HP missing with g5x2 cam
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
You gotta get the exhaust perfectly restrictionless before you can go blaming the heads. A fully ported TB needs to be in place as well. The thing would probably make 445+ with the right exhaust and a well done TB.
Originally Posted by 66ImpalaLT1
Is there any 450rwhp C5's with TPIS headers? How about with Kooks? Rather than do it twice, just buy LG's proven C5 long tube headers.
Buckmasters 436ci ARE.
A couple of ATI guys here in K.C. I've never heard or seen a TPIS car over 450. But that could've been application and other mods as well.
my 01 ta made 424.1 & 408tq with r.g.r 5.7 st2 speed inc heads,mti 222/222 hammer cam,mac's w/off roads,b&b try-flo,mti lid,160 t-stat and 12bolt w/3.73's. hell...i still had stock pullies,t-body and mass air,i think you are dynoing low. maybe those heads just dont perform like (NE14A6T9) said.
Staging Lane
Joined: Oct 2003
Posts: 99
Likes: 0
Originally Posted by 66ImpalaLT1
Is there any 450rwhp C5's with TPIS headers? How about with Kooks? Rather than do it twice, just buy LG's proven C5 long tube headers.
That said, my LGM's should be on the doorstep today
I may have overlooked it, but which intake manifold? If it's an 01, presumably it's an LS6?
ne14abc123, this bud's for you.
-Jake
FormerVendor
Joined: Nov 2001
Posts: 654
Likes: 0
From: Dallas/Wylie Texas
The TPIS headers can make a good peak number, but our header are a full 32" long with a 3" X pipe and 3" rear pipes. We just made 426 rwhp 408rwtq with a stock
ls6 head and our LG Pro Long tube headers. It is the power under the curve that our headers give, not just peak hp numbers. And these are through the stock mufflers.
The G5X-2 cam has makes over 450 on a regular basis with a good set of heads. The cam is not in question. I would look at the Headers first, then the heads. There might just be a small problem with them.
The pieced together exhaust system that most C5 owners were forced to install because that is all that was available then, is not the way to go. A 346 can use the 3" pipes all the way back.
Rob, give me a call and I will try to help you out with your problem.
Thanks, and hang in there.
Lou Gigliotti LGMotorsports
ls6 head and our LG Pro Long tube headers. It is the power under the curve that our headers give, not just peak hp numbers. And these are through the stock mufflers.
The G5X-2 cam has makes over 450 on a regular basis with a good set of heads. The cam is not in question. I would look at the Headers first, then the heads. There might just be a small problem with them.
The pieced together exhaust system that most C5 owners were forced to install because that is all that was available then, is not the way to go. A 346 can use the 3" pipes all the way back.
Rob, give me a call and I will try to help you out with your problem.
Thanks, and hang in there.
Lou Gigliotti LGMotorsports
Had a guy on another site post some numbers with cats and without.. engine lost torque with the "open" exhaust over the exhaust with the cats. Back pressure is important and not enough will allow power to go right out the pipes!!
Cstraub
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As others have said get rid of the cats.
Many people in the C5 world believe the twin flow can cause turbulence. If you can't get one of the big $ intakes put the factory box on with the zip tie mod.
Many people in the C5 world believe the twin flow can cause turbulence. If you can't get one of the big $ intakes put the factory box on with the zip tie mod.
Launching!
Joined: Dec 2001
Posts: 231
Likes: 0
From: Collin County
Not to knock LG headers I am sure they are a fine product, but there are quite a few 10 sec H/C TPIS cars running around.
Get a good mid section in that exhaust. I ran my 10.73 with the Random Tech CAT x-pipe.
Get a good mid section in that exhaust. I ran my 10.73 with the Random Tech CAT x-pipe.
Thread Starter
On The Tree
Joined: Jan 2003
Posts: 126
Likes: 0
From: nj
thanks guys, I know its definately not the cam, that i know makes power. The question is where am i missing the right ingredient. I am going to try and make power with these heads cause i am planning on AFR's when they are out anyway. I am going to start small and see if i can work my way to figuring out the problem. 1st step i am going to do is drive a pipe into the exhaust to smooth out the cats if not take the cats off completely. Next i am going to put the vararam on it and see where i stand then. I dont plan to do the ported throttle body yet because i might go with the 90mm FAST intake and throttle body. (wanna let someone else try it first )
So:
1. cats
2. intake
3. then i may try a throttle body on the dyno to see if it works, but waiting on the FAST
4. hopefuly its solved by now and i can put the mezire H20 pump on.
