Vortech Combo Idea
Vortech Combo Idea What do you guys think of this combination? Add some 6.0L heads and some headers to a stock motor. Then run a mild blower cam designed around a 6200rpm redline or maybe even a stock cam with some higher ratio rockers.. And then use the vortech 9lb kit with the smaller 2.5" pulley.
Wouldnt this make an easy 550rwhp on 93 octane gas? The stock shortblock and valvetrain would last forever with the low redline. The lower compression should eliminate detonation. I think this would be a reliable setup that would work well in a daily driver.
Any thoughts?
Wouldnt this make an easy 550rwhp on 93 octane gas? The stock shortblock and valvetrain would last forever with the low redline. The lower compression should eliminate detonation. I think this would be a reliable setup that would work well in a daily driver.
Any thoughts?
TECH Enthusiast
Joined: Dec 2001
Posts: 553
Likes: 0
From: Columbia, MD
Originally Posted by dug
What do you guys think of this combination? Add some 6.0L heads and some headers to a stock motor. Then run a mild blower cam designed around a 6200rpm redline or maybe even a stock cam with some higher ratio rockers.. And then use the vortech 9lb kit with the smaller 2.5" pulley.
Wouldnt this make an easy 550rwhp on 93 octane gas? The stock shortblock and valvetrain would last forever with the low redline. The lower compression should eliminate detonation. I think this would be a reliable setup that would work well in a daily driver.
Any thoughts?
Wouldnt this make an easy 550rwhp on 93 octane gas? The stock shortblock and valvetrain would last forever with the low redline. The lower compression should eliminate detonation. I think this would be a reliable setup that would work well in a daily driver.
Any thoughts?
I'd say you'll be close. If your drivetrain is all stock, you might hit the magic 550HP. But if you put in a 12-bolt or 9-inch, steel driveshaft and some gears, you might be off 20-25HP.
You have to upgrade the valvetrain when switching cams anyway (or at least you should), so go ahead and spin up to 6500. That should lock in your target numbers solid. Just watch out for breaking stock parts (clutch, rear-end, tranny, bottom-end, etc).
Good luck.
Crunch
Thanks for the reply. I have another question. With smaller pulley on the Gtrim would revvin to 6500 not overspeed the blower too much? I was under the impression that with the smaller pulley the blower wouldnt be able to handle more than 6200 rpms.
Yeah, I forgot to add changin valvesprings to the setup. Does changin the cam really give much power? It sounds like that bigger cam just eat up the boost while makin the same hp. To get the power of the cam the pulley needs to be changed to make up for the loss of boost. The stock 2000 cam looks like a good blower cam. I think they spec out to 201 I 209 Ex with 118 lsa. The .500" lift isnt bad and can be easily improved with some 1.85 rockers.
Im lookin to build something that is very reliable that could be driven coast to coast without worries.
Thanks for the reply. I have another question. With smaller pulley on the Gtrim would revvin to 6500 not overspeed the blower too much? I was under the impression that with the smaller pulley the blower wouldnt be able to handle more than 6200 rpms.
Yeah, I forgot to add changin valvesprings to the setup. Does changin the cam really give much power? It sounds like that bigger cam just eat up the boost while makin the same hp. To get the power of the cam the pulley needs to be changed to make up for the loss of boost. The stock 2000 cam looks like a good blower cam. I think they spec out to 201 I 209 Ex with 118 lsa. The .500" lift isnt bad and can be easily improved with some 1.85 rockers.
Im lookin to build something that is very reliable that could be driven coast to coast without worries.
TECH Enthusiast
Joined: Aug 2003
Posts: 596
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From: Downers Grove,IL
I'm running something along those lines 
. Stock cam, mildly ported ls1 heads with 73cc chambers using 918 springs. Shortblock is setup with 2618 alloy forged pistons and wide ring gaps , racing bearings and rebalanced stock crank with Stock rods. Head studs and mls gaskets. Good exhaust and a good fuel system. Very basic combo. My G-trim system is a bit modified 
You'll gain very little with a cam unless you can put the boost back to the same level. And with a G-trim ,a 2.5" pulley totally maxes it out.
Don't think for an instant the stock short block can survive forever with a 2.5" pulley on a G-trim. Your talking 13+psi boost with that combo! I take mine to 6400rpm and see about 13psi on a 80' day, more on a cold dry day.
6500 rpm = 71,760 impeller rpm.
I'm not into the dyno game. But trust me a maxed G-trim can make some good power.
I'm looking for low to mid 10's from mine. Not a 9sec terror but fast enough for me. I finally ordered a 9",spool and 3.50 gears yesterday. But I was trapping 125mph and 100+ in the 1/8th with ridiculous 2.73 gears a little PI 2800 converter and a 3600+ race weight last year, while lifting the heads in the process.
In my best PSJ voice, "To put that in perspective folks, that would be an easy 130+ with a m6 and 3.42 gears".
