Is it worth having the Utec installed with the map sensor and tuned if you are heavily NA modified instead of tuning with the maf sensor?

Sincerely Glen

 

well if you tune it with the map sensor speed density mode you will weed out all the computer related problems that occur with this car...

 

huh?

 

well as we all know the stock computer does some weird things. when it does, it alters the timing and the maf voltage. say limp mode for instance...


well, if you are entering injector pulse widths and timing values, it takes all the computer correction problems out of the car.

 

You can come really close to maxing out the stock MAF with a heavily modified NA car. This car is pretty weird when it comes to tuning and making power w/ NA (or FI as a matter of fact).

 

Well im going to go with the map sensor then.

Thanks alot everyone

 

that would have to be the upper echelons of NA tuning....a limit I doubt anyone here, aside from Richie, has achieved. If you are seeing that high of a MAF limit and you are still NA, you've either got a total freak of a motor (in which case it should be putting down very high hp/torque), or you're not properly tuned.

once the utec is in the equation, all the idiosyncracies of the stock ecu are out the window - that is the purpose of the utec, is it behaves the same on day 1 as it does on day 1001 - you tell it the fuel to run, it runs it. You tell it the timing to run, it runs it. Provided you stay knock free (ie bad gas), it will do the same thing each time.

 

there is no way anyone is maxing out their maf NA, i am getting it to read 5.0 volts at 7-8 psi, its just not possible.

i think someone said that a while ago and now people believe that for some reason. plus most NA fuel maps take out fuel off the maf sensor.

 

I could buy a super high performing NA car running a close to max'd MAF - that's the only reason why the S1 motor runs the larger MAF housing as far as I can tell. But yes, there is no way any of us here are at, or even approaching those limits.

In other words, there is zero benefit from running an NA car MAP based

 

wouldnt it make it harder to tune? for NA atleast..easier for FI.

 

the only difference is that you would be entering in actually injector pulse widths, instead of maf voltage up or down.

so yes it would be more difficult because you have to know where to start and end up with actual IPW numbers instead of playing with % up or down...




im sure the nismo offers a larger maf because our stock one is 2.75 inches across and the throttle body is 3 inch. that would allow for more air to come into the engine and is good for a few ponies.

 

but the opening to the plenum is still only 2.75 inches...which is why doing a larger throttle body does not yield impressive gains. No matter what size TB you put in, and what size MAF housing, you're still squeezing the air through 2.75 inches at the plenum itself

 

i didnt know that, i actually have one sitting right here and it is getting ported out really soon now that i know that. i planned on getting a 2mm TB here soon to see what happens. i was going to matchport it the the TB. never measured the inside of it...


thanks

 

Im still going to go with the Map sensor. This way im trully running off the Utec.

Sincerely Glen

 

The UTEC runs the car at all times. Even when you have ECU entered into the fuel or timing map. The UTEC will only fire the coil or injector at the same point the factory ecu would if you have ecu in the map. When you enter a value into the Timing map the Factory ecu has no control of the Igntion. When open loop fueling is enabled, Speed Density or MAF the factory ECU cannot effect the afr that you are running.


Thanks,

Jermaine~

 

im sorry but i disagree. my proof is this. start your car when it is cold, and then try to go fast without it getting to temperature when it stops running in limp mode.

the car still runs in limp mode until it warms up which means, even when you are in MAF pulldown NA in open loop, its still affects the percent of what the ECU would do.


even with the utec installed running NA, MAF pulldown, and open loop, my car would run like crap sometimes, it doesnt override it until you are entering actual IPW....

 

I decided im going to have the map sensor installed with my tuned Utec. Either way I look at it its still going to be upgrading. I heard before that when MAF sensors start to die they lose voltage anyways over time. Either way if i dont make more power with the map sensor im sure I cant lose any either. Please correct me if i am wrong.

Sincerely Glen

 

Perhaps your car needs some tuning work then. My car has had the UTEC since January (one of the first cars to have it), and it runs the same today as it did then. As mentioned, there is no advantage whatsoever to running the MAP sensor on an NA car. If it makes you feel better to run it, go ahead, but it's not giving you any advantage at all.

 

Ok, so you are going to tell me how the UTEC works. If you are using open loop fueling and your throttle position is greater than you OLF threshold point your factory ecu has Zero control of your Injectors.

Thanks,

Jermaine@turboxs.com