I Need A Little Understanding On Attessa Ecu.

[MidShipCivic]

I'm doing research on Nissan's 4wd GTR transmission for a retro fit on to a customized midengine car its such a great system and I'm proud of Nissan accomplishments with the GTR and its system.

Now what I need to discuss for my application is.

I'm not sure what skyline GTR to get from what I can understand the GTR system reads from VSS hub rings

to read wheel slip.

Now in common practice a Vehicle with ABS computer has its system set to a certain tire size so putting a different wheel size would make the system operate incorrectly.

Whats doesnt limit the ETS system from in operating incorrectly when you install a wheel far beyond the wheel size of your GTR's ?

I planned to use BEE*R's ETS box instead of getting an OEM unit because I plan to do some drag racing but this is not what my project is focused for. I emailed the dealer otomoto which carries the Bee*r box and ''Ben'' from there told me with out explain that the tire size doesnt matter how can that be?

Also comparing the different model's

R32 ( factory 16's)

R33 ( Factory 17's)

R34 ( Factory 18's)

are the Hub rings a different size when you change your whee size doesnt your speedo get thrown off?

- David Steele

(R32 GTR diff and Scehmatic)

Edited September 19, 2006 by MidShipCivic

[Duncan]

well the wheel speed sensors are on the diff at the rear as shown in your pic.

the front and rear driveshafts need to rotate at the same speed to keep the ecu happy, just as they would for ABS operation. But as long as tyre size is within a % or 2 front and rear it will be fine.

Yes the speedo does get thrown off but the only thing that matters to the computer is the difference in front and rear rotation.

As well as changing tyre size you can change diff ratio without impact.....as long as you have the same ratio front and rear.

BTW you also need the g sensors they are the main input to the system not the wheel speed sensors. They need to be mounted level as close as possible to the centre of the car.