RKD in OKC

My temps were the same with both a K27/8 and a Super61.

toddk911

So if you take that 100 degrees off you are about 1550-1600, which is right in range.

ross255

toddk911, yes if Lausts figures are right, which I have no doubt they are, then yes 1550-1600.

marcoturbo, yes I have the vitesse chip board with MAF, running normal maps (ie plug to enable race maps removed)

fast951

When people want to run high boost on pump gas, the ignition timing must be retarded, which leads to higher EGTs. A bad AFR will also affect EGTs.

Some of this was discussed a while back Here

sly_alex

So today I do some test with only 15 psi boost (always maxhp eprom, no time to test guru eprom).

I make runs stop to gear 4 until 6000 tr on each gear, the temp was 986°C (1807°F) ;-)

The temp was still going higher but very slowly, and I can't test on gear 5 (not enough place)

I will test guru eprom next week ;-)

DrRon

FYI Here is our EGT :

probe in x-over, Super 61 turbo, 12.2 at WOT, Guru chips: about 1650 F (900 C0 during racing conditions, with prolonged flat out. Not rising.

986C looks very high to me.

rberry951

At the risk of being redundant, there's some good posts on EGTs on another thread not too long ago Here. I say redundant because some of the people that posted there have posted here as well.

sly_alex if you have oil consumption and it's not all coming from your ailing turbo I think you should do a pressure test on your cylinders. If part of your oil consumption is burning you might be at risk of burning a valve, or worse.

Regards,
Russell

sly_alex

Thanks for the link, but I've already read

Like I wrote, the engine and the turbo are near to die


But I'm preparing a new 2,5L with a new big turbo (super 75), so on this engine I'm testing some sensor and peripheral things

The stock O2 sensor does not show significant numbers... so I'm trying to find which number on egt I must read on my car to prevent turbo and engine damage.

Russel do you thinks does oil consumption can explain my egt numbers ?

Thanks

rberry951

No, not directly. But the problem could be related to high exhaust temps, and the byproduct of another issue. If your turbo is leaking a lot of oil into the system then that is where your oil is going. And if so, the turbo could actually be binding a bit and introducing excessive heat into the system, proportional to the boost. As you state at little boost (10psi or so) the EGTs look fine. Higher boost, more work/heat from the ailing turbo, higher temps.

But if it is not really in that bad shape, the oil is going somewhere else. Possibly you have a failing head gasket, or rings. But either of these conditions would most likely introduce smoke to the equation. If there is no smoke, and high oil consumption, back to the turbo. If the compression test shows you have bad compression, that equates to bad AFR under boost which could cause high EGTs and other issues as well through the overall engine efficiency being compromised. I suppose a better question would have been "how much oil is being consumed". Oil consumption on these cars is a given. Normal oil consumption of a 951 often seems excessive to someone not familair with the 951. I don't know how familiar you are with the car. The actual consumption rate may be normal for the car. But if it is indeed burning/consuming a lot of oil and the motor's overall health is bad, you're not really accomplishing anything trying to perform tests like this on it to compare against a healthy motor, as your high exhaust temps could very well be simply because the motor is unhealthy. Your test would be better conducted on a healthy system.

Regards,
Russell

toddk911

Russell, does 1800 not see WAY too high?????

toddk911

Or I guess my question should be where you map your chips' EGT's to be at full boost?

rberry951

Pushing a K26/6 at 18psi, yeah, it's a little high. It is going to be high.

It's also a little higher because of the ailing engine and turbo. If you measured yours at 18psi it would be in the 1500s.

Regards,
Russell

toddk911

Ok.

ross255

Is there any reason that he still gets the same temp at 15psi then

rberry951

Ailing motor and turbo would be my guess.