4 inch CAI
12-03-2012, 03:19 PM
#121
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^^^ I recently started monitoring my AFR so I am not sure about your situation....
but now that i think about it (and thinking out loud)...when i did the intake side mods I was getting amazingly awesome mpg...(maybe from being lean)...the exhaust side mods did reduce my mpg a little bit....i also blamed it on my right foot but its good to know there were other factors involved...
but now that i think about it (and thinking out loud)...when i did the intake side mods I was getting amazingly awesome mpg...(maybe from being lean)...the exhaust side mods did reduce my mpg a little bit....i also blamed it on my right foot but its good to know there were other factors involved...
12-03-2012, 07:17 PM
#122
Team Owner
With the whole lean/rich thing, I assume you're only talking in regards to if the car is stock and you slap a CAI on it.
Before I had the 3.7 manifold/TB I was running hella rich at 11.6 with all my exhaust mods. Once I went to the larger intake manifold I leaned to 12.3-ish
Before I had the 3.7 manifold/TB I was running hella rich at 11.6 with all my exhaust mods. Once I went to the larger intake manifold I leaned to 12.3-ish
12-03-2012, 07:23 PM
#123
Team Owner
^^^ I recently started monitoring my AFR so I am not sure about your situation....
but now that i think about it (and thinking out loud)...when i did the intake side mods I was getting amazingly awesome mpg...(maybe from being lean)...the exhaust side mods did reduce my mpg a little bit....i also blamed it on my right foot but its good to know there were other factors involved...
but now that i think about it (and thinking out loud)...when i did the intake side mods I was getting amazingly awesome mpg...(maybe from being lean)...the exhaust side mods did reduce my mpg a little bit....i also blamed it on my right foot but its good to know there were other factors involved...
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swoosh (12-03-2012)
12-03-2012, 11:30 PM
#124
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The only possible way the AF can change from intake mods other than the TB is if you're bringing in cooler air and the car was detonating before the mod. You need to monitor knock retard to get the whole picture. Exhaust mods should do nothing but improve mpg and power. If the piston doesn't have to push as hard on the upstroke and during overlap you get more exhaust out and more intake in for less "natural egr" you make more power and mpg. I'm not intending to preach just bored. I'm in the middle of a move and at the new place there's no tv or computer or even a place to sit so this phone and acurazine is all I have lol.
Matt, that makes a lot of sense....back then i didnt even know what compression ratio is
now I am monitoring and logging multiple parameters....
12-04-2012, 08:59 AM
#125
Burning Brakes
The only possible way the AF can change from intake mods other than the TB is if you're bringing in cooler air and the car was detonating before the mod. You need to monitor knock retard to get the whole picture. Exhaust mods should do nothing but improve mpg and power. If the piston doesn't have to push as hard on the upstroke and during overlap you get more exhaust out and more intake in for less "natural egr" you make more power and mpg. I'm not intending to preach just bored. I'm in the middle of a move and at the new place there's no tv or computer or even a place to sit so this phone and acurazine is all I have lol.
12-04-2012, 03:35 PM
#126
Burning Brakes
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Is this at full throttle or normal driving? How long after the manifold was this af taken? The problem with a larger throttlebody is you're letting considerably more air in at partial throttle, especially right off idle. It's similar to that old electronic product that throttle enhancer that opened the throttle more for a given pedal input. The result was improved responsiveness and the perception that the car is faster. As you get closer to full throttle the effect is less and less. What's different with the larger TB is the ECU does not know you're doing what amounts to opening the throttle more than its aware of. While this can have a fairly large effect on part throttle AF ratios it can also cause problems with tip in performance and cause a slight stumble when you first hit the gas. It would effect the AF just because the throttle is opening more than the ECU realizes but I'm surprised the 02s have not taken care of the issue unless there hasn't been enough time.
01-09-2013, 01:23 PM
#128
Pro
Thread Starter
01-15-2013, 09:49 AM
#130
All motor
So this is long overdue, but figured I should post this here as well. This is my before/after 4" CAI dyno. Keep in mind I am FBO including the 3.7 IM/TB, so my gains will differ from those who don't have the 3.7 setup. However, if you do have the 3.7 setup, a 3.5 or 4" CAI is a must. There is power to be made everywhere.
