Possibly could be the radiator but if I am not mistaken Charles has an aftermarket radiator. Some of the early 300zx TT iron blocks had coolant flow problems to one of the rear cylinders that would lead to overheating and failure under high boost applications. Many of the high end builders would grind the passages out to improve flow on those blocks. From looking at the aluminum 350Z block I don't see that being an issue. I have an idea!! I think it could possibly be some trapped air in the coolant system which is being superheated and with the increased rpm's, load, and coolant flow the superheated air pockets are being released..... which would mimic a headgasket problem exactly!! That may explain why Charles' problem went away.

 

I was going to get the timing maps stabalized also with my l-spec but never did. Sharif did this, but I recall reading that the most conversative map they copied to the other two maps was way to convervative. Can you add timing with the emanage if the ecu is taking out too much?

 

Only timing removal with the e-manage if I am not mistaken.

 

That is correct. Instead, I would suggest that you ask TS to copy their Greddy timing map into all three maps. The Greddy map has roughly 18 degress of timing at WOT, which is close to perfect. You can retard a couple more degrees at the trq peak via eManage.

 

That is an EXCELLENT observation. I recall when I FIRST installed my turbo kit about a year ago, we had some bubbles in the cooling system, and went for a test drive. Upon return, guess what, the overflow tank had bubbled over. Your theory might hold some water (no pun intended), in that air trapped in the system can easily overheat the engine, result in very high cooling system pressure.

And the 350Z cooling system is notoriously difficult to purge of all air.

 

funny you say that, i had a conversation with my tuner yesterday, he said the exact thing, they are flushing my coolant again to see if that is the case!

 

I have flushed my coolant several times, my heat blasts hardcore at idle... i have definatly got all the air out of this car. I took it out last night and the problem is still there at higher boost.

I believe it to be a combination of head lift and poor deck surface. I will be pulling my engine out to fix it very soon now... I have a full shop right now but every car here is super close to being done.

-Charles

 

hopefully me and ernie just have air---we have not flushed out several times...good luck to you charles!!! ernie was very impressed with your meticulous tuning stragedies!!!

 

i actually meant to say bled rather then flushed... but yea you get it.

 

Sounds like the head may be lifting under high cylinder pressure. This is a common problem on turbocharged bikes and it may not show up on compression or leak down test. The symptom is often times is that it runs fine off boost but under boost allows compression gases into the engine water jacket thereby overflowing the container. If the engine uses a tri-metal gasket the deck and head sealing surface finish is critical and requires special care that some machine shops cannot or do not provide.
Take a look at this -
http://tinyurl.com/5n89u

 

informative link--i'm still betting on the air in the system theory--i don't want to pull my motor for at least 5 years

 

re: http://tinyurl.com/5n89u
I've done this (grinding). Blanchard, Surface, Jig, etc.

Grinding aluminum is a b!tch.

I hope this isn't required.

 

Let me see if I got this right....you are throwing white smoke from your exhaust???

 

looked white at night, darker in daylight-smell distinct oil

 

if it's kinda bluish and smells like oil then it's the turbo seal.

 

My son got a 13.4 in Albuquerque with slicks on a basicly stock SRT-4...He is in the Blue car...

 

No doubt about it, that trap is good for a solid twelve. But don't be so quick on the 11's let alone a low 11. Let me tell you from 1st hand experience a 11 is very diffulcult to run at Albuquerque Dragway, when and if you do so will be cause for a major celebration, but frankly, I would like your chances alot better at a better facility.

Bill Ross is running low 11's in his Cobra and trapping in the 130's. If you raced him it would be a ugly loss for you.

Anyway, I am sorry to hear about whatever this latest issue is and I hope you get it resolved quickly.

 

thanks, i'm having both turbos rebuilt stronger- they will be done by wed/thurs...car should be back this friday...


as far as the times...i think i can get my trap to about 125 or so...we'll see what happens, i'm not gonna push it w/ drag radials until i get the upgraded axles that i ordered...i'm trying to minimize downtime due to breaking parts!

TODD

 

Good idea on those upgraded axles, at this power level, several wink links may show their ugly face...