Horsepower in stages question.

[Vette73]

Went from stock on my 91 to headers and exhaust and Haiback chip...Few months down the line I had the plenum, I/Hs and air horn ported by Pete, 36 mm.......At each stage I felt a definate increase in power....

Right now I'm 382 RWHP......I'm thinking of porting the heads to 36 mm , Fidenza flywheel, secondary delete, and cams degreed.....

Of course this final step is the most costly due to the time and labor involved....My question is - by doing the " final stage" so to speak is there a significant increase in power and seat of the pants feel? Anybody ever did there mods in stages like I have? If so, was the final stage of porting the heads, degreeing the cams and adding a Fidenza flywheel worth it?

Thanks.....

[XfireZ51]

Went from stock on my 91 to headers and exhaust and Haiback chip...Few months down the line I had the plenum, I/Hs and air horn ported by Pete, 36 mm.......At each stage I felt a definate increase in power....

Right now I'm 382 RWHP......I'm thinking of porting the heads to 36 mm , Fidenza flywheel, secondary delete, and cams degreed.....

Of course this final step is the most costly due to the time and labor involved....My question is - by doing the " final stage" so to speak is there a significant increase in power and seat of the pants feel? Anybody ever did there mods in stages like I have? If so, was the final stage of porting the heads, degreeing the cams and adding a Fidenza flywheel worth it?

Thanks.....

I have news for u, it's not "the final step". :dancing:dancing:dancing

[G8nightman]

Lol thats just the tip of the ice berg before it really starts to hurt your wallet...

[Vette73]

Lol thats just the tip of the ice berg before it really starts to hurt your wallet...

lol...Yeah I hear you...The "Final step" before cams
Added displacement and such.....Just wondering if any of the members
Did it in increments and when the head porting was done did it make
A difference.??

[XfireZ51]

I think I have a dyno chart showing 3 different stages of mods.

[efnfast]

I did mine in stages. Cams just arrived the other day. When they go in, the heads will also get ported. Between the heads and cams, I better feel a differance, I'll let you know.

[Vette73]

I did mine in stages. Cams just arrived the other day. When they go in, the heads will also get ported. Between the heads and cams, I better feel a differance, I'll let you know.

You should def feel the difference.....Heading out early tomorrow to Dempseys shop.....He's about 255 miles from me.....We been kicking things around over the phone for a few weeks but nothing like getting the feel for the shop and talking face to face....

I met Dempsey at Carlisle and he came across like a stand up person so would like to give him my business.....Seems to have a wealth of knowledge with the LT-5....

[XfireZ51]

Comparison of dyno results for power increases achieved in stages.


Green Line -Top End ported + Fidanza w headers Tune by Dominic

Blue Line - Addition of Pete Intake Cams + GVD Ported Heads Tune by Dominic

Red Line -Addition of Pete Exhaust Cams Tune by Dominic

[Vette73]

Comparison of dyno results for power increases achieved in stages.


Green Line -Top End ported + Fidanza w headers Tune by Dominic

Blue Line - Addition of Pete Intake Cams + GVD Ported Heads Tune by Dominic

Red Line -Addition of Pete Exhaust Cams Tune by Dominic

Hey thanks so much for info....

[efnfast]

My results to date:
Stock - 311 RWHP
Headers, exhaust, chip - 353 RWHP
Ported plenum and IH, chip - 397 RWHP
165 thermostat, 15 pound flywheel - no new dyno.
Next, cams and ported heads. And a custom tune.

[Paul Workman]

My results to date:
Stock - 311 RWHP
Headers, exhaust, chip - 353 RWHP
Ported plenum and IH, chip - 397 RWHP
165 thermostat, 15 pound flywheel - no new dyno.
Next, cams and ported heads.

Yup! Those #s pretty much track mine, up to the point where the heads were also ported. At that point the Fidanza FW was also installed, netting 432 rwhp.

In the future (late this winter??) I'd like to tweak the porting (TB) and the exhaust, AND add cams; the goal being 455-460 rwhp at that point.

Stay tuned!:)

[efnfast]

Paul, hoping for the same when the heads get done.