Quote:
Originally Posted by al lkosmal
I look forward to it...
regards,
al
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Here's the setup.
'82 911SC with the original 3L and 915.
I started with Al's basic fuel only RHD ITB kit.
Then, because I can't leave a good thing alone, I added/replaced:
1. EMU Black ecu for the MS2
2. Bosch COPS
3. Adapt Motorsport CAM/Crank sensor module for the dizzy
4. Rothsport crank trigger wheel.
5. I also changed up some smaller items like the vacuum plenum and IAC
That all blew the budget up, but I was going to do the conversion myself anyway and my sights were on a fixed target now:
1. A setup which I can easily manage, maintain, tune and upgrade later
2. Get rid of CIS and CDI with full control sequential spark and injection
3. Improve performance, response and efficiency
I did limit performance expectations considering I do not plan to rebuild this engine for another 30-50K mikes. That'll be fun when the time comes. I hear higher displacement, higher compression, twin-spark, ported heads and a custom cam should all be considered whenever I get there.
I had already put on SSIs and a Monty stainless 2in1out exhaust to take care of the exhaust side.
I logged a couple thousand miles with Mango this summer, road tuning and logging. It was running well from a seat of the pants perspective and from what I could see in the logs. I finally found a local shop with dyno that was recommended from a member of our local Air Cooled Luftheads group. It turned out the owner is also a member of the same group, I just didn't know.
We set up to do a few conservative runs/pulls with a 6200 rev limiter.
On the first pull it was clear there we needed to add fuel at high load/high rpm.
We also needed to tune the decel fuel correction to get rid of some pops and bangs and the injector parameters which I had managed to mess up.
Over 4 runs we fixed these issues. The graph represents 1st run and the 4th run which was after the fuel tuning.
After one dyno session, this setup is 23% up on whp and wtq from the original factory numbers.
187whp 5860rpm
182wtq 4540rpm
I'm really happy with the result. The tuner said he's impressed with the result and I would be near impossible to get more without new cams, heads, pistons and cylinders.
I wanted to see a flat torque curve with a good amount down low and almost got it except for that dip between 3-4k rpm. So fixing that is the work left to do. After that, this project is done. While there is a lot more potential in this motor with cams, heads, and p&c s , I don’t need to go there…yet. This motor now is well suited to this chassis and this driving season has been the best so far.
There are two other winter projects planned for Mango - that’s more than enough.
