Stock airbox intake flow (pics)

[Hasbro]

Originally Posted by Topless

Underdrive pulley- Verified 3-5hp gain to the wheels across the RPM range by reducing parasitic drag.

Weight loss- Verified improvements in acceleration, braking, and cornering.

Plenum- Combined with TB, exhaust, and custom software tuning- 10-15hp depending on model with more improvement on the 3.2L.

Airbox- 987 box performed the best gaining 1-2hp on 3.2L

I'll put this here instead of a new thread as it is somewhat applicable. Care to comment on my plans on a 2.5 base? I'm thinking maybe +10 whp?

- Underdrive pully - check.

- Lightened flywheel/clutch? - In a nutshell, Raby said the 2.5 could handle this the best. Is there such a thing as a lightened dual mass flywheel?

- Weight loss- -367 lbs. (2,455) so far. Goal around 2,350, including weight added back on (structural stiffening and body work/aero).

- TB, software?, exhaust (headers, 2 cats, no mufflers (for weight loss) - still need the headers. Will I need 2.5 specific headers? Would Pedro's system work adequately with the semi-custom software? Alternatives; rolling dyno plus? I'm looking for a broad range torque improvement, not 6700 rpm hp. This is more of an auto-x/street car than track - built for fun and don't care about being class competitive.

- Manual steering.

- Re-working of body/drag but I'll leave this alone for now but it will reduce the hp required to go x mph.

[Topless]

Originally Posted by Hasbro

I'll put this here instead of a new thread as it is somewhat applicable. Care to comment on my plans on a 2.5 base? I'm thinking maybe +10 whp?

- Underdrive pully - check.

- Lightened flywheel/clutch? - In a nutshell, Raby said the 2.5 could handle this the best. Is there such a thing as a lightened dual mass flywheel?

- Weight loss- -367 lbs. (2,455) so far. Goal around 2,350, including weight added back on (structural stiffening and body work/aero).

- TB, software?, exhaust (headers, 2 cats, no mufflers (for weight loss) - still need the headers. Will I need 2.5 specific headers? Would Pedro's system work adequately with the semi-custom software? Alternatives; rolling dyno plus? I'm looking for a broad range torque improvement, not 6700 rpm hp. This is more of an auto-x/street car than track - built for fun and don't care about being class competitive.

- Manual steering.

- Re-working of body/drag but I'll leave this alone for now but it will reduce the hp required to go x mph.

Weight loss and UD pulley are a slam dunk. Intake/exhaust/DME software are a moving target and best done together with a custom dyno tune. I don't see much benefit in any off-the-shelf flash unless it gets further tuned to your specific car and mods. Everything needs to work well together and then you can find some hidden HP.

A lightweight flywheel was on my brother's 2.5L car while mine retained the dual mass. It definitely spooled up faster and was a little quirkier to drive around town. We never dyno'd B/A this change and we noticed no difference in lap times. He was usually a bit quicker on tight tracks and I was quicker on more open tracks, always within a few tenths.

The only benefit to me for manual steering is a little weight loss. The PS pump is very reliable once the UD pulley is installed.

Good luck and test/verify as you go!

[Fiddlebog]

For manual steering, is anything needed to be done to the rack, or just remove the pump and lines?