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  #1  
Old 04-17-2010, 03:47 PM
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Best intake manifold performance mod

I hear and see a lot about intake manifold mods such as port and polish with a 90mm T.B., a carburetor manifold and even a full replacement from http://www.xvmotorsports.com/product...x.cfm?nPID=272

I know for a fact long tube headerwith high flow cats is a guaranty 20hp to the rear wheels if tuned right.

Just looking for the best option for a more air in mods on top of the motor with out a power add on supercharger ect.
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Old 04-17-2010, 04:06 PM
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Re: Best intake manifold performance mod

I would do a OE port and 90MM TB. The OE manifold is nice it just needs a good cleaning of the inside and a port match. I definitely felt a gain I haven't got any numbers yet but I'm sure when I put a 90 mm TB their will be good gains shown. I've heard their is a power loss NA with em. If you want to go all out get an OE Extrude Hone Manifold and a good port match and that will be hard to beat.
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Old 04-18-2010, 04:51 PM
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Re: Best intake manifold performance mod

Thanks for the useful info.
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Old 04-25-2010, 01:41 PM
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Re: Best intake manifold performance mod

Actually the stock mani does not flow well. Thats been proven. It barely flows enough for a stock motor, let alone a modded one. Porting and Extrude Honing helps somewhat, but its still iffy. It really depends on who does the porting. If its done "too well" you will lose power. There needs to be some roughness left intact to keep the air turbulant. The fuel is injected in the ports and if theres no turbulance, it won't mix with the air properly and you'll lose power.
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Old 08-25-2010, 05:54 PM
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Re: Best intake manifold performance mod

I got this baby waiting to go on my truck now (and a bigger cam, pushrods, plugs, coils, etc). Screw porting; been there, done that (and still offer it to others). Time to extend the record another couple tenths. I'll give up some low end torque for the top end surge.





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Old 08-26-2010, 06:09 AM
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Re: Best intake manifold performance mod

I'd think the stock beer keg is decent for n/a and what you have there good for f/i if done correctly. I always wonder about the obstruction just in front of the opening that allows for stock location of the t/b. The results have been mixed for f/i, perhaps because of tuning and individual operator, and consistently negative for n/a applications. If I had to guess why, its because the stock beer keg does more for air velocity than this does, but at higher air flow in f/i, this one permits more air to be delivered.
If I had a turbo on my car, I think I'd want one of these just because it damn looks good.

Looking forward to results.
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Old 08-26-2010, 07:22 AM
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Re: Best intake manifold performance mod

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Originally Posted by muellge View Post
I'd think the stock beer keg is decent for n/a and what you have there good for f/i if done correctly. I always wonder about the obstruction just in front of the opening that allows for stock location of the t/b. The results have been mixed for f/i, perhaps because of tuning and individual operator, and consistently negative for n/a applications. If I had to guess why, its because the stock beer keg does more for air velocity than this does, but at higher air flow in f/i, this one permits more air to be delivered.
If I had a turbo on my car, I think I'd want one of these just because it damn looks good.

Looking forward to results.
X2 I have yet to see a N/A application with that manifold work. For FI I can see that working well. There is a good article in one of this months Mopar magazines about Ram tuning, its history and theory. I think the Keg, ported correctly is still a viable choice. Has anyone played with shortening the runners on the keg, to raise the peak torque/HP RPM range? I would think that would compliment an aftermarket cam well. Stock everything is designed to compliment each other, when you change one piece of the puzzle, you have to change every piece of the puzzle to get it "right"
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Old 08-26-2010, 07:46 AM
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Re: Best intake manifold performance mod

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Originally Posted by Mike_Levy View Post
I got this baby waiting to go on my truck now (and a bigger cam, pushrods, plugs, coils, etc). Screw porting; been there, done that (and still offer it to others). Time to extend the record another couple tenths. I'll give up some low end torque for the top end surge.
I love the look of that mani, I know 1BAMFR had it installed and then removed it. Supposedly it only helped high in the rpms, so maybe if you raise your shift point to 7500-8000rpms it would be a lot more beneficial.

What record are you referring to?
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Old 08-26-2010, 12:21 PM
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Re: Best intake manifold performance mod

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Originally Posted by philthyphil View Post
I love the look of that mani, I know 1BAMFR had it installed and then removed it. Supposedly it only helped high in the rpms, so maybe if you raise your shift point to 7500-8000rpms it would be a lot more beneficial.

What record are you referring to?
Thats exactly what I'm expecting with it, just gains on the top end, which is where my motor dies. I'm also putting in a 4 hole carb spacer to increase the velocity somewhat.

The record is the Natural aspirated, stock displacement Jeep SRT8. Keoni had it at 11.93 or 94, then I ran 11.91, so supposedly, I have it now. I'd really like to get it down to the 11.70's before I stroke. But better yet, maybe somebody can break it so I have no reason not to.
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Old 08-30-2010, 02:05 PM
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Re: Best intake manifold performance mod

I will break that record for you Mike then you can just move on to the stroker
Only problem is its hot as hell and humid down here in Houston and you and Murfman are the ones I am chasing so dont expect much from me
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Old 08-30-2010, 03:21 PM
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Re: Best intake manifold performance mod

Think you can do it this week? Arrington has all their stroker short blocks on sale, and I'd like to pick one up.
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