An unexpected complication that I ran into recently was getting the factory B15/B14 oxygen sensor to thread into the GTi-R J-Pipe. The hole for the O2 sensor on the GTi-R J-Pipe is larger in diameter then the B15/B14 sensor.
There were a few ways to get around this. One option would be to get a properly sized weld-on O2 bung and have it welded over the larger hole in the GTi-R J-Pipe. I didn’t like this option because my J-Pipe was already finished/coated, plus I didn’t think that this solution would make for a clean look. Another option would be to have another O2 sensor bung welded into the down pipe and plug the O2 sensor hole in the J-Pipe with a suitable bolt. Again, this solution brings questions of how clean it would look.
With the help of some people on SR20 Forum, I found that the factory header comes with an adapter nut that would allow the B15/B14 O2 sensor to thread directly into the J-Pipe. My factory header was long gone, so the search was on to find this part. My searching helped me find that the part I was after is commonly called an “oxygen sensor nut” and that the Nissan part number was 20607-P6500.
I have confirmed that the part number listed above will thread directly into the GTi-R J-Pipe and allow you to use a B15 or B14 factory O2 sensor. I’m sure other sensors will fit, but I have only tested the B15 and B14 sensors.
Chris' 2000 Sentra SE, Parts & Vendors, Turbo Project
I had some concerns about differing part numbers for the 1993 Mustang SVT Cobra MAF that could be used with a JWT programmed ECU. Because of the age of the car, it was becoming difficult to find a new MAF. In addition, I found differing part numbers from what JWT listed.
Below is an e-mail from JWT stating what is needed:
The OEM stock 1993 Ford Cobra MAF sensor is the only MAF that we
program for and not any aftermarket MAF sensors that exist (ie:
Granatelli, etc.). There are two different part numbers associated
with this MAF sensor and the part numbers must be an exact match for
the MAF to be the correct one. Here are the part numbers for your
reference.
Ford Dealer parts number = F1SZ-12B579-A
Ford Engineering number on side of MAF itself = F1SF-12B579-AA and
also on MAF = AFH70-02
That cleared up the confusion I had, since many of the remanufactured MAFs had the F1SF-12B579-AA part number listed. Hopefully this will do the same for anyone who has similar concerns.
Chris' 2000 Sentra SE, Parts & Vendors, Turbo Project
While researching external wastegates on SR20Forum, I saw that Mike Kojima suggested using Synapse Synchronic wastegates for their superior response. Based on this recommendation, I went and did a bit more research. It turns out that Synapse Engineering has a group of great products!
Their wastegates and blow off valves don’t use diaphragms like other products which helps them respond faster to changes. In addition, their wastegates have built in boost adjustment which can eliminate the need for a boost controller for most people. They also have a fuel pressure regulator that will bolt directly to the factory fuel rails of most Nissan engines.
I’m no engineer, so below you will find links to Synapse Engineering’s website as well as links to videos explaining how their products work.
Synapse Engineering
Video: Tial WG Vs. Synchronic WG
Video: Synchronic BOV
More Synapse Engineering Videos
Chris' 2000 Sentra SE, Parts & Vendors