Didn't he say spring? Its still winter... Anywho, how much does your car weigh? And what would you guesstimate a street fiero weighing 2800 pounds with driver and 300 whp would run..?
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05:16 PM
darkhorizon Member
Posts: 12279 From: Flint Michigan Registered: Jan 2006
Didn't he say spring? Its still winter... Anywho, how much does your car weigh? And what would you guesstimate a street fiero weighing 2800 pounds with driver and 300 whp would run..?
low 12s high 11s.
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05:22 PM
TommyRocker Member
Posts: 2808 From: Woodstock, IL Registered: Dec 2009
Havent been out to the track because it doesnt open for another 3 weeks or so. They are calling for 5-8" of snow tomorrow, so yeah, I dont have my chain tires for X yet. Also I am having a custom set of axles built by G-Force1320. Might take a little bit to get them back.
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08:00 PM
fieroX Member
Posts: 5234 From: wichita, Ks Registered: Oct 2001
Dietmar door panels...whaaaat? These I've got to see.
Yeah, they are pretty cool. Took a long ass time to get them in the mail but they are going to look really cool. Havent had a chance to paint them yet, but they look good sitting in the parts room at my shop. haha.
Havent been out to the track because it doesnt open for another 3 weeks or so. They are calling for 5-8" of snow tomorrow, so yeah, I dont have my chain tires for X yet. Also I am having a custom set of axles built by G-Force1320. Might take a little bit to get them back.
Yeah this weather is so crappy. Today in joplin it was 70, supposed to be 70 tomorrow then snow saturday and sunday
Possibly a nubby question but what is that black thing with the X on it that's connected to your intake? Is it a plenum? If so that's a weird looking plenum.
[This message has been edited by HausFiero (edited 06-04-2010).]
It is the plenum. It is not what you are used to seeing because the intake runners are almost non existant. That type of intake manifold is made for lots of high rpm air flow which fits the big turbo perfectly.
Originally posted by Doug85GT: That type of intake manifold is made for lots of high rpm air flow which fits the big turbo perfectly.
Its proven to hurt power, by a fairly large amount. Its a "non runner" type intake, its just a giant open area.
Guys that swap to the proper equal length medium runner intake, pickup 20+whp at the same boost levels. With a revised version of the medium length runner intake to a long runner holden intake, zzp was able to pickup 38whp in their race car over this style intake manifold.
I took my turbo GTP over to zzp last summer and changed intakes around on the dyno, and generated this. fierox is using the "m90 with blockoff plate" style intake right now.
[This message has been edited by darkhorizon (edited 06-04-2010).]
Its proven to hurt power, by a fairly large amount. Its a "non runner" type intake, its just a giant open area.
Guys that swap to the proper equal length medium runner intake, pickup 20+whp at the same boost levels. With a revised version of the medium length runner intake to a long runner holden intake, zzp was able to pickup 38whp in their race car over this style intake manifold.
I took my turbo GTP over to zzp last summer and changed intakes around on the dyno, and generated this. fierox is using the "m90 with blockoff plate" style intake right now.
It all depends on the engine, turbo, exhaust etc. Unless you have an identical setup to FieroX's, there is no guarenty that such an intake would net more hps on his setup.
The general rule is that shorter runners = higher rpm power. But, in this case, it is paired up with a pushrod engine that was originally designed to make low to mid range power. So it makes sense that medium length runners might be better. Also, FieroX's plenum looks small for the engine displacement and the size of the turbo pushing air into it. His engine may benefit more from having a larger plenum than having longer runners. A general rule of thumb is that the plenum should be at least as big as the engine displacement. With a small plenum, the air may be travelling too fast through the plenum. High velocity = lower pressure. You want higher pressure at the valves pushing air into the cylinders. Also, high velocity means that it does not change direction well and may be causing inefficiency at higher rpms. With a larger plenum, the air will slow down after the throttle body which will allow it to turn 90 degrees and enter the cylinders easier.
With the medium length runners, the total volumn of air after the throttle body is larger. So the air inside the intake manifold is not as turbulent and can move at a lower velocity through the plenum. It would not surprise me if increasing the plenum volumn increase hp the exact same amount or more than increasing the runner length.
All of this is just my ametuer analysis and opinion so take it with a grain of salt.
Anywho, how much does your car weigh? And what would you guesstimate a street fiero weighing 2800 pounds with driver and 300 whp would run..?
