So.. I've had the plenum spacer on and the Nismo intake for around 2 months now. The Invidia exhaust was installed a few weeks after the spacer and intake.

While I had the intake on with the plenum, my gas mileage was great. Roughly 24-32 mpg, depending on how heavy my foot was feeling.

Now, I'm getting 19mpg - and rarely ever pushing my car.

My question is, could the exhaust really be effecting my gas mileage? I reset the ECU when installed the plenum and intake, but not the exhaust.

The only thing that I can think of, is to reset my ECU again. Anyone else had to do this with these parts? Anyone notice any difference(s)?

-Hal

 

haha... i get 19mpg anyways... and i'm stock... let me give you a warm welcome to the club

 

ive got everything u have, but with a nismo catback.....im getting 19-21 mpg city. it varies.....

maybe u have bad gas haha

 

I was getting 23-24, but as soon as I put on the MREV + spacer, it went down to 20-21.

more power = more gas
simple equation.

 

When I reset the ECU after the plenum.. my gas mileage was still 23-24.

The only change in gas mileage has been after the exhaust - 19

 

pssh, i would love to get 20mpg...running extremely rich with FI kills your gas mileage.

Check your tire pressure as well.

 

Tire pressure, all normal.

Has anyone else reset there ecu after the plenum/intake/exhaust? Or installing any minor mods/aftermarket mods?

 

i reset mine after the plenium install....but only cuz you need to. i just assumed due to the modz and the car needing more fuel for the power....my gas mileage would go down a lil...and it did.

 

Do you have to reset your ecu after plenum's or exhausts ?

I was under the impression that the ecu will automatically adjust. No real need to reset. How do you reset or re-flash the ecu anyways.

BTW my mileage has always been around 19-21. I have same as you pretty much.

 

How did you determine your mpg before? Because on a VQ 24-32 is a tad high

 

she has a 350z hybrid

 

lol - damn, i should of gotten the hybrid version!



how did you come up with the 24-32 range? that seems really really high.

24 is about tops for this car, i thought. and thats cruisin 70mph on the freeway.

 

Wouldn't that be the 350Zh?

I've seen 27 cruising at 70 before, but I normally see 22. Lately, have been staying at home and only driving to and from work (2.7 miles). Talk about sucky mileage, 14mpg. It says i am averaging 19mph. bunch of red lights on the way to work. Guess, i need to head out to the weekly meet to get my numbers up.

 

and the price of gas today makes me want to shoot myself

 

ive seen u drive....there is no way ur were getting that good of mpg

 

Mpg is on the clock/dials on the dash. That's where my numbers are coming from. Maybe I'll try and reset the ecu again and see if anything changes.

 

Tell me how your reseting your ECU. maybe thats the problem.

 

yea me too i need to reset mines but i heard that unplugging the battery for a while wont work :/

 

Resetting the ECU w/ the gas pedal method takes 30 seconds...very easy...at least in the G35. Should be the same for 350Z.

 

yea i heard about that... i tried it but i think i did it wrong.. lol