so let me explain my situation, i have an s5 na engine and im swapping all turbo parts onto such ***, TII LIM, UIM, TB, Fuel rails, TII exhaust tii irons and i plan on running a bnr stage 2 or 3.. i think im gonna run 550cc primarys and 720cc secondaries. w will also be buying all required sensors like MAF, preasure sensor etc so pretty much im running an high compression turbo block. i was gonna look for a n370 ecu and send it to rtek for the 2.1 to be installed on it.. but after pondering this , im wondering is the n370 ecu required if im going to be running an rtek on whatever ecu i use.

also am i gonna need a tii engine harness since im swapping all this tii stuff onto my block..im just wondering because i have only worked with na rx7s and have no idea how different the harnesses are. i have heard of people modding the na harness for a tii swap so im assuming it will be fine.

Thanks in advance alex

 

You can't, the RTEK 2.0+ isn't out yet for the S5 TII's. But yes you would need the ECU first so they can chip it for you. I would not run that turbo setup with the stock ECU ever.

You need more fuel than that for a stage 2+. You don't need the TII harness, in fact you won't need to modify it at all.

 

oh i though for some reason i read that the rtek 2.+ was only for tii s5, not s4 yet, i must have gotten confused.

how much more fuel are you suggesting? like 4x720's or just larger secondaries?

And what do youi suggest i do for a computer then because im sure it will be awhile until i they come out with the rtek 2.+ fro the s5. i know s4 ecus have really different harnesses so thats kinda not an option. i was trying to avoid the standalone because of the price, but now im not sure what im gonna do

 

Yeah the rtek thing sucks. Not that much though because you'd still have to keep the restrictive AFM and the system generally has its limitations compared to a standalone so if you wanted to upgrade later you'd have to ditch it and waste money. The standalone thing is probably the worst part about owning an FC. Just something you have to do at one point. The only other option would be to get a stock turbo or a stage 1 and run the stock N370 with the sensors. Or you could religiously follow the FS section until you find a microtech/megasquirt/Haltech deal for less than $600 like I've seen lately.

I'm not sure about the fuel, you can look at the BNR thread in the dyno section to see what fuel setups people are running if you want.

 

The Stage 2 Rtek for S5 turbo ECUs has been available for months. http://www.pocketlogger.com/index.ph...age=2&ecu=S5T2

4x720cc injectors would be about the minimum you'd want to run injector wise for a hybrid that size. 1000cc injectors are the max you can run with the +- 37% fuel correction the Rtek offers.

 

oh well i guess they DO HAVE the rtek 2.+ for the s5 tii, what are the limitations of the afm, im not trying to build some crazy 500 hp setup, im lookin for around mid to high 2 hundred's also i have zero knowledge in tuning or building a standalone, which is why the rtek seemed like a good idea because it comes with preset fuel maps that you can tweak if you want...

i was also wondering is there a different s5 ecu that i could use besides the n370 because im sure all of you guys know, they arent exactly common lol i head that modded vert ecu can work for tii if youj run a piggy back of some sort or an rtek like thing, this is just somethin ive heard, no facts lol. if any one knows that would be great.

 

well i already have a set of 550cc, does it matter if i were to run like 550cc primarys and like 1000cc secondaries, or is better to run like 800cc secondaries(im not sure if 800cc are real im just using this as an example) and like 720cc primarys. if you dont understand what the hell im trying to say i understand. lol. i just wana know if i could run really big secondarys and small primarys.

 

Don't worry about the AFM unless you're trying to build a 400+ whp car. You can get into at least the mid 300s with the AFM in place. Solareon has a post showing his car dyno'd at 323whp using an Rtek, a BNR stage 2, and a 700/1000cc injector combo: https://www.rx7club.com/time-slips-dyno-128/bnr-stg-2-323-hp-884507/.

The thing with injector sizing is if they're too far apart in size, tuning the injector transition will be a lot more difficult. I wouldn't bother with 550cc primaries. You've got the 4x720cc preset built into the Rtek software, so 720/800, 720/850, 720/1000, etc... combos become relatively easy to tune. Idle and light load situations will already be getting the proper amount of fuel, so you'd just have to pull fuel under boost when the large secondaries kick in.

And then there's timing. You'll need to be extra conservative with 9.7CR rotors. Arghx has some timing maps over in the Rtek section you can check out. There's also in this active 6-port turbo thread: https://www.rx7club.com/2nd-generation-specific-1986-1992-17/s5-6-port-turbo-whos-done-questions-inside-890359/.

 

I'm pretty sure I've seen setups with 720cc primaries and 1600cc secondaries. I don't see why it wouldn't work? But then again I've never messed with an RTek. I wonder though, how did you get the T2 LIM to match the ports on the S5 NA 6 port? Did you port it yourself or just buy one already port matched? I wonder because my friend is thinking about going turbo soon (he has an n/a) and I'd be helping him. Is it difficult or just a little grinding with the die grinder?

 

1600cc secondaries are common on setups using a standalone, but the Rtek 2.1 can only adjust fuel by 37% from the preset. Since the max injector preset is 720cc, 1000cc would be the largest size you could still control (38% larger than a 720cc injector).

 

well i havent actually matched the LIM, but from what i have heard, its rather easy, little amount of grinding and you should be good. ill let you know in a bit

 

N374 works for an Rtek installation. it's listed on the rtek website

 

oh i heard its only the n374 ecus with a knight sport chip, but the knight sport chip its just a fuel cut defender, and a speed limiter delete right. ironically it seems like there is more n374 ecus than n370's lol. ill keep my eyes peeled

 

Yeah, there's finally a use for all those N374 ECUs floating around. Rechip 'em and put them to work. The N370 ECU is getting rare and overpriced anyhow.