FD GT40 Build

speedjunkie · Postby **speedjunkie** » Sun May 16, 2010 9:14

^If you're running E85, I'm pretty sure you'll have to upgrade immediately. From what I've seen before from the guys that are running E85 rotaries, they use sizes around 3000cc for ALL their injectors haha, or they'll run like 8 1600cc injectors.

chickenwafer · Postby **chickenwafer** » Sun May 16, 2010 9:14

Yeah, you will need a metric shit ton of more fuel man. I'm not trying to be a downer...I just don't want you to blow you motor.

I'd upgrade to at least swapping your stock secondaries to the primary rail (you have to mod the rail to do this), that would give you the classic 880/1680cc setup most people run, but that's on pump gas. E85 requires at least 30% more fuel.

I would strongly recommend Injector Dynamics fuel injectors. These things are amazing- further more they are high impedance injectors so you don't need resistors or anythings. Truly plug-in-play.

Also, due to their driver system, you can run 1,000cc primaries and not run into low rpm/idle fueling issues. They can run extremely low and high duty cycles without problems.

The bad news is, they are pricey, but they are truly a 21st Century fuel injector.

Also, with E85, you need more fuel flow, so you need a lot of fuel pump. For 5-600rwhp you would need twin Bosch 044 pumps. A Walbro will only be able to handle around 350-rwhp at best. Denso Supra pump could get you around 400rwhp but that would be real close and on the edge.

You could run a Denso in-tank with an in-line external Bosch 044 and that should get you closer to 500rwhp with E85 in a rotary. Remember, rotaries require a lot more fuel than typical piston motors, as well.

chickenwafer · Postby **chickenwafer** » Sun May 16, 2010 9:14

Oh yeah, I also just noticed in the picture you posted of the completed engine bay you have the water pump belt on the wrong side of the pulley. You will be spinning the water pump the wrong way, so you will overheat VERY quickly. You want to get that switched over ASAP before you start the engine.

turboholic · Postby **turboholic** » Mon May 17, 2010 9:14

Thanks Chickenwafer. I couldnt find the right sized belt so I went outside till I could source the belt. Just ordered the right one from carquest.

Does anyone know what the base timing on an fd is stock?

Postby **RX-7 Chris** » Mon May 17, 2010 9:14

Here is a great site for you: http://foxed.ca/foxed/index.php?page=rx7manual

chickenwafer · Postby **chickenwafer** » Mon May 17, 2010 9:14

Idle is -5 leading, +10 trailing IIRC and timing progressively ramps up with load and RPM until redline. Stock split it around 15*

Here is the base map from the PFC for the FD:

Working on getting the trailing

chickenwafer · Postby **chickenwafer** » Mon May 17, 2010 9:14

Well, for trailing, you can just run a straight split of 15*, so you can generate your own trailing map based off that leading map.

turboholic · Postby **turboholic** » Mon May 17, 2010 9:14

thanks.

Im trying to get the aem to sync with my crank. The FD only has 1 timing mark at 20* ATDC which is useless because I cant keep the car running at that degree.

I just found a way to mark 10* BTDC on the pulley so I should be able to sync it now.

chickenwafer · Postby **chickenwafer** » Mon May 17, 2010 9:14

The AEM should also have a base map for the FD.

The OEM timing map might be too aggressive for your GT40 if you're running more than 10psi LOL. I would pull at least 5-7* out of the base map just to be safe.

turboholic · Postby **turboholic** » Mon May 24, 2010 9:14

Finally getting the AEM dialed in. Wastegate is opening around 12-13 psi and it's open atmosphere dump. It's a little loud, im contemplating having it routed back into the exhuast.

There is no feeling like T4 turbo boost on an rx7.

Gotta work on all the drivability tuning now.

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