Half bridge port on stock ecu.

N.RotaryTech · \r\n \r\n \r\n 06-03-2010, 08:32 PM\r\n \r\n \r\n

So a little history on my '89 rx7 gtu, s5 na

When I got it, it had 145k miles on it, got a rebuild, Ive daily driven it since Nov. 2005, it now has 199k miles.

Ive done a few upgrades to it the past few years,
racing beat mufflers an pre-silencer,
emissions removed including aux actuators and sleeves removed, and vdi wired open,
intake filter w/heat-shield,
clutch-masters stage 2 clutch,
And other misc. things like window tint an speakers.

This car has gone through two alt belts, two drive-shafts, two clutches, and a set of tires lol.
Its never left me stranded but gave me a scare when cruising the mountains one weekend when it had sever cut-out problems.

Now for the bridge port:
Why?
I got a screw come loose in my brain at dgrr'10 when I saw ErnieT's FD brap'n away at the lodge.
Ive always wanted to do a bridge port or something of that caliber but never had the mind (or screw loose, in my case) to actually do it.

So I had an s4 na parts car with a engine that I rebuilt with a large street port with only 8 miles on it just sitting.

I took the s4 engine out, took it apart, added the bridge port, cleaned the engine parts up alittle, put it back together, took the perfectly good running s5 engine out of my daily driver, swapped the s4 bridge port engine in.
And I did all this with no expense. Reused everything.

How I got it running:
At first it would start but not stay running.
My brother was helping me the day I got it running. He happened to have a pair of 550 injectors with him. We swapped them in place of the primaries, also had to swap the s5 injector connectors with s4.
We tweaked the throttle body adjusting screws for the idle. Installed a fuel-cut switch. We had a wide-band o2 sensor to check the ratio's, which were rich all across the rpm range.

It ran like shit the first two weekends. Rough start-offs, bad hesitation at cruising, and it would bog down after 7k rpm's. The first two tanks of gas were guzzled at 11.9mpg then 13mpg.
I took it down to my brothers to install two 50ohm resistors in parallel inline with the secondary injectors. That fixed the really rich issue in the upper rpm's. The 3rd tank of gas was about 15mpg.

It still has hesitation at cruising. Ive gotten used to the way you got to drive a bridge port. Most of the time its got to be on an off. lol. It revs faster than before, and goes faster too.

Next comes proof (pictures, etc).
Ill post em up soon. They are also in the link in my signature.

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