xDspec

iTrader: (-3)

Alright here is my setup:

1987 N/A chassis with 1987 TII motorset/tranny
Microtech LT-8 standalone
stock turbo
corksport fmic and kit
walboro 255lph

I think that is all the mods that will matter

Here are my problems:

It overheats! brand new thermostat, newer water pump, pulled everything apart, checked, put back together, still overheats.

It runs 10.0 (maybe even more rich as my gauge only reads as low as 10.0)

My wastegate doesn't open? (mad compressor surge at idle, WORSE with a load.)

Any help would be greatly appreciated.

xDspec

iTrader: (-3)

any ideas?

Evil Aviator

Is it overheating at idle, or after driving the car?

What kind of radiator and fan?

Sounds like the turbo is shot.

xDspec

iTrader: (-3)

at idle, i didnt bleed the air from the cooling system, thats the only thing i can think of.

Turbo isn't shot, i checked for shaft play when i had it off the car and there was near none. Oh i should mention im using an AEM tru-boost and have my wastegate crack spring pressure at 5.0 psi. dont know if that would do it.

jjcobm

iTrader: (18)

Does the coolant buzzer come on? The first thing you should of done before even driving the car is bleed the cooling system. Besides that I am not sure what the odds are but could be possible the fan clutch isn't working. Do you hear a swap cooler sound when you first start the car and then dissapear coming from the fan?

xDspec

iTrader: (-3)

I have an e-fan installed, blows a TON of cfm and is always on. and after i lose alot of coolant from it converting to steam and blowing out the overflow, yes the buzzer comes on.

Still no answers to it running a 10.0 AFR at idle?
and the compressor surge?

Evil Aviator

What was the gauge reading at idle when the engine was running well with the LT-8?

Describe what you are calling "compressor surge".

xDspec

iTrader: (-3)

it sounds perfectly fine, idles perfect, it just blows raw gas out the exhaust, ive never had it running with anything other than a 10.0. maybe its just not tuned correctly.

and by compressor surge i mean the chirping sound when the turbo spins backward.

xDspec

iTrader: (-3)

bump it up.

if i cant figure it out by next week its going in for a tune and inspection

Evil Aviator

Compressors do not surge at idle, so the noise is being caused by something else. Since your engine is overheating, the water pump could be making the noise, although it could be a number of other things. I agree that it is a good idea to take the car to a professional mechanic.

Also, FYI, the turbo does not spin backwards during a surge.

xDspec

iTrader: (-3)

I beg to differ, the change between boost and vacuum so quickly, without a functioning wastegate will cause surge at idle. And you're right it doesn't spin backward, its the pressure TRYING to make it spin backward that makes the noise. Either way, I've heard surge before, and this is it. I also watched the arm on the wastegate solonoid and it doesn't move, therefore the wastegate isn't opening.

K-Tune

iTrader: (26)

the wastegate doesn't have a damn thing to do with surge, the blowoff valve does. generally the car won't be able to make enough boost to open the wastegate unless it's in gear with a load.

which blowoff valve is fitted and where is its vacuum/boost source?

Hazard15301

iTrader: (5)

Do you have the plastic belly plate under the engine. It does help with cooling a great amount.

Evil Aviator

So how much boost is your turbo producing at idle?

xDspec

iTrader: (-3)

The BOV is an HKS SSQV v1.0 and it is T'd into a source going to the nipple on the UIM facing the driver side.

xDspec

iTrader: (-3)

ttt

Stevobob

iTrader: (1)

I thought it was just there to make getting at the engine from beneath a pain and refusing to release screws I drop while trying to get the engine back together.