I have a 95 GSR Turbo with a turbonetics T3/T4 that is oil and water cooled. Fully built bottom end and a Nuforms blockguard. I am having a overheating problem that I cant seem to diagnose. At first I removed the thermostat and it still overheated. I just replaced the headgasket and the head studs with ARP's last Friday in hopes of remedying this problem. No such luck. Under heavy boost conditions (10 psi) for over 8-10 seconds the temp gauge will start to climb. The thermostat is still out as well. I was thinking that the turbo may somehow be blowing boost into the coolant since it is water cooled as well. I called turbonetics and they said that its not possible for boost to mix with coolant in the housing. My radiator is good as well and I have an aftermarket fan that is on all the time. When it gets hot the upper radiator house gets a fat swell in it too. Im gonna check and see if it could simply be the radiator cap but other than that Im stuck. What gives here. I checked my head and its not warped either.

 

I had the A/C on full blast yesterday in 100 degree temp. and slightly boosting and the engine temp climed up to about 1/2 way.. i turned the a/c off and the temp fell rather quickly... if it's overheating I usually pull over and get a drink at 7-11 and let her cool down a bit.

 

check your radiator if its really bad get a new one the CRR ones are great if you can get ahold of them. I think they are better than the fluidyne ones. and cheaper at that.

 

look no further then this!!


k

 

Don't blockgaurds inhibit coolant flow around the top of the cylinders? Thereby decreasing cooling efficiency and allowing the engine to get hotter. Correct me if I am wrong.

 

Viren, Are you talking about C&R? They can be reached at http://www.crracing.com or 317-293-4100. They do alot of awesome custom work and I think the quality is cheaper and better than fluidyne. Ask for Rob Cordona if you call he does the imports. He can make you a exact replica of the fluidyne for cheaper.

art

 

I have a blockguard I placed it an inch below the deck no cooling problems whatsover my fan is not even on all the time with this 100 degree weather. I just have a cheap $2 160 degree thermostat from kragen's

 

an aftermarket radiator may help a bit, but your problem is definitely the block guard.

that's been a known characteristic of using a block guard. also, if you have a resleeved block and the water jackets are smaller then stock as they usually are when resleeving, your motor is not getting enough coolant flow.

 

u said u don't have a thermostat in right. try putting a low temp one in or a washer or taking the stock one and ripping the spring and valve off so its like a big washer. there needs to be some sort of restriction to slow the flow of coolant down so it actually has time to be cooled by the radiator, with no thermostat at all the coolant may be flowing to fast and not getting a chance to cool down. just my $.02

 

thanks for all the replys guys! I dont want to pull the block guard out cause it ran fine for about a month with it in. Im gonna try and put the thermostat back in and see what that does for me. I'll keep ya all posted.

 

Did u say you only have 1 fan ? I have 2 ... that run ALL the time.... and it keeps things on the cool side.... but i've had 1 of my fans cut out ... and as soon as it does... it starts to overheat..

 

I have one fan but its a larger avermarket one and I have it mounted on the front of the radiator to make more room for my turbo. Its nice being able to have all of that room. Im gonna put the thermostat back in tonight and see if that helps.

 

well i put the a new thermostat back in it and there is no signs of overheating as of yet, thank God! Let this be a lesson to... dont run w/o a thermostat in the car. I will know for sure if its a fix at lunch time today when I get to go out and flog the car around some more.

 

glad to hear!!!!!!!!!!!!!!!

 

Yep, no thermostat means fast flow of coolant and not enough residence time in the radiator.

 

damn block guards.

 

I have block gaurd, NO PROBLEMS with overheating...

People that have overhaeating problems DUE TO BLOCKGAURD usually its because they put them in backwards and RESTRICT the flow of coolant.

Holes drilled in blockgaurd, correctly installed, allow coolant to circulate just fine.

 

back in the day when i had a block guard and thicker headgasket...

what i did was before installing the blockguard, (nuformz) i used a dremel and connected the coolant holes leading to the head... not all of them together... but, connected 2-4 holes together... that were nearby each other...

during the time i ran turbo on the car, i ran it up to 14 psi.... no overheating... ran A/C without problems... radiator cap, radiator, fan, thermostat... all were stock...

 

QUOTE:
I have a blockguard I placed it an inch below the deck no cooling problems whatsover my fan is not even on all the time with this 100 degree weather. I just have a cheap $2 160 degree thermostat from kragen's

thats one of the craziest ive heard yet, one inch beliow? Seems like that would weaken the integrity of the cylinder walls, not to mention, it is usually the TOP where the cylinder often gives, which is why the blockguard goes there...placing it one inch below the top of the block weakens the block where you have strength and doesnt give you strength where it is weak...just an opinion tho.


[Modified by greyzone, 8:38 AM 6/23/2001]


[Modified by greyzone, 8:39 AM 6/23/2001]

 

ooopss sorry thats 1mm below the deck maybe a little less

 

well... the car is still running hot! It wanst the thermostat, and I just replace the radiator cap to see if that will help. my only option left if this doesn't work it to replace the radiator. For some reason I don't beleive it to be the block guard that is causing the problem. I put my head gasket on and all of the coolant holes seemed to line up pretty good. And on top of that I ran the block guard in the car for about a month with no cooling problems at all. hmm...... dam car! Gotta love em!

 

Try using a 16psi radiator cap and a high flow radiator. If that still doesnt work add redline water wetter and use more water and less antifreeze. Hope that helps