Jump to content
SAU Community

Recommended Posts

I did a search and couldn't see anything on this.

My car is an R32 running HKS 2530 at 1.3 bar. I have a fairly choked exhaust with the stock dumps and front pipe. Power is basically unknown, it is pretty quick (I have a dyno of ~260awkw on the low reading mainline dyno in Canberra prior to replacing my cat). My car will come onto boost quite hard in 2nd and smoke the tyres up to high 7k rpm. Dramatic, but not the fastest way of forward movement. I drive like a Granny 98% of the time but I like to give it a hit now and then and wouldn't expect this in 2nd, nor is it especially legal. :P

I replaced the shit Nexens it had on it, with them the car would literally smoke all 4 at 100km/h. I figured it had to be the poor and balding tyres. I fitted 255/40/17 Toyo T1Rs to the TE37s all around which I've put several hundred kms on. It's slightly better but in second gear it's still hopeless, straight line is spins the wheels after 4500rpm.

Suspension is Bilstein shocks and unknown springs all around, with some changes to arms etc. as it came from Japan. The spring rates are of course stiff, but not overly so. The ride is quite compliant (certainly compared to a mate's WRX anyway). Camber is negative, but again nothing silly.

So my question is, WTF? How can a 4WD car with the same tyres struggle for grip when a mate's S8 RX7 (he runs a ported block + T04Z at 1.1 bar around 280rwkw) with the exact same tyres (basically the reason I bought them) have full grip?

Is there a certain set up that can cause this behaviour? It's got me beat. :)

Link to comment
https://www.sau.com.au/forums/topic/269209-tractions-issues-gtr/
Share on other sites

Im betting its not spinning all four wheels, I think it'd only be spinning the rears and there is something wrong with your ATTESSA or more likely your transfer case.

The clouds of tyre smoke out the rear when held at throttle says otherwise... so definitely rears (ie. you are correct). You can feel when the front comes in as it progressively transfers and regains grip (perhaps 'all 4 wheels' was a touch of exaggeration but it certainly felt like that on the old tyres - but just more wheelspin). Perhaps that regain of grip was just natural and at all the 4WD aid... Thanks for the thought, I'll look into it. But something doesn't seem right. :)

Yeah,

I'd be checking your transfer case. Firstly, they are tough but one good run at power where the rears slip but front doesn't will toast the clutch packs in the transfer case.

Try this, put the car on a jack (trolly jack with wheels) up until rears are just off the ground. Then slowly give it a little clutch to see if the fronts can pull the car forward. When my transfer case was stuffed it couldn't pull the car forward at all.

Also check the smell of the transfer case fluid. If it smells burned then that is a bad sign. Like others said, bleed and check the attessa system.

I did the plates in my transfer case which was expensive. Might be better off just swapping the whole transmission as I've seen a few for sale on the forums.

Best of luck.

Good luck, if your transfer case was really, dead, the car becomes un-drivable, when my one died, I could release the clutch and the car would not stall (clutch had 1-2mm left on it, transfer case was broken).

Nah it's definitely working, in 2nd I'm getting 10kg/m which results in wheelspin. Whereas in 1st I get the full 50 which is no wheelspin (obviously less power in 1st too). I'll have a shop look at my suspension set up and then decide if I need a ATTESA controller.

Nah it's definitely working, in 2nd I'm getting 10kg/m which results in wheelspin. Whereas in 1st I get the full 50 which is no wheelspin (obviously less power in 1st too). I'll have a shop look at my suspension set up and then decide if I need a ATTESA controller.

The guage doesn't understand how shagged your attessa system may or may not be. It assumes it is working perfectly & displays how much front torque you would have if the system was working properly & the motoro was standard.

What frequently happens with Gt-Rs is the clutches in the attessa system wear. This causes the clearances in the system to become out of tolerance & you get a slow reacting system - ie more rear wheel torque than it should have. Given the system is old, slow to react & calibrated for a stock motor it is quite easy to end up where you are ie with a GTR driving like a GTST.

