FRIEND WITH Stagea (GTR wagon) NEEDS HELP

[Mrsexpo]

A friend of mine has a Stagea (GTR wagon) and after putting a new (R34) engine in it, it has developed a surge (from driveline) at light throttle (cruise). At the same time, it is giving too much drive (according to the torque split gauge) to the front wheels. Seems like it thinks the rear whells are spinning.

[Duncan]

I'm not sure about the surge in the driveline at light throttle, are the tailshaft unijoints tight maybe?

As for front torque there really shouldn't be any unless you are either taking a corner hard or accellerating bloody hard so it sounds like something is wrong there. Is he using the same size wheels and tyres front to rear?

[Mrsexpo]

We are aware that it shouyld not have any torque going to the front wheels under the conditions that you describe. That is the problem. It's getting too much torque to the front wheels. When it is driven hard, the sterring wheel is just about being riped out of his hand.

Wheels are the same.

The surge and the torque split problem are one in the same.

[ylwgtr2]

was it a straight fit or engine swap?I assume he has adjusted the tps correctly?

[Mrsexpo]

It had an R33 motor in it, and after an oil pump problem, it was replaced with an R34 engine.

Pardon my ignorance, but what is the tps? As you can tell from my profile (and pic), I drive a Soarer. He hasn't got Internet access.

[Blitz]

OT: Love the graphics on the car mate

Perhaps you should look into some sort of torque split controller

[bambinator]

Did he put in *just* the motor from the R34, or the front diff as well? As you are no doubt aware, R33 and R34 diff ratios are different - could explain the problem.

If the diffs are OK, I'd be checking simple things like tyre pressures and wear, and perhaps try rotating front to back.

[Mrsexpo]

Already done all the things mentioned. Correct difs, tyre pressure, etc.

WTF is TPS (see post from ylwgtr2 yesterday)???

[Amaru]

TPS = throttle position sensor

[Spook's_Skyline]

throttle position sensor

[Mrsexpo]

It's not the tps; the problem is in the torque split, anyone with any other ideas?

[NRB]

How's the clutch? Maybe it's worn and somehow creating the problem? I know on gear changes torque seems to be directed to the front... I was experiencing the same problem you describe on 2 occasions: 1/when I had a dodgy clutch 2/ when my inner edges were scrubbed and the ECU thought tyres were rotating at different rates front:rear.

[Mrsexpo]

Clutch is new as are the tyres!

[Serious-Seven]

Clutch is new as are the tyres!

are you sure you havent got a retarted ecu ? or does it use another ecu ?

[blind_elk]

I had a similar problem with my GTS4 - it turned out the connections to the TPS were a bit suss. Make sure they are connected properly, maybe use a bit of contact cleaner on the terminals as well.

You should know what a TPS is - its not an item specific to Nissans, Toyotas have them too.

[Sydneykid]

How is the wiring harness from the ATTESA controller to the transfer case? If there is a poor contact or broken wire you get this sort of stuff happening. Did you reset the ECU's before you started the engine? It may also be worthwhile getting one of Impakt's diagnostic displays (like a Nissan Dealer Consult) and checking out the sensors. The R34 engine sensors are slightly different to the R33's. Did you swap ALL of the R33 sensors (off the old engine) when you changed over to the new engine?

There are a few more things you can try, but I suspect one of the above will be the problem.