what is kinder to the standard UK internals 350 bhp at say 1.5/1.6 bar of boost or say 380 bhp at say 1.3/1.4 bar of boost (turbo dependant)

 

Standard UK pistons or rods will not take that power [ either 350 or 380 ] for very long in my experience. Rods are distinctly unstable above 320 / 330, at least the big end bolts and studs are. But the rods with better bolts etc aren't a good bet anyway.

David API

 

Steve/David

There are a number (10+ that I'm aware of) of std internal UK and WRX cars out there running 380+ bhp without issue, one common theme is that they are all running a bigger turbo which keeps the internal pressures and temperatures down in comparison to screwing the guts out of a small turbo. Typically 380bhp is achieved at 1.2-1.3 bar. They are also observing the original rpm limit.

I guess that David not having seen them is a good sign

If the maximum revs are controlled, the rods will be fine and if the tuning is correct the pistons will not overheat or be damaged by det.

Andy

 

well mine is running the 1.6 bar as stated above with no problem and im going to try a different turbo to run less boost, ive been told the lower boost is safer to the engine the person im getting the turbo from has over 400bhp on standard uk internals plus i know a few peeps sitting around the 400 ish figure with no probs on standard internals

 

Good luck guys

 

hope luck isnt what i need

 

May be a point here if it was used on track for considerable periods of time, but in short bursts (which is what tends to happen on the road) I don't think there should be too much of an issue.

Maybe i've been lucky, who knows, but compressions are still the same, no smoke and catch tank has barely enough oil in it to cover the base and its been in for many months now, but as Andy says less boost must surely be kinder to the internals?

 

alan i never track my car and it isnt a daily driver, plus my car car very rarely gets its full boost as my lass has meniere's disease which means if i boost my car when shes in she,ll be ill for days, so mine is a very safe car

 

any enigine/gearbox can go at any time.....IMHO, so in a way, it is down to luck.