Lighter = Faster (N/A build thread #2)

infernosg · 09-15-2017, 09:18 PM

New kid takes time away from working on the car. I managed to get a couple things done this week while off of work:

-Changed oil and filter. Went with 10W40 weight this time and I'm still seeing 40+ psi of oil pressure at idle.
-Moved my vacuum manifold to the top of the intake manifold. The previous location allowed residual premix to pool in the vacuum manifold.
-Added a 1 bar MAP sensor to give me the option to tune with speed-density.
-Added 6 more oz of premix to bring the ration closer to 1.5 oz to 1 gal fuel during break-in.

The last one really messed with my tune, I think. What worked before was now running very lean so I had to add a bunch of fuel back. I've got it running again but I haven't got it out on the road yet. Hopefully I'll get a chance this weekend.

I've also ordered a FFE primary fuel rail and two ID725 injectors. I think relying on two ID1000 injectors in what are essentially secondary injector positions is going to prevent the car from running smoothly. Hopefully running smaller injectors in the stock primary location will smooth out idle and part throttle conditions. Vacuum sits around -6 psi at idle but peaks around -10 psi revving the engine in neutral below 3000 RPM. Hopefully this is enough to use speed-density tuning.

Lastly, and not sure if this'll work, but here are the latest pictures:

09-15-2017, 09:18 PM	#11
infernosg IT'S ALIVE! Join Date: Dec 2009 Location: Richmond, VA Posts: 811 Rep Power: 16	New kid takes time away from working on the car. I managed to get a couple things done this week while off of work: -Changed oil and filter. Went with 10W40 weight this time and I'm still seeing 40+ psi of oil pressure at idle. -Moved my vacuum manifold to the top of the intake manifold. The previous location allowed residual premix to pool in the vacuum manifold. -Added a 1 bar MAP sensor to give me the option to tune with speed-density. -Added 6 more oz of premix to bring the ration closer to 1.5 oz to 1 gal fuel during break-in. The last one really messed with my tune, I think. What worked before was now running very lean so I had to add a bunch of fuel back. I've got it running again but I haven't got it out on the road yet. Hopefully I'll get a chance this weekend. I've also ordered a FFE primary fuel rail and two ID725 injectors. I think relying on two ID1000 injectors in what are essentially secondary injector positions is going to prevent the car from running smoothly. Hopefully running smaller injectors in the stock primary location will smooth out idle and part throttle conditions. Vacuum sits around -6 psi at idle but peaks around -10 psi revving the engine in neutral below 3000 RPM. Hopefully this is enough to use speed-density tuning. Lastly, and not sure if this'll work, but here are the latest pictures: __________________ '86 Mazda RX-7 Base '79 Mazda RX-7 GS Last edited by infernosg; 09-18-2017 at 10:33 AM.