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Thread: Injectors Maxed out (333cc/E60 MAF)

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Posts: 1-10 of 13
2011-11-21 17:53:09
#1
Injectors Maxed out (333cc/E60 MAF)
Injectors duty cycle should not be beyond 90% for safety, right?

How about this:




Is it time then to up the fuel pressure to 4 BAR?

Also, does this mean my VE is approaching 226WHP?
Last edited by gtswrx on 2011-11-24 at 14-46-51.
2011-11-21 18:18:14
#2
Yeah, add some pressure and you'll be able to drop your duty cycle down.


Also are you sure your running the right afr or is it just super rich and that's why its using so much fuel.
2011-11-21 18:33:52
#3
I wouldn't wanna be pushing over 90%. I hit 89% on my JWT/DE/Cams.
2011-11-21 19:40:09
#4
Also your battery/alternator voltage will determine how well your injectors work too.
2011-11-22 21:37:53
#5
Originally Posted by cory
Yeah, add some pressure and you'll be able to drop your duty cycle down.


Also are you sure your running the right afr or is it just super rich and that's why its using so much fuel.


Well, yeah, check the AFR table, it is from the same datalog as the injectors: INJ_DUTY vs AFR match.

I thought of making the pressure 4bar but then I noticed the Nismo FPR twists together with the screw (it's crap). I changed back to the VE stock FPR at 44 psi.

Originally Posted by Vadim
Also your battery/alternator voltage will determine how well your injectors work too.


This is true and since my battery is in the trunk voltage may be lower than normal.



OK, I know I'm not pushing 226WHP, but something weird happens with my tune (and/or something is wrong with my car ). If I use the base E60 bin Calum made, it goes so lean at high rpms is not even funny with the 12AFR values in there. I have to fill the fuel map with 10AFR values so it gets near 13:1 actual AFR.

What I did in order to get fuel maps AFRs to be more similar with actual AFRs for ease of tuning is to alter (add to) the VE Map without changing the K Value so cruising is not affected. Up to 6800 rpm, 12.98 in the fuel map gives me around 13 actual AFR. At 7200 and above it just doesn't and I still have to lower it to 11s to match 13 actual. This has some cons:

1. Injectors are maxing out (but not before altering the VE Map and getting the same 13 Actual AFR)

2. B_Fuel Schedule tops at 255, meaning all ECU fuel calculations are maxed out.

3. MAF Voltages read higher with this setting (MORE POWA???), despite timing and actual AFR curves (aiming for 13) are practically equal.
2011-11-22 21:39:42
#6
Originally Posted by Viprdude
I wouldn't wanna be pushing over 90%. I hit 89% on my JWT/DE/Cams.


That's the "something's wrong" part, these are for a VE with its stock 333cc injectors.
2011-11-23 14:13:24
#7
Maybe my injectors are clogged. This would make sense, what you guys think?
2011-11-24 02:23:04
#8
I think we are in a similar boat. I was so insanely lean in the medium and upper RPM ranges with some Calum bins I was using for my VE. I still see AFR's in the 16's and 17's at times. I have richened the map up a great deal and still goes lean at times. It is getting better though. I am going to richen it up some more in the trouble spots and see what happens. I have the table in the low 12's in the high RPM range yet I still see 14's and 15's near redline.

Are you on N1 cams? I still have the SR20VE cams in my motor. I haven't seen injector duty cycle get higher than 67 or 68% I don't think. I hope this doesn't mean I'm only making 150ish WHP!!

Which bin are you using? My bin is a modified N60 VE bin. I switchd the MAF VQ table for the E60 MAF I am using.
2011-11-24 14:41:16
#9
I see, but that's when just switching VQ Tables doesn't work. Here attached are two bins, I think from Calum, and same injectors but different MAFs gives you very different K Numbers.

OBDII
N60 K=250
E60 K=308

Yes, mine has N1 cams at 0/0 and my base was the E60 bin attached, but the current one I'm using is highly hacked by now.
Last edited by gtswrx on 2011-11-24 at 14-49-40.
2011-11-24 18:37:11
#10
log a VE yesterday AFRs at WOT was in the 11s with 96% duty cycle after 6800 rpm
i am thinking it is due to the fact that AFRs needs tidying up but could calculating for air fuel ratios in the mid to high 11s send duty cycle all the way to 96%?

vehicle had in N1 cams
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