levels of boost
Turbo Mini Forums

What is a maximum safe level of boost on a standard turbo cylinder head?

If in Doubt, go flat out !!!

if you use a good standard turbo head along with 25cc pistons, it'll probably happily run 30+ psi.


A vague answer to a vague question i'm afraid.

sorry for being so basic in my question, im using standard pistons and a standard head with a t2 turbo.i just didnt want to turn up the boost and do damage

thanx juffer b

If in Doubt, go flat out !!!

well, the metro was 7psi using 98ron fuel.

If you use the best fuel you can find, have it set up on a RR, you might well find that with a just enough ignition retard, 10psi will just about do.

Yes hoggy is the best to ask on this one as he is running a standard head on his 1380 so it's even higher c/r.

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if you are running std pistons with std head i suggest you remove the beak out of the combustion chamber

this together with an intercooler will give you a margin of saftey

remember the intercooler is not the icing on the cake its MORE cake as one top turbo expert quoted

yes i ran 10 psi on 9.8 cr with a intercooler with a fixed advance set at 24 deg.

with no det problems at all although my rr guy was using det cans just to make sure.

the car loved the tescos 99 ron fuel as well so all helped and did make for a nice drive.

but how much safty margain i had well i will never no but it should be posible to run say 11psi with the same set up as you with my above mods as long as its set up well on a rolling road as you only have 9.4 cr but you are sailing pretty close to the wind so be carefull

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