Flowmasters

[Hib Halverson]

I'm sorry, folks....I forgot to answer this:

Originally Posted by Aurora40

Right, I mean an unmodified single inlet. I assumed it was bigger than 2.5". Is that the size where the single inlet hits the resonator?

Unfortunately, I don't know the exact size of the Flowmaster resonator inlet but I'd guess it's 3 in.

[Z Factor]

Originally Posted by Hib Halverson

I want to make sure I understand the above because it's just as amazing as 26hp at the wheels from just an exhaust....are you saying your car, which currently has a stock exhaust, makes 409 at the wheels after porting the injector housings, porting the plenum and having a custom tune done?

If this is correct, may I ask what facility did the dynamometer tests and are the numbers SAE-corrected, standard-corrected or raw data?

I was thinking the same thing as typically you need headers and exhaust along with what he has to get close to 400rwhp. Maybe the heads are done as well?

[Hib Halverson]

jonszr1 is posting to a number of other threads today and I had not read them all when I posted above. In reading a few of them a few minutes ago, as I understand it, the car has headers and not cats. That makes a *huge* difference. Now that I know that, I can see 409 at the wheels.

I'll add that headers and no cats hardly makes the engine "stock"

The AutoMasters Street Skinner in my #140 makes 412 at the wheels from a 475-500hp engine which uses stock manifolds and cats. Where I to switch to headers, with appropriate recal., I'd easily make 425 and 430 at the wheels might be possible.

Also, there's a lot of discussion in recent years of replacing any resonator in the system with an "X-pipe". I've thought about doing that too.

I've thought about revising the article on the CAC about my exhaust system by adding a set of Dawson Racing Headers, cats off a new Z06 and an Z-pipe then going back to WesTech's dyno for more tests.

[jonszr1]

hib ' I didn't mean totally stk . as an old ahra drag racer headers was stk sorry. my car has ported inj housings jeal headers dyno tech hi-flowcats ccomplete flowmasters 21/2 in exhaust. and a custom prom . the best thing is no knock event at 5200. Corey henderson did the porting and the tune as well as installed 410 gears. his ph 210-867-6286. he would have the answers on nthe sae figure. i remember reading your modsto the flow master and really wanted to hit 420 rwhp a personal goal. i really just wanted to share what a fine job that young man did. i have been in hotrodding 35yrs and as we all know it can be hard to find a relly good shop that does what they say and giving a good monitary a plus. I wasn't bragging and sorry if any one felt that way, notmy intention at all. Corey is just getting ready to open up a real business instead of his back yard and thought to share my experience to give the zr1 guys another choice if they so desired. I wanted to pick your brain about that xpipe in a muf to see what your thoughts were. this old guy would like to be a little on the sleeper side .loud is for young folk Imho. if you have suggestion on how to improve my ex tract i would be very thankfull. Maybe i can get corey to post the dyno sheets . alli have is a lapp top. sorry

[Hib Halverson]

Originally Posted by jonszr1

(snip) i have been in hotrodding 35yrs and as we all know it can be hard to find a relly good shop that does what they say and giving a good monitary a plus.

Hard to find a really good shop?

You said a mouthfull there!!!

[jonszr1]

.I have tried for 2 years to find a good zr1 shop in so cal. thats why i took the chance on driving 1500 mi. to coreys" .I amvery glad I did.excellent work done Great priceing and total honesty. I know there are others out there.but for me i have found the guy to do the things i either don't have the time/knowledge to do.. I hopefully will be testing my new exhaust system right after the first of the year . will try to do a same daytest to give a good comparison.