Slower acceleration after cleaning MAF and changing the air filters

Cmike2780 · 03-12-2012, 11:01 AM

Quote:

Originally Posted by Kaiser370z

TerribleONE honestly i love the Z more than a Mustang
and come on i only faced some minor problems and the Engine and the Transmission are in a very good shape
so why should i sell my Z ??

He's kidding...sort of.

First, I would inspect to see if you re-installed all the intake parts correctly after cleaning the MAF sensors. Make sure nothing is loose and there are no leaks.

What kind of filters are you using? OEM? H

ow did you reset the ECU?

Kaiser370z · 03-12-2012, 11:03 AM

Mikes350z i always using the paddles if i want to test the acceleration of my car
before: the Temp. was 19C and these days is around 24 C
Gas Grade the Same as always 95 Octane premium ( the same as 91 in US ) but this is the higher gas grade we have
worm up time : a couple of minutes usually
tires : stock tires ( base model )
road condition: the same road
the filters : my car is a US Spec and it came with a red filter but the filters of the Gulf Spec are Yellow. So they are different. i installed the yellow ones after i noticed that the car is a little bit slower, i changed back to the old ones
but it didn't work

BigT · 03-12-2012, 11:29 AM

Do another run with the oil temps hovering just below the 180 degree mark and report back.

Red__Zed · 03-12-2012, 03:33 PM

While his speedo cam test may not be accurate, it should be sufficiently precise. Plenty of precision to note a delta t.

edub370 · 03-12-2012, 11:30 AM

If u could somehow edit the vids into 1 vid that would play the 2 side-by-side it would be easier to see what the differences could be. since u said u are using the paddles, the difference could be something as simple as shift points

TerribleONE · 03-12-2012, 12:57 PM

this is why I asked!

BigT · 03-12-2012, 12:58 PM

Also, recorded runs should be done on the same stretch of road so there isn't too much of a variance between going up or down hill.

mantella87 · 03-12-2012, 01:32 PM

I think it's all in your head bro.

Skull Crusher · 03-12-2012, 03:09 PM

Way to many variables to consideration and give an accurate answer. Unless you damaged the MAF in some way. Other than this, it can boggle the mind.

Cmike2780 · 03-12-2012, 03:13 PM

I also have a feeling the ECU reset had something to do with it. I think the ECU needs to re-learn everything before you get it running back to normal. Drive it around for a day or so and then run the "test" again.

03-12-2012, 11:30 AM	#5 (permalink)
edub370 A True Z Fanatic Join Date: May 2011 Location: KCMO Posts: 3,458 Drives: 09 370z S/T 6MT Rep Power: 22	If u could somehow edit the vids into 1 vid that would play the 2 side-by-side it would be easier to see what the differences could be. since u said u are using the paddles, the difference could be something as simple as shift points __________________ 09 370Z ST 6MT//Injen CAI//Greddy CBE//TP//TSW's//Swifts//Stillen lip//Whiteline sways 326whp/268tq

03-12-2012, 12:57 PM	#6 (permalink)
TerribleONE A True Z Fanatic Join Date: Jan 2009 Location: Socal Posts: 10,203 Drives: WOT Rep Power: 5852	this is why I asked! __________________ 638WHP 541WTQ @ 13.5PSI Build thread

03-12-2012, 03:13 PM	#10 (permalink)
Cmike2780 A True Z Fanatic Join Date: Jun 2010 Location: Long Island Posts: 5,059 Drives: slowwww Rep Power: 30	I also have a feeling the ECU reset had something to do with it. I think the ECU needs to re-learn everything before you get it running back to normal. Drive it around for a day or so and then run the "test" again. __________________ [09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R] [ArchitTEK Photography]

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03-12-2012, 11:03 AM	#2 (permalink)
Kaiser370z Base Member Join Date: Oct 2011 Location: Saudi Arabia Posts: 49 Drives: Varis 370z 7AT Rep Power: 15	Mikes350z i always using the paddles if i want to test the acceleration of my car before: the Temp. was 19C and these days is around 24 C Gas Grade the Same as always 95 Octane premium ( the same as 91 in US ) but this is the higher gas grade we have worm up time : a couple of minutes usually tires : stock tires ( base model ) road condition: the same road the filters : my car is a US Spec and it came with a red filter but the filters of the Gulf Spec are Yellow. So they are different. i installed the yellow ones after i noticed that the car is a little bit slower, i changed back to the old ones but it didn't work

03-12-2012, 11:29 AM	#3 (permalink)
BigT Enthusiast Member Join Date: Jan 2012 Location: NJ Posts: 469 Drives: 98 2g DSM Rep Power: 15	Do another run with the oil temps hovering just below the 180 degree mark and report back.

03-12-2012, 03:33 PM	#4 (permalink)
Red__Zed A True Z Fanatic Join Date: Jul 2010 Location: window seat Posts: 28,940 Drives: Mostly on two wheels Rep Power: 121	While his speedo cam test may not be accurate, it should be sufficiently precise. Plenty of precision to note a delta t.

03-12-2012, 12:58 PM	#7 (permalink)
BigT Enthusiast Member Join Date: Jan 2012 Location: NJ Posts: 469 Drives: 98 2g DSM Rep Power: 15	Also, recorded runs should be done on the same stretch of road so there isn't too much of a variance between going up or down hill.

03-12-2012, 01:32 PM	#8 (permalink)
mantella87 Track Member Join Date: Jun 2011 Location: Sacramento, CA Posts: 590 Drives: 2011 Z34 MT Rep Power: 16	I think it's all in your head bro.

03-12-2012, 03:09 PM	#9 (permalink)
Skull Crusher Base Member Join Date: Dec 2011 Location: NM Posts: 69 Drives: 2011 370Z Nismo 0478 Rep Power: 15	Way to many variables to consideration and give an accurate answer. Unless you damaged the MAF in some way. Other than this, it can boggle the mind.