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N.RotaryTech · 06-12-2010, 11:29 PM

Just to give my experience,
I have recently half bridge ported my s4 n/a on stock ecu with 550 primary's and resistors inline with the secondary injectors circuit.

My thread: http://www.rotarycarclub.com/rotary_...ad.php?t=11402

How it drives:
It has starting issues, cruising issues, ie hesitations, bucking.
For it to drive good, I have to basically have the throttle on an off. Non of the half throttle stuff when cruising on a normal engine.
It pulls its best after 5k rpms.
I can chirp the tires on start off, and going into 2nd.
Gas mileage is around mid teens.
It is louder than my previous engine with the same RB presilencer an mufflers.

And... (thinking of anything else to add)
I would do it again.

btw: This engine pulls better than the previous s5 na.
The only thing that's different from the s5 setup is the block an the primary injectors, an resistors.

06-12-2010, 11:29 PM	#5
N.RotaryTech Home-brew Rotary Join Date: Feb 2008 Location: GooseCreek SC Posts: 552 Rep Power: 18	Just to give my experience, I have recently half bridge ported my s4 n/a on stock ecu with 550 primary's and resistors inline with the secondary injectors circuit. My thread: http://www.rotarycarclub.com/rotary_...ad.php?t=11402 How it drives: It has starting issues, cruising issues, ie hesitations, bucking. For it to drive good, I have to basically have the throttle on an off. Non of the half throttle stuff when cruising on a normal engine. It pulls its best after 5k rpms. I can chirp the tires on start off, and going into 2nd. Gas mileage is around mid teens. It is louder than my previous engine with the same RB presilencer an mufflers. And... (thinking of anything else to add) I would do it again. btw: This engine pulls better than the previous s5 na. The only thing that's different from the s5 setup is the block an the primary injectors, an resistors. __________________ '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. Last edited by N.RotaryTech; 06-12-2010 at 11:34 PM.