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Dynoing out the myth of Intake mods: The Results

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  #61  
Old 01-08-2011, 12:22 PM
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thanks SwivelHips, I appreciate it!

I'm currently running my custom lower plenum, 5/8 spacer, custom upper, z-tube, 06 rev up box w/ k&n drop in. I also matched the MAF to the air box. I need to go dyno again to see what the difference is.
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  #62  
Old 01-08-2011, 12:38 PM
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Rob is your car a REVUP motor?
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  #63  
Old 01-08-2011, 12:57 PM
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5AT, so no.
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Old 01-08-2011, 01:25 PM
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heh, not yet...

I'm pursuing a Revup swap with my 5AT
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  #65  
Old 01-08-2011, 02:33 PM
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dude just swap to 6mt while ur doin it
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  #66  
Old 01-08-2011, 04:18 PM
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I've considered it.
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  #67  
Old 01-08-2011, 04:22 PM
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Sounds like its time to buy a 6MT
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  #68  
Old 01-08-2011, 09:17 PM
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Cheaper and easier to buy a 6mt car and sell the 5at car.
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Old 01-13-2011, 01:51 AM
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I found this on another forums. I think it's sorta relevant. Funny to see that it was posted allllll the way back in October 2006:

http://www.350z-tech.com/forums/856061-post12.html

Quote:
I'd be very surprised if an intake makes any power gains on a 350Z, unless you're getting a CAI pickup (and even then it'll be marginal). The intake design is already as high flowing as you're going to get without just having a gaping hole from the front of your car going into your intake plenum.

With a conical filter instead of a panel filter, you're changing the way the air flows through the AFM. This can possibly give it bad readings, and reduce power.

And since its the factory exhaust that's the biggest restriction on OEM, replacing the intake will do very little for the engine's willingness to rev. If anything, all that extra noise, the perception that you'll see gains, and the general lack of revability will give you the impression that its slower.


My suggestion would be to reset the ECU so it drops its saved values and it can relearn from scratch. I still don't think you'll see any gains, though.

And get at least a catback exhaust. If you don't touch the oxygen sensors in the cats you should technically be OK from a warranty perspective (its all just "dumb" pipe work south of the cats so there's nothing that affects the sensor inputs going into the ECU) but make sure you clarify with your dealer. I reckon the guy you talked to is an idiot, or been burnt by too many guys running aggressive ECU tunes or cracking the engine.
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Old 01-25-2011, 01:55 PM
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i own the ONE filter that wasn't tested. FML haha


OP good stuff, i think the community owes you one.
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  #71  
Old 02-07-2011, 12:37 PM
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great write up
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Old 02-07-2011, 01:43 PM
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I really appreciate studies like this. Sometimes the results are so surprising and with numbers to back them up, there's no arguing. The methodology seems sound and consistent. Thank you for spending money and time! I'll paypal in a minute.

Regarding the stock numbers (baseline) you were running, this was with the z-tube and K&N filter - peak HP and TQ numbers, 237 and 219, respectively? If this is the case, I find it very interesting that the new OEM filter netted an astounding +8hp and -1tq. I would assume this was using a z-tube as well?

The port n' polished, upper and lower plenum, is beautiful

I may have missed this earlier, but do you feel the numbers would be slightly different if the avg. A/F ratios among the different intakes were more consistent with one another? It's just your one comment stuck out to me which re-iterates, imo, the importance of proper tuning and MAF calibration.

Quote:
Now my engine was already tuned so on the stock box the AFRs were around 12.8 where they should be; when we added intakes on my setup they got very rich. On a stock tuned VQ35DE the AFRs would be in the high 13s and I think it’s possible that the intakes causing the AFR’s to drop into the high 12’s would show a power gain
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  #73  
Old 02-07-2011, 02:55 PM
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z-tube was constant on intakes that didn't have a pipe provided.

It did seem that when the AVG A/F were higher the power was usually better.
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  #74  
Old 02-07-2011, 03:54 PM
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Quote:
Originally Posted by msommers View Post
I really appreciate studies like this. Sometimes the results are so surprising and with numbers to back them up, there's no arguing. The methodology seems sound and consistent. Thank you for spending money and time! I'll paypal in a minute.

Regarding the stock numbers (baseline) you were running, this was with the z-tube and K&N filter - peak HP and TQ numbers, 237 and 219, respectively? If this is the case, I find it very interesting that the new OEM filter netted an astounding +8hp and -1tq. I would assume this was using a z-tube as well?

The port n' polished, upper and lower plenum, is beautiful

I may have missed this earlier, but do you feel the numbers would be slightly different if the avg. A/F ratios among the different intakes were more consistent with one another? It's just your one comment stuck out to me which re-iterates, imo, the importance of proper tuning and MAF calibration.
The numbers with the new OEM filter were with the modded plenums installed.
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  #75  
Old 02-07-2011, 10:41 PM
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Sorry I interpreted the modded plenums were on there for baseline with the z-tube/K&N filter and also the OEM filter/z-tube.
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