Racelogic Traction Control on AWD
13 February 2005, 10:57 AM
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Racelogic Traction Control on AWD
Looking at the Racelogic site, I am very interested in their traction control product. Following some discussion I had with AndyF, I sent the following query to Mike Broadbent of Racelogic, and his reply is here, there are also some excellent FAQs on the site www.racelogic.co.uk . I have pointed him to this thread to discuss things in more detail as he kindly said he was happy to try to contribute.
"Interested in Racelogic Traction control for a modified turbocharged AWD road car that weighs 1290 kg and has 450 BHP and 400 lbft, soon to have about 50 more of each, so it is starting to get "interesting" in the lower gears or in adverse conditions.
How well does it work with an AWD car? I was thinking that the slip involved may not be easily detected as significant levels if all four wheels are slipping - say in a four wheel drift or in a straight line? I would expect there would be some differences in wheel speeds, but how well does it work in practice?"
Mike's reply:
"You will find that even on an AWD vehicle, when the wheels lose traction that they don't all spin at the same rate. Consequently our system will work fine on your car - it monitors all four wheels at the same time, making constant comparisons. As soon as it detects a level of slip as determined by the driver it will make the necessary injector cuts. I imagine that these cuts will not happen as often, or be as severe, as it is in a 2WD car with similar power, but it will still work a treat when your car's mechanical grip has been exhausted."
I have sent a further query to Mike by email and pointed him to this thread.
Any thoughts anyone?
"Interested in Racelogic Traction control for a modified turbocharged AWD road car that weighs 1290 kg and has 450 BHP and 400 lbft, soon to have about 50 more of each, so it is starting to get "interesting" in the lower gears or in adverse conditions.
How well does it work with an AWD car? I was thinking that the slip involved may not be easily detected as significant levels if all four wheels are slipping - say in a four wheel drift or in a straight line? I would expect there would be some differences in wheel speeds, but how well does it work in practice?"
Mike's reply:
"You will find that even on an AWD vehicle, when the wheels lose traction that they don't all spin at the same rate. Consequently our system will work fine on your car - it monitors all four wheels at the same time, making constant comparisons. As soon as it detects a level of slip as determined by the driver it will make the necessary injector cuts. I imagine that these cuts will not happen as often, or be as severe, as it is in a 2WD car with similar power, but it will still work a treat when your car's mechanical grip has been exhausted."
I have sent a further query to Mike by email and pointed him to this thread.
Any thoughts anyone?
13 February 2005, 11:26 AM
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14 February 2005, 04:37 PM
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"Thanks Mike. From the manual and the software, it seems locked to expect one axle to be driven and one reference, how would it be setup on AWD? Although my setup usually understeers, in some situations it will power oversteer, so does the software cope with this if you set front to driven and rear to reference?"
Mike's reply:
"That post is an excellent start - I look forward to answering peoples queries. I notice that one of the first replies is 'where's the fun in that?' - not an uncommon perception. I spend a fair amount of my time explaining to potential customers that actually Racelogic Traction Control is a performance-based system, so it is all about maximixing available grip. It is completely unlike OE traction control, which often uses brake assist or throttle intervention, which, whilst making the car stable, definitely removes the fun from driving it. With RLTC installed the car can be driven harder and faster, whilst still maintaining the obvious safety benefits in poor conditions.
As far as the driven and reference wheels are concerned, it's not really an issue. As you mention, they can't be altered in the software and it actually makes no difference which are driven and which are reference. (To be perfectly honest I think I'm going to have these terms removed from the program). Consequently, on your car it will control the understeer and the oversteer as they occur. Once any wheel exceeds the maximum difference allowed then injector cuts will be made accordingly - it's surprising, even on a powerful car, how few cuts are needed to get it back in line.
I'll register with Scoobynet and reply direct in future if you like. You can paste the above in though if you like."
Mike's reply:
"That post is an excellent start - I look forward to answering peoples queries. I notice that one of the first replies is 'where's the fun in that?' - not an uncommon perception. I spend a fair amount of my time explaining to potential customers that actually Racelogic Traction Control is a performance-based system, so it is all about maximixing available grip. It is completely unlike OE traction control, which often uses brake assist or throttle intervention, which, whilst making the car stable, definitely removes the fun from driving it. With RLTC installed the car can be driven harder and faster, whilst still maintaining the obvious safety benefits in poor conditions.
As far as the driven and reference wheels are concerned, it's not really an issue. As you mention, they can't be altered in the software and it actually makes no difference which are driven and which are reference. (To be perfectly honest I think I'm going to have these terms removed from the program). Consequently, on your car it will control the understeer and the oversteer as they occur. Once any wheel exceeds the maximum difference allowed then injector cuts will be made accordingly - it's surprising, even on a powerful car, how few cuts are needed to get it back in line.
I'll register with Scoobynet and reply direct in future if you like. You can paste the above in though if you like."
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14 February 2005, 09:07 PM
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Sounds promising 
Can it be set with a minimum rpm point of operation, ie for standing starts a little bit wheelspin can be a good thing, especially with a grippy clutch and light flywheel.
Andy
(I know, I should go read the website
)
Can it be set with a minimum rpm point of operation, ie for standing starts a little bit wheelspin can be a good thing, especially with a grippy clutch and light flywheel.Andy
(I know, I should go read the website
)
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