Custom traction control for TT
Melting Slicks
Joined: Jul 2008
Posts: 3,002
Likes: 216
From: Houston Texas
2018 Corvette of Year Finalist
2017 C5 of Year Finalist
I don't know about the other tires mentioned here as no experience with them (I'm sure they're fine) but 19" nt05r at 680whp would hook up 2nd easily on the street without warming them up or dropping the psi when the tires were new, and at the track when warmed up would hook 3rd most of the time at ~750whp.
Racer
Joined: Feb 2014
Posts: 466
Likes: 15
I've never used ProEFI, but have used better systems
Timing alone is a bad method of trying to maintain traction. I've spent more than enough time testing myself. Fuel cuts are far far better and offer a wider range of control for varying conditions. But yes initially timing is the first port of call, but I'd only ever allow small timing reductions.
I've tried with large amounts of timing and as said, it's useless...and when using timing alone in that manner...actually leaves the car quite unstable and it certainly isnt doing EGT's etc any favours which is a sign it isnt doing the engine any favours.
Timing alone is a bad method of trying to maintain traction. I've spent more than enough time testing myself. Fuel cuts are far far better and offer a wider range of control for varying conditions. But yes initially timing is the first port of call, but I'd only ever allow small timing reductions.
I've tried with large amounts of timing and as said, it's useless...and when using timing alone in that manner...actually leaves the car quite unstable and it certainly isnt doing EGT's etc any favours which is a sign it isnt doing the engine any favours.
Melting Slicks
Joined: Jul 2004
Posts: 2,844
Likes: 144
From: Northern Ireland
What are these "better systems" you have used? I do agree using timing for traction control is not the most ideal situation. That is why you don't make it rely on the traction control 100% of the time. You use it as a backup. It also depends a lot on the setup. The most timing I have ever seen it pull was 20 deg and it was after a WOT 2-3 shift and wheel speed jumped up very quickly and it brought it back and kept me from hitting a ditch. I did not even notice it pulled any timing or that it started spinning very badly because it realized the issue, pulled 20deg which fixed the issue, then went back to full timing in 2/10 of a second. I only noticed because I looked back at the log. I was around 22 deg at that point normally so it was at 2 deg for just over 1/10 of a second. Do you really think that will cause a large rise in EGTs?
I use Syvecs/Life racing ( I've used other systems too but this is by far the best ) For me, on airfields for 1km runs etc....until around 150mph I have very little traction, so traction control is working fairly hard until then.
No way would I ever contemplate allowing timing to be the main control parameter for TC there.
I've tested many configurations and cutting fuel is by far the best means of controlling power, the smoothest and there are no real downsides. I've tried many slip targets etc etc too, although even those can be very tyre/surface dependant.
I do pull timing first, but at no time do I allow it to pull any more than about 8deg, and even those would be extreme and fuel cuts would already be well underway too.
Although almsot regardless of surface, a well set up system will make the car much safer under almost any conditions, which is what I presume the OP wants.
Actually tuning it for optimal acceleration or performance...is much more difficult because of the variables.
Racelogic was a great system, nobody made any retrofit systems to match it, but with the advent of onboard TC on most decent ecu's....a retrofit system is more or less redundant given the work/cost involved to fit.
Although how on earth Davis are charging the prices they are for their systems....I've no idea.
Intermediate
Joined: Mar 2018
Posts: 28
Likes: 5
Sorry to bring this back from the dead but how are you guys implementing wheel speed into these Aftermarket Traction control systems?
Most I've seen utilize a driveshaft speed sensor which of course doesn't exist on our cars.
Most I've seen utilize a driveshaft speed sensor which of course doesn't exist on our cars.
Melting Slicks
Joined: Jul 2014
Posts: 2,356
Likes: 359
From: Virginia
Contact Brett Bradbury, he has a solution for adding wheel speed sensors to the OEM hubs.
Melting Slicks
Joined: Jul 2004
Posts: 2,844
Likes: 144
From: Northern Ireland
There's no VSS on the rear diff ? same thing really if that's the route you want to take.
Race Director
Joined: Dec 1999
Posts: 10,230
Likes: 885
From: Alexandria, Virginia, USA VA
Brett can install and tune it for you and you're right to go down that road. First as others have suggested run the R888 or Mickey Thompson sticky tires
I use a 335 18 which works well and fits the car with the right CCW rims
Call Brett, he'll have some very solid advice and be able to help you
Last edited by Rkreigh; Nov 1, 2019 at 06:06 AM.
