Ported plenum and I.H. increases-worth it? - Page 2 - ZR-1 Net Registry Forums

Locobob · 12-18-2005

It is a lot of work but with LT5's cheap and easy mods just dont exist. The results of porting are quite gratifying, as you can see by the dyno graph there is a solid increase in power across the entire useable rpm range when running the car hard.

1990 quasar blue · 12-18-2005

Quote:

Originally Posted by cuisinartvette

That's a lot of work for 20-30 hp,. maybe I should wait til the heads can be done. Thanks for the input!

Not so much. The addition of porting, Flowmaster, and HAT chip gave me another 35 rwhp and 22rwt at peak. However, peak isn't everything. At 6900 rpm the car gained an additional 50 rwhp and 38rwt. Total cost was about 2000.00. R&R was tit. The cost and time was well worth it. We'll see what headers do this winter.

Robert, thanks for the opinion on the throttle body. I read some archived threads on the other place from back when Jeff was thinking about it. You're right, if it's not worth anything like the majority believe, then why do all the big names do it.

FU · 12-18-2005

Quote:

Originally Posted by cuisinartvette

That's a lot of work for 20-30 hp,. maybe I should wait til the heads can be done. Thanks for the input!

You will be much happier doing the heads with the package. If you don't it will be done at a later date.

cuisinartvette · 12-19-2005

Quote:

Originally Posted by FU2

You will be much happier doing the heads with the package. If you don't it will be done at a later date.

Maybe its time I tear your beast apart, then!

I was thinking of doing the plenum and IH that are on the car nowas I can't imagine it ouwld be down for more than a few days, but I guess it makes sense to tear into this other motor, do it up, and swap them out in a weekend. Even though I've been told my botom end is solid and should last a long time, I just can't bring myself to tear the top end off and have ANOTHER car that's not running.
Thanks, guys!

cuisinartvette · 12-19-2005

Oh yeah, whats the hot setup with the T.B. mods?
Stock displacement

Kevin · 12-20-2005

Didn't kurt dyno his 415 with a stock and 63mm TB and find like 3 hp with the bigger one?

12-18-2005	#11
Locobob Join Date: Jan 2004 Location: Portland, OR Posts: 1,057	Re: Ported plenum and I.H. increases-worth it? It is a lot of work but with LT5's cheap and easy mods just dont exist. The results of porting are quite gratifying, as you can see by the dyno graph there is a solid increase in power across the entire useable rpm range when running the car hard. __________________ Robert ZR-1 Net Registry Oregon State Director 91 ZR-1 #431 Black/Black LPE 368

12-19-2005	#15
cuisinartvette Join Date: Aug 2005 Location: San Fernando Valley, CA. Posts: 896	Re: Ported plenum and I.H. increases-worth it? Oh yeah, whats the hot setup with the T.B. mods? Stock displacement

12-20-2005	#16
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,632	Re: Ported plenum and I.H. increases-worth it? Didn't kurt dyno his 415 with a stock and 63mm TB and find like 3 hp with the bigger one? __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" Last edited by Kevin; 12-20-2005 at 09:06 PM.