[ElectronVTEC]

I've read that the 2G MAS reads 22% lower than a 1G mas. What's confusing me is how I interpret the numbers I get on my Emanage datalogger. For instance, with my 60 trim i'm now seeing around 2300 Hz (though it's really, really spiky/erratic, more on that in a minute). Should I take that 2300 and multiply it by 1.22 to get the Hz that a 1G MAS would see? Just curious, I know it doesnt mean THAT much, but I try to use the airflow numbers to make sure it's tuned alright.

Secondly, with 650's, rewired 190lph, and -6 AN line into the rail, there's no way I should be running lean on 16 psi from this turbo right (92 octane)? My knock is almost out of control, my O2's on the pocketlogger start at .88 at 5000 RPM and hit .67 by 5700 RPM, which is when my knock skyrockets and my timing gets flushed down to 7 (yay). Any ideas? Overrunning the MAS (doubting that a lot)? Bad 02 sensor? If it were a bad o2 sensor, that shouldn't affect the amount of fuel going in should it? Lastly and I *think* this might be key - my net duty cycle on my emanage is coming it at.... gulp.... 110%. How the hell does that happen? The thing pulls like a raped ape from 4K to 5K, and then just wham, dead on its face as I knock to oblivion and reach near 1000 deg. C EGT's. Any ideas, hints, suggestions? I sure as hell could use some right about now... Todd.

 

[ElectronVTEC]

Also, I've only got a rewired 190 fuel pump, is it time for a 255? I coulda sworn I've seen 190's make quite a bit more power than what I'm around, but i'm just curious. Thanks, Todd.

 

[ElectronVTEC]

Alright, I pulled the plugs today. 1 & 2 look alright if not a hair lean, #3 is really lean, and #4 is definitely lean but nowhere near as bad as #3. Any ideas here? Bad injector? The thing I don't understand is that my emanage is trying to shove 110% DC at these things and the numbers for that just don't add up the way I have it running. I fixed a few vacuum leaks but nothing major. Compression still checks out as 150 across, so apparently no harm has been done. Any ideas whatsoever? Thanks, Todd.

 

[92tealTSI]

Hey Todd.

How much fuel pressure are you getting on your gauge? Have you changed that 02 sensor since you bought the car? I know running race gas can kill your 02 sensors fairly quick. Just thought i'd throw a couple ideas out there. Also, seeing that your #3 plug is leaner than #4, that is definately a sign of some weird shit going on, cause normally plugs 3 and four should be the least lean. hm...

 

[flubyux2]

Your injectors shouldnt be running that high of a DC, especially if they are 650's.

You probalby just dont have the fuel flow/pressure to supply the big injectors. Try getting a big fuel line from the Filter to the fuel rail, and bump up the fuel pressure to maybe 40 psi, Base. But, the higher the fuel pressure goes, the LESS volume the pump can push, so that would also explain why its running lean in the top end: the engine is trying to consume MORE fuel up there than 3000-4000 even though it is the same fuel pressure (Based on boost). I would go for a 255HP, they flow a tad more fuel given the same pressure than the STD 255.

the only way i can think of your 3 and 4 plugs running lean like that would be cuz of the injectors. like he said, the 1 and 2 would normally be running lean but you said they look fine. The only other culprit would be a mis-firing/malfunctioning injector. 110% DC will do that to an injector. itll cause it to die over time to.

also, spiky-erratic air flow counts IS characteristic of MAF overrun. Maybe youwanna invest in a MAFT? MAF overrun wil cause a lean condition cuz the ECU reacts to what the MAF sees, so if it loses counts, then the fuel injectors follow suit and taper off the fuel.. and thatll make it go lean and cause you to see what youre seeing now.

the O2 sensor shouldnt really affect how your car runs when you are gettin all up on it (open loop operation). the only time it has anything to do w/ the engine operation is during closed loop, and the ECU looks to it for feedback.

 

[ElectronVTEC]

Ok, here's the latest. It seems that a lot of the problems were weather related, false-knock related, and vacuum-leak related. I dug into everything more yesterday and sorted out a couple things. I re-logged the car yesterday afternoon and at 22 psi (the weirdness all happened at 15-16) I was seeing 17 deg. of timing at 7000 in 3rd with about 10 knock counts. Not perfect but *way* better. Also my EGT's were sittin at 850 at the top of 3rd.

My logger has been acting up lately - above 20 psi, the O2 sensor reads 0.00V on WOT. After some intense searching, this seems to be related to the 190 just not being enough for what I need. I've got a 255HP coming tomorrow.

False-knock - my shifter cable bracket was almost completely loose and was most likely the reason that I was getting knock on a launch while I slipped out the clutch (i'd post up the log of it, but my PLViewer aint workin). After I tightened that down, I'm seeing 5 counts at around 6500 in 3rd gear at 21 psi.

What I'm thinking is that if it was falseknocking (like, 43 counts), it was pulling so much timing that it caused my whopping 1000C EGT's which would easily turn my plugs white. 1000C is damn hot after all.

Also, I know what's goin on with the Inj. D/C. The emanage is jacking up the math on my net D/C, by my math it's more like 90% which is still too high, but hopefully the pump will fix that. That's all for now, Todd.

 

[loreak]

when i installed my 2g mas my hz didnt change on the afc, i just added 21% across the board and logged it and it pretty much ran the same as it did before the mas

but on the afc i was getting like 1900ish on 1g mas and i thought what you did, my hz would be 21% lower so they would read like 1600 or something but they are still 1900.......i dont know its weird

 

[flubyux2]

It still reads 1900 HZ cuz you bumped up the airflow via the AFC so your ECU is seeing the same airflow count as before, cuz you have to add that fuel in w/ the AFC. if you ahd the 550s, they would cancel eachother out and you wouldnt need to add that much fuel, if you lowered it, your Hz count as seen by the ECU would also lower.

When i plugged in my 2G MAS and 550s, i could leave the AFC at 0 and it would run like it did when it was stock... it would need soem fine tuning, but itd run, it wouldnt be overly lean like a 2G mas on stock injectors would be. the problem is that you are still running close to the fuel cut since you ahd to jack the fuel way up while using the stock 450s