Elfords big brother

[rip7]

very interesting. got me on the end of my seat.wish mine had a big brother,not a small sister [skoda pickup]

[Th0m4s]

I was a bit bored today so I got out my X-Box and tried to build a RX7 with what I think what could have been the original color sheme of my car judging by the old paint.



What do you think? Should I paint the car that way?

[ian65]

gets my vote

[KiwiDave]

It's a yes from me

[impressiveg]

That would look awesome do it

[rip7]

go for it

[Th0m4s]

Since my RX7 will finally have its new paint in about 3 weeks (thanks to my amazingly fast coachbuilder who needed 11 months to fix the rusty underside of my doors ) I'm thinking about what I will need to do to get it running again. I've had small problems with the fuel pump and the fuel pressure regulator (the pump blew the regulator up) so the car will get a new and more reliable Mitsuba fuel pump. I will also renew the battery wiring to the kill switch including the switch itself. That's why i went to the paintshop today to get some measurements for the new wiring.

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. My turbo is able to deliver much more pressure than it does now so I would be able to go up to round about 300hp at the flywheel with the modification without any problems I think.
The only thing I'm worried about is the distributor. It still is the original early 12a distributor with vacuum advance hooked up and working mechanical advance (at least I think so). I'm not a big fan of driving turbocharged cars with NA timing even if it worked till today, mostly because of the water methanol injection I guess. I've read about some people locking up the distributor and using a static 10° BTDC and 10-15° split but that sounds a bit like a ghetto fix to me What do you think?

[spirit r]

Turbo/Supercharged Applications
When turbocharging or supercharging a 2-rotor engine
capable of 300+ horsepower, racing beat recommend both Leading
and Trailing timing be set at 10 to 12 degrees total advance,
at 6000 rpm, regardless of the porting configuration

[TOOL]

The factory turbo dizzy has a retard function.

Limiting the timing makes complete sense. Try removing the vacuum advance.
You don't run it with a Weber carb without any issues.

Locked dizzy is unnecessary imho.

[Th0m4s]

I'm running my engine with a Carter AFB carb...

As far as I understand vacuum advance only works for part throttle. The timing is advanced at high vacuum conditions so I guess it wouldn't make a big , if any, difference if I disconnect the vacuum advance pods.

I guess it's unlikely to find a turbo distributor and I'm not sure if it would work for me because of the totally different setup.

Is thate any diagram out there where I could see the stock timing and how much it advances with more rpm? I guess that would help a lot. I think I read something about 20° BTDC at 4000rpm maximum somewhere for a 12a but I'm not entirely sure about that and I still need to know where it sits at idle.

I guess 10-12° total advance would not be the worst idea...