winter vs in the dead of the summer. I noticed a drastic increase in power just from running at night when its 70 degrees vs 90 degrees during the day.
The Impala should weigh a little less than the GXP I think. He is tuned with a decent catback and K+N intake. I would think it should be faster than this regardless of the dyno reading if done incorrectly. Something seems off to me.
Not really, dont judge so much by ET, look more at trap speed with these car's, ET is going to be an indication of how well you can drive (ie getting off the line). Trap speed is gonna be more of an indicator of how fast the car actually is. Given the fact that hes trapping close to what he trapped last year tells me that its probably just weather being the deciding factor here, or its possible his fuel trims or WOT fueling is a bit off. LTFT's can extend into WOT if they detect a lean condition prior to going into PE mode, which can result in an un-necessary rich condition at WOT. K&N intakes are worthless, dont go by their "dyno estimates", you may pick up a few horsepower at best from a K&N, and a catback is worth probably about 10 or so. Because catback's dont address the real problem with our exhaust systems, and that is in the headers/crossover, and the downpipe with the infamous "u-bend".
Yes, I get that. But his et isn't really reflective of what the car should do stock as it has been tested by many resources to be around 14.2 . Surely the mods he did should have gained him something, his car is going slower. Plenty of cars in the time slip posts here have run quicker with no mods. Something doesn't add up.
Yes, I get that. But his et isn't really reflective of what the car should do stock as it has been tested by many resources to be around 14.2 . Surely the mods he did should have gained him something, his car is going slower. Plenty of cars in the time slip posts here have run quicker with no mods. Something doesn't add up.
that's pretty much it, anything short of the world's stickiest drag radials, your always gonna have a slower ET then what you would expect, trap speed is gonna be an indicator of power. Look at the track time complication thread and you can see exactly where the power makers start adding to the trap speeds.
The bone stock guys running 2.0 60 ft's are running 14.1's @ 96mph, the guys with more serous exhaust and intake mods are trapping close to 100mph. Mainly the catless guys or guys with ZZP downpipes.
The bone stock guys running 2.0 60 ft's are running 14.1's @ 96mph, the guys with more serous exhaust and intake mods are trapping close to 100mph. Mainly the catless guys or guys with ZZP downpipes.
Thread Starter
Staging Lane
Joined: Jan 2012
Posts: 75
Likes: 0
When I first got the car 4 years ago, the car had just the Magnaflow system on it. (Lucky me it was still relatively new). I dynoed the car and it made 242hp 2450tq. After that I added the K&N full Ram kit with heat shield and then tuned it. After the tune it made 270hp and 282tq. All of these numbers are at the wheels and corrected numbers