GW_Rowan

Thanks @Adamw - yes I've definitely got an issue on LR. I need to get it up on a hoist to change the gap.. it seems like it's around 1.5mm vs RR 1.2mm I actually had to adjust the wheel filter down to 5hz, as at 20hz getting a lot of false slip spikes on it, and only the occasional one at 5hz. Found it super odd that it seems to get better after warmed up.. must be so subtle the thermal expansion in the diff/mounting plate/axle (it's going off a toothed wheel mounted on the mx5 diff) It's a very light car (670kg) with a quite square wheelbase/track, excessive slip is downright scary (it wants to oversteer very, very quickly...!) so keeping the slip targets low to start with until I get comfortable with it. Will have a play over the next week and report back what difference the torque recovery settings make.

Thanks for the offer @Adamw went for a blast this morning. I've got a pretty solid log file here. I have noticed for the first time when cold tyres it go 100% cut very quickly very much feeling like it's killing engine power, but then after it's warmed up a little less so. I can feel the oscillations so yeah if it can be tweaked that's even more fantastic (noting SAS had asked me to send the log files for him to check the settings on I just hadn't had time to ! ) https://drive.google.com/file/d/1lBygIEjccr6X0kv_-CD83M62gE75WHy-/view?usp=sharing And heres' the current settings:

Once I'm past my next big push at work I'm going to do some onboard videos so you can see what it's like. I'm assuming @Vaughan please correct me ! If I have the wheel speed filter at 20hz you'd see the a slightly finer sawtooth and therefore smoother cut application so the variance between slip and target slip (should) be a lot closer. I'll try to do some back to back runs at 10hz to see if I can feel the difference. at 20hz I was getting so many false slips it was a bit unwieldy to drive. That's with Ignition Cut. I think Fuel cut is more applicable for some engines - but we want flames I want to tune the lateral acceleration reductions a bit more so it's a bit tighter in the corners vs looser on the straights (upto that 8% or so @David Ferguson ) the run above I was just getting a feeling for initial reductions and how quickly it would transition as you crossed +/i ve G's. Not something in my car you really want to go planting foot mid corner and getting more slip than you bargained for It is frighteningly quick now accelerating out of a corner, you can get on the power way earlier, and have optimal traction exiting... something that I basically other than really knowing the roads/hot tyres etc I'd have to be super careful with before. She's 400hp at the crank, 670kg at the wheels... I used to say my GR Yaris is point to point faster than the Fraser on unsighted roads because of that grip out of a corner, now with confidence in the Fraser I might be reversing my decision... As with everything the problem is just moved further along. Now you arrive at the next corner at warp speed

Getting some more tuning time and setting the slip tables up how I like them, starting to trust it and had my first proper squirt through a 'chicane'. Hot roads, hot tyres (AR1s), pulling 1g laterally and getting the brave pills to lean on the TCS through it. Beats the pants off the Racelogic system and shows pretty graphically how there's no way I can go full throttle in this car through low speed corners on the road. Unfortunately my sensors are giving bunches of false slips at anything other than 5hz filter, so I need to design a new system for the rear end, once that's sorted 20hz input should get some finer grained slip control...

Well I got everything working very very briefly until the alternator pulley lunched itself (unrelated to TCS... was on the way out before) Was hellishly addictive for that brief 10mins ! The day prior I turned on ignition timing based only, which was pretty good, but definitely needed to go to full cut based. Went with ignition cut based which sounded mega impressive and felt awesome. Definitely in the very brief 10mins it had much better engine management than the Racelogic system - the combination of ignition trim and ignition cut worked well. 1st gear is almost a waste of time in the wee Fraser and it was popping and banging away.. into 2nd and you hear the odd light popping, but it was mostly controlling it through retard alone with only slight cuts now and then. I'd had 4% target slip and it was holding it the entire way through 1st/2nd. The top end of 2nd (around 100k) was mega impressive.. you could hear retard changing as it was controlling the slip. Felt 'almost' like it was down on power, which of course that's actually what it was doing.. Once I get alternator sorted I'll be tuning it and do some videos of it working. Next on the list is get the accelerometer setup correctly so we're measuring which is outside correctly, then overlay a slip table based on accelerometer/speed to reduce slip based on cornering. So say at 100 being at around 5--8% straight line, but 2-3% cornering. Whereas at say a low g 50 kay corner more like 5-7% slip. Annoyed, I didn't save the log with it all fully wound up and doing the business. Here's test run 1 graph, ignition retard only at around 5% target slip, with supercharger belt slipping so not reaching full power. (note the wheel speeds are out here... that's more like a 0-95 run)

I've actually got a Link -> controlling a Davies water pump. And I think it's actually going through one of those SSRs the label above it ENG/WP. I'm not 100% sure what's on that circuit but I'd say good chance you're fine.

