2001 CLK55 AMG - 223K Miles : 1999 Land Rover Discovery Series II - 259K miles - 4th engine : 1996 328i Convertible 89K Miles (The wife's) : 2005 Outback Wagon 203K Miles (also The wife's)
I think the firmware just supports the use of the AFM. I assure you, it was the first thing I took out.
Last edited by ZenitramNaes; 01-05-2015 at 01:00 PM.
'89 535i/5 Holset WH1E turbo
Follow my m106 megasquirt build thread here
Follow my R75/6 build here. Youtube - Dispatch Moto
Tuning a car with an Air Flow Meter vs a MAP sensor is a much better option, providing the AFM isn't a restriction on the intake, and it is of a modern design unlike the original Vane AFM.
It accurately measures air temp/density and amount, compared to a vacuum signal the MAP sensor provides.
It really sounds like you're talking about a MAF or MAS (Mass Air Flow / Mass Air Sensor) sensor, instead of a AFM (Air Flow Meter), if that's the case, then yes, the MAF is capable of much higher degree of accuracy than a MAP, up to a point. But the one thing a MAF doesn't measure is boost pressure. In this situation, with the BMW (Barn Door/Vane AFM) in front of the turbo, it has no way of measuring the increase in charge pressure, so it will go only as far as wide open throttle. The turbo will nail the AFM flap wide open as soon as it builds anything over atmospheric pressure. In a situation where a turbo is involved, it's probably very easy to start an ECU tune using a MAF, and then use a MAP sensor to alter the tune to compensate for boost pressure.
My 525i Turbo has a MAF, (BMW Hot Wire MAF), and if the ECU/DME would support it, I would ditch the MAF in a heartbeat in favor of a MAP, simply because at present, once the intake pressure gets above atmospheric, the system just goes into wide open throttle mode, there are no ignition changes, and no fuel map adjustments. I'm relying on the rising rate fuel pressure regulator to "help" with fuel delivery, and it's a close thing at 7psi of boost. I've seen a M30B34 with a turbo, and Haltech ECU running a MAP sensor (3 bar GM MAP Sensor), and there was no throttle position sensor, no MAF/MAS/AFM or anything except the MAP, and I would have a hard time believing that there was anything more simple when it came to making that car run. It had the most rock-solid idle I've ever seen from an M30. The throttle response was much better with the MAP compared to the MAF on my car, and he had no problem adjusting the tune based on boost pressure readings from the MAP, up to about 17psi of boost.
I've considered building a Megasquirt system for my 535i, and tuning it for non-turbo, just to be shed of that barn door AFM in favor of a MAP, so when I do commit to installing the turbo system still sitting in boxes, it'll be a simple process to adjust for boost, and I'll have the sequential injection, and coil pack figured out.
2001 CLK55 AMG - 223K Miles : 1999 Land Rover Discovery Series II - 259K miles - 4th engine : 1996 328i Convertible 89K Miles (The wife's) : 2005 Outback Wagon 203K Miles (also The wife's)
AFM/MAF, you know what I mean.
I was going to explain further ESP with a turbo car, but left it at that.
Any properly tuned car with a decent ECU will use a MAP sensor as a second fuel map behind the main mixture map.
Knowing when vacuum and boost are playing a part really helps, particularly for idle maps and fuel saving areas in the map like when you're cruising.
Just yesterday I finished tuning my RB26 with a plug in ViPec, no MAFs, and with a MAP sensor only, however it was tuned via TPS vs RPM as a multi throttle engine doesn't produce much vacuum anywhere.
That's a whole other story again, can produce some great results though but requires a lot more setting up.
I made 430hp at 17psi, turbos good for another 10psi, but being conservative for now until I'm ready to up the boost
What's the update!!!??
1987 635csi 5spd M106 turbo GT35R
2005 MB E55 AMG
No updates really. Still struggling to figure out why my fuel relay isn't working correctly and also trying to figure out why my windshield wipers aren't working. I'm ordering everything I need for wasted spark tonight though.
