When does the Fast intake become a restriction?
When does the Fast intake become a restriction? At what point does the Fast 90 combo become a restriction? Im running a 422 with AFR 225's, a Fast 90 combo and a 259/267@50 on a 115lsa cam.
It made 550/504 Rwhp/Tq but peaked at just 6300 Rpm. I have been told the Fast 90 is a restriction at this point and I would be better off with a Beck sheet metal piece or simmilar.
Any thoughts?
It made 550/504 Rwhp/Tq but peaked at just 6300 Rpm. I have been told the Fast 90 is a restriction at this point and I would be better off with a Beck sheet metal piece or simmilar.
Any thoughts?
On The Tree
Joined: Jul 2007
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Please don't flame this response... I am new and not 100% knowing...
But... From a 422 and a cam of that size... Arn't those peak numbers a little low? Especially with AFR heads?
Arn't there people with 346 and 242ish cam's with peak numbers around 470/480? But not that great under the curve?
If the Fast 90/90 is bottle-necking that engine, shouldn't he see a big gain by going to a sheet-metal intake.
I am by no means insulting Jeremiahs build, so please don't take this the wrong way...
But I am just trying to recall peak numbers I see people posting with in various forums.
Hope no one takes offense to that, Its very easy to take the above in the wrong direction, but I can't figure out a better way to re-word it at 1am... =]
But... From a 422 and a cam of that size... Arn't those peak numbers a little low? Especially with AFR heads?
Arn't there people with 346 and 242ish cam's with peak numbers around 470/480? But not that great under the curve?
If the Fast 90/90 is bottle-necking that engine, shouldn't he see a big gain by going to a sheet-metal intake.
I am by no means insulting Jeremiahs build, so please don't take this the wrong way...
But I am just trying to recall peak numbers I see people posting with in various forums.
Hope no one takes offense to that, Its very easy to take the above in the wrong direction, but I can't figure out a better way to re-word it at 1am... =]
Originally Posted by BigB02Z28
Please don't flame this response... I am new and not 100% knowing...
But... From a 422 and a cam of that size... Arn't those peak numbers a little low? Especially with AFR heads?
Arn't there people with 346 and 242ish cam's with peak numbers around 470/480? But not that great under the curve?
If the Fast 90/90 is bottle-necking that engine, shouldn't he see a big gain by going to a sheet-metal intake.
I am by no means insulting Jeremiahs build, so please don't take this the wrong way...
But I am just trying to recall peak numbers I see people posting with in various forums.
Hope no one takes offense to that, Its very easy to take the above in the wrong direction, but I can't figure out a better way to re-word it at 1am... =]
But... From a 422 and a cam of that size... Arn't those peak numbers a little low? Especially with AFR heads?
Arn't there people with 346 and 242ish cam's with peak numbers around 470/480? But not that great under the curve?
If the Fast 90/90 is bottle-necking that engine, shouldn't he see a big gain by going to a sheet-metal intake.
I am by no means insulting Jeremiahs build, so please don't take this the wrong way...
But I am just trying to recall peak numbers I see people posting with in various forums.
Hope no one takes offense to that, Its very easy to take the above in the wrong direction, but I can't figure out a better way to re-word it at 1am... =]
I have heard I could expect 40-60 more HP on the top end with a loss on the lower end. Being a six speed car and the way I drive I dont think I will miss the low end loss.
I know there are some NA 346 cars making those kind of numbers but the average I have seen with a 242ish cams are in the 420 Rwhp range give or take.
I had hoped for more power from my set up but over all I am very pleased.
As of right now im leaning to the Beck set up but I would still like to hear some more thoughts/oppinions.
Thanks guys!
Originally Posted by studderin
yup. a good port job to feed the heads better would be beneficial on that setup.
Originally Posted by Jeremiah
I know there are some NA 346 cars making those kind of numbers but the average I have seen with a 242ish cams are in the 420 Rwhp range give or take.
Either way, in your case that FAST 90 is a restriction.
Re'
Get the beck setup and then make a charitable contribution to my car with the donation of your FAST 90/90 setup! It will be the best thing you will have ever done for another human being and will immediatly qualify you for a free pass into heaven. How could you go wrong???
But yeah, your motor is big enough to want to breathe enough for the FAST to be a restriction. Another option might actually be to convert a LS carb manifold (like the Edelbrock intake) to a FI intake with a 90* elbow off of the carb plate so you can mount an very large TB, then have the intake drilled for the injectors. A friend of mine did this with great success and very impressive power gains on his wifes race car (12secSS on here)
Good luck with it though, and for what its worth, you may end up with similar gains with the carb intake over the sheetmetal piece, but it would cost you a lot less.
Then again, theres always Harrop, if you can find one!
But yeah, your motor is big enough to want to breathe enough for the FAST to be a restriction. Another option might actually be to convert a LS carb manifold (like the Edelbrock intake) to a FI intake with a 90* elbow off of the carb plate so you can mount an very large TB, then have the intake drilled for the injectors. A friend of mine did this with great success and very impressive power gains on his wifes race car (12secSS on here)
Good luck with it though, and for what its worth, you may end up with similar gains with the carb intake over the sheetmetal piece, but it would cost you a lot less.
Then again, theres always Harrop, if you can find one!
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Originally Posted by SVTHuh
Then again, theres always Harrop, if you can find one!
IMO the Beck is a much more practical piece and far better suited to my needs. It also doesnt require a custom air intake, its far easier to work on/around and has zero moving parts to give you problems down the road.
I have heard once you get the Harrop dialed in its a killer set up and some have shown killer gains with it. I just dont think its a practicle piece for an F-body.
I havnt completely ruled out the possibility of a carbed style intake. It looks like more people like the GMPP intake over the Edelbrock piece and it fits under the cowl plenum better than the victor.
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