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Recently there was a post where we were talking about fuel economy and this topic poped up. I had replaced the original xxx561 ECU in my '89 245 out of necessity and got hold of this one from the P&P bone yard. I thought it was worth a new post. Sven here's your answer.
"Hey what # ECU is that? I recall posts re. using some alternative ECUs, your comments may be helpful to some here.
Thanks!
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Sven: '89 245, IPD sways, electric rad. fan conversion, 28+ mpg - auto tranny. 850 mi/week commute."
The ECU is a Bosch # xxx935.
I have researched it and found nothing about it as far as a Volvo stock ECU for a 940 is concerned. It may have been a replacement for the OEM one. It came out of a Bosch LH 2.4 FI system 940 that had the brown top injectors, same as the ones on my 240. The particular 940 also had a Volvo stock 2-stage elec fan system which has yet to be installed in my 240.
The dead carcas had a rod thrown through the side of the block, and it lodged in the left fenderwall. I didn't think you could do that with a B230F n/a motor, but after putting the ECU into my 240, I find it has low end with much better torque curve. Zoom! Pulls right up to redline, with a solid power band from 4000-6000 rpm.
Before I made the switch, I contacted somebody in Sweden who said that if I could find one, a 940 n/a ECU from a Bosch 2.4 FI car would automatically get me 142 hp without doing anything else. Most US 940's had either the LH 3.0 or the Regina system. Now I believe the guy from SAM in Sweden. With the VX cam, adjustable cam gear, IPD sport exhaust, Carsound cat, and modified K&N intake from a '78 242GT (no air warmer), I think the car is pushing between 155 and 160 hp. No turbo necessary. I have gotten 0-60 mph times of 7.8 sec.
With this ECU in the car for 1 yr now, the brick has enjoyed a new life, and made the owner much happier. The engine still runs great at 278k miles, never more than a tune up and TB replacement.
For those of you who may think it would have problems with emissions inspection (myself included!) here are the numbers taken 8/15/05:
Low speed, 767 rpm HC(ppm) 36 CO(%) 0.01
High Speed. 2562 rpm HC(ppm) 29 CO(%) 0.03
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