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Dynoing out the myth of Intake mods: The Results

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  #46  
Old 12-17-2010, 10:38 AM
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IDK of I can spare $5..... I could manage 100 shiny nickels though
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  #47  
Old 12-17-2010, 10:56 AM
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Rob, I think your testing approach was spot on. You tried to reduce as much bias as possible and most importantly, you kept all tests consistent. I applaude and appreciate your efforts.
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  #48  
Old 12-17-2010, 11:01 AM
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Quote:
Originally Posted by broke_as_ajoke View Post
Ok I have a question if I'm understanding this right..the AFR should be in the high 12's?
Now here is my next question when i got my intake and 5/16 spacer I wanted to have my car dynoed to find out how much the HP and TQ the car actually had.. The numbers I got are very different as far at the HP avg goes. I got 196 hp avg, 184 tq avg, and AFR 12.8

After the install of the spacer and intake. I got 202 hp avg, 189 tq avg, and AFR 13.0
So would u say if I changed out the air box to the stock air box i would get more gains since the MAF will sense all the air coming into the intake in one direction?

Wait that doesn't make since once the air passes threw the filter it is traveling in one direction towards the MAF. So the ECU should not be "fooled" which one not cause the car to dump more fuel into the throttle body (carburetor ole skool car guy).
Maybe the VQ35 is different, but with the VQ30s, we saw the best numbers (with aftermarket ECUs or piggybacks) by having the AFR at a relatively lean 15:1 ratio slowly dialing itself as the rpms went past 5000rpms. The AFR ultimately would go to around 12.5:1 as you approached redline (6600-7200rpms depending on your setup). A constant AFR of ~12:1 to 13:1 killed power in the low to midrange.
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  #49  
Old 12-17-2010, 01:06 PM
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thanks for all the compliments guys, It really helps to make it feel like this was worth my time. I had so many people telling me I was wasting time and money, and it started wearing on me.

I didn't do this expecting any crazy gains (there wasn't) I just needed a starting point to see how intakes affect our engine. I'm going to start trying to design a manifold around the experience I've gained from others and my own testing. something gaining a reliable 5 hp/tq over my current setup would make me happy.

also posted up my paypal address if any of you guys are kind enough, I will accept it and put it towards future research.
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  #50  
Old 12-19-2010, 04:30 AM
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dont lose ur smokes over it....
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  #51  
Old 12-19-2010, 09:02 PM
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First off I wanted to thank you for taking your time out to do these tests and show how much of an enthusiast you are to the VQ35DE community. Major applause as well to a great interesting write up. I do have one question though.. it might be a question other members few like asking as well.. I see that you stated that you will be running your stock box with a k&n drop in filter. But would you say from your experience and test that a aftermarket CAI with a tune would out perform a stock ztube/k&n filter tune? I ask this bc I would like to know if I should stick with my stock before my tune or bite the bullet and buy a CAI and get the tune to yield out better power?

I made a thread about this but everything still seems misleading so I would liek you to chime in with your experience.
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  #52  
Old 12-20-2010, 01:01 AM
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I think it's possible, but not proven, and maybe not worth the cost.

I've read that the stock box flows well up to 300rwhp or so, a number that many will never see N/A

I know there are gains to be had with a 3" MAF when tuned properly so I'm getting a 3" pipe made with an integrated MAF and I'll get it tuned and the MAF scaling in properly to see what gains I'll get on my freshly cammed car.
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  #53  
Old 12-20-2010, 06:53 PM
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what size is the stock MA?

a lil off topic, when u do cams and a tune what type of gains do you expect to see/ what are normal gains from this mod?

Cost of it? lol i know i know
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  #54  
Old 01-03-2011, 04:17 PM
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thanks for this thread rob! it was very informative!
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  #55  
Old 01-07-2011, 07:29 PM
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Intuitively the open cone filter intakes shouldn't make the AFR richer. I would think that additional air flow would make things leaner. I also noted that the end run with the paper oem filter was also rich. Of course if the paper filter is restrictive than it ought to he leaner as well. But it is not and it made more power than the kn drop in filter.
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  #56  
Old 01-08-2011, 01:19 AM
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yeah but that was with the Z tube not just the K&n Drop in
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  #57  
Old 01-08-2011, 08:23 AM
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I also read the dyno graph captions. The final run was with the modded plenums installed so it isn't comparable to the first run power wise.
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  #58  
Old 01-08-2011, 10:49 AM
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Wow. Great job on the data. Very helpful!
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  #59  
Old 01-08-2011, 10:58 AM
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Haven't been back in a while, Rob; noticed you posted your paypal so I slipped you a couple bucks for your trouble.
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  #60  
Old 01-08-2011, 11:03 AM
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Rob, so what setup will you be running on your car after all this testing?
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