Installed R33 Turbo And Now I Have Hesitation Under Acceleration, Idle Issues And Loud Turbo Whistle

[RIPae86]

Hello

I recently installed an r33 turbo in a stock r32 gts4 and i drove it for a few days and it was fine, it obviously needed a tune. All of a sudden on the drive home tonight the car has severe hesitation when i open the throttle (like the car is stalling, rocking back and forth) and the idle is high at 1500 and sometimes moves from 1000 to 1500 continuously.

On top of that the whistling of the turbo has gotten louder.

I had a look over the vacuum lines but apart form that I really dont know where to look for the problem as it ran fine yesterday (I haven't driven it hard because I'm waiting to get it tuned properly). Has anyone had any of these issues?

[ARTZ]

whistle usually indicates a leak of some sort..

[scotty nm35]

You wont be able to tune it until you sort out the leak/issue. Its a decent leak, check all the larger hoses on the plenum, as the idle is high its after the throttle.

[Brezza]

yeah, i've got the same issue.

the car runs fine but i do hear a slight whistle when on boost after some very heavy throttle. but the car stil goes fine.

i'm pushing some pretty decent boost though. 24psi

[ARTZ]

check the bolts that hold the turbo on ,they are probably loose .

[geraus]

yep check the 4 bolts... always happends to me! hehehe just tighten up a bit and it will go away..!

[RIPae86]

thanks for the replys!

I found an intercooler clamp that seems to get loose after a few kms of driving, that has been replaced. Also changed some worn vaccum lines.

Still after a few kms of driving there is some hesitation that goes away momentarily after turning the car off and on again.

I'm checking the turbo to manifold bolts as we speak and will post what happens

thanks!

[Brezza]

yeah, i've recently had the intercooler changed as well as the clamps. and its only after this that the whistle appeared.

its more than likely a clamp that is leaking a slight amount when under pressure.

i'm probably due to change the vac lines though. the car is 20+ years old and the hoses would more than likely be the same ones that came on the car brand new.

when i had my idle control valve blocked off the car boosted higher. so leads me to believe that the lines are pretty old and maybe some new ones might help hold boost to redline

[RIPae86]

Your right Brezza, it might be that a few of the cooler hoses and vacuum lines i have are just too old, i replaced all of the original ones when i swapped the turbo.

I double checked all of the vaccum hoses i could see and replaced all of the 4mm and 6mm hoses i could see (Didnt have any replacement hoses for the big ones so not changed yet) - still whistling

I tighten the bolts but only millimeters as its already fully loaded (I hope they dont break) - Still the same whistle

But then I realised the the r33 turbo does not fit on the stock intake rubber pipe of the r32 and is quite loose, I tightened the rubber hose with the clamp but it may still have some leaks. So i got a bit of intercooler 2.25" hose and put it over the turbo intake and then put the r32 intake hose over it, it was a tight fit. I then clamped it tight and took the car for a drive.

I noticed there is less whistling at lower rpms and it comes on at a higher boost than before, maybe a 1000 rpm higher but not as loud. There must be boost leaks somewhere so i just have to find it. At this rate though i would be replacing every rubber hose in the car lol

Maybe I need an r33 intake hose but putting it in the r32 means I cant have the stock airbox position as its longer...

A good thing is a havent seen any hesitation on my test drives sop lets hope it stays that way

Edited July 5, 2011 by RIPae86