View Full Version : How much power am I leaving on the table???

04-02-2012, 08:16 PM
2002 z06 car made 505/466. Its a TSP 427 ls3,callies crank,callies rods ,weisco pistons, PRC stg 3 ls6 heads,TSP ls7s 242/250 .650/.650, kooks 1 7/8, kooks off road x pipe,.......Car still has factory ls6 intake, throttle body and ti catback.....Car drives great and has PLENTY of power.(not sure if I even want to mess with it) Wondering how much power I am leaving out there (est.)? Also what catback are most people running? Thanks

04-03-2012, 09:19 AM
The catback probably is only costin you about 5hp. The intake/TB however probably around 15-20.

04-03-2012, 10:34 AM
The catback probably is only costin you about 5hp. The intake/TB however probably around 15-20.

Agree!! is it possible that the heads are a little weak too? Maybe get Trickflow 235's? I don't know a whole lot. Just asking.

04-03-2012, 01:45 PM
Thats great news on the catback....I really like the sound of it and also no drone so prob. gonna leave it.

04-03-2012, 03:35 PM
The factory titanium catback is the best bang for the buck. I tested it verses an open exhaust and only lost 3hp. Keep it. As mentioned above, the heads, camshaft, intake, and TB are probably the power restriction at this point. If you don't want to change heads and/or camshaft at this time, at least go with a ported GM LS7 intake or FAST and at least a 90mm TB. I used to run a camshaft that was very close to the specs that you listed. I replaced it with a custom grind from my engine builder and changed nothing else, and picked up 40 hp and 40tq across the rpm range. Also, make sure that your tune is good. To answer your question as to how much power you are leaving on the table; probably 90hp and 60tq judging from the 427 that I used to have. However, you will spend quite a bit of money to add this much power to your engine. I would just change the intake and TB and see if you want to go further.

04-03-2012, 04:23 PM
Between your intake and exhaust I would say 50+ whp

04-03-2012, 04:51 PM
Sounds like a very mild build indeed for the cubes.

Cam, heads, intake/TB.

However, comes down to the driveability factor. If you like what you have now, why risk driveability? Definitely intake/tb could gain some power and not sacrifice that. A lot of it is in the tune as well

04-03-2012, 05:04 PM
I gained 31 rwhp and think it was like 24 rwtq going from a stock ls6 and ported TB to a ported 102 and NW 102 TB on my 408

04-04-2012, 04:58 AM
A friend of mine (FastorangeZ) had a near identical setup on his '01ZO6 as you have now. Changed to cnc'd LS7 heads with a ported LS7 intake with 90mm TB. Made 540rwhp through the Ti and 572rwhp with the cutouts open. The Ti is a good system but after 500hp, it starts to choke. So to answer your question, you have a considerable amount of power left on the table.

04-04-2012, 09:52 PM
PRC stage 3 LS6 Heads at .600 intake 324cfm exhaust 230cfm

04-07-2012, 08:57 AM
Sounds like a stout combination! :D The dyno seems to be very accurate as well, some numbers from other builds are to good to be true.

A Fast 102/102 would probably surprise you with the gains....fussy to tune as well.

I've been digging in to cylinder heads the last few months, one thing I have learned, flow numbers & heads are not the complete story.

Here is a link that test some of the heads mention in your thread including the TEA LS6 heads. Check out the Pro Comp LS1 heads :eek2: & compare them flow numbers to the big guy's.