I meant it's definitely working not because of the gauge, but because jacked up in the rear only it lurches forward just by letting the clutch out at idle. It may be slower or not as strong, but it's definitely 4WD still. I'll resist spending a bomb rebuilding the transfer case for now.

You've been subjective with spring rates and camber in your post - what are the numbers?

Have you tried pineapples in the "traction" configuration? Although IIRC SK reackoned on 32 GTRs the "neutral" config was better, so maybe try both.

Its the transfer case. Testing without load means nothing.

Get it put onto a 4wd dyno with torque split monitoring and id almost bet my race car's transfer case that yours is shot.

They become slow and end up with rear wheel spin. Eventually when its really rooted it wont drive off the jack. But at the moment its only slipping under load.

We re-build our cases with specially designed clutch plates every 48hours or so of use as this exact problem starts to occur on the circuit. Mines doing it atm and needs to be rebuilt.

On the road with genuine parts your transfer should last a very long time. Its not as an expensive excersise as some people think and in my opinion ANY R32 GTR which has not had it done should have it done.

You've been subjective with spring rates and camber in your post - what are the numbers?

Have you tried pineapples in the "traction" configuration? Although IIRC SK reackoned on 32 GTRs the "neutral" config was better, so maybe try both.

Sorry it's running some camber - unsure how much. Spring rates again unknown :D . As per Japan basically... ie. no idea LOL.

Pretty sure it's the transfer case, like Risking said just slipping under load. Rebuilt for under $1k I would be happy, cs! I'll struggle here for that I reckon.

I personally went down the path of second hand (R33 transfer case), and paid $400 for a second hand transfer case to be fitted, in my case I it wasn't the clutch pack that went, it was a shaft...

I personally went down the path of second hand (R33 transfer case), and paid $400 for a second hand transfer case to be fitted, in my case I it wasn't the clutch pack that went, it was a shaft...