Graph is below. This is a long CAI with velocity stack compared with my AEM V1. Red is the V1 and blue is the 4". As you see, there are gains literally everywhere minus the last 200 RPM.
Graph is below. This is a long CAI with velocity stack compared with my AEM V1. Red is the V1 and blue is the 4". As you see, there are gains literally everywhere minus the last 200 RPM.
01-15-2013, 10:07 AM
#132
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Sonnick wanted to ask you this since a while....
how is the band below 3K? the dyno doesnt show that and i bet most of us while city driving shift around 3-3.5K
how is the band below 3K? the dyno doesnt show that and i bet most of us while city driving shift around 3-3.5K
01-15-2013, 11:55 AM
#134
All motor
No idea about the temps, never checked nor have the equipment to check.
In terms of low end, it feels about the same as it was prior to the 4". Not sure that my butt dyno is all that accurate though. I will say this: I haven't really had the chance to get on it from low RPM in 1st gear because of the cold weather and lack of traction. Now, I definitely noticed increased low end after the 3.7 IM with the butterflies intact compared to my ported manifold with them removed. I can't say I've noticed (or had the chance to test) the low end the same way I was able to after the 3.7 setup.
In terms of low end, it feels about the same as it was prior to the 4". Not sure that my butt dyno is all that accurate though. I will say this: I haven't really had the chance to get on it from low RPM in 1st gear because of the cold weather and lack of traction. Now, I definitely noticed increased low end after the 3.7 IM with the butterflies intact compared to my ported manifold with them removed. I can't say I've noticed (or had the chance to test) the low end the same way I was able to after the 3.7 setup.
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swoosh (01-15-2013)
01-15-2013, 11:58 AM
#135
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^^^ Thanks for the honest answer....
yeah the dyno didnt show anything below 2.5K rpm's and hence made me curious....
yeah the dyno didnt show anything below 2.5K rpm's and hence made me curious....
01-15-2013, 12:31 PM
#136
Pro
Thread Starter
So people are up to date. I may be given a job offer this friday, IF I'm offered the job I will take it and will be working 6 days a week. So, if I get the job will not have time to make these. I could make a few here and there but not enough to support the vendor charge every month.
01-15-2013, 12:34 PM
#137
Just take a look at the intakes p2r sold for the j32. 4" that has a long taper down to 3".
It showed gains from 2.5k rpms all the way to redline. He was just a 3.2 with bolt-ons and a tune making over 300 whp. Heads were stock, just bored tb, ported im, ported runners,long tube headers, and 3 inch single exhaust.
01-15-2013, 01:04 PM
#138
Burning Brakes
No idea about the temps, never checked nor have the equipment to check.
In terms of low end, it feels about the same as it was prior to the 4". Not sure that my butt dyno is all that accurate though. I will say this: I haven't really had the chance to get on it from low RPM in 1st gear because of the cold weather and lack of traction. Now, I definitely noticed increased low end after the 3.7 IM with the butterflies intact compared to my ported manifold with them removed. I can't say I've noticed (or had the chance to test) the low end the same way I was able to after the 3.7 setup.
In terms of low end, it feels about the same as it was prior to the 4". Not sure that my butt dyno is all that accurate though. I will say this: I haven't really had the chance to get on it from low RPM in 1st gear because of the cold weather and lack of traction. Now, I definitely noticed increased low end after the 3.7 IM with the butterflies intact compared to my ported manifold with them removed. I can't say I've noticed (or had the chance to test) the low end the same way I was able to after the 3.7 setup.
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Sonnick (01-15-2013)
01-15-2013, 01:30 PM
#139
Pro
Thread Starter
So this is long overdue, but figured I should post this here as well. This is my before/after 4" CAI dyno. Keep in mind I am FBO including the 3.7 IM/TB, so my gains will differ from those who don't have the 3.7 setup. However, if you do have the 3.7 setup, a 3.5 or 4" CAI is a must. There is power to be made everywhere.
