GA16DET SAFC

[BeyondBiscuits2]

I have a '95-'99 GA16DET hybrid turbo car ('99 block, '95 manifolds & sensors), and my friend and I are working on hooking up an Apex'i S-AFC on the car. I have downloaded every manual I can find for the S-AFC, which is the older knob-style that Apex'i no longer has available on their website (I already checked and even called customer service). I am going to be running stock SR20DE and KA24DE injectors in my stock fuel rail, some sources say they are 259cc but I have read from some and been told they are 270cc? Anywho, there seems to be no GA16DE setting on this older S-AFC; go figure, a turbo 1.6 Sentra was not high priority in the mid-'90s I am sure. We have already worked out that there is a -27 correction curve between the 259cc and 185cc injectors, so if I want to run the car N/A I have to set it at -27 across the board. No big deal. Here comes my question (sorry, long-winded).

All the information I have on the S-AFC has given me only a handful of Nissan vehicle selector sequences for the device. At the moment, the S-AFC is set for an SR18DE engine, which we believe is similar in both sensor and stock injectors (259cc?). I am really just wondering if anyone else with a GA16DE has ever used this older style S-AFC, and if so, what engine they chose? I do not, at present, plan on upgrading to the 370cc injectors, and I really want to be able to run my car N/A if I need to without having to switch back to the stock injectors.

P.S. Apex'i is no help. They no longer have any of the manuals online, and customer service basically gives you nothing. If anyone just has the engine selector sequences for Nissans, or any sort of info that can help us out!

^--- this type of S-AFC

[nametakennow]

I'll do some research this evening and get back to you. Interesting question.

[BeyondBiscuits2]

Thanks for trying to help me out.

[nametakennow]

I've looked everywhere I can think of and it seems that no one with a GA is running an SAFCI.

Here's all the manuals I could find:

ManualUS UpdateWiringAnother Manual

I'll keep thinking of other places to look, but it may just be a matter of guessing til you find the right injector size since that's probably going to be the closest match.

I did manage to figure out that the GA16DE has 198cc injectors. See if you can find another vehicle with that size of injector.

[BeyondBiscuits2]

The last manual is the exact one I needed! Thank you so much!

I just solved both major questions I had: 1. do all Nissans have the same "type selector", 2. which Nissan engines use what "car selector". To answer no. 1, it is yes, except for the Nissan Terrano (no matter to me). No matter what type or size of engine, it is all the same: up, up, down, down, down, up, down, up. For no. 2, all of the SR-series use setting "6", and since both the SR20DE and KA24DE both run the 259cc injectors, I think that is the safest bet for me to try and use. If the "6" setting doesn't seem to be working well, I might even try the "9" setting for the CG10 and CG13, which are basically tiny GA-series engines.

As for the same injectors as the GA16DE, I think the VG30E (with side-feed) use the same injector, but just six instead of four? They are both pink in colour, and the only "pink" Nissan injectors I can find listed on that nice Nissan injector list floating around are for the GA16DE?

[nametakennow]

According to what I can find, VG30E injectors are 180cc, which is pretty close.

[BeyondBiscuits2]

Yeah, I just did a Google search for Nissan injectors and the ones I saw looked fairly similar to my GA16DE ones. Your ratings for the stock GA16DE injectors contradict everything else I have ever heard; 185cc or 195cc, not 198cc. Where did you get this figure, if I can ask (not to insult you or anything like that). My friend and I discussed how each injector (with the exception of th 370cc) seem to have different ratings depending on who you talk to. I always thought the stock GA16DE injectors were 195cc because that was what I always read; but then I was corrected that they were even less at 185cc. Same with the KA24DE injectors, my friend and 240SX owner said they were 270cc, but everyone else says 259cc. I am completely lost. Without the right cc, we won't be able to do the adjustment curve correctly (we used 185cc to 259cc to get the -27 correction).

[nametakennow]

198 and 195 are so close that it's possible that where I found it someone had mixed up a number.

You've run it with a wideband O2 sensor in, right? Honestly going by injector flow rates isn't exactly the best method. Finding an A/F ratio that keeps it from detonating is the safest/highest power-yielding bet.

[BeyondBiscuits2]

In all honesty, I haven't run my car on a wideband at all. I have only had the K03 on my car about three times in the last six months, and all three times have been basically for a day or 2 day stretches over the weekends. This whole turbo setup has sort of been a side project I have had in the works for a while. After each night of driving with the turbo, I've pulled the plugs (NGK G-power platinums) and checked for any evidence of bad fuel ratio. Only on the last occasion, after I took my car to the drag strip and ran it a few times at a full rpm spread throughout several gears did I noticed a slight discoloration due to leaning. But, that has only been at 4 lbs of boost, since I have yet to install my boost controller (factory wastegate is set a 4 lbs).

My friend and I are going to install the S-AFC this weekend, minus the KA24DE injectors. I want to bolt up the K03 and, using his wideband, make some passes to see if I even need to upgrade injectors. If I can get 4 lbs of boost without any fuel problems, and maintain it with the stock GA16DE injectors, I see no reason to do it (as long as it is not too much of a correction curve). Once we get it tuned for 4 lbs, over Spring Break we'll install the KA24DE injectors and tune it up to 7 lbs with my boost controller.

[BeyondBiscuits2]

We hooked up the S-AFC tonight, and it basically did not work! We tried every single combination for Nissans, and it didn't detect my MAF (wouldn't rev over 3000 rpms). We double-checked all the wiring, and everything was hooked up correctly. Does anyone know what engine people choose with their S-AFC on the GA16DE, because we surely couldn't find one that works! Do I need to get an SR20DE MAF or something?