it's usually the crappy dyno computer, not the pickup, that can't keep up

 

I am curious as to how this is possible as I have not heard of this in a modern ECU controlled engine. ECU's (int-x or other) normally need to know the amount of air entering the engine to provide the proper amount of fuel (at the desired air to fuel ratio).

How does the int-x know how much fuel to inject?

Does it guess or estimate the air volume via a data table (and throttle position) instead of reading it directly from the sensor?

 

With MAP it reads pressure in the intake manifold and engine rpm to calculate how much fuel to inject... I guess the int-x also looks at temp? Not sure, since my MAF temp readings are incorrect with the int-x installed.

 

And therein lies the problem with the Int-X.

It uses a MAP sensor to determine manifold pressure. The other side of the equation - temperature - is handled by the really coarse coolant temp and air temp compensation screens which don't even read the sensors correctly.
This, effectively, makes it a hybrid alpha-N type system.
This is why it is impossible to get an OEM-like tune out of it in its current configuration.

 

Jax,

Thanks. The CEL dissapeared after I released the Coolant Resevoir cap for a while. I think there was air trapped intermitently in the Coolant hoses.

 

well no damn wonder then(concerning the maf--now map and coolant sensors)
olddragger

 

Yuk!

This won't be seen on my 8 working that way - seems like the total tuning is just a Scientific Wild *** Guess (SWAG) - just a little better than a WAG.

So I assume you have to use the int-x because of the turbo? No wonder turbo cars are so hard to tune

 

So what happens during cold days when the air is more dense? If the MAF is not used during the tuning process wouldn't a cold day potentionally cause problems?

I talked to an FD tuner and he mentioned that this was one of the issues with tuning rotary's. Some guys who had there FD's tuned to the teeth would have to add more fuel, on colder days, manually. He did mention to me that they (they in this case would be the tuners he knows) do not use MAF sensors at all. In fact I looked under his hood and viola...No MAF.

Disclaimer: This information is being withdrawn from memory. I am no tuning expert by any means but I do have enough knowledge to be dangerous...LMAO! I only offer this statment for the sake of discussion. Should I creat a new thread on this?? I dont recall this being discussed before?

 

You can get a good tune with the Int-X - it will idle well and produce excellent power.
However, it will only do so if you are happy running rich everywhere except cruise where it can be lean or rich depending on the weather.
If you tune for OEM-like A/F at idle, cruise and light to mid throttle, the values will change as soon as the air density changes and the compensation table for that are too coarse and rely on bad data, which makes them fairly ineffective.

 

Hmm...this makes sense but seems inefficient. So then why is the MAF not used during tuning? I would think that utilizing the sensor would provide 2 benefits...1) Protection against variying air density (air temps) and 2) better milage (not that I care).

 

- On topic reply:

I orderd the cooling mod last week and should be getting it anyday now.

I will post my thoughts on it as soon as its installed and working.

 

cavemancan,

did you ever install the cooling fan mod? what are your thoughts? do you have any rough idle issues?


EXILE

 

For those who've installed this, a question. Is there any coolant mess when cutting the elbow out? I live in an apartment complex and don't wan't to kill any of the neighbors dogs and such. It's sitting on the counter now, installing this weekend.

 

Don't hate me but I got lazy and I have not installed it yet...

But I should install it this weekend.

Does anyone know if the cooling mod would work if I got the Racing Beat Flash?

 

no, very easy install.

 

make sure you do it when the car is cold, and no you will not loose any coolant.

beers

 

you slacker. it is a 10 minute install..

as to the rb flash.. the cooling mod would be redundant, and i would not run them together...

beers

 

i learned that the harder way. it was still semi warm and i got a little sprayed

 

sometimes old is good.

beers

 

well im still learning, so lesson learned. when messing with coolant hoses wait untill well cooled off.

 

I have the G-tech pro RR,and i calibrated with many dif cars.When i have problems with the readings in the idle,i turn the lights on,and i calibrated again with the lights up.Always the problem is gone.You must then,always,run that car,with the lights up.I read that trick in the manual off G-tech.In my RX8,i dont have the same problem also.
Another thing w,is that you dont have to calibrated in neutral.I find,the best way i think,is calibrated with the car moving.Because,you can be more precise with rpms keep steady.In neutral,is very difficould to be target the rpms needed.The only think with that mod,is to find,the best gear,to mutch the speed of vihiecle with rpms!

 

I fart in your general direction!

I kinda figured that running the two mods together would be redundant. What about the Interceptor-X? I believe it has the ability to run the fans sooner.

Basically I am trying to find a reason to keep the cooling mod or sell it. If the Int-x already has the ability to run the fans sooner then it makes no sence for me to keep the cooling mod.

 

it doesn't.

I don't know why people think it does.

 

It was more of an assumption than anything else. I figured since the stock ECU has control of everything then maybe the Int-X may be able to control the fans.

I will eventually get the Int-X but until I have enough money for it I think I will get the RB flash.

The cooling mod will just have to me kept in a safe place until that time.

 

i dont see how it would hurt if you have both, correct me if im wrong but i believe that the mazsport mod allows fan to kick on sooner than the rb flash. which would be working the same if you had the stock flash and the cooling mod. so all in all it would actually benifit the rb flash setup.