'89 535i/5 Holset WH1E turbo
Follow my m106 megasquirt build thread here
Follow my R75/6 build here. Youtube - Dispatch Moto
Awesome. I hope you post details, info and pics of your wasted spark setup. I always wanted to understand it a bit more and how people initiate it on the analog m30
So I went to the yard yet again to find a GM DIS coil base plate. They are pretty easy to find, but there are two types and as far as I know you can make both work, however I went with the single plug style. I'll have to gut the electronics and modify it in reference to the post I linked below. The last one has some good information on wasted spark so I figured I'd post it for anyone unfamiliar with wasted spark.
http://www.diyautoftw.com/showthread...tall-by-Brad-D.
http://www.e30tech.com/forum/showthread.php?t=34200
http://www.e30tech.com/forum/showthread.php?t=48306
Here is an other link showing how to gut the GM DIS module.
http://www.diyautotune.com/diysotm/diysotm_2009-12.html
Last edited by ZenitramNaes; 10-02-2014 at 06:15 AM.
'89 535i/5 Holset WH1E turbo
Follow my m106 megasquirt build thread here
Follow my R75/6 build here. Youtube - Dispatch Moto
Gutted the GM DIS and soldered the connections in in accordance to the links I posted earlier. Also checked continuity before sealing the case back up with RTV.
Will be ordering some MSD coils sometime next month. I'm also considering relocating the overflow tank for the coolant in order to place the coils above the engine. Any ideas on how to accomplish that? I remember reading though a DIY Mishimoto radiator install where he did something similar, I'll have to find that.
'89 535i/5 Holset WH1E turbo
Follow my m106 megasquirt build thread here
Follow my R75/6 build here. Youtube - Dispatch Moto
Fixed my wiper problem, ground on steering colum wasn't making good contact. But when I was running the engine today I could hear a very concerning sound from the bay. I'm hoping it's my alternator or some accessory bearing and not my engine.
Last edited by ZenitramNaes; 10-07-2014 at 01:49 AM.
'89 535i/5 Holset WH1E turbo
Follow my m106 megasquirt build thread here
Follow my R75/6 build here. Youtube - Dispatch Moto
I can't remember who I was talking to about the coolant sensor resistance values, but these seem to be a lot more accurate than the ones I was using from the diyautotune website. With the bias resistor setting still at 2490 ohms
Deg C Resistance (ohms) -15 12002 30 1707 100 187
http://wiki.diyefi.co.uk/index.php?t...ark_Conversion
'89 535i/5 Holset WH1E turbo
Follow my m106 megasquirt build thread here
Follow my R75/6 build here. Youtube - Dispatch Moto
I think it was me- thanks- lll see what these values do.
1987 635csi 5spd M106 turbo GT35R
2005 MB E55 AMG
So I ended up just grounding the fuel relay outside the MS box and it works fine. I'll just keep it like that until someone can offer an explanation to why the conventional way isn't working. Does anyone see a problem with that?
Also, glad to report the noise I was hearing is in fact my water pump. I took off the belt to verify. This is a pretty sure case of failure huh? No way around it I suppose.
Happy to note I picked up some mtech door seals at the junkyard today. It was starting to looking funny without them.
'89 535i/5 Holset WH1E turbo
Follow my m106 megasquirt build thread here
Follow my R75/6 build here. Youtube - Dispatch Moto
Since it's been a month plus just a small update to the car.
Water pump was replaced a couple weeks ago. The power steering return hose decided to start leaking last week, so since then that has been replaced. Also finally got around to installing the UUC ssk I had laying around, much better feel.
Just ordered everything to to get wasted spark running. Enjoying the rather chilly weather with k27.
Last edited by ZenitramNaes; 12-02-2014 at 07:03 AM.