I rather not change the headers or the heads, wanna try the small **** first. I'll keep everyone updated, thanks for the suggestions
)So:
1. cats
2. intake
3. then i may try a throttle body on the dyno to see if it works, but waiting on the FAST
4. hopefuly its solved by now and i can put the mezire H20 pump on.
I rather not change the headers or the heads, wanna try the small **** first. I'll keep everyone updated, thanks for the suggestions
TECH Junkie
Joined: Nov 2001
Posts: 3,604
Likes: 0
From: Los Angeles
Originally Posted by JoSeY
what does that have to do w/anything???
Werd...get real headers, a ypipe and a high flowing exhaust...or get a nice corsa for street and for dyno/track get a 3" cutout...I produced similar numbers w/my Macs, ory, and corsa...
I say ditch the twin flow....people have had issue with the MAF readings on those from what I've heard (I have no evidence other than hearsay), and ditch the cats. Also only compare against cars on the same dyno...since every place is different. Highest number i've seen locally was like 430rwhp, out of about 10 h/c cars. Could be all the cars are slow, could be the dyno.
I'd get a stock ported TB from a vendor like Bauer or Jantzer, you said that you did 426 and you want 445, well I think a ported TB could be worth 5-10rwhp on your setup.
I'd never mess with gutted cats so if folks think that's a problem that should be also done.
I think you'd be there.
I'd never mess with gutted cats so if folks think that's a problem that should be also done.
I think you'd be there.
I'd like to know what the "*** clowns" have to say about the high hp patriot cars? This car has many restrictions. If he takes care of a few minor things like straight pipes instead of "gutted" cats, a couple of cut-outs, a ported TB, and this so called restrictive intake, he should hit 450 easily.
Originally Posted by Beast96Z
I'd like to know what the "*** clowns" have to say about the high hp patriot cars? This car has many restrictions. If he takes care of a few minor things like straight pipes instead of "gutted" cats, a couple of cut-outs, a ported TB, and this so called restrictive intake, he should hit 450 easily.
Some people are like my ex-wife, they always have to be bitching about something and starting ****. When dude fixes his exhaust and gets a TB, he'll make the numbers he wants. There is only one thing worse than a combo that is done "half assed".. that's one done "quarter assed" 
TECH Apprentice
Joined: Jul 2003
Posts: 316
Likes: 0
From: bronx ny
Number one *** clown here. show me where the restriction is? If non gutted cats drop hp 10-15, how much does a gutted cat drop it? I would think a gutted cat flows much better than a non gutted cat, at least in my world it does. I bet this guys goes through the expense of changing to staight pipes and chages his air box, ported tb and headers and picks up 2 hp. All every one does is speculate that if it had this and didnt have that it would make 450+ hp, well it didnt and alot otheres dont make power either so draw your own conclusions. while your all speculating check out obssed's post and speculate what all 5 cars would have made if it had this and that
https://ls1tech.com/forums/dynamometer-results-comparisons/118174-obsssd-s-pp-stg-ii-ls6-g5x3-dyno-graph.html
https://ls1tech.com/forums/dynamometer-results-comparisons/118174-obsssd-s-pp-stg-ii-ls6-g5x3-dyno-graph.html
Originally Posted by ne14a6t9
Number one *** clown here. show me where the restriction is? If non gutted cats drop hp 10-15, how much does a gutted cat drop it? I would think a gutted cat flows much better than a non gutted cat, at least in my world it does. I bet this guys goes through the expense of changing to staight pipes and chages his air box and headers and picks up 2 hp. All every one does is speculate that if it had this and didnt have that it would make 450+ hp, well it didnt and alot otheres dont make power either so draw your own conclusions. while your all speculating check out obssed's post and speculate what all 5 cars would have made if it had this and that
https://ls1tech.com/forums/showthread.php?t=118174
https://ls1tech.com/forums/showthread.php?t=118174
In all seriousness, some peoples cars are just pieces of **** and the best heads in the world won't help them. If I wanted to dig thru every freaking post on this board like you do, I could find other vendors cars that aren't making good dyno numbers too. The corvette that made 380rwhp was thru a really big stall and when he went to the track he ran 97 mph in the 1/8 or so, well on his way to a low 11 second 1/4. I know he is going to run the 1/4 in the next few weeks and I wouldn't be surprised if he ran a 10.9x.
I know what you should do, why don't you in all your "assclowness" post a poll of if you are happy with your "cheap" heads or not and if you'd buy them again. I don't think you'd like the results.
lastly.. if you are my ex-wife, I think this violates that restraining order I have against you.
Originally Posted by ne14a6t9
I would think a gutted cat flows much better than a non gutted cat, at least in my world it does.