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I thought the same that the numbers seemed on the low side. However, what is the typical loss of hp and torque from the engine to the rear wheels? As an example, if your engine puts out (or you think it puts out) 140hp but at the rear wheels it comes up with 97hp, would that be a typical loss?AR4me said:... My general feeling was that many recorded less than expected...
Can't get A/F on the Motronic twinspark because there's no O2 Sensor. It seems there wasn't much unleaded fuel in Europe in the mid to late 80's when the 75 TS was in production. Hence, Motronic wo/O2 sensor feedback to control A/F. I assume it's a nonaddaptive 4.x Motronic system. Interesting isn't it? I wonder if the ECU is coded to take O2 sensor input but that it's just not used on the European engines of that time frame. Any thoughts?75evo said:Did you all get the corresponding A/F values graphed against bhp & rpm? That would be extremely useful.
I Have never even heard about a 75 TS without a O2 sensor. And I've seen quite a few...Bruce Colby said:Can't get A/F on the Motronic twinspark because there's no O2 Sensor. It seems there wasn't much unleaded fuel in Europe in the mid to late 80's when the 75 TS was in production. Hence, Motronic wo/O2 sensor feedback to control A/F. I assume it's a nonaddaptive 4.x Motronic system. Interesting isn't it? I wonder if the ECU is coded to take O2 sensor input but that it's just not used on the European engines of that time frame. Any thoughts?
If you mean "Did the dyno have a wideband O2 sensor?", I don't really know. But if it had one, they didn't use it. This wasn't a serious tuning session, it was just a "put your car on the rollers and see what it'll do" type thing. There were about 14 cars processed in 3.5 hrs (about 15 min/car) so it had to be pretty straight forward. I think the Motronic TS results were fairly consistent with the original factory specs so I believe it's running the way they intended. That makes me happy.75evo said:At WOT, the Motronic will ignore the O2 sensor and will run on a given map in the ECU. But what's important is the A/F given by the wideband O2 sensor.
Did they use a wideband O2 sensor during dyno?
Its useful because then you can figure out where your car is running lean and where it is running rich. Then you can start tweaking the ECU a little.
For max power, I was told, 12.7:1 A/F is good. Actually using a Lambda value is better.
Mats,BigSwede said:Different markets... Thats why they have that jumper.![]()