How does stft & ltft work as far as idle and boosting? What are people stft & ltft? And what is people timing under boost? Just curious. And can you eliminate your maf sensor with the greddy ultimate? I'm asking these questions so I can know more in depth as to what is involved in tuning.

 

on a good tune fuel trims should be at 0.. meaning ur computer is not over correcting nothing.

and timing all depends.. if ur at 19 psi with water meth you should be pulling some were around 4-5 degrees

 

So I should be pulling 4 or 5 on top end? I think I'm pulling 2 or 3 only. And fuel trims should be at 0 both stft and ltft? Cool good to know. I think my partial throttle is alot cause I get a system rich cel on partial throttle and at idle sometimes. And my idles at low 15's

 

Not sure if you know what exactly the trims are for or not, but here is a quick and dirty description.

Short term trims - The ECU adds or pulls fuel to make the car run how it thinks it should. These fluctuate fairly quickly to maintain what the ECU believes to be the optimal air/fuel mixture.

Long term trims - If the short term trims are consistantly high or low, the long term trim will begin to move towards that number.

For example, if the LTFT is 0 and the STFT is at 25 for a while, eventually, the LTFT will start moving up towards 25. That way, the STFT will make smaller changes, but still be providing the car with the amount of fuel the ECU wants to see.

An important thing to note, though, is that I always say what the ECU believes is correct. The ECU wants the car to run at stoich (AFR of around 14.7). If are running boost, that is too lean and you want to add fuel. This is where the battle comes in with the cars ECU versus a piggyback. Crazy fuel trims will cause your car to throw error codes even though you are running close to stoich. A good tune should have the STFT and LTFT's pretty close to 0.

 

He may be tuning ur car to let ur oem computer do alot of fuel adjusments i dunno w.o seeing ur map!

if ur only pulling 2-3 u should be making great power.. but i hope u tuned it that aggressive on a dyno..

 

Nope street tuned. We tuned off of throttle position but next tune we will be tuning off the map sensor. And fixing those fuel trim so I won't get that nice lil cel

 

hey marcelo...check out this thread....it should answer all your questions.
http://www.3si.org/forum/f103/ultima...thread-368811/

 

How to remove AFM;

This is a simple operation that requires the optional greddy pressure sensor to be plugged into either of the inputs on the front of the emanage (yellow plugs).

1. open data sampler map (far right toolbar icon)
2. turn data sampler ON (click on/off icon)
3. select airflow voltage and log its voltages (you will need to select greddy pressure sensor in the IGN and INJ too )
4. drive vehicle and populate as much of the sample screen as possible (safest to do on dyno or track) but road is fine if you have enough demerit points
5. cut and past this populated data into the AIRFLOW OUTPUT map.
6. done

data sampling map

finished map


i have yet to try this but will be doing it very soon to see if it works with an maf

 

I like your quest! Lol

 

as soon as if fix my wastegate to manifold issue ill try it...i broke one of the bolts in my manifold so i have to dremel it out...yippee....so what all does our maf do? i know our intake temp sensor is in it but what else?...and after i try this should i just unplug my maf and start it to see if it runs? haha

 

LMAO UR SIG!!

My man i just bought a new turbo sc6265.. and i ordered my water meth kit. and 10 gallons of meth..

ill be running straight meth with race gas!

we shall see brother..

i do miss my 60-1

 

Huh!!! Str8 meth nuts!! Man your crazy. Damn it mike you should have given me your turbo and I'll give mines to Chad hahhahaha. He can't handle over 400 he might mess hi new twin disc up. Hahhahah j/k lol

 

haha ur right i wont be handling 400.. ill be handling 450 _____AAAA

 

Chad would you like to buy my old short block..

I might just order the new p-tuning one.. also do you want those rims?

 

maybe in the future cuz i dont trust these k1 rods, i just bought some mickey thompsons and another heavy thing to go in my block :X cough they are found on shirts.

 

its cool mike....you will probably win....but ill be running strait e85 and maxing out my turbo.....but just remember......if i dont beat you this is my excuse. damn high elevation......5500 feet hurts horsepower haha.....ive also heard theres a second diff in 1/4 mile tiimes between here and sea level....i had a buddy that had that sc turbo in a k20....he hit 500hp on 20psi with water/meth

 

someone put a sc6265 in a k20? that thing must of never spooled lmao.. evos run 8's with the 6265 and make 700whp+

 

yea it spooled quick......almost as fast as mine....his revlimit was set at 10k i believe so he had plenty of time to spool it

 

k20 rev like 10k lol those things rev high as hell in miami! good luck on trying to handle 450 whp! dont get to confident chad. your not a bro driving stick brother be careful. especially with mickey's!!

 

i was born for power... runs in the blood :D