MyE28.com

Here's his post on the maps for the car.

Linky

Edit: It should be noted that there is a lot of debate in that thread about maps.

But, it's a good start and I think he's the most recent to add an MS to a B35 so would be a good source for info about the wiring harness and signals.

Yup,
90% sure cereal killas car is a manual. His moniker is 535im. Thay usally means manual. I PM'd him to make sure.

RussC

coming back to this beauty later to see how the BMW ICV turned out.

just finished assembling and testing the MSv3. Time to build the harness and get it running.

just to mention it again, im letting my stock Bmw DME control the idle valve, and My idle is pretty damn solid.

90e34535i wrote:just to mention it again, im letting my stock Bmw DME control the idle valve, and My idle is pretty damn solid.

We hear you. I just find it really dis-tasteful to have to keep the BMW ECU for JUST idle control
Or in my future case, auto tranny control.

RussC

It was easier for me to just leave it working how it was before, and only cut off 3 connections from the Bmw ecu(2 injector lines, and the negative wire to coil), and then just Tap/share the Vr sensor and coolant sensor.

90e34535i wrote:It was easier for me to just leave it working how it was before, and only cut off 3 connections from the Bmw ecu(2 injector lines, and the negative wire to coil), and then just Tap/share the Vr sensor and coolant sensor.

So what a minute, but you had to add the MAP and IAT?

I guess the last question is is the AFM still in the system? The ECU needs that for idle control I believe? Your car is a manual tranny, right?

Actually a detailed write up of your total system would be great. It sounds like you've done somthing here that pretty slick!

RussC

I removed the AFM. Map is built on the MS board.

And amazingly, im still not running any IAT sensor, luckily the temp here doesnt vary much, and its not hard at all for me to keep the afr steady.

Car idles fine with no AFM, Id like to know if it will idle with no TPS sensor either(that will only work if its only going off rpm), im going to try to unplug it sometime. That way I can just switch my TPS module to the Auto version with Variable Voltage output.

But It really doesnt seem I need any Acceleration enrich anyway, But the Decel fuel cut would be nice.

Yes, its a manual tranny.

90e34535i wrote:I removed the AFM. Map is built on the MS board.

And amazingly, im still not running any IAT sensor, luckily the temp here doesnt vary much, and its not hard at all for me to keep the afr steady.

Car idles fine with no AFM, Id like to know if it will idle with no TPS sensor either(that will only work if its only going off rpm), im going to try to unplug it sometime. That way I can just switch my TPS module to the Auto version with Variable Voltage output.

But It really doesnt seem I need any Acceleration enrich anyway, But the Decel fuel cut would be nice.

Yes, its a manual tranny.

OK, thats good to know. I had no idea the car would idle w/o the AFM input
I guess the ECU is putting out error codes, but you don't care, as the MS is runing the system. Im also guessing the idle is ~1k rpm, as the ECU is probably runing in limp mode due to not having a AFM input? Thats what my M1.3 179 ECU did. Anytime there was and error code thrown, the idle would instantly go from 850rpm to 1k rpm.

Although Im not sure this is a big issue, as PeterF seems to have the idle circuit runing, at least that what I infer from his comments.

RussC

it seems to try to keep it at around 750-800rpm. Yes its got a check engine light, but i can disable the light if i ever needed to, or use it for something else(jus cut line on harness near bmw dme).

russc wrote: Although Im not sure this is a big issue, as PeterF seems to have the idle circuit runing, at least that what I infer from his comments.

Just curious as to where you have been reading about that?

cafcwest wrote:

russc wrote: Although Im not sure this is a big issue, as PeterF seems to have the idle circuit runing, at least that what I infer from his comments.

Just curious as to where you have been reading about that?

Probably in an email from me.

FirstFives Dictator wrote:

cafcwest wrote:

russc wrote: Although Im not sure this is a big issue, as PeterF seems to have the idle circuit runing, at least that what I infer from his comments.

Just curious as to where you have been reading about that?

Probably in an email from me.

Sounds like I need to get in on that cc list


Please.

FirstFives Dictator wrote:

RDAvena wrote:from reading info on the MS forum I thought others had made the BMW ICV valve work. Guess I will have to read up on it again.

The only non-BMW sensor that I will be using is the one for intake air temp.

We're using our hardware design that works well for 3 wire. A variation of the FET circuit that's floating around. No giant 50w resistor.

Having said that, tuning hasn't been done for closed-loop yet.

Right now we have warmup settings for it that work well (Todd is using them).

PeterF mentioned it right here in this thread that the idle circuit is working, or more correctly is "mostly working". I fully expect to get this runing in my install.

I recieved the MS box today. Looks good. Ill be starting my install next week after I go look at an E34 in Altadena.

RussC

Kinda OT, but what kind of injector control does MS have? I read somewhere that you have two options, batch-fire(all injectors at once), or bank-fire(half the injectors at a time). I was looking at Tec-3 for that reason, but if you can tell me otherwise, or tell me why sequential isn't any better, then I'll be buying a SEM MS setup.

landspeed wrote:Kinda OT, but what kind of injector control does MS have? I read somewhere that you have two options, batch-fire(all injectors at once), or bank-fire(half the injectors at a time). I was looking at Tec-3 for that reason, but if you can tell me otherwise, or tell me why sequential isn't any better, then I'll be buying a SEM MS setup.

MS is bank fire or batch fire, but I recommend using it in batch mode (M30 seems to run better on 'batch' as opposed to alternating bank; I think a 4 or 8 cylinder motor would work ok 'alternating')

Note Motronic 1.0 is batch like Ljet.

Ive always used Alternating Injecting half the injectors at a time.

At the time, when I first switched to MS for Fuel only, I thought I noticed it ideling smoother and feeling smoother with the MS installed(at same A/F ratios).

So, no extra benefit from sequential fuel control then? I guess it's MS for me as well.

Right now I have the idle valve board working based on bench testing. According to the multimeter it's doing everything it should, I still want to hook a valve up to verify it works. I'm using the Glens Garage board on my v2.2 ecu. I've purchased a 2nd megasquirt case to mount all the extra boards that can be seen in that photo, from left to right I have the wheel decoder circuit, the idle driver board, and the waste spark coil drivers.

I'm going to try the internal hardware change on my friends v3.0 board and see if that works or not.

landspeed wrote:So, no extra benefit from sequential fuel control then? I guess it's MS for me as well.

Um, I had a document that laid out the advantage of seq. over batch. Its was very little, ~5% up to ~4k rpm. Then there was not advantage as even in sequential fueling, the gas would puddle up on the valve. Its on a backup drive that I don't have access to right now, so Ill try to post it later.

RussC

When you are running the upper range of injector duty cycles, basically whenever you are WOT, batch vs. sequential really makes very little difference if any since the injectors are spraying way longer than the valves are open anyway. It may even out things a little bit at part throttle but it is hardly a requirement. Proper setup and dialed in tuning makes a much bigger difference.