Should my LTFT be this high?

[Trader]

My long term fuel trims are the following:

idle = 4 to 6
Part throttle = 7.0
Engine breaking = 7.8
Medium throttle & WOT = 10.2

My only mods right now are the MSCAI2 with straighteners.

I have checked all the typical areas for leaks. I tightened up all the intercooler piping and intake piping couplers.

The car does not seem any faster with the intake.

 

[Sport6]

Hmmm my LTFTs are way different with the "old" mscai...

idle: -7
part throttle: -3
engine braking:-6
medium-wot: 0-1.6

on the way home ill make sure i have those numbers right

 

[bova80]

a good range to be within is +/-8%. The ecu won't throw a CEL unless you are +/-20% though.

 

[Trader]

What is typical for a stock MS3 with just a CAI?

 

[pwrful4]

Did you disconnect the battery during the install?

 

[Trader]

No but the ECU has readjusted. These LTFT are after about 100 miles.

 

[CWPspeed3]

I get similar numbers with my cobb sri after having it on since June. Hasnt caused any problems yet.

 

[Trader]

Yea I have read some people getting higher numbers, but there really is not a lot of response for what is typical or what should they be at. They just seem a little high for just an intake. I am going to check the air straighteners to make sure they are oriented properly.

Could people that have just a CAI or SRI post their LTFT.\

Thanks

 

[bscott2275]

cobb sri

idle 3.6
part throttle 7.8 to 8.6
wot 12.6

pretty sure those are the numbers

 

[Silver Ecstasy]

I think a lot of this could vary based on temperature too, especially considering we're posting from different climates right now.

 

[Sport6]

Yah my estimate was way off

its: MSCAI with the straightener
-3.1 idle
0 for light throttle
3.1 for WOT

I only travel about 3 miles home from work so maybe it wasn't 100% warmed up but I'll let you know if it changes on a longer trip

 

[Silver Ecstasy]

MSCAI v2.0

Idle: 7.8
Light to WOT: 3.9

Atleast 200-300 miles on the car since ECU was reset, and I did not baby the car whatsoever after I reset.

 

[mazdaspeedster3]

That doesnt seem to bad Mike! I am hoping to get my MSCAI on Tuesday morning first thing! Should be an easy install having done it several times and all I am doing is taking out my Injen.

 

[frito]

From the Cobb site.
"- One of the most important things you will want to do after you install a properly designed aftermarket intake system is to reset the ECU and drive at very light loads for extended periods of time after the installation. Resetting the ECU will erase any STFT and LTFT values which will allow the ECU to start
making compensatory corrections to the fueling calculations."

 

[Sport6]

Hmm maybe that why are lower than most? I babied it after the install cept for a few runs.

 

[mrmazdaspeed3]

how do you check these ltft is there a device i need or what? srry im a noob.

 

[mazdaspeedster3]

A dash hawk tells you all of these perameters.

 

[bykeryder4life]

guys you gotta take alot of things into account when dealing with fuel trims. where you live, things like elevation, temp, and any mods done will affect them. with the original style MS CAI(i dont know about the V2), the maf housing is larger than stock so this makes the cars run lean, particularly at idle. with the air straighteners they settle down a little bit. With the Standback I can just scale my maf voltage and adjust my trims where necessary with the maf x-fer.