[TurboQueef]

Hi..

I finally decided to get the K&N Typhoon intake in an effort to help my air flow through the engine. I noticed a marked increase in MAF voltage which would indicate that the speed of the air going past the sensor has increased. I guess the question now is... has the actual air flow through the engine increased or is it just a matter of the speed of the air being faster due to a smaller intake tube or some other factor.

My question to you guys: Has anyone studied the matter to figure out why the MAF voltages increased?

Here is log that shows before and after MAF v's

[STI5150]

^^^You definately have more air flow. What type of MAF does the sti have vane or hotwire? Voltage should increase if you have more air flow. Looks like your almost max voltage (5) i believe. What about fuel? Did the ECU adjust for the increase in air flow?

[jays05]

You're running a lot more boost with the typhoon. I'd try reducing boost levels to around where you were on the stock intake. Then watch the MAF voltage, and also your AFR's with the wideband. That should give you a better indication if you're making more boost, actually flowing more air through the motor, or just making it look that way by throwing off the maf calibration.

[WolfPlayer]

^^^ Affirmative. Your turbo doesn't have to work as hard to pull in air. So, it is pulling it in easier and making more boost.

t

[TurboQueef]

Originally Posted by STI5150

^^^You definately have more air flow. What type of MAF does the sti have vane or hotwire? Voltage should increase if you have more air flow. Looks like your almost max voltage (5) i believe. What about fuel? Did the ECU adjust for the increase in air flow?

Thanks for the reply.. I am not sure what kind of MAF it has... sorry about that.

Regarding AFR.. it stayed the same which was my indicator that the actual flow of air through the engine was more. My original worry was that the K&N tube may have been smaller diameter causing the same "flow" of air to speed up causing for higher MAF sensor voltage. But if that was the case, the AFR would have gone rich (cause the ECU would see higher MAF voltage and increase pulsing of injectors).

The true test will be at the track on Friday night.. I will post results

[TurboQueef]

Originally Posted by jays05

You're running a lot more boost with the typhoon. I'd try reducing boost levels to around where you were on the stock intake. Then watch the MAF voltage, and also your AFR's with the wideband. That should give you a better indication if you're making more boost, actually flowing more air through the motor, or just making it look that way by throwing off the maf calibration.

Good info Jay... thanks.. I will give that a try at the track on Friday.. Say, can you give me a high level understanding of how the MAF calibration works...

Thanks

[crystal_Imprezav]

If your numbers are too high in the calibration table then you will hit a higher load, have positive fuel trims, and run rich. If they are too small then the opposite will happen and you will run lean. I have found that with the typhoon, it really isnt necessary to adjust the intake calibration. I have messed around with a whole bunch of calibrations and the stocker seems to be the most consistant. I just lower the fuel targets by a couple of points until I get back to my targets then lower the WGDC tables until my boost is back on point again.

[TurboQueef]

Went to the track on Sunday.. they were running a beat the heat race, I attached a couple of photos of me blowing away a cruser... see below>

Regarding the K&N performance... I am getting more air to flow through the engine... basically, I now have the same performance on 93 octane as I was achieving a few months ago with GT100 race fuel.

The timing advance is still messing with me but I am getting the 105+ trap speed. Was running 13 flat due to mega tire spin. Also.. I had trouble with the K&N loosening up and sucking air (after the MAF).. this caused ugly AFR's (12.5 to 1 )

I am still not getting the air flow as Shawn (overboost) so I ordered a cat-less downpipe yesterday... I expect this will get my performance same as his.

So... the bottom line: The Typhoon helped my airflow a lot... 4.5 max stock to 4.56~58 with K&N.

[mug23]

Is that a actual cop car you blew away? That's so funny!!!

[disturbed1]

damn that is a nice pass. like the car.

[klaymon]

That cruiser looks legit (still has lights on it). Is it some public relations vehicle, like the D.A.R.E. cars?

[TurboQueef]

Originally Posted by mug23

Is that a actual cop car you blew away? That's so funny!!!

Yea, actual cop cars were there for the race... it was a blast...

I must admit it was a bit unsettling looking in my rear view mirror at 105+ and seeing the cop car with lights on trying to catch me...

[WolfPlayer]

Now rip out that typhoon and install an APS 70mm CAI

t

[TurboQueef]

Originally Posted by WolfPlayer

Now rip out that typhoon and install an APS 70mm CAI

t

Is it really better?

((( some don't flow as good due to longer travel and bends in tubes ))). It took my a long time to decide on the K&N... I hate the fact it "sucks" air from under the hood so close to the engine.. that still has me concerned... I wonder how much tuning is required to compensate for the size diffie.. do you know???

Thanks,

jb

[WolfPlayer]

IMHO, the tuning on the APS Big MAF was easy. Car runs awesome. I have a post with the values I used. You may be able to plug these values in and roll from there The 70mm is definitely going to flow more air than the 65mm intake.

You're fine with the typhoon though. It was more of a joke than anything else. Now, if you install the APS Turbo Inlet, THEN I would say you should seriously consider swapping out to the 70mm intake because the APS Turbo inlet is 76mm (and why choke that off with a 65mm intake?!).

t