I'm just wondering if anyone knows what circuit the rev limiter is in the S5 TII ecu

or if you can disable it

I'm working out the Problem with running N374 ecu's in north armerican cars
they are missing a knock control module or something???? but its as if they have the fuel cut the the rear rotor on constanly
but if you put a knightsport eprom in a n374 ecu it works perfectly...becuase they have the rev limiter removed
I want to get my Tom's racing ecu to work

 

I believe some of the JDM reprogrammed ecus have raised or removed rev limits as well as raised or removed fuel/boost cut.

However, the stock 13bt is not well suited to sustained revs above 8500 regardless. The shaft tends to flex and let the tips of the rotors rub the irons. Not to mention that a stock or hybrid stock turbo is much too restrictive to run at that rpm/airflow level, and will lose power versus simply shifting to the next gear at 7k.

 

Right, what he said....

But seriously, at 8,500 rpms you better shift or you're going to need a new engine soon. Typically if you are above 8000 rpm you are probably in some kind of crazy race and you have ceramic or carbon apex seals, which means that you have all kinds of fun stuff under the hood which means that you arent even looking at a stock ecu....heh

 

standalone FTW

 

lol i don't wanna remove it so i can rev the hell outta my car.....I'm trying to solve the problem with the N374 .....in a north american car they keep the fuel cut to the rear rotor on constantly

i just want to find a way to disable it

 

Search bitch.

Someone used a J-spec instrument cluster and made it all work.

It has nothing to do with the rev limiter.



-Ted

 

^^ Wow! ^^

maybe try a FCD?
or waht RETed said..... minus the "bitch" part....

 

The knock computer is built into the N374. As is overboost.

What RPM do you think that you are getting over rev fuel cut at?

 

0 rpm and up
the FCD might be a solution there! i never even thought about that lol

believe me i've been searching

 

Gee, do you think?

I mean come on... what made you think it was the stock rev limiter if it is happening at anything less than 7000 RPM?

 

Easy to eliminate overboost fuel-cut...

Unplug the boost sensor at the electrical connector.
Did the symptom change?
If not, it's not the overboost fuel-cut.


-Ted

 

He is getting fuel cut at about 3800 rpm. Secoundary injectors are not firing. He posted in another thread. https://www.rx7club.com/2nd-generation-specific-1986-1992-17/rear-primary-injector-not-firing-720885/

 

Actually no, on an n374 ecu the problem that arises is that the rear PRIMARY injector doesnt fire...thus the engine is hard to start and idle.

 

What I have found was the ecu will not fire the secoundary injectors. This is about the sixth n374 I have played with. I took a back probe and start the car. Ran the rpms to 4000 and it started to backfire. Their were no voltage to the secoundary injectors. So that tells me that the ecu is not sending voltage to the injectors. The car will start up fine and idle fine. Its only when you try to rev past 3800. I will dig further to see why this happens.
Thanks Robert

 

well, if you read the TITLE of the thread that you linked above, you will see he confirms what I said. This is apparently an issue seperate from what you are experiencing.

 

What you said technically doesn't make any sense.

(Positive) Voltage is sent to all fuel injectors (and ignition coils) from the main relay.
If there is no voltage, then you'd get no spark and none of the fuel injectors would be powered.

Are you talking about pull-to-ground signal from the ECU?


-Ted

 

You're wrong, he's not.
Wow, just wow. Better do a little research next time.

Carbon apex seals are significantly lighter than stock steel apex seals. This lower mass lowers the centirfugal force exerted by the seals on the rotor housings, and along with a less abrasive material, significantly reduces rotor housing wear. Their lower mass prevents efficient sealing at lower rpms, so idle quality suffers somewhat, but prevent apex seal chatter and float in the upper rpms. Carbon apex seals will not withstand any amount of detonation or preignition, and thusly should not be used in a forced induction engine. If they break, they typically do no harm to the engine. They are designed to be used in engines where massive revs are required to make power. They are typically used in 11,000 rpm+ N/A engines. Yes, carbon can withstand "10,000 rpm race standards".

In the future, I suggest you actually know what you're talking about before you act like an ******* and ridicule someone.

 

There was no signal from ecu. And yes the car ran.
Thanks Robert