STS cam confusion...
08-11-2007, 08:53 PM
#1
STS cam confusion... The setup I am going to run in a 6-speed 05 GTO is:
Stock cubes, stock shortblock
Fast 90 intake manifold
317 heads with 921 springs
stock manifolds
catless midpipes
STS w/ GT-70 and FMIC
60lb injectors
340 Walbro fuel pump
Crappy 91 octane in Phoenix
I have been making my eyes hurt trying to figure out a cam choice. Right now I am set up for NA so I have to get a new cam and get rid of my Kooks headers.
Why is it that some people recommend a larger exhaust duration and some recommend a larger intake duration? I am getting the kit used and the guy I am buying it from is recommending I run a Lingenfelter GT2-3.
Thanks,
Confused as Hell.
Stock cubes, stock shortblock
Fast 90 intake manifold
317 heads with 921 springs
stock manifolds
catless midpipes
STS w/ GT-70 and FMIC
60lb injectors
340 Walbro fuel pump
Crappy 91 octane in Phoenix
I have been making my eyes hurt trying to figure out a cam choice. Right now I am set up for NA so I have to get a new cam and get rid of my Kooks headers.
Why is it that some people recommend a larger exhaust duration and some recommend a larger intake duration? I am getting the kit used and the guy I am buying it from is recommending I run a Lingenfelter GT2-3.
Thanks,
Confused as Hell.
08-11-2007, 10:15 PM
#2
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in my opinion the exhaust duration is the most important...the turbo runs off the exhaust so the longer you have it comin out the better it will be. the intake duration really shouldnt matter because youve got pressure forcing the air in.
08-12-2007, 01:07 AM
#4
Originally Posted by trtturbo
The gt2-3 will work fine for the turbo. JMO, but I would ditch the 921's, get the Patriots and save a few $$'s too.
Is there a better cam for my application or should I just stick with the GT2-3. I haven't bought a new cam yet, so your input is welcome.
08-12-2007, 01:25 AM
#5
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I'm in the middle of my build right now and using a 228/228 588/588 114 cam. The GT2-3 has proven to work great on turbo cars can't go wrong with it, but if you are wanting more just use a straight pattern or reverse split with a lsa of 114 or higher
08-12-2007, 01:50 AM
#6
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patrick guerra up here can help you along with several others if u need it. there is also others that have VERY good knowledge of cams just look around and see, people will notice this and come looking to help you if not, then a few pms will get them to help u
08-12-2007, 03:41 AM
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Originally Posted by deadmanTA
I'm in the middle of my build right now and using a 228/228 588/588 114 cam. The GT2-3 has proven to work great on turbo cars can't go wrong with it, but if you are wanting more just use a straight pattern or reverse split with a lsa of 114 or higher
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08-12-2007, 09:54 AM
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Originally Posted by 99Z28LS1
sounds like a great cam, mine is almost the same, 115 LSA for me though
We have done reverse splits (226/220), & straight (228/228). With the 228 cam, we usually make 475 - 500 at 5psi. Last one made 477/501 @5psi in a 9.0:1 347 through a 6 speed.
We have a cam coming for a 408 that is 236/230 .601 .595 117. Curious to see how it does.
08-12-2007, 02:09 PM
#9
Originally Posted by trtturbo
We did Allens cam (99Z28LS1) and several others just like his. We have had the chance to try several grinds and set ups.
We have done reverse splits (226/220), & straight (228/228). With the 228 cam, we usually make 475 - 500 at 5psi. Last one made 477/501 @5psi in a 9.0:1 347 through a 6 speed.
We have a cam coming for a 408 that is 236/230 .601 .595 117. Curious to see how it does.
We have done reverse splits (226/220), & straight (228/228). With the 228 cam, we usually make 475 - 500 at 5psi. Last one made 477/501 @5psi in a 9.0:1 347 through a 6 speed.
We have a cam coming for a 408 that is 236/230 .601 .595 117. Curious to see how it does.
08-12-2007, 04:38 PM
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Post #2
Originally Posted by twitch32
Originally Posted by trtturbo
That's nice to know. My goal is 550-600 @ 8 psi (All budget build)
Originally Posted by twitch32
in my opinion the exhaust duration is the most important...the turbo runs off the exhaust so the longer you have it comin out the better it will be. the intake duration really shouldnt matter because youve got pressure forcing the air in.
Originally Posted by trtturbo
With the 228 cam, we usually make 475 - 500 at 5psi. Last one made 477/501 @5psi in a 9.0:1 347 through a 6 speed.
08-12-2007, 06:57 PM
#11
People have recommended the GT2-3 for my future STS powered goat. Poking around on the Lingenfelter website I came accross the GT2-2 with is only $250 vs $386 for the GT2-3
The GT2-2 specs out at 207/220 .573/.580 117.5 CL
The GT2-3 specs out at 207/220 .571/.578 118.5 CL
What difference does the CL make? Duration and lift are nearly identical. It doesn't mention what lobes the cams are ground on. Maybe that's different?
I've also seen people recommend the GT7 cam
The GT7 specs out at 208/230 .554/.546 121CL
The GT2-2 specs out at 207/220 .573/.580 117.5 CL
The GT2-3 specs out at 207/220 .571/.578 118.5 CL
What difference does the CL make? Duration and lift are nearly identical. It doesn't mention what lobes the cams are ground on. Maybe that's different?
I've also seen people recommend the GT7 cam
The GT7 specs out at 208/230 .554/.546 121CL
08-12-2007, 08:33 PM
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One degree difference in LSA will not be noticeable. Indeed, it's within the normal variation tolerance for afermarket cams. I think the 2-2 just happens to be on sale right now. Maybe they're trying to clear them out in favor of the 2-3.
08-12-2007, 11:44 PM
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I have the same 228/228 as mentioned above as well. Little bit of lope and no problem daily driving. Also, not that its completely relevant but I did 27.5mpg coming back from Texas and 26mpg with A/C returning from Savannah.
Ill report back how it does on my 9.5:1 346 with M6 next week once tuning is done. Should be in the 475+ range with the 317s and meth.
Currently running .4bar spring and 60-1 turbo and it hits full boost pretty fast and holds it good. I'm also running a MBC, still set at 5psi but will possibly crank to 7psi for the final tune. In the limited data logging runs that I've done, it pulls strong. Stock manifolds wrapped with .96 housing. Im interested to see what a .81 housing will do with my T67.
Ill report back how it does on my 9.5:1 346 with M6 next week once tuning is done. Should be in the 475+ range with the 317s and meth.
Currently running .4bar spring and 60-1 turbo and it hits full boost pretty fast and holds it good. I'm also running a MBC, still set at 5psi but will possibly crank to 7psi for the final tune. In the limited data logging runs that I've done, it pulls strong. Stock manifolds wrapped with .96 housing. Im interested to see what a .81 housing will do with my T67.
Last edited by JAvenger007; 08-12-2007 at 11:57 PM.