compressor surge (1 Viewer)

[mudstorm]

Hey guys ive installed a gt2871 on my 1hd-ft cruiser

i have top mount cooler that i belive may be causing a restriction, because as soon as i get over 15psi the compressor starts surging like crazy huge chopping noise coming from intake

it has 3" intake piping through a k&n pod

3" exhaust with no muffler

.64 rear housing on turbo

any idea's or am i going to have to pull of my cooler and put in a 3" front mount

 

[87 HJ60]

Can't tell from the picture but does your intercooler mate up with some sort of hood scoop, or is there another way the intercooler gets a supply of air?
It's not just sitting there under the hot hood is it...?

 

[mudstorm]

Scoop

 

[Tapage]

if you recently check for compresor shaft play ? I don't really thing ( without much more detailed info about your intercooler that seems to be the 4WDbits.nz model ) your intercooler it's the restriction ..

 

[Wheelingnoob]

Have you run the numbers to see if you are pushing that turbo beyond its surge limit on that motor? It really sounds like the turbo is just moving more air than the motor can take and the turbo is backing up (surging). One think you could try doing is going with a larger turbine housing. I cant see the cooler blocking that much flow, a good way to test though is to put a boot gauge on the Compressor side of the intercooler and see if there is a larger difference. Usually you will see a 1-2psi or so pressure drop through an intercooler.

 

[gerg]

I just ran your turbo through a calculator and at 200hp with 20lbs of boost at 1650 rpm it barely scratches the surge line. Unless you are doing more than that I doubt it is your turbo sizing that is causing the problem. That was with 2lbs of back pressure from your intercooler.

At what rpm is it making that sound with 15lbs of boost?
g

 

[mudstorm]

it starts chopping about 2100rpm under load
turbo is new its done it from new aswell im thinking gt2860 next ..just throwing money at this thing now i just want a fun daily ...to much to ask