Critique This Tune - C5 Corvette
Thread Starter
Staging Lane
Joined: Jan 2018
Posts: 57
Likes: 8
From: Ottawa, Ontario
Critique This Tune - C5 Corvette I am a tuner in training and have been tweaking the attached tune over a period of time. This has been mostly successful, and the car runs and drives ok (still occasionally tries to stall coming to a stop when partially warm but not a full operating temp, and will also occasionally try to stall aprox. 10 secs after a warm/hot start, but will catch itself and oscillate 2 or 3 times before settling into idle). By posting here I am hoping that the more experienced tuners here will provide helpful suggestions and critique the overall tune. Thanks in advance!
2000 Corvette M6, Vararam CAI, LT's, Corsa axle back, 228/232 600 612 +3 111 LSA (8 degrees overlap), 243 heads shaved about 0.004" to clean up, Cometic 0.040 head gasket, LS6 intake.
2000 Corvette M6, Vararam CAI, LT's, Corsa axle back, 228/232 600 612 +3 111 LSA (8 degrees overlap), 243 heads shaved about 0.004" to clean up, Cometic 0.040 head gasket, LS6 intake.
Thread Starter
Staging Lane
Joined: Jan 2018
Posts: 57
Likes: 8
From: Ottawa, Ontario
When I look at the log I see a B1 O2 that looks weak (does not oscillate as well as B2), some knock retard at low RPM (to be fair I was on purpose sort of lugging the engine at 1400 RPM in 6th to see if it would knock), rich on decel with a slow recovery to commanded, and lean/rich spikes at each upshift gear change. Are any of these worth addressing?
Thread Starter
Staging Lane
Joined: Jan 2018
Posts: 57
Likes: 8
From: Ottawa, Ontario
Before abandoning this post I am curious as to why it failed to get a response. Title not catchy? Description boring? Too easy/hard to answer? Just curious so that if I post in the future I might avoid the problem. Thanks. Rob
TECH Fanatic
Joined: Jan 2022
Posts: 1,034
Likes: 468
From: Seattle
Just my .02,
Besides the general forum slowdown in the summer, the guys that are actual pro tuners don't hang out here all that much because they they're all slammed.
you might try the actual HPT forums too.
Besides the general forum slowdown in the summer, the guys that are actual pro tuners don't hang out here all that much because they they're all slammed.
you might try the actual HPT forums too.
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Make sure you include your 100% stock original file so nobody has to spend time hunting down a stock calibration to compare against.
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Verdad Gallardo Thread Starter
Staging Lane
Joined: Jan 2018
Posts: 57
Likes: 8
From: Ottawa, Ontario
Sadly the original tune was done by a local "pro" who charged big $ but didn't spend the time to get it "right". I have since been trying to improve drivability and have made progress. Unfortunately, I don't have the actual original stock tune, only that what was available on the HPT repository which I attach herein. Is it truly a stock tune? I dunno.
Your data looks quite good to me. Trims are only slightly negative. And you WOT fueling looks spot on.
For your idle dip, I would try adding timing to the main spark tables as shown below. If it's not running the idle routine at the time it does it, this will artificially mimic the underspeed table and bump the timing when it sags which will raise the rpm. Just something to try.
I'd go ahead and do the same to the idle tables. Give it a whirl.
One thing about these issues and tuners. We need to live with the car for a week to work on this stuff. And we might not drive just like you do.
Even then, customers will always find the snivits!
Ron
For your idle dip, I would try adding timing to the main spark tables as shown below. If it's not running the idle routine at the time it does it, this will artificially mimic the underspeed table and bump the timing when it sags which will raise the rpm. Just something to try.
I'd go ahead and do the same to the idle tables. Give it a whirl.
One thing about these issues and tuners. We need to live with the car for a week to work on this stuff. And we might not drive just like you do.
Even then, customers will always find the snivits!
Ron