C U IN REARVEIW

what hp gains are realistic if i just did an intake and hi-flow heads set up?


-what is done so far....
callaway cai
ported ls2 tb
ported ls2 intake manifold
160 stat
kooks lt headers
no cats
full bassanni exhaust
ECS mail order tune
this is a 6sp z51......


i was thinking of either porting stock or buying a good set of heads and a fast 102 intake,but wondering how much hp/tq i would gain for the $.....still on the fence about installing a cam??


so what kind of realistic gains could i see??

C U IN REARVEIW

Anyone?

Jack Package

20-40 hp, my guess would be 25 for the heads and 10 for the intake (with tuning). Check out this test from a while back, they made 37hp with heads and tuning only but that was with LS1 heads (not LS2/LS6) and previously stock tune.

http://www.gmhightechperformance.com...all/index.html

I wouldn't bother with the FAST unless you are adding more cubes. Ported stock intake is fine for heads or heads/cam n/a motors. If it was my car I'd order a good cam, valvesprings, pushrods and timing set then have someone tune it. You'll get more power, more cheaply and it will sound cooler. I've been dying to put that 219/223 cam from Lunati that GMHTP tested in my LS2. 90hp and perfectly tame.

http://www.gmhightechperformance.com...t_results.html

C U IN REARVEIW

GREAT LINK THANKS,VERY IMPRESSIVE. I have never heard of Lunati before,have they been around long? maybe i missed it in the article...but what cfm # heads were they testing?

FloydSummerOf68

...What?!?!?

We're talking about an LS2, not an LS3.

The differences between a Ported FAST and a Ported Stock LS2 are huge.

camarochevy19702

I believe almost 30 HP in fact

C U IN REARVEIW

Floyd,what is your take on my original question?

FloydSummerOf68

Maybe over stock, but not a stock ported intake. The Ported FAST is usually good for about 25rwhp peak and 30+ under the curve over a bone stock LS2 intake.

I have no idea what ported heads would get you with a stock cam. I've never heard of anyone doing that. I wouldn't expect too much though.

PRE-Z06

Even a small sleeper cam like the one in my car would gain more power than both the ported heads and intake, so it'd be a better bang for the buck. Though the LS2 intake is garbage and the FAST will show a nice gain. Ported heads won't see as much of a gain with the factory cam and you can't mill them much either as the LS2 already sits at 10.9:1 static compression and would cause the DCR to be too high.

camarochevy19702

I was thinking with an aftermarket cam, my bad.

C U IN REARVEIW

i want to have the car very street friendly,even at idle i dont want it to be really lopey...thats my hesitation with a cam

FloydSummerOf68

You just want a cam with negative overlap then.

Moderate duration and medium-high lsa will do that.

Thunder Racing makes a decent cheater cam (the V3) which is a 219/230 117lsa at around .600 lift

PRE-Z06

That is almost identical to my sleeper cam(218/230 .605/.604 116) that I speced in late '08, I can lug the motor down at 30mph in 6th at 900rpm and cruise without bucking...check out some videos on my youtube to get an idea of how docile it is "vegaman72"

Jack Package

On a boosted motor with a cam and ported heads 30-50rwhp. With ported heads, stock cam and no boost there's no way you are making 30hp with a FAST intake swap. LS2 intake does suck, no denying that...but if you find a back to back dyno with a stock LS2 and the FAST intake swapped on let me know.

Lunati has been around for a while, their rotating assemblies are very nice as well and they make springs to go with the cam.

camarochevy19702

as I stated above Jack, my example where we gained 30 was on a car with a cam, not stock, that was my mistake

Jack Package

Sorry missed that dude...not to get off-topic, but was it just a peak gain or was there no torque or under the curve power loss?

camarochevy19702

would have to check, don't really remember seeing lose, but yes the big gain was all peak in this instance, and this guy was using it for 1/4 mile only

FloydSummerOf68

A Ported FAST 102 can make high 20s on a stock motor LS2...happens all the time. And it will make over 30rwhp/rwtq under the curve.

0Anthony @ LGMotorsports

Floyd is correct. A FAST on the LS2 cars is a BIG deal and something a lot of guys completely overlook.

I can tell you this from my own 2006 Z51 M6 car.
Baseline 357 rwhp 345 rwtq
Added LG Pro 1 3/4 headers and cold air 383hp/383tq
Borla Z06 cat back 390hp/396tq
FAST 90 (un-ported) 401hp/409tq....but what it doesn't show is that the car picked up 2200-5000 RPM almost 27 ft-lbs THROUGHOUT the entire RPM curve at that point. Sure peak numbers are up, and not a ton but the low and mid range power was a HUGE increase. At some points almost as much of a torque gain as the headers.

At some point I did a run down with dyno sheets on here as to how the car picked up the power.

After I sold the car the next owner added in our G5X1 cam and the car put down 457 rwhp and 445 rwtq...on a cam that generally only picks up 30-35 hp, so you can see how the ground work really opened up the door way.

Doing heads at this point, I don't think would be a huge gain, at least not a ported stock casting but I have done AFR 205 heads on a stock LS2 with headers and seen a 30/30 rear wheel gain.

C U IN REARVEIW

great info,thanks! just so i understand...the ported fast 102 would still p/u how many hp/tq under the curve over my ported ls2 intake? if i could find a cam that didnt make my vette sound like a tractor and still put down good power...i'd be all over it....
then i cant help but wonder with all that money spent...should i just boost it???? but really dont want to pop the motor