A 2.5" pullied G-trim is pretty potent.
Steve
. Stock cam, mildly ported ls1 heads with 73cc chambers using 918 springs. Shortblock is setup with 2618 alloy forged pistons and wide ring gaps , racing bearings and rebalanced stock crank with Stock rods. Head studs and mls gaskets. Good exhaust and a good fuel system. Very basic combo. My G-trim system is a bit modified You'll gain very little with a cam unless you can put the boost back to the same level. And with a G-trim ,a 2.5" pulley totally maxes it out.
Don't think for an instant the stock short block can survive forever with a 2.5" pulley on a G-trim. Your talking 13+psi boost with that combo! I take mine to 6400rpm and see about 13psi on a 80' day, more on a cold dry day.
6500 rpm = 71,760 impeller rpm.
I'm not into the dyno game. But trust me a maxed G-trim can make some good power.
I'm looking for low to mid 10's from mine. Not a 9sec terror but fast enough for me. I finally ordered a 9",spool and 3.50 gears yesterday. But I was trapping 125mph and 100+ in the 1/8th with ridiculous 2.73 gears a little PI 2800 converter and a 3600+ race weight last year, while lifting the heads in the process.
In my best PSJ voice, "To put that in perspective folks, that would be an easy 130+ with a m6 and 3.42 gears".
A 2.5" pullied G-trim is pretty potent.
Steve
Here is my approach...
#1
6.0 heads
1.85 rockers
CC 918 springs
L19 head bolts
V9, 2.5 pulley
1.75 into 1.875 step headers
#2
6.0 heads, 1.57 and 2.02 valves and 3 angle valve job
220/230//114 blower cam
CC 918 springs
L19 head bolts
V9, 2.5 pulley
1.75 into 1.875 step headers
-gain 10 cfm just going to bigger valves
#1
6.0 heads
1.85 rockers
CC 918 springs
L19 head bolts
V9, 2.5 pulley
1.75 into 1.875 step headers
#2
6.0 heads, 1.57 and 2.02 valves and 3 angle valve job
220/230//114 blower cam
CC 918 springs
L19 head bolts
V9, 2.5 pulley
1.75 into 1.875 step headers
-gain 10 cfm just going to bigger valves
TECH Enthusiast
Joined: Dec 2001
Posts: 553
Likes: 0
From: Columbia, MD
Originally Posted by dug
Crunch
Thanks for the reply. I have another question. With smaller pulley on the Gtrim would revvin to 6500 not overspeed the blower too much? I was under the impression that with the smaller pulley the blower wouldnt be able to handle more than 6200 rpms.
Thanks for the reply. I have another question. With smaller pulley on the Gtrim would revvin to 6500 not overspeed the blower too much? I was under the impression that with the smaller pulley the blower wouldnt be able to handle more than 6200 rpms.
So you guys dont think the stock short block can handle 12lbs of boost even with lower compression for the truck heads? Maybe it would be cheaper to just rebuild the motor with some low compression pistons and use the stock heads. It would be a lot more work though.
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Originally Posted by dug
So you guys dont think the stock short block can handle 12lbs of boost even with lower compression for the truck heads? Maybe it would be cheaper to just rebuild the motor with some low compression pistons and use the stock heads. It would be a lot more work though.
Kyle
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Verdad Gallardo Yeah, Id probably get a set of rods too while I was in there. They not that expensive. Its probably better to rebuild the motor while its still healthy instead of waiting for it to break. Otherwise when it breaks other things get messed up.
Yeah I like the cam for FI. Its supposed to be a good for n/a too.
Yeah I like the cam for FI. Its supposed to be a good for n/a too.
550 is too high for the stock bottom ends, specifically the rod bolts and pistons.
if you want the power spend the money build it right then get boost happy.
you don't need high ratio rockers unless you are running a smaller cam and want the benefit of getting higher lift without swapping cams.
lowering compression does not guarantee elimination of detonation, tuning is the key, someone who knows how to tune for FI.
you can get 550 without a cam by the way. the vortech is a great system i know cause i have it and love it.
if you want the power spend the money build it right then get boost happy.
you don't need high ratio rockers unless you are running a smaller cam and want the benefit of getting higher lift without swapping cams.
lowering compression does not guarantee elimination of detonation, tuning is the key, someone who knows how to tune for FI.
you can get 550 without a cam by the way. the vortech is a great system i know cause i have it and love it.
If youre gonna have to pull the motor anyways its tempting to go nuts. Absolute speed got some good flow out of their 6L heads. Even at lower lifts. Imagine using those heads with with a T-trim. 650rwhp should be easy, if it can be tuned.
So whats the deal with the maf? It gets maxed out at a certain point and cant read the irflow?
It would be fun to have a 9 second street car.
So whats the deal with the maf? It gets maxed out at a certain point and cant read the irflow?
It would be fun to have a 9 second street car.
