Messages

1

For Sale / Lots of parts - COP conversion, Racing Seat, M3 seats, Strut Bars, ecu's

« on: February 03, 2010, 01:57:04 AM »

I decided to make an eBay store to make things easy.
Go to the Others section or use the search function.

http://stores.ebay.com/bigfishmotorsportsstore

2

Engine management / M42 Engine management maps and info

« on: January 14, 2009, 04:44:11 PM »

seriously. Nobody out there is gonna help me out with this?
Do I need to start throwing a hissy fit?

3

Engine management / M42 Engine management maps and info

« on: January 04, 2009, 10:58:56 PM »

anyone?

4

Engine management / M42 Engine management maps and info

« on: December 26, 2008, 02:33:16 AM »

Does anyone have MegaSquirt maps for fuel & ignition?
Actually any software will do. I'm just looking for maps that are MAP (KPa) vs. RPM instead of load% or throttle position.

J.

5

Engine management / Megasquirt and DASC - Need info....

« on: December 13, 2008, 02:33:36 AM »

OK. here's the update on the cam sensors:
M42 = VR
M44 = Hall

The upper timing cover from the M44 and M42 are different and I have to use the M44 cover to match the head.

So, the M44 upper timing cover has the hall sensor mount on the intake cam and utilizes a plate mounted to the cam gear (see image below) to trigger it.

I have removed the M44 cam gears in favor of my nearly new m42 cam gears and I confirmed that the trigger plate will mount to the M42 gear. I do know that I CANNOT mount the M42 VR sensor to the M44 upper timing cover as it sits too far in and the sensor contacts the cam gear. So, changing over to the M44 hall sensor seems to be the only option.

I also know that the intake cam gear on the M44 is slightly different and I don't know if it matters. The one I have isn't in that bad of shape, so I think I might swap them simply to avoid it as a potential problem. There seems to be a slightly different profile to it which might effect how closely the sensor comes to the spinning plate. Not sure if a hall sensor is that sensitive, but I know VR sensors can be.



So this puts me in a place where I can run sequential ignition. Now I just need to read up on how to make it work.

Thoughts anyone?

6

Engine management / Megasquirt and DASC - Need info....

« on: December 13, 2008, 02:30:19 AM »

OK, so here's an update. Got the math wrong on the coil firing, but the concept was the same. As a group, they would fire 14,000 at redline.
Individually, it would be 3,500 as opposed to stock which is 1,750.

However, in talking with Matt at DIY, there are some issues with getting the MS to run sequential ignition. I have never done it before; always ran wasted spark. So, I don't know much about it.

Matt gave me these choices:
1. Use two coil outputs and a wasted spark coil pack - this is a very well proven setup.
2. Modify it for four coil drivers that fire in wasted spark - simple to wire up, but one we haven't tested for ourselves. Most people who have run this setup apparently don't have very much trouble with it, though I have seen occasional reports of setups like this having trouble starting in very cold weather. (Usually these reports come from Scandinavian countries where the winters are pretty brutal.)
3. Modify it for four sequential coil drivers. This would require a cam sync input and consequently would make for significantly more expense, plus the second VR circuit is not easy for us to bench test out.

#2 seemed like the route to go as I have the 4 coil drivers.
#1 isn't an option b/c I don't want to over work the coil drivers at high revs
#3 is preferred, but he makes it sound sketchy

I am new to this one, so if anyone can point me to some info, other posts regarding it, etc. I would be stoked. There isn't as much M42 info out there on MS set ups.

J.

7

Engine management / Megasquirt and DASC - Need info....

« on: December 13, 2008, 02:29:40 AM »

OK, so here's an update. Got the math wrong on the coil firing, but the concept was the same. As a group, they would fire 14,000 at redline.
Individually, it would be 3,500 as opposed to stock which is 1,750.

However, in talking with Matt at DIY, there are some issues with getting the MS to run sequential ignition. I have never done it before; always ran wasted spark. So, I don't know much about it.

Matt gave me these choices:
1. Use two coil outputs and a wasted spark coil pack - this is a very well proven setup.
2. Modify it for four coil drivers that fire in wasted spark - simple to wire up, but one we haven't tested for ourselves. Most people who have run this setup apparently don't have very much trouble with it, though I have seen occasional reports of setups like this having trouble starting in very cold weather. (Usually these reports come from Scandinavian countries where the winters are pretty brutal.)
3. Modify it for four sequential coil drivers. This would require a cam sync input and consequently would make for significantly more expense, plus the second VR circuit is not easy for us to bench test out.

#2 seemed like the route to go as I have the 4 coil drivers.
#1 isn't an option b/c I don't want to over work the coil drivers at high revs
#3 is preferred, but he makes it sound sketchy

I am new to this one, so if anyone can point me to some info, other posts regarding it, etc. I would be stoked. There isn't as much M42 info out there on MS set ups.

J.

8

Engine management / Boosted M42 & Wasted Spark with stock coils...

« on: December 12, 2008, 01:33:11 AM »

I'm pretty sure the stock coils were never intended to run wasted spark, but it seemed the simplest route for setting up my MS on my newly boosted motor. I am concerned that they will produce a week spark at high revs. 14,000 sparks per minute is quite a bit to ask from something that was never intended to spark more than 7,000 times per minute.

Does anyone have any experience with this presenting a problem?
Is there any tell tale signs of weak spark at high revs on boosted motors?

