Will my combo benefit from a fast 92mm setup?
Thread Starter
Joined: Jan 2005
Posts: 15,713
Likes: 7
From: Humble Texas
Will my combo benefit from a fast 92mm setup? theres so much conflicting info in the search. I see some posts where they gain 10hp/tq at the loss of a lot of under curve power, and I see some where it gains 20hp/tq from 3Krpm all the way up to redline. I CANNOT afford to lose anything above 3krpm due to my heavy weight, and understand that every combo is different.Im debating stepping up to a larger cam or getting the fast 92mm setup.
Heres what I have.
Stock bottom end LS1
Patriot stage II 243 heads unmilled
Cometic .040 gaskets
226/226 .587/.587 112+4 XER cam
Pacesetters with ORY
Cutout
LS6 intake manifold (truck intake actually put down better track times)
Underdrive pulley
This combo has put down 410hp on a dynojet with 4.10 gears A4 locked. This is also in an extended cab truck if it makes any difference. The best pass to date is 12.19@110 and im looking for the best way to make 11’s N/A. so what do I need? Fast 92mm or larger cam?
Heres what I have.
Stock bottom end LS1
Patriot stage II 243 heads unmilled
Cometic .040 gaskets
226/226 .587/.587 112+4 XER cam
Pacesetters with ORY
Cutout
LS6 intake manifold (truck intake actually put down better track times)
Underdrive pulley
This combo has put down 410hp on a dynojet with 4.10 gears A4 locked. This is also in an extended cab truck if it makes any difference. The best pass to date is 12.19@110 and im looking for the best way to make 11’s N/A. so what do I need? Fast 92mm or larger cam?
Thread Starter
Joined: Jan 2005
Posts: 15,713
Likes: 7
From: Humble Texas
Im not sure exactly what size it is but its pushing my extended cab silverado for some 1.69-1.72 60' times. i can only brake stall 2400 rpm though.i cant tell what it flashes to.
Yes you will benifit. Ive seen one dyno curve that showed low end losses and 100s that show gains everywhere and somehow everyone thinks it loses power down low????
I personally picked up everywhere.
I personally picked up everywhere.
Damian recommended it back in your dyno thread. He is the man, knows his stuff:
https://ls1tech.com/forums/dynamomet...l#post10362477
The reason he recommended it is because you have good flowing CNC'd heads & a cam.
SweetS10v8 thinks a fast is a good addition to any lsx engine regardless of heads or mods. Most dyno posts with fast intakes are on cars with mods and so most of the numbers are good. Once in a while you see a fast on an engine without mods and the dyno numbers aren't so good. No surprise.
https://ls1tech.com/forums/dynamomet...l#post10362477
The truck intake flows as/if not a tad better than the LS6 intake (Don't quote me on that though. Been a long time since I've seen truck flow #'s).
A Ported Fast setup would compliment your setup and bring up your rwhp #'s about +20-25. Area through the curve should improve as well, which is what gets the truck moving.
A Ported Fast setup would compliment your setup and bring up your rwhp #'s about +20-25. Area through the curve should improve as well, which is what gets the truck moving.
SweetS10v8 thinks a fast is a good addition to any lsx engine regardless of heads or mods. Most dyno posts with fast intakes are on cars with mods and so most of the numbers are good. Once in a while you see a fast on an engine without mods and the dyno numbers aren't so good. No surprise.
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no track times here and now ive done to many mods to know what done what next time at the track!!! I can honestly tell you that the intake i have is just ported in the runner where the thing was sticking out like a triangle, and i felt a very nice difference from the LS6 intake and i have a very crude tune. Come on i have a Mail order tune and i felt a difference with just removing the ls6 and installing the fast on the same tune
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I say go for it Stew, but I also think for your goal of a beast NA truck you should go for a larger cam as well, one to compliment your exact combo.
I though your converter was a 3600?
I though your converter was a 3600?
Its just information that I have gathered in my personal research, and found on my engine. Nothing more. Im not here to argue with anyone, just passing on what I know to be true.
Not many people put a fast intake on an otherwise unmodified lsx engine. I think yours is the only one I've seen on here. At a minimum people usually put on all the bolt on mods before the fast. Have you seen a lot of others post dyno numbers for a case like yours?
Ive seen so many curves in the time I put into research that I can say for sure. I wanted to spend my money wisely to say the least. And I feel it was well spent after I bolted it on.
So with these facts, we know that the FAST on a stock engine makes great power 100% of the time, and on a modified engine it loses on one out of hundreds, right???? lol.....
Just a note: Ive already removed my FAST intake, and it shall never run on my engine again. Im jumping into a set of CNC L92 heads, cam, 1 3/4" LT headers, UD pulley, and new exhaust system. The FAST 102mm for L92s should hopefully be releasing soon. Ill just run my 90mm DBW TB on it.
So with these facts, we know that the FAST on a stock engine makes great power 100% of the time, and on a modified engine it loses on one out of hundreds, right???? lol.....
Just a note: Ive already removed my FAST intake, and it shall never run on my engine again. Im jumping into a set of CNC L92 heads, cam, 1 3/4" LT headers, UD pulley, and new exhaust system. The FAST 102mm for L92s should hopefully be releasing soon. Ill just run my 90mm DBW TB on it.
Thread Starter
Joined: Jan 2005
Posts: 15,713
Likes: 7
From: Humble Texas
yeah so i upgraded from the 226/226 .584/.584 112+4 cam to a 231/239 .617/.5624 111+2 cam. picked up 20 peak but as much as 40HP in other areas of the curve. im keeping an eye out for a used 90 or 92mm intake manifold. i just cant bring myself to buy new.
Last edited by TXsilverado; Mar 30, 2009 at 08:58 PM.
Thread Starter
Joined: Jan 2005
Posts: 15,713
Likes: 7
From: Humble Texas
no track times here and now ive done to many mods to know what done what next time at the track!!! I can honestly tell you that the intake i have is just ported in the runner where the thing was sticking out like a triangle, and i felt a very nice difference from the LS6 intake and i have a very crude tune. Come on i have a Mail order tune and i felt a difference with just removing the ls6 and installing the fast on the same tune
its got more in it, especially with a dyno tune. Im going to swap to a cam like the one you just installed and some ARP rod bolts and shift her at about 7200-7300 with the 4.56 gears and 29.9 tire.... SHOULD be interesting!!!
fixed for you
Thread Starter
Joined: Jan 2005
Posts: 15,713
Likes: 7
From: Humble Texas
and i fixed myself again. i had the lift numbers all screwed up. im not sure about needing to spin this cam up to 73oo. mine levels out and falls over just at 6500rpm. 7k 1/2 shift and 6800 2/3 is what feels good with my setup.