|
|
SUPPORT ZPOST BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER, THANKS! |
Post Reply |
|
Thread Tools | Search this Thread |
12-15-2012, 04:07 PM | #89 |
#buildnotbought
12620
Rep 5,278
Posts |
Well to go further in p0171 and a VF570 install:
http://www.m3forum.net/m3forum/showt...p?p=1065722726 This guy has that code (which he didn't notice because his aftermarket istalled gauges blocked the light ), but I dont know the details of his setup (He says its mafless). Could be unrelated to the pump of course. Not much info in that thread. Maybe the problem is discussed elswhere in more detail. Off topic or not....I'm not having this discussion by myself.... Last edited by GuidoK; 12-15-2012 at 04:36 PM.. |
Appreciate
0
|
12-15-2012, 06:01 PM | #90 | |
Captain
58
Rep 913
Posts |
Quote:
|
|
Appreciate
0
|
12-15-2012, 08:10 PM | #91 | |
Colonel
492
Rep 2,784
Posts
Drives: ESS/G-Power Z4M, VF Z4, 996tt
Join Date: Sep 2009
Location: Los Angeles
|
Quote:
__________________
|
|
Appreciate
0
|
12-15-2012, 08:25 PM | #92 |
Colonel
492
Rep 2,784
Posts
Drives: ESS/G-Power Z4M, VF Z4, 996tt
Join Date: Sep 2009
Location: Los Angeles
|
You were out of parameters, and I was trying to reel you back in. In the meantime, the off-topic condition still existed, potentially damaging the thread. tikamak threw the check light because the condition exceeded the threshold.
Actually, I do appreciate the discussion, and you're obviously fairly knowledgeable. When two knowledgeable people come to different conclusions, the best thing to do is to start to pick their brains and find out why, because both can learn something.
__________________
|
Appreciate
0
|
12-15-2012, 09:16 PM | #93 | |
Captain
162
Rep 892
Posts |
Quote:
__________________
CURRENT ll F10 M5 l E85 Z4MR l I01 i3 REX SOLD ll E70 X5M l E85 Z4MR VF570 l E36/7 Z3MR l E36 328i |
|
Appreciate
0
|
12-16-2012, 03:49 AM | #94 | |
Major General
428
Rep 5,329
Posts |
Quote:
how many miles you on now?
__________________
Z4MR VT2 - Clubsport build.
Multi award winning Detailing | Wrap | PPF specialists UK based - www.topwrapz.com |
|
Appreciate
0
|
12-16-2012, 07:36 AM | #95 | |
Colonel
492
Rep 2,784
Posts
Drives: ESS/G-Power Z4M, VF Z4, 996tt
Join Date: Sep 2009
Location: Los Angeles
|
Quote:
1. ECU adds what it thinks is the correct amount of fuel, based on the map. 2. O2 sensor reports a lean condition. 3. ECU increases duty cycle to add more fuel. 4. O2 sensor continues to report a lean condition. 5. ECU continues to increase duty cycle to add still more fuel... eventually going over 100%. I think you're right about something telling the ECU it needs less fuel, rather than the car not being able to supply enough. Hopefully VF will clear it up. They recommended I get a Bavarian Technic tool when I had some minor issues with my car (ended up being install error), so maybe it will be my next purchase.
__________________
|
|
Appreciate
0
|
12-16-2012, 11:55 AM | #96 | |
Car Geek
4131
Rep 3,829
Posts |
Quote:
If the data logging in this case is giving true information, the fact that fuel pressure doesn't move from 6 bar would indicate that fuel flow demand is being met. I would expect that if fuel demand couldn't be met, as the injector open time increases, the pressure could not be maintained due to flow limitations. A slight possibility of maintaining constant pressure but still not meet fuelling demands could be due to pipe constrictions between the pressure measurement point and the fuel injectors, but this would be remote due to fuel pressure normally being measured in the fuel rail itself. Rated, do you have any more data logging information available (such as fuel trim, throttle position, etc)? Also, I may have missed it, but does your installation make use of wideband O2 sensors, or is it using the standard OEM ones? Last edited by aerobod; 12-16-2012 at 12:03 PM.. |
|
Appreciate
0
|
12-16-2012, 11:57 AM | #97 | ||
Captain
162
Rep 892
Posts |
Quote:
Either way, bigger lines and an inline pump can only help and aren't all that expensive. I'm just curious as to the the effects of doing so with the computer controlled FPR. Here's what the guy, in the thread I linked to, did with his fuel system (he's running 12 psi though with meth, but experienced the same lean issues like I am before the upgrade). 42lb injectors Aeromotive 340 sealth fuel pump (best choice) larger fuel lines and relay. Aeromotive fuel filter Walbro inline fuel pump AA bigger Fuel Rails Aeromotive Fuel Press. Regulator (3bar) 50/50mix boost jucie Meth spary at 2.5psi to redline using .630cc jet FPR gauge at idle reads 63-64lb. (with 60lb inejctors it should be at 43lb of pressure) Quote:
__________________
CURRENT ll F10 M5 l E85 Z4MR l I01 i3 REX SOLD ll E70 X5M l E85 Z4MR VF570 l E36/7 Z3MR l E36 328i |
||
Appreciate
0
|
12-16-2012, 01:31 PM | #98 |
Major General
428
Rep 5,329
Posts |
ohh god....
i really am going to have to do the fuel system upgrade i was hoping to avoid :-( Rated, im with you on this one tho, if we start changing lines ect ect.... how much scope does our computer controlled FPR have?? id like to think the intank aero 340 intank would be more than enough for our usage. i wish someone just did an upgrade "kit" that had everything we need to do a fuelling upgrade.... i i'd love to get some proper specs on our fueling system in terms of pump flow ect ect.