Graph is below. This is a long CAI with velocity stack compared with my AEM V1. Red is the V1 and blue is the 4". As you see, there are gains literally everywhere minus the last 200 RPM.
Graph is below. This is a long CAI with velocity stack compared with my AEM V1. Red is the V1 and blue is the 4". As you see, there are gains literally everywhere minus the last 200 RPM.
01-15-2013, 02:13 PM
#140
All motor
Lol I haven't spoken to Woot in awhile. How did he find out? That sneaky bastard 
lol. He's a real cool dude, and very knowledgeable as well.
Around there, yea. I'd say 5-8whp/tq throughout the range and 10 in some spots. However, I'm sure the velocity stack added a few HP as well. My intake is also a solid 6" longer than the V1, which may have attributed to the large midrange gains and minimal gains up top.
And I agree with the taper remark....I think if I would've tapered the intake down at the TB I would've made a couple more HP, but you can't argue with these gains.
lol. He's a real cool dude, and very knowledgeable as well.Around there, yea. I'd say 5-8whp/tq throughout the range and 10 in some spots. However, I'm sure the velocity stack added a few HP as well. My intake is also a solid 6" longer than the V1, which may have attributed to the large midrange gains and minimal gains up top.
And I agree with the taper remark....I think if I would've tapered the intake down at the TB I would've made a couple more HP, but you can't argue with these gains.
Last edited by Sonnick; 01-15-2013 at 02:15 PM.
01-15-2013, 02:16 PM
#141
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I wanted to do the velocity stack....but the panty hose filter scared the shit out of me LOL
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Sonnick (01-15-2013)
01-15-2013, 02:22 PM
#142
Pro
Thread Starter
Lol I haven't spoken to Woot in awhile. How did he find out? That sneaky bastard lol. He's a real cool dude, and very knowledgeable as well.
Around there, yea. I'd say 5-8whp/tq throughout the range and 10 in some spots. However, I'm sure the velocity stack added a few HP as well. My intake is also a solid 6" longer than the V1, which may have attributed to the large midrange gains and minimal gains up top.
And I agree with the taper remark....I think if I would've tapered the intake down at the TB I would've made a couple more HP, but you can't argue with these gains.
lol. He's a real cool dude, and very knowledgeable as well.Around there, yea. I'd say 5-8whp/tq throughout the range and 10 in some spots. However, I'm sure the velocity stack added a few HP as well. My intake is also a solid 6" longer than the V1, which may have attributed to the large midrange gains and minimal gains up top.
And I agree with the taper remark....I think if I would've tapered the intake down at the TB I would've made a couple more HP, but you can't argue with these gains.
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swoosh (07-10-2015)
07-10-2015, 06:25 PM
#144
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FUCKING SICK!!!!
07-24-2015, 09:59 AM
#150
Sorry guys on no diy, I'm lazy as shit lol! Rockwest composites for carbon tube, mandrel bending solutions for elbows/reducer. Got their carbon look stuff which wasn't good enough so I wrapped them with 5d carbon vinyl including wrapping ss couplers (should help keep the wrap on). Butt dyno feels maybe 2 hp coming from aem v2 and a bit louder.
07-24-2015, 04:54 PM
#151
Confusing Name Guy
Sorry guys on no diy, I'm lazy as shit lol! Rockwest composites for carbon tube, mandrel bending solutions for elbows/reducer. Got their carbon look stuff which wasn't good enough so I wrapped them with 5d carbon vinyl including wrapping ss couplers (should help keep the wrap on). Butt dyno feels maybe 2 hp coming from aem v2 and a bit louder.
11-03-2015, 09:29 AM
#155
11-06-2015, 01:42 PM
#156
Chapter Leader (Southern Region)
03-10-2019, 12:08 AM
#158
Bumping this for all the new guys. Nowadays you can find 4" carbon 90's. You would just need 3 to 4" coupler, straight 4" tube (enough for top and bottom section), 4" 90, and two 4" couplers and the intake of your choosing
04-08-2019, 10:25 PM
#160
Where are you finding the 4" carbon? Just pulled the trigger on the 3.7 TB and Mani swap. Are there any kits for cai? Amongst my search, have only come across a guy who makes sri kits.