'89 535i/5 Holset WH1E turbo
Follow my m106 megasquirt build thread here
Follow my R75/6 build here. Youtube - Dispatch Moto
I got to the point today where I could have had the wasted spark running on the mega squirt. It's just that I don't have any room to put the coils. I could place them on the passenger wheel arch, but they sit their awkwardly. Ideally I want them over the engine, where the expansion tank is currently.
So I'm asking if anyone has any idea where I could relocate an expansion tank and what plumbing to use. I'm not opposed to getting an aftermarket expansion tank, in fact, that's probably going to be my only option. I don't however want to buy a whole new radiator with a built in tank seeing how I just replaced mine a year and a half ago.
Here are some photos of everything so far.
Got the GM module all wired up so it connected directly to the db15 connector on the MS.
Hard to tell, but added two more ignition drivers, all resistors needed, and all the jumpers to get wasted spark working.
Last edited by ZenitramNaes; 12-09-2014 at 05:24 PM.
'89 535i/5 Holset WH1E turbo
Follow my m106 megasquirt build thread here
Follow my R75/6 build here. Youtube - Dispatch Moto
Here's a shock tower solution but it's probably not practical given that you have a turbo where the plug wires run.
Current: '94 MX-6 V6/5 • '72 240Z • '10 Mazda5
Past: '02 330i/5 • '85 RX-7 GSL-SE • '95 540i/6 • '95 525i/5 • '86 635CSi/5 • '88 JZA70 • '86 4K quattro • '85 RX-7 S
Wish list: Type 44 • Manta • Pre-'85 CGT • 405 Mi16 • SVX • W123 Coupe
That looks great and I love those guides for the spark wires, but yeah it's more of an issue with the mount I have for the coils. Long and rectangular, doesn't sit well on the rounded fender. I'm actually surprised I haven't seen your bay before, love those ITBs too.
Also yes I don't want to cross the wires over the turbo piping and such.
'89 535i/5 Holset WH1E turbo
Follow my m106 megasquirt build thread here
Follow my R75/6 build here. Youtube - Dispatch Moto
One on the biggest obstacles for wasted spark was finding a spot for the coils. Fire wall I thought would be ideal, just like I've seen so many other people have done so relocating the overflow tank was necessary.
I bought the Canton tank from Summit and all the hardware fittings for the coolant hoses I found at my local Home Depot.
It's been running Wasted Spark for about 2 weeks and the idle is great. I don't think I had any spark issues at high boost to notice a difference there, but this will be good when I source a larger turbo. Hopefully I'll get around to uploading a video of it soon enough.
Last edited by ZenitramNaes; 01-02-2015 at 01:34 PM.
'89 535i/5 Holset WH1E turbo
Follow my m106 megasquirt build thread here
Follow my R75/6 build here. Youtube - Dispatch Moto
Hah, Canton, nice.
Go ahead and bite. Plenty for everyone.
Glad you found a solution!
How about an overall shot of the engine bay as it stands?
Current: '94 MX-6 V6/5 • '72 240Z • '10 Mazda5
Past: '02 330i/5 • '85 RX-7 GSL-SE • '95 540i/6 • '95 525i/5 • '86 635CSi/5 • '88 JZA70 • '86 4K quattro • '85 RX-7 S
Wish list: Type 44 • Manta • Pre-'85 CGT • 405 Mi16 • SVX • W123 Coupe
'89 535i/5 Holset WH1E turbo
Follow my m106 megasquirt build thread here
Follow my R75/6 build here. Youtube - Dispatch Moto
'89 535i/5 Holset WH1E turbo
Follow my m106 megasquirt build thread here
Follow my R75/6 build here. Youtube - Dispatch Moto
Experiencing some hesitation around 2k and some noises indicating that something must be wrong with the ignition system. I'm going to start by reducing my plug gap then I'll look into my timing map if problem persist.
Also ordered a 71C thermostat in preparation for Florida Summer temps and for $9 on BMA, I can't see why I wouldn't.
'89 535i/5 Holset WH1E turbo
Follow my m106 megasquirt build thread here
Follow my R75/6 build here. Youtube - Dispatch Moto
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