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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Dyno: aFe Pro-Dry S Intake VS Stock Air Box



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      09-06-2008, 07:15 PM   #23
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This is quite disappointing. Now I am more curious to see the "oiled" filter dyno. I wonder if anyone can ever duplicate the AFE's results, or at least come close. If not, AFE should probably remove its claimed numbers or else be guilty of false advertising.
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      09-06-2008, 09:27 PM   #24
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Another set of dyno results here -> http://www.e90post.com/forums/showpo...4&postcount=51

Perhaps the results are different once you're dealing with more boost?
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      09-06-2008, 09:36 PM   #25
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Quote:
Originally Posted by superlubricity View Post
Another set of dyno results here -> http://www.e90post.com/forums/showpo...4&postcount=51

Perhaps the results are different once you're dealing with more boost?
Yea i think so too..more boost means more air.

AFE intake will definitely run better with more boost.

This is why people say that aftermarket intake is not need with stock performance.

I need more boost too

Don't they increase gas mileage even with stock performance?
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      09-06-2008, 09:59 PM   #26
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I would wait for additional tests before jumping to conclusions. This needs to be tested using the aFe first, then stock box, and it needs to be tested on several cars.

The tuners were suggesting that aftermarket intakes only provided benefits at very high airflow demands.
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      09-06-2008, 10:16 PM   #27
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I lost a good bit of low end with my 330i, but mid range and top feel better

Intakes are really only for sound, unless you got tune, dps, exhaust and stuff
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      09-06-2008, 10:19 PM   #28
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how come the other guy with oiled filters and the swoop scoops gained 14 whp ?

mayb its the cooler air hmmm
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      09-06-2008, 10:30 PM   #29
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Quote:
Originally Posted by stressdoc View Post
I would wait for additional tests before jumping to conclusions. This needs to be tested using the aFe first, then stock box, and it needs to be tested on several cars.

The tuners were suggesting that aftermarket intakes only provided benefits at very high airflow demands.
You all may be right about the gains being noticeable only on tuned cars. Unfortunately my personal plans for anything beyond an exhaust system will wait until next year. So in the meantime I have an intake I won't be using, which I may as well return or sell, especially if there's a time limitation on returning it.

If other testing shows that gains can be had with higher boosted cars, then I'll revisit intake solutions when the time comes for it. I just didn't expect such a dramatic loss even on an otherwise stock car. I'd probably keep it in good faith that it would produce results later if it had even just put up the same numbers as the stock air box.
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      09-06-2008, 10:33 PM   #30
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Quote:
Originally Posted by ericsmc83 View Post
You all may be right about the gains being noticeable only on tuned cars. Unfortunately my personal plans for anything beyond an exhaust system will wait until next year. So in the meantime I have an intake I won't be using, which I may as well return or sell, especially if there's a time limitation on returning it.

If other testing shows that gains can be had with higher boosted cars, then I'll revisit intake solutions when the time comes for it. I just didn't expect such a dramatic loss even on an otherwise stock car. I'd probably keep it in good faith that it would produce results later if it had even just put up the same numbers as the stock air box.
Keep us posted. Curious as to if the vendor will take care of you or not. That's the true test of customer service . . . after the sale.
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      09-06-2008, 10:53 PM   #31
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This is why when ppl ask what mod they should get first, ~ 99.9% of the more experienced E90Posters say "ecu tune -- piggyback or flash first, and other mods later." Although this and a couple other dynos are disappointing, I really would like to see another 2 more with the oiled aFe intake on tuned 335i's. If adding this intake GAINS ~ +10WHP/10-15 lb.-ft. RWTQ, then I think most ppl will be happy with its performance in addition to its looks.
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      09-06-2008, 11:04 PM   #32
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I updated the original post with the raw data and better graphs.
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      09-06-2008, 11:09 PM   #33
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Another aFe dyno that lost power. This one with JB3 tune.

http://www.n54tech.com/forums/showthread.php?p=22700
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      09-07-2008, 12:41 AM   #34
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You spent 300 dollars for nothing.
not quite, he spent $300 to lose power!
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      09-07-2008, 12:41 AM   #35
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First off, I'd like to thank the OP for providing these results.
Thanks for putting in the time and money so we can see.

