b13speed

Is this an offtopic question?

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Ericdd

any opinions????

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nizzan4u2nv

^^you would have to dyno to determine whether you need to boost your fuel pressure a bit. Mind you, it cant be done with an safc, you would need to actually dyno on a wide band O2.

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choaderboy2

Let me repeat that you need to test your car's A/R ratio using a real UEGO or Horiba wideband O2 sensor, not one of those autometer, haltech, MSD or other cheap meter that uses a stock type O2 sensor or the factory sensor.

You cant trust the dynojet wideband either, that sucker is way off. Any of the stick up the tail pipe units is suspect as well as I think there is a lot of dilution that far back on the exhaust.

AEM has a cheap wide band that uses a DMM as the readout. It works quite well and is cheap.

Mike

Ericdd

Why didn't you do any testing with the stillen CAI. I think it's one of the best crafted CAI, along with the AEM (not offered for my car). The place racing and hot shot, have no mounting brackts and have pretty cheap looking MAF adapters and filters. The only reason the stillen isn't more widely used is it cost more. The stillen uses the same size piping as the AEM as well.

choaderboy2

Sorry for not satisfying your every whim

Mike

Pretty White

So would an AEM V2 style made up on our MAF cars make a difference? I just saw it on the site looking for a A/F meter (Thank you Mike!)


Now where do you put the O2 sensor?

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choaderboy2

I unscrew the stock o2 sensor and screw in the bosch uego. Since you car is in open loop at WOT, it doesnt matter that you lose your closed loop.

Warning: If you have an exhaust leak, it screws the reading all up, same if you have a slip flange header.

Mike

jetpilot

621$ for that reader

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Quote:
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Originally Posted by JustinP10
Does rotating the MAF so the sensor location changes in respect to the bend of the pipe affect anything?
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I have read posts that rotating the MAF 90 degrees from stock (hot wire on top) gives small gains in torque. It may be possible to slightly tweak your A/F ratio depending on MAF positioning along the intake tract AND its orientaion (hot wire up/down or right/left). What's best will depend on what you are trying to achieve and your intake--stock, not stock.

Air flow can differ in the area of the MAF, but more importantly, in the area of the hot wire within the MAF. The flow can differ in two ways. It can be turbulent or laminar (i.e., rougher or smoother, respectively), and it can also be slower or faster. Fast, laminar flow will result in the highest MAF voltage, and slow, turbulent flow, the lowest.

The factory fuel maps that a stock ECU uses will be based on readings from a factory intake and MAF positioning. A hypothetical situation: the stock MAF location/positoning may put the hot wire in an aera of slight turbulance and medium air speed as a result of the curves, bends, and surface irregularities of the intake tract and MAF body. The factory then programed the ECU with fuel maps based on MAF readings from that location.

If you were to rotate the MAF or somehow change its position so the hot wire was now located where the flow was more laminar (a.k.a. less turbulent) and or faster, but the overall air flow to the engine stays the same, this would result in a richer A/F mixture because the MAF is reading more flow, but actual intake air flow remains the same--only the MAF reading location changed, not anything that would affect the overall intake flow.

So how do you position the MAF to, in theory anyway, change A/F ratios? Air (or water) speed is faster on the outside of a curve, thus greater flow. So if you want the leanest possible mixture and there is a curve in the intake tract ahead of the MAF, rotate the MAF so the hot wire is on the inside of that bend. For rich, go to the outside. Trying to figure areas of turbulance or laminar flow is much more difficult, but if this procedure can have any noticable effects, which, according to the posts I mentioned at the beginning, is entirely possible, than this is a simple enough procedure to try some different positioning and see if it helps or hurts.

L8R

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AaroNX

So what's the chances of anyone ever dynoing each of these intakes with the POP on the end of them?

Also, I have the PR CAI but at the begening of the thread where Mike K. describes how each is made, he described mine as the HS. The MAF is really close to the TB, and after the piping goes into the fender it turn's towards the front of the car. Well at least it used to, before I hacked it off to use the POP.

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choaderboy2

My hotshot has the MAF closer to the TB and the filter tilts forward so the filter sort of tilts at a 30 degree angle. My PR has the MAF firther from the TB and the fitler points straight down.

The PR gives the most gains at 5500-6000 and my Hotshot peaks higher and has slightly less midrange. The Hotshot leans out the mixture and has higher MAF voltage and makes about 4 more peak hp than PR and 6 more than AEM with a custom ecu program.

I tested Hotshots filter vs Hotshot CAI with POP and there was no power difference. The POP aapeared to be a higher quality element and seemed like it would filter better, this is just subjective though and I have no data to support this.

Mike

chimmike

very interesting. Do you think the filter angle has anything to do wiht midrange power? or is it mainly MAF position from the TB and piping?

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AaroNX

Ok this is what the HS is supposed to look like,
http://www.hotshot.com/intakes/NS4001.htm
and this is the in PR one that I have
http://www.placeracing.com/splash/nissan.php

The Maf is clearly closer on the PR piping. Is there any chance that maybe you have a different HS intake? Maybe one that was made for testing purposes?

eric96ser

That picture on the HS site is of a low port intake.

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Subculture

Just for the record. The picture shown is of the older model PRI CAI.

The newer ones come with the Monster Flow filters.

PRI claims that the Monster Flow makes a bit more HP over the K&N type filters.

AaroNX

This is the elbow between the TB and maf on my PR CAI.


Eric that's a good point I didn't think about that, also though Mike may be talking about a low port.

choaderboy2

No but I have a real old PR intake, like maybe the second low port ever made so there is a posiblity that mine is different than whats out now.

Here is my PR intake

http://www.wes.nissanpower.com/photo2.html

As you can see, its farther away than the HS and the pictured PR. Nevermind the Hotshot sticker, its a PR, didnt have a place to put my HS sticker!

I can't find a picture of my Hotshot intake on the car anywhere but its closer.

Mike

AaroNX

Ok that brings another question though, do you think the gains between intakes would be different for low port and high port motors?

choaderboy2