__________________
Z4MR VT2 - Clubsport build.
Multi award winning Detailing | Wrap | PPF specialists UK based - www.topwrapz.com |
Appreciate
0
|
12-16-2012, 03:25 PM | #99 |
#buildnotbought
12620
Rep 5,278
Posts |
Wouldn't it be easier to ask VF engineering the afr map they put in your ecu?
I think they can just mail you a print/screenshot depending on software. Then you know for sure if there's something wrong or that it's in the tune itself. |
Appreciate
0
|
12-16-2012, 03:56 PM | #100 |
Captain
58
Rep 913
Posts |
I think AJ from ESS didn't do it because our fuel pump is controlled by the ECU and it will cost more in terms of R&D to tune it out as opposed to the E46 M3 platform.
Someone correct me if i'm wrong. |
Appreciate
0
|
12-16-2012, 04:41 PM | #101 |
#buildnotbought
12620
Rep 5,278
Posts |
Is it controlled (as in speed controlled) by the ecu?
I think the pressure regulator is passive with vacuum control? Edit: WDS says so (pulse widh modulation) (still a vacuum pressure regulater is in place I think; there is a procedure with tools to check fuel pum[p pressure vs. pressure regulator pressure) Control takes place via the diagnosis CAN, so maybe you can monitor it with inpa or progman (never seen it in inpa, but also never bothered to look ). But I can't imagine the fuel pump not running @100% on WOT and +6500 revs. Last edited by GuidoK; 12-16-2012 at 04:52 PM.. |
Appreciate
0
|
12-16-2012, 08:43 PM | #102 | |
Captain
162
Rep 892
Posts |
Quote:
__________________
CURRENT ll F10 M5 l E85 Z4MR l I01 i3 REX SOLD ll E70 X5M l E85 Z4MR VF570 l E36/7 Z3MR l E36 328i |
|
Appreciate
0
|
12-16-2012, 10:11 PM | #104 | |
Captain
162
Rep 892
Posts |
Quote:
__________________
CURRENT ll F10 M5 l E85 Z4MR l I01 i3 REX SOLD ll E70 X5M l E85 Z4MR VF570 l E36/7 Z3MR l E36 328i |
|
Appreciate
0
|
12-17-2012, 06:06 PM | #106 |
Captain
162
Rep 892
Posts |
More interesting info:
I graphed the injector duty cycles for runs 3-5: Z4M VF570 duty cycles 3-5 by M detaR, on Flickr They plateau at ~73-75% Also, the M3 VF570 kit uses 52lb/hr injectors while the Z4M kit uses 41lb/hr injectors. This is most likely due to the different FPR, but still interesting.
__________________
CURRENT ll F10 M5 l E85 Z4MR l I01 i3 REX SOLD ll E70 X5M l E85 Z4MR VF570 l E36/7 Z3MR l E36 328i |
Appreciate
0
|
12-17-2012, 07:46 PM | #107 |
Second Lieutenant
13
Rep 280
Posts |
I not an injector guru, but shouldn't they be able to up the duty cycle to closer to 100??
If a fuel system upgrade is needed, it's not that much more money - relatively speaking of course. Can't you bypass the factory PWM control, and run 100% all the time with an aftermarket pump / relay? That, a filter, fpr, and some nice lines - you'd be good to go - right? I was hoping to hear that you talked to VF and they said ..... |
Appreciate
0
|
12-17-2012, 09:49 PM | #108 | |
Captain
162
Rep 892
Posts |
Quote:
VF should be contacting me tomorrow.
__________________
CURRENT ll F10 M5 l E85 Z4MR l I01 i3 REX SOLD ll E70 X5M l E85 Z4MR VF570 l E36/7 Z3MR l E36 328i |
|
Appreciate
0
|
12-18-2012, 05:17 AM | #109 |
Lieutenant
24
Rep 428
Posts |
I'm on bf.com monitoring your thread there too....I hate issues like this, especially after just being installed, so good luck to you.
With the idea of stock fuel lines being too restrictive...I'm not too sure you want to go that route just yet. The bottom line is, VF released this kit, ready to go as is. They would have noticed this issue and replaced the fuel lines too. This is a MAF based system, correct, and not a MAP based? If the engine runs lean at higher RPM, I'm either looking at some kind of air restriction going on, or perhaps the FPR/fuel pump cannot keep up and is failing. The engine is seeing "x" amount of air, and is delivering "y" amount of fuel. "Y" is either correct according to the tune, according to what the ECU thinks the engine is seeing via the MAF, or what is limited by the fuel system. Here is how I'd attack it and whenever I have problems on my turbo M3, this is my methodology: 1) Vac test.....usually, in boost, the engine will run rich because the accounted for air is leaking out in boost, but the fuel has already been provided...still, always check first and eliminate this as a potential issue...many people also want to assume away this problem...smoke test! 2) Fuel pressure check...what should it be idle, accelerating, in boost? Need to verify the fuel pump, FPR, injectors are all in compliance. Good luck, and please let us know what you find out once this is resolved!
__________________
1997 /// M3 Coupe Arctic Silver CES STAGE IV (651rwhp/615rwtq)
1999 /// M3 Convertible Techno Violet |
Appreciate
0
|
12-18-2012, 07:09 AM | #110 | ||
Colonel
492
Rep 2,784
Posts
Drives: ESS/G-Power Z4M, VF Z4, 996tt
Join Date: Sep 2009
Location: Los Angeles
|
Quote:
Quote:
Edit: I'm not where I heard this, and I'm reading different information on VF's website.
__________________
|
||
Appreciate
0
|
Post Reply |
Bookmarks |
|
|