I got off the phone earlier with John Page at 21st Century Musclecars (LPE South) and told me that my combo made 360 RWHP. The baseline stock dyno run was 296. My setup is:

Stage 1 LPE LS1 heads, GT2-3 cam, LS6 intake mainfold, SLP lid and stock exhaust manifolds and converter.

I think thats pretty good for an auto, any other thoughts? I don't have the graphs to post since the car is still down at thier shop in Texas. I know I put the cart before the horse doing the H/C package before the headers and converter but they will come eventually. It should be a fun car to drive when I get it back in a few days.

 

Sounds like decent numbers but I'd like to see what it puts down with full exhaust.

 

reliable #'s for stock manifolds and converter

 

You should have great driveability/sleeper setup with that cam but you're leaving allot on the table without a good set of headers

 

You should pick up another 40-50rwhp with a good set of LT's and catback. I know my car did.

 

Yes, those stock manifolds are killing a lot of power.

 

No way I'd say it would be consistant forever, like a beagle; at some point you think greater than if I've could gonna wanto go mids or should lts.

 

you need long tubes bad. youre leaveing alot of power behind.

 

Sorry for not replying guys, I went to pick up the car in the last few days. First off the improved power was very very noticeable, Idled like stock, you wouldn't know anything was done to it. Popping the hood is also impossible to tell anything was done to it- other than a missing EGR, few would be the wiser. The dyno graph torque curve is pretty flat from about 3400 at 340+/- ft LBS, I'll post the graph in the next day or 2. I drove it 600+ miles back home today with NO problems and it ran great on the highway, I have the speeding ticket to prove it . They agreed at 21st C.M.C. (as i already knew) that good headers would really wake it up even more. Long tubes are definetly in the future, I'll be saving up for some Kooks and and better stall. For now it's an excellent combination between a reliable D.D and a good fun steet car. 21st Century Muscle Cars (LPE south) did an excellent job and thanks to Ed Potter at the main shop for helping me out with the parts combo and other misc selections.

 

so your talking about a 64 RWHP gain,thru the STOCK manifolds?hell yeah,i would say that is an excellent gain.if i remember right,the GT2-3 has a fairly large standard split dur.,so it works well with a stock exhaust system.put some LTs on there and you should easily see 380+HP.

 

You guys are overly optimistic on how much gain you'll get from headers. I was making 411 rwhp with stock manifolds, cats and SLP dual dual catback with my original CheaTR package (AFR 205s, Thunder CheaTR cam, FAST 90/90). When we swapped to the 1 3/4" Kooks headers, we only gained 22 rwhp. See the attached graph:

 

but the cheatr cam is pretty mild, I dunno the specs on his but I would think he'd see about 30rwhp or maybe more. And wasn't the cheatr made to run strong on a stock manifolds car for the sleeper effect?

Don't get me wrong I think 50rwhp is ver optimistic, but I would say he could easily pick up 30 with LTs and true duals... or a nice Y (if you're into that sorta thing)

 

i agree that you won't see a 40HP+ increase with LTs,but around 20 should be realistic.like i said earlier,the GT2-3 works well with a stock exhaust system because of the extra exhaust dur.,similar to your CheaTR cam.so naturally the gains won't be as much if he was running a single pattern cam.but 360hp with a stock idle and exhaust is a stealthy combo.i would be tempted to just leave it as is.

 

do you have flow numbers for those heads?valve sizes?were the heads milled and what CR are you running?so for all the questions,lol.

 

You are mistaken about the CheaTR cam being mild. While it may be mild compared to a T-Rex, it's more aggressive than the LPE GT2-3 cam that is being discussed in this thread. Check it out:

LPE GT2-3: 207/220 .571/.578 118.5LSA
Thunder Racing CheaTR: 215/230 .600/.578 117LSA

The CheaTR is a more aggressive cam than the LPE cam. 411 rwhp through stock exhaust manifolds and cats with the CheaTR has a lot more exhaust flowing than 360 rwhp with the LPE GT2-3. So my point is, that even with 50 more rwhp than featured in this thread, headers only gained me 22 rwhp over stock manifolds and cats. Cutout open too. Both were tuned, both were on the same dyno, 1 day apart. FWIW, the cutout only gained me 2 rwhp over running through the closed SLP dual dual catback...a testimony to how insensitive the CheaTR Cam is to back-pressure.

 

They said i would probably get another 20-30 rwhp with headers with a good retune. I forgot to mention that I had the SLP dual/dual exhaust already optioned with my car from the start so a catback is covered.
I think of the GT2-3 cam as a 2002+ ZO6 cam on steroids. I was looking more towards DD reliability than all out power hence the smaller 'baby' cam. With the 918 springs I should be good for a long valve train life span too. I think once I get some good headers and a conservative 3000+/- stall I should reach my goal of a reliable and fun DD and be done with with the car. (famous last words right??)


Sorry i don't have the flow #'s for these heads. The heads were 'cleaned up' a little and had a 63 cc IIRC so they're close to the stock CC's. I think the compresion was like 10.4:1. The valves are stock sizes also.

FWIW Here's a couple of pictures of my car at LPE South just after they rolled it out of their shop on Friday the 7th, it was out of place with all the Corvettes inside and outside of the shop for sure. Ignore the date on the pics, I never got around to changing the setting on the camera:

 

here are the dyno graphs as promised:

Here is the after results:



Heres both before and after:

 

Im not being optimistic... Im just being realistic. I wasnt speaking out of my ___ when i said he is going to gain at least 40rwhp with headers, LID and catback.

I gained 33rwhp 24rwtq with a LID and Loud Mouth Catback( I didnt have an exact graph that compare stock VS. LID and LM, but i posted a graph that cover all my runs in the sig. You can see my stock runs(Purple color) VS the LID and LM (Green Color).

Then i gained another 23rwhp 27rwtq with the FLP Long Tube headers(Graph posted).

All mods were proven on the same dynojet.

I only change running on the same dyno when i increased the boost to 11psi because the dynoshop i used to deal with moved from the area.

 

He already has a good catback. No way he was going to add another 40-50 as you pointed out in post #5. You gained 23 rwhp with the addition of headers. I gained 22. Thank you for reinforcing my point.

 

Here's what mine did with everything in my sig except the throttle body. I'm still running the stcok catback. Cam vs cam/heads