Modding SFR Manifold/Need Feedback
04-02-2015, 11:55 AM
#1
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Modding SFR Manifold/Need Feedback
I'm currently running the SFR manifold on my 2005 Altima SE-R 6spd. I'm looking into modifying it to get more out of it.
1. For instance I have the 75mm TB and 4" intake and I would like to go 3.5" on the manifold's elbow because it's a bit smaller than my throttle body and I feel it's restrictive.
2. I'm also considering increasing the length of the runners 1/4" or so but wondering if I need to increase the box the elbow runs into volume as well.
3. I've heard kinetics runs velocity stacks on the runners of there manifold and I've considered building some velocity stack in to the runners as well.
Should I do all three? Or start with one modification at a time???
Please give me your opinions, advice, personal experience, etc. Thanks guys.
1. For instance I have the 75mm TB and 4" intake and I would like to go 3.5" on the manifold's elbow because it's a bit smaller than my throttle body and I feel it's restrictive.
2. I'm also considering increasing the length of the runners 1/4" or so but wondering if I need to increase the box the elbow runs into volume as well.
3. I've heard kinetics runs velocity stacks on the runners of there manifold and I've considered building some velocity stack in to the runners as well.
Should I do all three? Or start with one modification at a time???
Please give me your opinions, advice, personal experience, etc. Thanks guys.
04-02-2015, 01:29 PM
#3
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Of course I have the spacers but I want mor3 lol. Well that is what I'm doing, building a custom Mani. SFR is the the best base I can get to start with. That's why I'm wanting to modify it. I'll have a welder make a copy of the SFR but change the elbow, add velocity stacks, and lengthen runners
04-02-2015, 08:05 PM
#4
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Join Date: Feb 2013
Posts: 218
Longer runners are the wrong direction for more power up top. A little water injection and you can get pretty aggressive with the tune also.
Install a vacuum gauge in the plenum, and do some WOT pulls. If you have 1 inch or less of vacuum, at WOT a bigger elbow, and TB....etc....isn't going to help very much as it shows no restriction.
Install a vacuum gauge in the plenum, and do some WOT pulls. If you have 1 inch or less of vacuum, at WOT a bigger elbow, and TB....etc....isn't going to help very much as it shows no restriction.
Last edited by WTF?; 04-03-2015 at 07:21 AM.
04-03-2015, 08:22 AM
#5
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Your correct. After researching I found that shorter runners on manifold make more horsepower on the top end of your power band and longer runner make more torque/hp lower in the powerband. I think I'm going to do away with the NWP spacer making the runners shorter to see if I gain HP up top. I'm not familiar with water Injection, so I wouldn't know where to start. The project at hand is how to make the SFR better. Thanks for the tips.
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