Half bridge port on stock ecu.

sen2two · 06-02-2010, 05:01 PM

Friend of mine did this a few years back. Ran super hard for a long time. But a simple SAFC would make a HUGE difference.

Its much easier to do bridge ports on stock S4's. If you pop off the casing on the S4 MAF. You can "tune" it enough to be happy. But not to its potential...

N.RotaryTech · 06-02-2010, 06:33 PM

Taking out the s4 engine from the parts car.
This is what came out of the manifold when I took it off.

The engine only had 8 miles put on it from the last time I rebuilt it, and that manifold was clean I thought.

Engine out.

Result of Dremel tool meeting the old, worn pilot bearing.

Parts.

Smoothing the edges, primaries.

Small amount of porting and lots of oil build up.

Secondaries. Before.

N.RotaryTech · 06-02-2010, 06:43 PM

Secondaries after.

The day my daily driver changed, ripped its heart out just for spontaneous curiosity.

The girls meet for the 1st time.

The beast is in.

The s5 manifold didn't fit over this area, so i grind-ed it down. I actually grind-ed a lot more than that.

need RX7 · 06-03-2010, 07:50 PM

Quote:

Originally Posted by N.RotaryTech

Secondaries after.

Cat litter?

06-02-2010, 05:01 PM	#1
sen2two KTEC Join Date: Jan 2009 Posts: 642 Rep Power: 0	Friend of mine did this a few years back. Ran super hard for a long time. But a simple SAFC would make a HUGE difference. Its much easier to do bridge ports on stock S4's. If you pop off the casing on the S4 MAF. You can "tune" it enough to be happy. But not to its potential... __________________ what I have: 1985 Gs:12a All motor Drag car - 1973 Rx2: Play car What I had: 93 Touring: TRADED - 91 Coupe: TRADED - 90 GTU: RHD - 88 10AE: SOLD - 87 Base: SOLD - 86 Base: SOLD - 1985 GSLSE - 85 Gsl: SOLD - 80 Gs: TRADED - 1972 Rx2

06-02-2010, 06:33 PM	#2
N.RotaryTech Home-brew Rotary Join Date: Feb 2008 Location: GooseCreek SC Posts: 552 Rep Power: 18	Pictures! Taking out the s4 engine from the parts car. This is what came out of the manifold when I took it off. The engine only had 8 miles put on it from the last time I rebuilt it, and that manifold was clean I thought. Engine out. Result of Dremel tool meeting the old, worn pilot bearing. Parts. Smoothing the edges, primaries. Small amount of porting and lots of oil build up. Secondaries. Before. __________________ '89 RX7 GTU, half-Bridge-port S4/S5 NA, E6K, Full RB exhaust, weekend warrior. '83 RX7, The "this might take awhile" project. '87 RX7 GXL, Rest In Pieces. '98 Subaru Impreza Outback-sport, rx7 rescue vehicle, down for repair. '94 Ford Ranger, daily.

06-02-2010, 06:43 PM	#3
N.RotaryTech Home-brew Rotary Join Date: Feb 2008 Location: GooseCreek SC Posts: 552 Rep Power: 18	Secondaries after. The day my daily driver changed, ripped its heart out just for spontaneous curiosity. The girls meet for the 1st time. The beast is in. The s5 manifold didn't fit over this area, so i grind-ed it down. I actually grind-ed a lot more than that.