Shorter Runners for FAST Intake!!!
According to FAST's website no. According to the rest of the world, yes. This was the same frustration with the LSXR with the short(er) runners. I ordered it from a reseller before it was ever mentioned on the FAST website. In fairness, this is behavior that from a reseller perspective might be applause-worthy; they are allowing their resellers to get the product out there before the mfg website starts "competing."
Supposedly the cathedral LSXRT out-performed the LSXR on same engine so I'm very interested to see how it runs with L92 ports!
http://gmauthority.com/blog/2016/12/...s3-v8-engines/
Supposedly the cathedral LSXRT out-performed the LSXR on same engine so I'm very interested to see how it runs with L92 ports!
http://gmauthority.com/blog/2016/12/...s3-v8-engines/
TECH Junkie
Joined: Dec 2005
Posts: 3,092
Likes: 11
Interesting. I would like to see some back to back dyno tests and see where peak power is made. Right now my peak power is at 6600rpm and holds on fairly well. I am not sure if this would fit on my car hood clearance wise. By the way I am running a LS3 based 427 motor in my 1965 Buick Skylark.
Interesting. I would like to see some back to back dyno tests and see where peak power is made. Right now my peak power is at 6600rpm and holds on fairly well. I am not sure if this would fit on my car hood clearance wise. By the way I am running a LS3 based 427 motor in my 1965 Buick Skylark.
Couple more pics:
In the last pic, you can see there is a little gap where the runner mates to the lower shell. This was only on the runner for the #1 cylinder. I think I can take it apart, fit it a little better, and reassemble to fix it.
In the last pic, you can see there is a little gap where the runner mates to the lower shell. This was only on the runner for the #1 cylinder. I think I can take it apart, fit it a little better, and reassemble to fix it.
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Verdad Gallardo TECH Junkie
Joined: Dec 2005
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KCS, what is the overall height of that intake manifold at #1 runner? I have room for maybe 10" at that location. The stock manifold appears to be around 7" at #1 runner. Looks liked some of that lettering could be ground down to gain a fraction of an inch if need be.
That's measured from the top machined surface of the block where the valley cover sits.
Teching In
Joined: Feb 2005
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TECH Junkie
Joined: Dec 2005
Posts: 3,092
Likes: 11
With a 90mm TB, I'm betting it's totally be a wasted effort.
KW
10 Second Club
Joined: May 2009
Posts: 3,427
Likes: 227
From: over dere
And you have a butt-ugly avatar.
BTW.....I suppose you would believe that a gain of 12 HP at 300 RPMs higher, and a LOSS of 15 TQ is a significant gain. I would disagree.
Also, horsepower and torque below the curve suffers with the HP runners versus the full length runners.
Jus' sayin'........
KW
BTW.....I suppose you would believe that a gain of 12 HP at 300 RPMs higher, and a LOSS of 15 TQ is a significant gain. I would disagree.
Also, horsepower and torque below the curve suffers with the HP runners versus the full length runners.
Jus' sayin'........
haven't seen this posted yet. https://www.youtube.com/watch?v=3Q1uLxKAum8
Thread Starter
TECH Fanatic
Joined: Aug 2009
Posts: 1,845
Likes: 255
From: Coast of San Mateo County Between Pacifica & HMB
KCS.
What is the displacement, heads and cam specs on
you're engine below that LSXRT?
1989GTA,
I posted results with the mid length runners in both this
section (0 replies lol) and the Dyno results section with
few replies/comments.
I can surmise from my results that to take advantage
of the mid length runners a combination should
reach peak HP @ 7000 RPM Minimum up to 7500,
and shifting @ 7500 RPM Minimum up to 8000+
So I would consider LLSR & Top Tier Heads at a
minimum. Have some thoughts on a killer 416"
street/strip combo I will post in the other threads
if there is any interest.
What is the displacement, heads and cam specs on
you're engine below that LSXRT?
1989GTA,
I posted results with the mid length runners in both this
section (0 replies lol) and the Dyno results section with
few replies/comments.
I can surmise from my results that to take advantage
of the mid length runners a combination should
reach peak HP @ 7000 RPM Minimum up to 7500,
and shifting @ 7500 RPM Minimum up to 8000+
So I would consider LLSR & Top Tier Heads at a
minimum. Have some thoughts on a killer 416"
street/strip combo I will post in the other threads
if there is any interest.
10 Second Club
Joined: May 2009
Posts: 3,427
Likes: 227
From: over dere
And you have a butt-ugly avatar.
BTW.....I suppose you would believe that a gain of 12 HP at 300 RPMs higher, and a LOSS of 15 TQ is a significant gain. I would disagree.
Also, horsepower and torque below the curve suffers with the HP runners versus the full length runners.
Jus' sayin'........
KW
BTW.....I suppose you would believe that a gain of 12 HP at 300 RPMs higher, and a LOSS of 15 TQ is a significant gain. I would disagree.
Also, horsepower and torque below the curve suffers with the HP runners versus the full length runners.
Jus' sayin'........
KW