I hate to say it but over spinning is the nature of the game for most people. I've actually experienced better blower efficiency with impeller speeds much higher than recommended with no adverse side effects. We spun my old X Trim well over 80,000 and never had an issue. It seems that the efficiency is more in line to the compressor maps once you start getting into the billet wheel blowers. Keep in mind that I have personally been testing blowers for Vortech for quite some time and will be at PRI with them in December out in Indiana.I would look for combos on the internet and see what you think is reasonable. Watch out for the over spinners. Lots of people just set up the pulleys to spin the crap out of it which can lead to problems for your engine. See what people are making with the Vortech recommended range.
Kurt
You are correct to an extent. As long as you have a way to compensate for that additional heat then there really isn't a problem. This is via a tune that changes timing based on those higher iat values or some form of mechanically cooling the air. The guys in renegade have been over spinning the YSi's for the better part of a decade with insane iat's and don't melt motors down or a regular basis. They are not allowed to use and sort of intercooling device but to the best of my knowledge Bart Tobner still managed to go 8.16 with a YSi non intercooled and was able to back it up and that was a year or two ago. It's one of those things that's either right or wrong and without the right experience most people that are newly introduced to large amounts of boost have a learning curve and that's just the unfortunate truth.I guess I should admit there are different degrees to over spinning it. You always have the guys who spin their S-trims to produce 24lbs of boost and then melt all the pistons. There is a line between pushing it a little harder and just being stupid. The impellar has a certain range of efficiency recommended or not. If you exceed the limit, it's going to produce way too much heat.
Kurt
Hope that's an aftermarket block lol!Brother-n-laws car: 331, afr 205, systemax, non inter cooled t-trim at about 17lbs (I think). 602rwhp.
Joe
The guy selling the t trim wants 2250$ for it with all the brackets,pulleys,belt,power pipe,etc. right now it's pullied for 17# boost and his car runs low 10s. Never had it Dynoed. It sounds gooood!! Runs hard in my test drive at least. I might just buy this. Does anybody think that's a reasonable price?
Hope that's an aftermarket block lol!
Yes and no. It's a FRPP B50 block. Not built for that type of power. Like many of us, his HP desires grew too quickly, but he rarely drives the car, sees very little run time.
Joe
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