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Old 10-02-2017, 03:24 PM   #199
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Broke4speed's Avatar
Join Date: Oct 2009
Location: Marionville, Ontario, Canada

Originally Posted by DET17 View Post
The DIYAutotune boxes are reliable, so I doubt that is your issue. I'd always suspect the custom wiring harness first.... but what you describe almost sounds like you've got no fuel. What is the age of your fuel pumps.... one thing MS data logs won't show, unless the AFRs went super lean as she dies.
Since it was a carbed car, there was no in-tank or under-car pumps, just a mechanical one on the engine. I swapped in an EFI level sender and put an Airtex 255lph pump in it.

IMO these cars should be focused to "time to torque"..... a turbo that will spool quick is what you want for a street driven car. NOW if you are trying to build a strip machine out of your 84 then the turbo required is quite different. With something as small as a B21, I think I'd be searching for a 0.48 A/R turbine to get that sucker spooled up quick. I'm in process of a 19t for my DD, and the reason is that they are rumored to spool quite fast...... and keep the boost under 16 PSI so the gas temps exiting the engine stay under 900*C maximum.
This was the first time I've been to the track in three years, so I'm definitely just holding on to old habits by using a big turbo with a .63 exhaust AR. I have no reason to go that big, so I definitely think the 16T is going back on, or it's going to get modded into a 19T over the winter. Coupled with the electronic boost controller I have now, the response should be INSANE.

Since you put in the AW71, did you use the factory CPS? I know folks like to use the earlier distributors with MS, but Kenny (Linuxman) recommended to me years ago to "go to wasted spark" as soon as possible. I'm sure MS2 can handle that, not sure if MS1 is able? The best ignition timing is crank based, not aux. shaft / cam shaft based IMO. I am using the BOSCH Motorsports coil and Buckhaspark WS, and really like it. I'd try to find a way to migrate to that as soon as possible, and get away from a single coil for all 4 cylinders. Alternately, and EDIS system is supposed to be rock solid... also crank based.

Good luck! I'll keep an eye up North to see how you are doing
I used the BW55 flexplate for the swap, which is what my car was originally, so there were no teeth for the CPS. I'd have had to drill the block as well, so I didn't bother. I may look into picking up a B230FT/AW71 from a buddy this weekend, which would give me a spare engine, and a proper flywheel to use for waste spark. It all depends on how motivated I am, because it would be a heck of a job to pull it out (the car is buried in a field). MS1 'could' do waste spark, but I have an MS2 to wire in over the winter, which would remove my current custom harness as well. The MS2 could definitely handle the stock CPS/trigger wheel combo .
1984 244/ AQ140A / M46
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