I was talking with Terry the other day about intakes, tunes, etc, and we believe that an intake will help those greatly with DPs, and not with those who are stock.
Obviously we have seen those who have dyno'd their stock car with and without the AFE, and we have seen poor results, but I strongly believe that the results are different with my car or any car who has DPs and a tune.

I'd really like this test to be done on a car with a tune and DPs.
If I see a decrease then I'll be the first to say that I was wrong.
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      09-07-2008, 12:54 AM   #36
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Ok first did you have any type of fan setup in front of the car with the hood closed? This would simulate more "real" conditions.....the reason why people fell better throttle response while driving and better "butt dyno" resluts is because air is comming into the engine bay at a much higher rate. Not to mention cooler air also.
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      09-07-2008, 01:31 AM   #37
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Quote:
Originally Posted by Mr. 5 View Post
First off, I'd like to thank the OP for providing these results.
Thanks for putting in the time and money so we can see.

I was talking with Terry the other day about intakes, tunes, etc, and we believe that an intake will help those greatly with DPs, and not with those who are stock.
Obviously we have seen those who have dyno'd their stock car with and without the AFE, and we have seen poor results, but I strongly believe that the results are different with my car or any car who has DPs and a tune.

I'd really like this test to be done on a car with a tune and DPs.
If I see a decrease then I'll be the first to say that I was wrong.
No problem! Glad I could help.

+1 to needing lots more dynos.

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Originally Posted by camaross305 View Post
Ok first did you have any type of fan setup in front of the car with the hood closed? This would simulate more "real" conditions.....the reason why people fell better throttle response while driving and better "butt dyno" resluts is because air is comming into the engine bay at a much higher rate. Not to mention cooler air also.
Yes, they had lots of fans setup. FWIW, the dyno with the slightly higher numbers pulled from the aFe setup was with the hood closed. I honestly don't remember which of the stock air box runs was with the hood closed.
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      09-07-2008, 01:33 AM   #38
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I know everyone keeps saying that a tuned car will be better with an intake. That may be the case. But there is no reason that a stock car should lose power. Im sure more boost will love the better flowing intake but stock should be no diffrent.
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      09-07-2008, 01:42 AM   #39
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I know everyone keeps saying that a tuned car will be better with an intake. That may be the case. But there is no reason that a stock car should lose power. Im sure more boost will love the better flowing intake but stock should be no diffrent.

Its simple the car in stock form (stock boost, no dp's) was designed and tunned that way. With a stock airbox operating in a vaccum like fashion.

I also dont think its just a tune that will see gains from an intake but also dp's

An engine is just simply a pump. If you add more air comming in its not going to help any if your not getting more air out and vice versa.

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      09-07-2008, 03:40 AM   #40
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if thats the case then i think im gonna take off my afe intake and dyno my car with all the mods i have and then redyno with the afe to see if with a tune and a couple more mods the car gains anything from the afe
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      09-07-2008, 03:58 AM   #41
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if thats the case then i think im gonna take off my afe intake and dyno my car with all the mods i have and then redyno with the afe to see if with a tune and a couple more mods the car gains anything from the afe
i think that would be fair...although I think dp's would help
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      09-07-2008, 04:02 AM   #42
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WOW.. so my review on the "butt dyno" actually tricked me. Just because my throttle response on the AFE was excellent, I guess it just felt like my car was quicker in performance as well. So.. I purchased the RPI scoops a couple days ago. That proves to have 8~15 hp gains at 40+mph. Sorry to kind of thread jack, but is this advertisement true??

If this one's wrong as well, then I spent a total of half a G for nothing.. lol.
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      09-07-2008, 04:31 AM   #43
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Intake also reduces the boost psi.

Aftermarket intake will decrease the stock boost about 0.5-1psi.

That's what i heard.

Maybe lower boost, that's why ?
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      09-07-2008, 07:24 AM   #44
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Okay, I'm dissapointed with the results here with the AFE setup. I was trying to put my stock air box back in , but can seem to get the openings to stretch far enough over to clamp down on the snorkles? Anyone here have a good way to do this? Thanks.
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