Elfords big brother

[spirit r]

Schau mal Hier!

http://www.racingbeat.com/mazda/perform ... stems.html
http://www.racingbeat.com/manuals/timingchart.pdf

[Th0m4s]

Habs gelesen, danke.

Over the last week I tried to learn how and when the distributor advances the timing and I think I finally got it. What I'm going to do now is to open up the distributor and weld a small part of the shaft slots of the weights for the mechanical advance shut. This will stop the distributor from advancing the whole 23°. Instead it will only advance about 12° after I'm done.
I will keep the vacuum advance because it really only is working at part throttle so it won't interfere with boost.
I'll set the ignition to 12° btdc leading and 0° trailing at 4000rpm without vacuum advance. I've read a lot about split timing and I think it makes more sense to run round about 12° split in my case. It will cost some hp but it will greatly reduce the risk of detonations. Better 290hp and no detonations than 300hp and broken seals I guess. I will make some pictures of my distributor modification just in case anyone is interested but first I need to finally get my car back.

[Lucky]

While I was there I remembered the car once had an additional fuel injector in front of the turbo which caused some trouble in the past because, when it started injecting fuel through a small nozzle with carburetor fuel pump pressure at 5500rpm and more than 7psi, my car would bog down and shoot the biggest flames I've ever seen out of the exhaust. It seems like todays fuels are much better than the fuels 35 years ago when the system was installed so I don't need that thing anymore.
The funny thing about the "injector" is that the nozzle has exactly the same size as the one my water methanol injection uses and sits in nearly the same position and that's what gave me the idea to extend my water methanol injection system a bit. I'd like to build a second stage maybe even controlled by the fancy electronics box previously controlling my fuel injector.

Would this injector nozzle have been installed to cool the intake charge down a bit before, the water injection was put on? I've seen a home-made turbo setup that used fuel injectors to do exactly this. Possible that the fuel pressure now is just massively too high for what it was intended for?

[Th0m4s]

It was built with the water injection and both nozzles were there right from the beginning. The fuel pressure is the same as it always was. If it was any higher the carburetor would get flooded anyways.

BUUUUT I've read the turbo conversion manual from 1982 again and it seems like the water methanol injection system was never intended to have 30% methanol in the tank but only pure water (which is a waste in terms of knock protection and it could freeze in low temperatures).

I'm driving with 30% methanol in the water which i guess makes the engine run much richer and therefore I don't need the additional fuel injector anymore.