Outer Limits 4x4 Board

For those guys with a turbo petrol, (mine is TB42) running on premium unleaded.
what temp do you see cruising at 100 and under full noise?

Mine is dyno and road tuned with fuel and timing set very well but the exhaust temp seems high, The pyro sits about 5mm from the V-Clamp and reads about 550c at cruise and up to 750c fully boosted (8psi).

Just seems a tad high, but I have always been around deisels not petrols.

Oh and we also checked on the dyno the egt on the turbo housing with a hand held spot meter and it was same as gauge.

i've never had one on my turbo petrols. it would get to scary , i used to run 25-30 pnds boost.

petrols do run a fair bit higher than diesels.
cant comment directly on your motor but i wouldnt think thats too bad? full noise seems alright, cruise seems high, but again, i dont know what you would expect.
i know they should be more stable than a diesel, hotter but more consistant.

cheers, andy

i dont know if gas and petrol temps are close to each other but i have a gas turbo 7psi running through it and have around the same figures as you

lol, I don't think anyone with a petrol turbo'd car even bothers or knows what a pyro is.

I've asked a guy (guage shop) at autosaloon about a pyro for the diesel and he had never heard of them and triple3 do BMW's etc only the jap boss knew what they were and said they are pointless on a petrol only good for diesel as he thought I was asking to put one onto a petrol car.

I'd hate to see what the 1000+hp cars are doing pyro wise.

so long as your AFR's are right, the temps shouldnt be out of hand...

That's fine, you think thats hot try your pyro in front of the turbo. Keep this in mind, a catalytic converter needs to be around 600 degrees at cruise too be hot enough to work. Late model engines intentionally run at 650 degrees at cruise. I've done a lot of pyro tuning on Outback Challenge cars that run under boost for sustained periods, we adjust the mixture to keep safe temperatures even though it is below peak power. Drag cas that do brief bursts can be run leaner as it is the heat over time that wrecks things.

Cheers

Joel

Thanks Joel, I was hoping you might reply to this thread.

Its funny not many people know temps on turbo petrols, diesels are a
different story but you mention petrol and they shrug their shoulders,

Thanks again. Kent.

Because its a different ball game, petrols are measured in afr's rather than exhaust temps like diesels. If the afr is right the temperature is right.

berad wrote:Because its a different ball game, petrols are measured in afr's rather than exhaust temps like diesels. If the afr is right the temperature is right.

You can apply exactly the same principle to a diesel. If the charge temps are under control and the AFR's don't go past a certain limit (richer than 20:1 could be a concern, 18:1 would be a concern), then you don' need a pyro.

But only the later electronically controlled diesels have a clue what AFR they're actually running at, for mechanical diesels it's easier just to stick a thermocouple in than to monitor AFR's directly.