need help on my car for tunning
Thread Starter
TECH Enthusiast
iTrader: (7)
Joined: Feb 2011
Posts: 562
Likes: 0
From: frederick, Maryland
need help on my car for tunning 2003 Z06
Vararam intake.
fast 90 mm hand ported by myself
ls2 tb stock maf
dyntech long tubes with high flow cats stock mufflers
Monster stage 3 with light weight fly wheel
I have been to the track and it ran 11.84 at 115. 50 with a 1.644 60ft stock front rims with 17x11 rears with mt et streets.
When the car was bone stock and went 12.30 at 115.80 on a 3200 launch because of a going clutch.
My air fuel is 13.0 to 13.4 in 2nd and 3rd and 12.2ish in 4th and im running 23degrees of timing. Why is my car so far off from what it should be at the track. I should be trapping 123 almost
Vararam intake.
fast 90 mm hand ported by myself
ls2 tb stock maf
dyntech long tubes with high flow cats stock mufflers
Monster stage 3 with light weight fly wheel
I have been to the track and it ran 11.84 at 115. 50 with a 1.644 60ft stock front rims with 17x11 rears with mt et streets.
When the car was bone stock and went 12.30 at 115.80 on a 3200 launch because of a going clutch.
My air fuel is 13.0 to 13.4 in 2nd and 3rd and 12.2ish in 4th and im running 23degrees of timing. Why is my car so far off from what it should be at the track. I should be trapping 123 almost
Thread Starter
TECH Enthusiast
iTrader: (7)
Joined: Feb 2011
Posts: 562
Likes: 0
From: frederick, Maryland
ok. i just have the wideband guage setup but ill work on this week getting it hooked up to the computer so i can get logs with afr on the computer to post for people
Thread Starter
TECH Enthusiast
iTrader: (7)
Joined: Feb 2011
Posts: 562
Likes: 0
From: frederick, Maryland
they had some pretty burned up acdelco's and swapped out for ngk tr5 about 2 weeks ago with about 200 miles on them. the car was on the dyno but only had the fast intake, vararam, and light weight clutch. mind you this dyno read about 20 high
the idiots went by mph so where there is a little hickup in the middle at 90 mph is about 4500 and the limiter was stock at 6500 to give you an idea of the rpms and power it was making
the idiots went by mph so where there is a little hickup in the middle at 90 mph is about 4500 and the limiter was stock at 6500 to give you an idea of the rpms and power it was making
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
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
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
on the adventure park tune, You have the COT over temp enabled so when your cats get hot, your tune is set up to add 1.25 more fuel. if you disable that, Id still make the final WOT fuel ratio a little richer for your overall AFR at WOT in the mid 12s
Thread Starter
TECH Enthusiast
iTrader: (7)
Joined: Feb 2011
Posts: 562
Likes: 0
From: frederick, Maryland
Thread Starter
TECH Enthusiast
iTrader: (7)
Joined: Feb 2011
Posts: 562
Likes: 0
From: frederick, Maryland
How does the computer no this? Out of curiosity. Cause it doesn't have the rear 02 hoked up.
your sensors are reading your exhaust temperture thresholds and will add fuel depending on the tempertures to protect your cats from overheating.
in your HP tuners go to engine/fuel/ COT lean cruise/ COT CAT overtemp protection/ Click it to disable
in your HP tuners go to engine/fuel/ COT lean cruise/ COT CAT overtemp protection/ Click it to disable
Thread Starter
TECH Enthusiast
iTrader: (7)
Joined: Feb 2011
Posts: 562
Likes: 0
From: frederick, Maryland
oh ok thanks for explaining it. ill have bad6as make some changes and try it out sometime this week along with getting the aem uego hooked up and make some logs with afr to post up for you guys
Just out of curiosity, who told you a bolt-on Z @ nearly 3300lbs should be trapping 123? I'd say you're in a pretty good spot. Get yourself a solid 420~430rwhp and you might hit that trap speed.
As for the tune, looks like you found the COT. That, BTW, is calculated by the PCM based on load and RPM - not measured by the O2s. I'd target a 12.7-12.8 AFR, which gives you a little margin of safety. Optimal timing is really found on a dyno. Start with the stock timing map and add a little to it at a time to see where it stops making power without triggering knock retard (be careful around peak torque). You can try to do it at the strip, too. But, understand variances in your run (60' times, shifting, etc.) might make the slight differences in timing hard to determine if they're truly beneficial. For safety, I wouldn't make too much of a change to the lower RPM stuff. After all, the shift from 1st to 2nd, 2nd to 3rd, etc. probably won't drop you below 4,500 RPM.
As for the tune, looks like you found the COT. That, BTW, is calculated by the PCM based on load and RPM - not measured by the O2s. I'd target a 12.7-12.8 AFR, which gives you a little margin of safety. Optimal timing is really found on a dyno. Start with the stock timing map and add a little to it at a time to see where it stops making power without triggering knock retard (be careful around peak torque). You can try to do it at the strip, too. But, understand variances in your run (60' times, shifting, etc.) might make the slight differences in timing hard to determine if they're truly beneficial. For safety, I wouldn't make too much of a change to the lower RPM stuff. After all, the shift from 1st to 2nd, 2nd to 3rd, etc. probably won't drop you below 4,500 RPM.
Thread Starter
TECH Enthusiast
iTrader: (7)
Joined: Feb 2011
Posts: 562
Likes: 0
From: frederick, Maryland
1--10.890@125.06--1.465--GARY2004Z06--'04 12/08-VR, DRs, ARH LTs, Tex Exo-Skel, 4.10s, Post #356
2--11.175@121.07--1.610--94z28racecar---'03 12/09-VR CAI, LTs, UDP, Mcleod Twin, DRs, Post #463
3--11.214@122.30--1.580---Dr Ron---------'03 11/05-VR CAI, ET St, LT, ClutchSlip
4--11.25x@123.7x--1.58x---Butcher--------'03 10/04-Bolt Ons, 3.90 gear
5--11.329@121.72--1.606--Stevo92z28-----'02 03/10-LTs, Blackwing, ET Streets, Skinnies Post #500
but i have more mods so really i should be trapping 123-126 on a good day.
2--11.175@121.07--1.610--94z28racecar---'03 12/09-VR CAI, LTs, UDP, Mcleod Twin, DRs, Post #463
3--11.214@122.30--1.580---Dr Ron---------'03 11/05-VR CAI, ET St, LT, ClutchSlip
4--11.25x@123.7x--1.58x---Butcher--------'03 10/04-Bolt Ons, 3.90 gear
5--11.329@121.72--1.606--Stevo92z28-----'02 03/10-LTs, Blackwing, ET Streets, Skinnies Post #500
but i have more mods so really i should be trapping 123-126 on a good day.
Thread Starter
TECH Enthusiast
iTrader: (7)
Joined: Feb 2011
Posts: 562
Likes: 0
From: frederick, Maryland
I have been doing logs with a widebandd but I haven't hooked it up so that the laptop can record the afraid. Im out in the car right now and made some pulls. It is now leaner at the top of gears so making adjustments to that but what's weird is the car is now as quiet as stock???? Wtf?!!!!