If anyone gets this far word to the wise, in the unlikely event they follow the same path, the IE5238 sensors don't work with the G4X. Overlooked in the schematic above was the min voltage (3.6) which wasn't going below 1v. So now in a holding pattern waiting to get my hands (well the shop is..) on a suitable adapter to make them speak the required 1's and 0's.

Hi @curly sorry I meant to reply earlier, hectic life in startup land. Very interesting to hear your experiences. I would be surprised if TC has any effect on the hardware side, unless your guy has 0 mechanical sympathy and just living on the limiter. I did read that certain engines may not be terrible stoked with constant ignition misfires. I'm imagining there's a difference between 'ooh there's the limiter I'll back out a smidge'. vs every corner the engines making more braps than a rotary around the corner I've pulled the pin and going for a G4+ to G4X upgrade, for a bunch of other reasons, so the guy who's doing the work is also going to setup Traction Control. I've been messing with the settings on the Racelogic and it really is limiting (no pun....) to not able to adjust slip by speed. For road use it can feel good straight line coming on at 95-100 with around 5-10% slip. Gives immense amounts of extra acceleration being able to hold the throttle open, but the same slip value down low say pulling out of a roundabout it's very much wants to come on to early where you really want 15-20% slip. So looking forward to it !

@curly how did you get on with it? Very intrigued to see ...

Sure thing, here you go. https://www.rowanhick.com/fraser-sp330-full-build-history

Ha ! Just done it on my car. You need to enable ODB output like the attached in the CAN setup and your gauges (should!) come to life. I'm running the watertemp gauge over CAN, there was a mixup my order and the tach is unfortunately old school.

Thanks @curly ! I'll go check those settings out. Good luck with your setup..

Out of interest I got the Racelogic system running in my Fraser this weekend (despite being 99% wired in for 8 years!). Re-confirmed "why wouldn't you run TCS if you have the option". Top of 2nd gear it really turns it into an animal.. interestingly because when you're pedalling you're drastically cutting off power, vs fuel cut is faster with throttle butterfly open, I'm hearing the BOV more But low down (particularly cold roads) you can really feel coming into and out of fuel cuts. So of course I was wondering what the G4X would improve upon - as the internet is really devoid of onboard videos of it ! , and had a bit of a dig, ended up downloading PCLink. I had a look through the configuration options and I can see that for determining/configuring slip the G4X would be an improvement on the RL system - having a table of speed vs lateral G is definitely the go. [The RL system's slip %age can't be configured to drop with speed... so set well for low speed ends up being a bit hairy for high speed..] What was not immediately apparent is how/what controls the engine power. From what I think I've read there's configurable options to change retard and/or ignition and/or fuel cuts to cut power output. [the car doesn't run DBW so that's out of the question] Had a scan through the traction control help but couldn't see it - I read about the closed loop control but not what it's controlling .. So guess I'm just looking in the wrong place/being blind? Thx

Awesome thanks @Vaughan will wait and see what the story is with my current ECU and go from there.

Thanks guys - @Vaughan my old ECU is down with you guys at the moment, so depending on outcome might be the push to jump to the Xtreme model. The Fraser is mildly terrifying on anything approaching damp, and really noticed it here as compared to up north. I had a RaceLogic in a TT Z32 back in the day and then (waaay back then) it was amazing. I think the approach the Racelogic had would be almost too unsettling in the Fraser as once she lets go would almost need the maximum cut level to bring it back and could be quite brutal the "on/off" nature of the aggressive fuel cuts. I then saw some footage of a Motec unit from the Motive guys in AU channel and immediately went "that's amazeballs". If the Link G4X is comparable that would definitely push me over the edge. Just surprised not many videos out there, as (good) traction control is absolutely transformative on a high HP/rwd build. I found one of a boosty boi Mini in the states but that's been largely it. The Motive guys have got an example of a high hp RWD skyline utter handful, turn TCS on - different machine. [Which I'm assuming the G4X is similar.. if so might be a good marketing thing to do!] Just prompted me on my lunch break to have a look, and we did get our rear speed sensor pickups working. So in theory just gotta get the front wheel speed pickups working... . I'm assuming the G4X is quite flexible on Sensors? these are the ones I've got at the moment.

Hi ! Just wondering if anyones got any footage of the G4X traction control in action ? I've got a slightly ridiculous machine (Fraser: Supercharged Type R K20a / 330hp at wheels / 670kg) and moving to the South Island with colder road temps, and rougher surfaces, traction has become a bigger issue so just evaluating what to do about it. Running on almost the stickiest tyres I can for the road (AR-1s) Currently got a G4+ in it with an outdated Racelogic system that we just never could get working right from a sensor perspective, the project stalled for a number of years, and now revisiting it. I'm interested to see what the G4X TCS is like but footage is very very slim on the ground. Very very tempted to ditch most of the loom and go G4X + PDM. Thanks -Rowan