Found my HP problem

[Ccmano]

Thanks for the input guys. As we know not all dynos are equal or accurate for that mater. I suspect this one was not real accurate. In this case, same day same dyno, karterdon put down 358/349 on his 91'. He has similar mods but no headers and is using a full Corsa cat back. So this gives me a point of reference. I have headers and the modded Corsa, but only 10 more HP?

As for my mods, I do not have any head work other than port matching the IH's and the cams have not been timed. Based on several other cars I've seen numbers on, with the same mods, I should be in the 385 to 395HP area.

Paul can you give me the dimensions of that magnaflow resonator you have? Length, width, height and most importantly what is the center to center distance of the piping going in and out. Thanks

H

[LGAFF]

Check this site for options:

http://www.magnaflow.com/02product/u...asp?shape=oval

[LGAFF]

Wonder if this glasspack resonator might work: http://www.classicchambered.com/classic/products.html

[Ccmano]

Paul,

Is that Magnflow resonator out of a Kit or is it just a standard Magnaflow part?

H

[-=Jeff=-]

Originally Posted by Ccmano

Paul,

Is that Magnflow resonator out of a Kit or is it just a standard Magnaflow part?

H

his is the one out of the LT4 kit.. Same center section Dominic has on his car

[Paul Workman]

Sorry it took so long to get back, but "duty called", and I had to go in to start one of the crews this morning. (Y'all sleep in WAAAAAY to late anyway!!)

But, Jeff is right: It is part of an LT4 kit. I kept the mufflers (installed yesterday), but I was looking to "go for performance" first, and then back off (if necessary) for ride comfort. (Right now it has the SWs w/ 3" outlets to a SW X (more like a "merge") pipe to Magnaflow links and mufflers. I need the assistance of someone that can cut and weld stainless tubing so as to install my "Power Stick" "resonators"...Al? Whatcha doin' buddy???.)

P.

[XfireZ51]

Hans,

If you do decide to try the MFlow system, I'd suggest going to Twisted Pipes. It will take a little work to match the header collector to the
X-pipe, particularly on the passenger side, as there was a slight offset with the Watsons I have.
As for dynos, I week before Bowling Green, I went to Street Stuff and dyno'd the head porting and headers I did. 385rwhp. In BG both Don and I put ours on and I dyno'd 370rwhp. SO to your point re: dynos.
My first suggestion would be to dyno the car as is at a known shop and scan it to eliminate other factors being the culprit for your power loss.
We could even look at tuning it to see if output could be optimized.
Then I'd look at addressing the exhaust if it still isn't performing to expectations. My $.02

[LGAFF]

I would say the 2" stuff needs to go before going to any dyno, think tf95ZR1 could chime in, I can't recall what he picked up when he dumped the Borla resonator but if I recall over 15hp...and it necks to about 2.25"

[XfireZ51]

Originally Posted by LGAFF

I would say the 2" stuff needs to go before going to any dyno, think 95ZR1 could chime in, I can't recall what he picked up when he dumped the Borla resonator but if I recall over 15hp...and it necks to about 2.25"

I would disagree because I believe you would want to establish a benchmark you can measure against as needed. The one in Antioch
wouldn't be something I would depend on replicating. I'm not disagreeing that the exhaust could represent a restriction, but is it the only thing? Is it responsible for 15-20rwhp? I don't think any of us knows that at this point.

[rhipsher]

Personally from my own experiance going from the Borla resonater to straight 2.5 dia pipes in place of it I didn't notice any difference at all in power. At least nothing I could physically feel. Of course I still had the Borla mufflers on it. There was no resonence running with straight pipes. But the exhuast tone sounded like crap and I couldn't wait to put the Borla res back on. Maybe and X pipe would have made a difference. I don't know.