Factory header tubes

[RPM - Robert]

https://fjowners.com/index.php?topic=21401.msg216495#msg216495

I hijacked this other thread already but we should have it in the dyno sometime next week or the week after to get a final tune in it and hit the track for shakedown in August 10th before the couple of competition events we are running

[captaudi]

And I thought the full forged turbo motor I built for my son's Miata was zippy at 24psi. That's a whole nother world!

[RPM - Robert]

Originally it was a 1.6 turbo motor making 450 to the wheel at 30PSI on e85.

Then it was a LM4 5.3l with a 88mm turbo running 30PSI and making around 770-780HP to the wheel on e85. Can't find the dyno sheet but its in there.

We had an early Holley HP and it ran out of inputs for wheel speed sensors and what not to control boost per gear and traction control etc. So we went back NA with the LM4 it made 370HP with a ford 8.8" IRS rear.

We wanted a Wincters quickchange for easy gear changes for all the different size tracks we run. We we put the quickchange in it, the HP dropped from 370 down to 330 to the wheel. So then we went 6.2l LS3 make 470 to the wheel but now we are getting more serious into time attack we need more power. Got a decent deal on the LS2 with all forged internals and solid roller lifters but it was serviced out from the 427ci so we punched it out to 454ci and bumped the compression up.

Not the old engine builder but our neighbor who tuned the motor before our rebuild brought this over this afternoon. No info on the cam that was in it. (Didn't have a cam when we bought it), he thinks it had a Holley Hiram intake on it. Red is all motor blue lines are with nitrous.

We will be running all motor so piston to wall clearance is a bit tighter since we don't have to accommodate for the nitrous. Having a cam over .700 lift , along with  bumping the displacement and compression ratios up. We are hoping to see 700-750rwhp maybe 570-600 fr lb torque. He has some dyno time coming our way next week or the week after for some horse trading we did. Fingers crossed!