I wasn't thinking of revving past 7500, I was thinking of being comfortable revving it that hard. 7500 / 7800 is probably as far as I would ever need to go on any spec YB. I don't think the strokers need to be revved hard but think my new engine may have been mapped up to 7800??? Will need to check the graph.

I do not think I would be comfortable revving a bog standard engine much past 6800 on a very regular basis or for sustained durations / hard track use on a 20 plus year old crank with 500+ bhp, it is a highly stressed engine. I know plenty probably do though.

I am sure Mark Shead can comment but I think the turbo can hold 1.8 to 2.2 Bar at 7500 with the right spec engine. Surely you would not need as much boost to make the same power with a well ported head and correctly specced cams?

I think 800 bhp on here is expecting that his new engine with the new head will make a little more power with less boost and better response.


Am I right saying that most turbos could cope with an engine at 10,000 revs if they were only being asked to supply under 1 bar of boost?

Agreed on the Stroker, we are unsure at this point if the 7064 will hold power later in the revs so it is likely we will be upgrading it. It may well struggle to hold 500bhp at 6000 rpm... We are yet to see one this small on a stroker at this level although Mark has done a similar Evo.