What about M42 coils, vs M44 coils, vs. say.... S52 coils or an after market performance coil like an Accel Ford set up?
I have M42 and M44 coils, so I hoping they will work and I won't have to spend any  more money.

J.

9

Engine management / Megasquirt and DASC - Need info....

« on: December 09, 2008, 01:15:06 PM »

Do you have the m44 engine wirings? You calibrated stock sensors or you bought GM ones?

Yes. I have a full m44 wiring harness and will run it all the way through the firewall and make my splices to the Megasquirt harness there.

One of the VR sensors is the cam and the other will be your crank.  I think the crank is the base, and the cam is the 2nd, but it might not matter.

Yeah, I don't think you need to worry about the second one. It should just run off the crank wheel and not need the second one for anything.

I do not have specific #'s for the trigger wheel but I am sure someone does, or you can count them.

Yeah. I'm sure I can figure it out. Just haven't gotten around to it. Figured the info was out there.

 As for spark, just make a conservative map up to 100kpa, then have them drop off as boost. You will want less advance than a turbo car, because of the lack of intercooling.  Look at what the m50/s50 people are doing for advance, and copy it but more conservative at higher MAP.  you can always add in more advance once it runs.

Yeah, again, I figure there is better info out there than that. Hoping others will chime in.

J.

10

Engine management / Dwell Settings...

« on: December 08, 2008, 07:19:24 PM »

Clueless. Someone gave me the numbers for the M20, so I never even really read about it.

11

Engine management / Wheel Decoder Settings

« on: December 08, 2008, 07:15:12 PM »

Base Teeth: 60
Second Trigger Enable: This is where things get ify for me. The last motor I did was an M20 which does not have a crank sensor. Is this where you would enter it in to the equation?
2nd Trigger Active Edge: ?
2nd Trigger Missing Teeth: ?
Missing Teeth: -2

And thats where I get stuck. Does anyone have this figured out? I will verify it once I have the pulley system back on and TDC set, but I want to know what others have come up with.

12

Engine management / Codebas and Output Functions

« on: December 08, 2008, 06:50:55 PM »

Code Type
Distributor: off
Neon/420A Decoder: off
Wheel Decoder: Generic Wheel
EDIS: off
TFI Ignition: off
HEI Ignition: off

The following is subject to your hardware set up.....
Input/Output pins
Fidle Function: Idle Control
LED17: Spark A
LED18: Spark C
LED19: Spark B
Multiplex Ignition: Normal
X2 JS0: Fan Control
X4 JS2: Output 1
output3/Spark D: Spark D
pin10/ shift/Spark E: Shift Light
knock in / Spark F: Knock input

13

Engine management / Exhaust Gas Settings

« on: December 08, 2008, 06:41:59 PM »

Megatune 2.25 - Specifics:

Using Innovate LC-1
- Sensor Type: Wide Band
- EGO Switch Point: 2.352
- Ignition Events or msec per step: 31
- Controller Step Size: 1%
- Controller Authority: 10
- Active above CLT: 140°F
- Active above: 1,400 RPM
- EGO Corr. Step Counter: mSec

14

Engine management / Engine Constants

« on: December 08, 2008, 06:37:20 PM »

Megatune 2.25 - Specifics:
Engine Constants:
Required Fuel: 7.2
- Displacement: 1900cc
- Cylinders: 4
- Injectors: 42 lb/hr
- AFR: 14.7 (gasoline - in my case 91 octane)

Injector Characteristics:
(Delphi 42# High Impedance)
- Opening Time: 1.2ms
- Battery V Correction: .2
- PwM Current Limit: 100%

- FIdle Threshold: 160°F

- Baro Corr.: off

Injector Control
- Control Algorithm: Speed Density
- Injections per Engine Cylce: 2
- Injector Staging: Alternating
- Cylinders: 4
- Injectors: 4
- MAP Type: 250kPa
- Engine Type: Even Fire

15

Engine management / Its been quite a while.....

« on: December 08, 2008, 06:04:25 PM »

... since I started this post and I hope you guys are still out there as I am finally am getting around to doing this build.
Couple of updates on me and how this thing is going together:
I have now built and set up a few different engine management systems for a few cars including a Megasquirt for an M20 stroker. I did the whole thing from scratch and though it took a while, I did learn a lot. One of things I've learned is that I would pay money for a quality MS timing table to get my tuning going. Fuel tuning is a piece of cake if you know where you want your AFR, but the timing is still a mystery to me.

So if anyone has a boost timing table or more specifically, one running a DASC, I would be stoked. I know that would not be a turnkey thing for me, but a good starting point is key.

All that said, here is the set up I am going to run (I call it an M43
- M44 motor (head, pistons, rods - all stock)
- M42 Crank
- Compression Ratio should be around 9.3:1
- Boost Target = 12psi (stock 5.75" crank wheel & 3.4" pulley)
- M42 front cases, cam sensor, 60-2 crank sensor, throttle body & TPS
- M44 knock sensors
- Megasquirt (fuel & spark) running off of MAP with 42# Hi-Z injectors, full length headers, & 3" exhaust

Where, oh where do I begin with timing. I DO NOT feel comfortable with even trying to start the car off of one of the MS generated maps. No way.

I have started a series of posts below that outline the basics of setting up the file. Most of this is based on what I just did for an M20 motor, but it is all subject to review by others and I haven't (REPEAT - HAVE NOT) run a motor on this file yet, so please don't take any of this as a sure thing just yet.

J.