View single post by Tsquare
 Posted: Thu Nov 23rd, 2017 01:55 am
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Joined: Fri Nov 10th, 2017
Location: Suwanee GeorgiaUSA
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The Eaton M90 came in more than just the T-bird. GM also used it with their 3.8L in Buicks and Pontiacs. The M90 can be tuned to run up to 15 psi as many people who had Grand National's found out:cool:.

There is a lot of info out there on the M90. At a low psi like 3.5 lbs you are not going to see much increase in power but you will see an increase in fuel consumption. The extra power the blower is generating will be mostly eaten back up as the drive requirements of the blower. If you could run 6 to 8 lbs you would see a big jump in HP/Tq but it's economy wouldn't be that much worse than the 3.5lbs.

Another big problem is that Ford's hypereutectic pistons are cast. Even shoot as little as 3.5 lbs the cast pistons are not going to last very long. A short block with forged pistons at a bit lower compression (8:1-8.5:1 instead of the stock 9:1) would be ideal for making a lot more power efficiently but you are starting to look at a lot more $$.

'04 XLT regular cab 3.slo stepside
Came out of retirement to drive a school bus - I have lost my mind