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I Cant Hold Boost.

scotty nm35

By scotty nm35,
in Four Door Family & Wagoneers

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Sunkist Grand Master

Sunkist

Posted
Posted
hmm, this sounds good. I could setup a switch to enable the lockup circuit again for when im highway driving (like going to melbourne for my tune)

lol love this ghetto mod. thanks scott.

worth doing it knowing its going to be a little safer being cooled. :P

zei20l Grand Master

zei20l

Posted
Posted

are you SURE it actually closes the transmission cooler?

it would seem VERY irregular to stop the transmission cooler from working when youre in a mode where you need it more. are you sure it doesnt restrict the fluid passage to the cooler to increase the pressure in the gearbox? that would make it shift a little faster giving it a 'sports' feel

scotty nm35 Grand Master

scotty nm35

Posted
  • Author
Posted
are you SURE it actually closes the transmission cooler?

it would seem VERY irregular to stop the transmission cooler from working when youre in a mode where you need it more. are you sure it doesnt restrict the fluid passage to the cooler to increase the pressure in the gearbox? that would make it shift a little faster giving it a 'sports' feel

I have the full Re5 trans rebuild manual here that says so Iain. Also, I blew my box on the dyno due to overheating in manual, on the stock turbo at 179kw if I remember. In drive there is no problem as the cooling cct is working.

Nissan designed it that way because once the torque converter is locked you dont need cooling. (other than the lockup clutch slipping to buggery as I found out)

iamhe77 Grand Master

iamhe77

Posted
Posted
I blew my box on the dyno due to overheating in manual, on the stock turbo at 179kw if I remember.

You sure that was the reason bud?

Wouldn't have something more to do with the Dextron that was in it?

Pretty sure that our trans can deal with 180awkw... even in manual mode.

Nissan designed it that way because once the torque converter is locked you dont need cooling. (other than the lockup clutch slipping to buggery as I found out)

hmm... this doesn't explain why the transmission lever (just above the shift gate) is still cool and my PWR cooler is damn hot whenever I get home from work (~30mins highway travel)

Shouldn't this be the other way around if the cooler is bypassed once the torque converter locks up?

scotty nm35 Grand Master

scotty nm35

Posted
  • Author
Posted
You sure that was the reason bud?

Wouldn't have something more to do with the Dextron that was in it?

Pretty sure that our trans can deal with 180awkw... even in manual mode.

hmm... this doesn't explain why the transmission lever (just above the shift gate) is still cool and my PWR cooler is damn hot whenever I get home from work (~30mins highway travel)

Shouldn't this be the other way around if the cooler is bypassed once the torque converter locks up?

I never proved either way, I doubt the fluid ever got changed. I know it has Dextron in it now. :)

Im only going by what the auto joint said, I am looking into the valve body section now, the cooler circuit may well work, now I have seen various reasons for the radiator to overheat at idle like the airlock, it could possibly explain the overheating I was getting.

It still doesn't help me of course, I lock the converter manually with a 12v switch on the dyno, it wont hold in 4th or 5th, only the lower gears, which is understandable as it isnt a very big clutch anyway. With the factory trans ecu softly actuating the lockup, even in manual, it will be slipping and heating the fluid even at stock power levels.

  • 2 months later...
scotty nm35 Grand Master

scotty nm35

Posted
  • Author
Posted

I finally got around to installing this actuator today, I put a stronger spring on and fit it to the turbo with little hassle.

With no controller it held a stable 17.5 psi, with the BOV grubscrew mod it sat on a steady 19. That's a perfect base to start from I think. :)

Im going to run it up on the dyno tomorrow and see how everything looks but the Emanage logs showed me the AFR's are all good. It certainly feels better, driving around.

post-63525-0-42138800-1295782180_thumb.jpg

Sunkist Grand Master

Sunkist

Posted
Posted

I finally got around to installing this actuator today, I put a stronger spring on and fit it to the turbo with little hassle.

With no controller it held a stable 17.5 psi, with the BOV grubscrew mod it sat on a steady 19. That's a perfect base to start from I think. :)

Im going to run it up on the dyno tomorrow and see how everything looks but the Emanage logs showed me the AFR's are all good. It certainly feels better, driving around.

EBC !! dont forget

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