Specializing in the 3g CSM
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PostPosted: Tue May 22, 2018 1:20 am 
CSM Junkie
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Joined: Sun Jan 22, 2006 9:44 pm
Posts: 403
Location: Perth, Western Australia
So, this thing is getting more play time recently than it's had in the last 10 years, and by that I mean it's been driven a few times each month :)

A few minutes from home on one of the recent drives the check engine light flashed up, which surprised me as I forgot I actually wired it up when I swapped ECUs. The error reported by PCLink was AN Volt 5 Short to Ground and AN Volt 5 is the TPS channel. A little look later showed that the TPS mount on the TB has cracked and fallen off... too much thong!


This ticked me off a little as I spent extra on a local Aussie product thinking the reliability would be better in the long run over an eBay jobby but in the end it was an easy fix, I just drilled and tapped the TPS mounting holes into the TB.

The shitty old single synchro KM221 gearbox hates shifting above 6,500rpm in 1st & 2nd and I hoped by lowering the RPM limit in those gears it will add some consistency to the shifts under power. I followed the Link ECU instructions for enabling and testing Gear Detection in the ECU, which is just RPM vs VSS and it's is working well, good enough to use as the main input for a Gear Dependant RPM Limiter.

Other minor changes, ECU now controls the thermo fans and that keeps the idle much more stable when the parasitic load comes on. I also have the ECU setup to run the W2A pump and Thermo's all the time when the Key is in RUN, ECT > 75c and the Engine Stopped, this seems to help the cool down and limit the heat soak on the barrel cooler.

I also did a compression test just to check general engine health, which came out at;

COLD 155, 157, 158, 153
HOT 163, 161, 160, 159

...and that is darn good as they're 165psi new, happy days!

With a recently return to reasonable reliability, I spent a day up in the hills following a bunch of other 80s/90s Mitsubishi's tragic's. The weather was an amazing 26deg, no wind - made the day really enjoyable considering there is no A/C in the car. :rotflol:


There are a few more things on the list of ECU changes, but i'm not really game enough to enable Launch Control & No Lift to Shift my self as there seems to be so many options for me to fruit and banana things up. I'm thinking I will just organise another dyno session over the winter and have a few more PSI added and smooth/lean out the AFR's a tad. Its Logging over 10.5:1 under boost which is a little rich and means I'm hitting 80% duty on the 800cc injectors.

Speaking of boost... I do wonder what the HP limit of the stock short block is? the turbo is supposed to be good for 600HP at the crank at around 27psi and I’m making 300HP ATW on 18psi right now and the turbo is rumoured to really start ramping in efficiency after 22psi.

This could be fun.

PostPosted: Thu May 24, 2018 11:42 am 

Joined: Sat May 14, 2005 11:15 pm
Posts: 7510
Location: Stantonsburg, NC
Thanks for the update and looks like you got to cruise with some nice rides.

95 Eagle Summit DL coupe
15 Mitsubishi Mirage ES hatch

PostPosted: Sun Jun 03, 2018 11:23 am 
The Silent Administrator
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Joined: Wed Dec 24, 2003 3:32 pm
Posts: 9378
Location: Ottawa, ON, Canada
What a strange thing to happen to that TB! Never would have thought I would see something like that, but more like a bent shaft or something. See something new while you regale us with tales of the old (car). Yussss!

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