I recently aquired this

Im rebuilding the spare bottom end that came with it to replace the knocking bottom end currently in it. When its fitted ill be getting it set up on the rollers and im just wondering what sort of boost is advisable for a standard bottom end. Apparently its running 18psi at the minute at 197BHP. He was told he could run it at 23psi and get somewhere around 240BHP which sounds a tad on the limit!

Spec is chipped ECU, scorpian exhaust system, polished and ported head, piper BP285T2 cam and a pace double capacity intercooler.

im not a rive arse in a car and only use it about once a week so high boost shouldnt be a problem i dont think.

Im just wanting some oppinions please

Cheers.

 

What kind of turbo if its standard it wont last long at that boost if it is.
Also would imagine you would start to run into fuel problems too at 23psi and could do with a 5th injector.

 

I dont want to run it at 23psi im just saying what he was told. im just wondering what a safe boost is on a standard bottom end? Its running a standard T3 at the minute but in having a stage 2 T3 rebuild for it at the minute

 

They all seem to differ, that would seem very excessive boost to me. I ran 18psi on a standard bottom end and made 199bhp at the flywheel at a rolling road day at SCA in Norwich.

In saying the boost sounds excessive we did get my brothers 100k mile bottom end running 21psi peak and holding 19psi but it was my good mate Rob that set it all up for us and it was only done as we didin't care how long it lasted as we had a big build planned. Incidentally the engine never did fail and we got bored of waiting so just pulled it out for the rebuild after 18 months of abuse

 

Is 18psi that im currently running safe though? or should i go a little higher or a little lower? that is the question

 

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The Pace double capcity intercooler will be on it's knees at 18psi. That's what I was running and teh operater said the ACT's were off the guage . A bigger intercooler would allow more bost but with what you have I wouldn't want to run much more than 14.5psi (1bar)

 

I suppose ill have to wait till its on the rollers as they will set it to its optimum boost

 

It's not the boost that will kill your bottom end it's BHP/RPM, but if I were you once i'd fitted my rebuilt bottom end i'd have the boost as low as it can go until I had it setup! Just to be safe!

 

it wil be going straight to be set up.