Thread: 7.5 CR pistons?
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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
You already have a lot of good mods so I expect you are running 1 bar already.

If so, w the bump in compression to 8/1 you would have to give up about 30hp on the top end from pulling back boost to .8 bar to improve the bottom end response some 5-10%.

I think bumping the base compression lowers how much boost you can run by about 3.7 lbs for each point of compression per one resource.

Thus, SC cams and larger intake ports to increase the VE would recover the HP traded up top would go well with your plan.

However, if you are on the edge as to max fuel delivery, pulling boost back a bit and increasing your aveage HP w the compression bump would be a good fit.

If you are just looking at going to 7.5/1 CR there are other ways to increase low end response like cam timing, an ignition strategy, Synapse BOV, D-WUR, and /or lower R&P.
Old 12-07-2009, 09:09 AM
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