Nope, I never had a 20B. Just on a 13B.

Still not as good as my stock FD though. Drove that home at 55mph (don't ask why) and damn near got 30mpg.

 

Honestly not sure. These coils are wired up using a c ludwig harness for the last 4 years. The only issue I have ever had with these coils is trying to run very rich on E85 at higher boost levels. With E85 it wasn't an issue. Leaned it out and ignition issues went away and power went way up.

 

share you injector pulse width at a specific MPH. lets get some data on this. lets see who has the lowest Inj P/w and they are getting the best MPG. i thought the way to do it was 13.5 afr and as much timing as possible, but i did some research on negative split for cruise and leaning it out as much as possible a while back, havent done it myself yet, working on tuning power right now

also t-von, you dont have stock ports, they help alot.

 

Chris originally ganged all the grounds together (he was the one who pioneered the use of these coils on a rotary after all), but soon discovered that was not the best way to do it. Ignition breakup at high boost/rpm as everyone else is mentioning. Now power ground goes directly to battery terminals and the others go to rotor housings. Not sure if you have a revised harness or not. It's easy to fix if not.

 

I don't have stock ports?? What makes you say that? I'll just say that I don't have you typical PP setup and I'm still experimenting. My new connectors just showed up to rewire my coils. I stupidly didn't leave enough wire on the original connectors when I wired them the 1st time. As soon as I get everything hooked back up, I'll get those pulse width numbers.

 

Yep joining all 3 gounds is what I did too. Now I'm trying to fix that as the power of my setup never seemed right.

 

Thanks for the info. I definitely have a revised harness. There is a ground at the battery and the rear rotor housing.

 

The turbo is a bw sxe 366, t4 ar 1.0 exhaust housing but its been modified to an open t4 by the turbo shop....not a cheap mod.
It has a v-band outlet and im running a 4-inch downpipe.

 

 

Bud, I'm running this exact turbo (sxe69) on my street port 20B. At the turbine limit around 17psi... the 1.0 a/r is just too small... I need a bigger rear, but BW don't go bigger in the 300 range.

 

You can order a 1.1 300sx turbine housings from full race but that will still be way to small. It also more then double what the other housings cost for some reason.

 

So for the 20b does that mean the SXE 400 series that has up to a 1.25ar available is more suited. Or would it depend on whether your talking stock engine to modded.

 

Thanks for the first hand experience stokrx

 

For the turbine flow, I think yes.. The 300sxe69 compressor flows fantastic, if only you could get the bigger A/R!!

Not sure if a larger one could be made/modded to fit..

_Dave.

 

If you step up to an S400, there are different turbine wheels available. 83mm, 87mm, 96mm, & 110mm. You can look those phi charts on Borg Warner's Match-Bot, but here are some quick numbers.

An 83mm with a 1.0A/R flows about 9.4% better than a 80mm S300 with the 1.0A/R
An 83mm with a 1.1A/R flows about 13.8% better
An 87mm with a 0.9A/R flows about 18.1% better
An 83mm with a 1.25A/R flows about 22.5% better
An 87mm with a 1.0A/R flows about 26.9% better
An 87mm with a 1.1A/R flows about 31.3% better

The standard S475 comes with a 96mm 1.32A/R turbine.
That monster flows 45.8% more than the 80mm 1.0A/R

There are FOURTEEN turbine and housing combinations on the S400. Pick your poison.

 

With a stock port 20B what would you expect out of a 1.05AR 9174 T4 Twinscroll with EWG?

 

I think I may go with the S472SX-E with a 1.1 rear. Should make great power at a lower psi and will have room to grow. The response should be decent. Choosing a turbo is a pain in the ****! lol

 

What kinda hp and target boost are you ariming to acheve. I havent decide which turbo I plan to use for my 20b. I do have a brand new S475 with a T6 1.10AR hot side but I feel like its a overkill for my 20b. The Borg Warner S472-SXE seems interesting and a better choice for a streetport 20b.