Maxed Out Air Flow Meter @ 170rwkw?

[InterCooL]

hey guys

i have dyno'd my r33 s1 and got a very rich 170rwkw. basic mods, fmic, exhaust, coilpacks, STOCK boost / turbo

i finally hooked up some data logging equipment and found out my air flow meter is hittin 5.1v at 6000rpm (just when my AF ratio plummets to 10.5)

now its fairly safe now obviously, besides clogging my cat and killing my wb02, but this leaves no head room for me what so ever if i wish to run a bit more boost and reep some more KW

i thought the AFM would go to 190-210rwkw before i started having headroom issues? is this normal?

and i have spent HOURS hunting down boost leaks, only ever found one AGES ago

[TTT]

170rwkw @ 7psi?.

[InterCooL]

7-8psi, sorta leaks. but yes. no controller

[TTT]

what revs does it make the 170rwkw at?

also, can you test a mates AFM to see if it does the same thing?

Is the AFM clean?

Edited February 22, 2008 by GTST

[InterCooL]

yeah i can try my mates, ill do that

i cleaned my afm with proper elec contact cleaner 6 months ago, didnt think it'd need cleaning again

here is my dyno, it isnt logged to rpm's tho

[DECIM8]

wait.. i retract that one lol

Edited February 22, 2008 by DECIM8

[InterCooL]

k

Edited February 22, 2008 by InterCooL

[Tangles]

ex-tuners insisted mine was "going" at 140awkw.

replaced it with z32 afm, wont look back.

[bubba]

Man that's running pretty rich.. it goes lower than 10:1 but they haven't scaled it so you can see exactly where it goes..

[Lithium]

Man that's running pretty rich.. it goes lower than 10:1 but they haven't scaled it so you can see exactly where it goes..

Looks like a boost leak to me. Turbo is drawing air in through the AFM but the air isn't making it to the engine as it is escaping somewhere - so the ECU is pouring fuel in to suit the amount of power you SHOULD be making/the amount of air that should be making it to the motor but since the airs not there you are just running really rich.

Times like this I wish I had an AFM, as I think I *might* have a boost leak though not too sure.

[moobaque]

hey guys

i have dyno'd my r33 s1 and got a very rich 170rwkw. basic mods, fmic, exhaust, coilpacks, STOCK boost / turbo

i finally hooked up some data logging equipment and found out my air flow meter is hittin 5.1v at 6000rpm (just when my AF ratio plummets to 10.5)

now its fairly safe now obviously, besides clogging my cat and killing my wb02, but this leaves no head room for me what so ever if i wish to run a bit more boost and reep some more KW

i thought the AFM would go to 190-210rwkw before i started having headroom issues? is this normal?

and i have spent HOURS hunting down boost leaks, only ever found one AGES ago

Does sound like your AFM has either bit the dust or like i think has already been mentioned, has a leak causing incorrect metering to the ecu

Testing with someone elses known working AFM is going to be a great test but you could also simply try taking off your AFM and giving it a good once over with some CRC Contact Cleaner!

170rwkw @ 7psi?.

I had similar mods before i put a boost controller in and i was getting 185rwkw (exhaust, pod, fmic, but tuned with a power fc)

i would assume this was due to the turbo back exhaust, but my stock solenoid was now running my car at 9-10psi.

i've got my old dyno sheet somewhere on my floor no doubt

[TTT]

Not sure how you tested for boost leaks but here is a cheap way to do it and very effective.

http://www.vfaq.com/mods/ICtester.html

I'm sure almost everyone could make one of those..

[InterCooL]

Not sure how you tested for boost leaks but here is a cheap way to do it and very effective.

http://www.vfaq.com/mods/ICtester.html

I'm sure almost everyone could make one of those..

thats how i tested mine. hardest thing about doing that test is the fact that there is a million breather pipes that come off the intercooler piping and vent to the intake manifold and the engine. i could only pressurise the system for maybe 5 secs at a time. but had unlimited amount of air so i spent ages doing it. only found one leak and fixed that.

ill try a mates afm, then maybe put my smic back on, see if that changes my a/f ratio and my afm readings.

cheers guys

[Adriano]

Running those mixtures, im not surprised that its maxing out, if the mixtures were good, it would probably make another 20-30rwkw. What are the dyno tuners using to tune it? Management?

[swanny180]

How would mixtures affect an airflow meter's reading? Its purely based on the amount of air flowing through it, which is related to the size of the turbo and amount of boost being run, not the tuning though.

Better mixtures would help make a bit more power though as you've said.

Also, the management currently is stock ecu, no remaps or anything (Id hate to see 10:1 mixtures on a so called 'tuned' ecu )

And Pegg, Ill lend you my AFM for a bit and you can take it for a whirl, see if that makes a difference. Msg me

[Adriano]

How would mixtures affect an airflow meter's reading? Its purely based on the amount of air flowing through it, which is related to the size of the turbo and amount of boost being run, not the tuning though.

Better mixtures would help make a bit more power though as you've said.

Also, the management currently is stock ecu, no remaps or anything (Id hate to see 10:1 mixtures on a so called 'tuned' ecu )

And Pegg, Ill lend you my AFM for a bit and you can take it for a whirl, see if that makes a difference. Msg me

Exactly my point, the engine may be using 200rwkw worth of air, but because it is drowning, it makes significantly less power. That combined with the severely retarded ignition timing that it would be running explains the power loss. You really need to get some management in it.

Edited February 22, 2008 by Adriano

[VB-]

he said hes got a boost leak, the AFM is seeing 200rwkw worth of air, but the motor isnt