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Alum Flywheel - HELP

1077 Views 9 Replies 4 Participants Last post by  gt-38
Anyone have exper with using Alum flywheels on 5.0? I just put a Alum FW, New clutch and Alum D/S. It feels like I've lost 1/2 my power.... I understand the rotating mass concept, but It seems to me the car should at least accelerate hard, then drop off between shifts, but this thing is dead across all gears and RPM ranges.

One note-- I did also replace the stock exhaust with a set of BBK equal headers and a BBK off Xpipe- The X pipe doesn't reach the flowmaster muffler pipe on one side I have to get a shop to modify.. So maybe the lack of backpressure???? One side of the X is bolted up the other isn't.. The power loss is so drastic, doesn't make sense to me


Please send help.. This is the project from hell (Theres more weired stuff for later) :sosad:
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Thanks for your suggestions. I ended up leaving the Xpipe on. I was able to get the pipes in place correctly with a sleeve. I may go back to the cats, I have lost lots of low end power, but have more power in the higher RPM ranges.

One other thing I overlooked is that when I rebuilt the trans I changed the cluster gear ratio and first from 3.55 to 2.95. I've only had the car for a few months I haven't checked what ratio the rear is, but I know its not stock. Maybe lower gears in the rear will compensate for the gear change in the trans. The reason I changed the cluster and first gear was because first was to low and overall highspeed crusing was horrible, turning to many RPM at 70-80MPH.

Not sure what I'm going to do next-- Have stock TB and Intake, maybe I need more airflow?

thanks again
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I do have the 295 first, which is a big improvement...

I bought my rebuild parts from Hanlon Motorsports they were very helpful they even sell a step by step how to video. D+D has lots of stang trans parts as well

Well I've been on the road for a few weeks now. I'm liking the changes, just have to drive a little different, the loss down low has been replaced with a decent mid and much stronger topend. Pulls hard from 80-100. I think once I add more power it will be even better. Heads, Intake, cam coming up next...

Anybody have an opinion on the new BBK SI intake? :worship
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