Quote:
Originally Posted by Can'tHave2MuchHP
I would trust Matt too. But I don't think he would have you put a 2.30" upper and a bigger lower pulley on stock cooling/stock cam. Or he did and that meth is the crutch for your setup. Again, 18% overdrive puts these blowers at over redline or the recommended max RPM or 22,000. I think a 2.30 alone may be over 18% and most lowers only come in a minimum of 9% overdrive. You sure he put a lower on? I don't have the time to find and copy the info but if you search there's lots of reasoning behind pulleying the LT4's 1.7L Eaton. Over spinning and your car will pull timing even if IATs are in check.
And yes those numbers are really good, on a normal pulley setup with meth most should hope for a max of 680 RWHP. Without Meth, 630. Some with E85 and ported blowers have hit 700 RWHP. But I've never seen as high as 722 RWHP without opening up the engine.
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The 2.30” blower pulley is somewhere around a 9% increase.