EFI Custom Intake Winter Project

["jwit6dmc12" <jwit6@xxxx>]

Hello all,
I wanted to share with you what I've managed to accomplish over the 
winter. When my clutch slave cylinder failed I removed the intake 
manifold to replace it, and before I knew it I decided to fabricate a 
new intake for use with my EFI setup. I also replaced the alternator, 
rewired the engine compartment and replaced the exhaust system with a 
polished stainless steel Supertrap.

There's a picture on the second page of the photos section called EFI 
Intake. 

After I had the original intake off I realized that with a 90 degree 
v 6, everything is perfectly square. No fancy angles. And with the o-
ring seals on the heads it seemed like a reasonable project to 
undertake. Anyway if it failed I could just go back to the stock 
intake. But it's such an ugly thing that I really didn't want to give 
up. 

Anyway, the intake is all aluminum, mostly flat 1/4 inch shaped in a 
90 degree V with 6 independent aluminum intake runners whose inside 
diameters match the intake ports. 

All the CIS wiring, sensors and switches are gone, and it really 
cleaned up the engine compartment. While I was at it I also moved my 
previously installed EFI ECU trigger from the coil to a Hall effect 
sensor on the crank pully. Also installed a new Accell Super Stock 
ignition coil.

The intake uses twin throttle bodies from 1990 Ford Tempos. Both 
courtesy of the bone yard. Very economical. Idle air valve is 
courtesy of a Porsche 914. Injectors are Accell 24 lb high impedence. 
Fuel rails are extruded aluminum. All custom. This would not be 
possible if I didn't have my own metal working lathe. Although 
extruded rails are available from Accell and all you have to do is 
have you local machine shop machine the injector seats for you (4 1/4 
inch centers....)

Air filter assy is a K&N in an Edlebrock dual quad oval with custom 
machined fillers to fit the smaller Ford throttle bodies. TPS is a 3 
wire Ford and is a direct bolt on. Engine temp and air temp are from 
Simple Digital Systems (along with the ECU) and the MAP sensor is 
standard GM 1 bar. (Although you could use the stock Bosch water temp 
if you wanted)

With the new intake and the Supertrap I had to bump up the mixture 
values from what I used with the stock intake and exhaust about 10%, 
so I suspect the engine is breathing a little better. It sounds quite 
a bit different. Noticable intake roar under full throttle 
acceleration. Still using the stock cat. 

Fuel delivery to the filter and then to the fuel rails is all stock 
except that I removed the fuel accumulator since it was dirty anyway. 
Fuel pressure regulator is a stock Nissan 240 ZX and runs at 43 
pounds.

Hope to have it on a Dyno soon to finalize the mixtures and see what 
kind of power it makes. 

Hope you enjoy the info....

Jim 
Vin 6147