It's gotta be clutches in mine. So rebuilt is preferred.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • So, I started this repair and got as far as "fixing" the holes with some fibreglass. God all those years working on boats came back quickly. I decided I'd reach out to some rust guys just to see what they would say about it. I came across a guy about 40 mins away and went to see him. He said the windscreen needs to come out, that there might be some more bits around the windscreen and he'd quote them at the time. But his quote was $300 to remove and replace windscreen and $3k for the damage he can see. He said he could respray the roof for $1200 and the bonnet for another $800 (somebody has previously rattle canned it, its horrendous). This is $5300 + any small additional bits. It's a lot, I get that and the name of one of my fave youtube channels 'Not Economically Viable' comes to mind.  I'm not being financially rational, but I've taken him up on the quote. He's opening a new shop in November with more room, so we're waiting for that. I'll leave the currently missing headliner out until then. I'm looking forward to it being fixed and having the paint looking nice again (lots of clear coat issues on the roof too). / flame suit on.
    • Oh and some up-and-comings; New rear drivers wheel bearing. I'll do that this weekend while the diff is out. The car is already up and the d/c axles and missing exhaust will help with space. This is the last bearing for me to do and I've been dragging my feet on it. I also have some new EBC blue stuff pads for the car and some new brake fluid. I haven't ever flushed the fluid in this car and looking forward to it. I have 600 degree fluid to put in. Not exactly "race fluid" but better than the typical stuff I have been using.
    • A proper clutch/plate type mechanical diff with quite a lot of pre-load and high locking % is better for drifting. Much more consistent in its behaviour. A helical can be annoyingly vague and inconsistent in how it responds under the sorts of abuse found in drifting.
    • Some updates here. I pulled the entire interior out, minus some trim to respray the seats with Colourlock dye. It turned out really nice though I accidentally let the dog in the car after and she scratched up the front seat.  This is what it looked like before, the colour was just washing out everywhere but thankfully the leather was in good nic. Then after the respray   And after the bloody dog jumped in The headliner is out waiting to be retrimmed, but it will stay out now until Nov - see why below. I replaced the stereo/headunit with a period-styled Android headunit. I have no after pics, but I'll get some. This is because of the missing pixels. I tried to fix this twice with replacement ribbon cables but couldn't. Also the bluetooth interface I'd bought for this was crap. Then there's the rusty roof. Pics and info in this other thread. I have decided to get this repaired professionally, but I'll update that thread. This is why the headliner will stay out for now. I'll be getting the roof and bonnet resprayed at the same time the rust is fixed. I also had an interesting issue with my drivers door lock.  For a small period I was having issues getting any 12v power to the car - I mean *any*. It would have no dash lights, nothing. It happened while I was at the shops and I couldn't get in the car. So, we had 2 problems. The most pressing here is that I was locked out. I have only a single physical key hole on the car, the drivers door and no amount of turning would unlock the car. Surely it doesn't need power for this? The second issue is why am I losing all power periodically, The battery isn't dead, its almost like the battery isn't even there. Two issues that were surprisingly easy to fix. You fellow BMW over-engineering lovers will appreciate this. The lock in the door has 5 states; mechanical lock, electric lock, neutral, electric unlock, mechanical unlock achieved at -90 degrees, -45 degrees, 0 degrees, 45 degrees and 90 degrees. Although, the unlock is towards the front of the car, so opposite for LHD countries. Sticking the key in and turning 45 left or right is what is used 99% of the time. It activates the central locking etc. 90 degrees is for dead battery access and, obvs, only un/locks the one door. But because the mechanical lock is never used and is 27 years old, it seizes up. I was totally unable to turn the key far enough to get to the mechanical unlock (At the time of locking myself out, I didn't even know this was a thing). I eventually did it with some vicegrips and teflon spray.  I made a quick vid for other E39 peeps.   The battery issue is totally new to me also - It wasn't making sufficient contact between the post and the terminal. The terminal was bolted on tight, but the car wouldn't have power. After checking the battery with my multimeter I accidentally contacted the terminal and the battery post and the car got power. The battery was only a few years old and in good condition. I cleaned the post and the terminal with a wire brush, bolted it back on tight and never had the issue again. I'm still surprised that despite having solid contact it didn't work. Also, the car was getting Warragamba sized pools of water in the back when it rained. My initial concern was another rust problem. But when I went out on Weds while it was raining and while I had no headliner in I could see a steady stream of water coming through the roof mounted aerial. As this aerial is for the (now removed) car phone I pulled it out and whacked a blanking grommet in the hole. It seems fine now. I'm thinking I might get the hole permanently filled when the rust is fixed. Moving forward and things in progress; The tailgate needs some attention. I have taken all the trim off to clean it all and address some small rust spots. I have partially done all of this but I'll finish it up hopefully this weekend. As all the trim are now entirely devoid of trim clips I have bought a heap of strong velcro and I'm hoping it does a good enough job as any of this trim in good condition is super expensive and usually in Europe as we dont have many of the wagons here. Suspension and brakes!!! This is exciting. In the front; New control arms New sway bar links New lower Eibach springs (the only modification I'm planning on this car) M Sport shocks (these came with the car and will replace the longer shocks in the car) New top mounts Used 540i calipers (stock brakes suck!) New 540i disks and pads (22x296 mm for 528 and 30x334 mm for 540i) New front wheel bearings (thank all that is holy for bolt on bearings!) Annnnd in the back; New control arms New sway bar links Adjustable air suspension arms (fool the car into what the current height is so the self levelling suspension can match the new front ride height) New ball joints I'll also be doing a brake fluid flush while I'm in there. I'm planning on switching the car over to the 16's that came with it so I can clean up and respray the M Sport 17's. They've lost a lot of colour over the years and have some gutter rash. None of this will start until the E90 is back.
    • You mean you will regret it for drifting duties? I don't quite follow.
×
×
  • Create New...