The 15 Y/O Turbo M42 Build Thread (Now Holley EFI Terminator X Controlled)

[wazzu70]

Is your charging system working correctly? How many volts to the battery when running?

[Dj Buttchug]

here is my startup enrichment table. It used to be much linear but I raised the enrichment around my startup temp to finally get it started.


Here are my symptoms.
1. shitty idle (hunts constantly)
2. Still will not start up cold (70-80 degrees)
3 Starts when hot but excessive cranking is needed.
4. When I jump the car battery it seems to start much easier, hot or cold. The battery in the car is brand new.

megasquirt gurus help me out

[Dj Buttchug]

for some reason my tuning PC will not upload my files correctly so here are screen shots of what I am working with

The numbers are red because I just changed them back. I was tweaking things a little


My cold start issue still persists. Ill post my startup enrichment as soon as the photo uploads.

[wazzu70]

Those dwell numbers sound much better!

I have the TDC tooth the 20th tooth after the gap. Thats the best way to explain it since all trigger settings for different system need different info.

The cam sensor is before TDC, so you shouldn't need to make any changes to that as most system place #1 cyl after the secondary trigger tooth. The early M42 has a VR sensor second trigger, at lower RPMs it does not generate a signal...on my setup at least. I want to change to a hall secondary for that reason :)

[e30guydownunder]

why not just do some screen shots?

[Dj Buttchug]

adjusted my dwell from 4ms down to 2.8 on startup. much better now. Also added some nice heat syncs under my new drivers.

Im trying to upload a few msq files of my tune so you guys can my numbers but im having issues attaching it to a post. who knows how?

[Dj Buttchug]

I think positioning the cam sensor different but rotating the cam wheel would help also.

BCPR7ES - had them left over from SR20 days but seem to work nicely

interesting. When does it miss? in my experience missing under load COULD be related to spark gap. I had issues choosing plugs and I ended up going with s2000 plugs.

[e30guydownunder]

I think positioning the cam sensor different but rotating the cam wheel would help also.

BCPR7ES - had them left over from SR20 days but seem to work nicely

[Dj Buttchug]

same here. There is a way to remedy it. You can run a gm style trigger wheel and sensor DIY autotune.

What spark plugs are you using?

[e30guydownunder]

my trigger signals are good, but just the relationship between them and tdc, have to do a few revolutions for it all the sync up nicely. Not sure what is causing my misfire though :(

[Dj Buttchug]

cold starts are fine. it cranks for a while because we haven't got the triggering perfect, but once it catches, settles to an idle straight away. I'm also running E85 which makes cold starting MORE troublesome

Im tweaking my dwell settings tomorrow. It appears I also have a triggering issue. My crank sensor drops signal sometimes and then I end up cranking for a really long time.

Its a brand new OEM sensor too. wtf. I can see it on my studio drop signal.

[e30guydownunder]

cold starts are fine. it cranks for a while because we haven't got the triggering perfect, but once it catches, settles to an idle straight away. I'm also running E85 which makes cold starting MORE troublesome

[Dj Buttchug]

I'm running my M50 coils at 3ms.....I have also developed a strange miss :( off to the dyno on Tuesday for diagnosis.

how are your cold starts at this setting ?

[e30guydownunder]

I'm running my M50 coils at 3ms.....I have also developed a strange miss :( off to the dyno on Tuesday for diagnosis.

[Dj Buttchug]

got my new bip373s in the mail and installed them. Fired right up. life is good.