So those of you with intakes... come in here please... v.MPG

[seven]

So I've noticed my cruising MPG (the one in the dash) has been a good bit better after installing the Injen intake (and Perrin pulley too - install at same time) I bought. If I'm in 6th and rolling in the city at 45 or even on the highway at 65ish... It seems like before it'd read 30-34mpg and now it's showing 40+... Which is definitely awesome...

I assume this is because the intake is leaning the car out a bit, which is fine and expected... I just haven't put a full take thru it yet... So I'm wondering if the MPG meter in the dash is fooled, of if you highway commuters with intakes are really noting better cruising MPG?

Thanks

[whataboutbob]

Put my aFe in last Friday. I'll be back here to provide some input when I have it.

[Drift-Office]

Originally Posted by seven

I assume this is because the intake is leaning the car out a bit, which is fine and expected... I just haven't put a full take thru it yet... So I'm wondering if the MPG meter in the dash is fooled, of if you highway commuters with intakes are really noting better cruising MPG?

Thanks

Well, there's alot of assumptions here - This is what I've done with our tunes that are in currently development.

1) Reset your AVG MPG meter and then drive like you normally would and let that figure settle. It's done over a period of time, not calculated instantly.

2) If you were correct in your assumptions, then you'd be getting well over 400Miles per full tank of gas. If you are, please let us all know.

Cheers,


Bob @ Drift-Office, LLC

[JoeBoxer]

I think he is talking about the current mpg display not the average one. I was getting 36 yesterday before the e85 with cruise set at 70mpg. I don't see those figures very often though.

[seven]

Originally Posted by Drift-Office

Well, there's alot of assumptions here - This is what I've done with our tunes that are in currently development.

1) Reset your AVG MPG meter and then drive like you normally would and let that figure settle. It's done over a period of time, not calculated instantly.

2) If you were correct in your assumptions, then you'd be getting well over 400Miles per full tank of gas. If you are, please let us all know.

Cheers,


Bob @ Drift-Office, LLC

Bob, I reset the ECU (as many say to do) when I put the intake in. I believe this resets the AVG MPG meter (I did reset it tho either way when I did the install just in case)... However I was referring to the REAL TIME MPG meter. Not the average one.

Originally Posted by JoeBoxer

I think he is talking about the current mpg display not the average one. I was getting 36 yesterday before the e85 with cruise set at 70mpg. I don't see those figures very often though.

You are correct sir.


I can't wait to get an E85 tune in this thing and open up the exhaust. However to visit family in Philly for Xmas, plane tickets were $650. Looks like the tune/exhaust will wait til sometime in the new year.

[ChaChas345]

Originally Posted by seven

Bob, I reset the ECU (as many say to do) when I put the intake in. I believe this resets the AVG MPG meter (I did reset it tho either way when I did the install just in case)... However I was referring to the REAL TIME MPG meter. Not the average one.



You are correct sir.


I can't wait to get an E85 tune in this thing and open up the exhaust. However to visit family in Philly for Xmas, plane tickets were $650. Looks like the tune/exhaust will wait til sometime in the new year.

Well if its reading like that then check how many miles per fill up it is. It should be a little more then average of what you were getting before.

[seven]

Originally Posted by ChaChas345

Well if its reading like that then check how many miles per fill up it is. It should be a little more then average of what you were getting before.

I understand that, (and if you'd have carefully read the original post you'd have noticed) I was saying I haven't had a full tank yet - so I was curious if others have experienced this before I start to measure.

[2forme]

Leaning out is OK to a point. I would be a bit concerned if you were getting 45mpg. That sounds wayyy too lean to me.

[seven]

Originally Posted by 2forme

Leaning out is OK to a point. I would be a bit concerned if you were getting 45mpg. That sounds wayyy too lean to me.

Right, I've rarely seen an intake make it too lean to that extent, I'm kinda wondering if it just throws off the little on board computer that does the realtime mpg.
Will have to start recording results whenever I finish this tank (sometime next week) for a full one.

[arghx7]

The current MPG calculation relies on the MAF calibration and fuel trims. You changed the hardware, so the mpg calculation can't be fully trusted.

[mashal]

400 miles out of tank?? That's like 620 km for us Canadians , I only get 400 km per tank .. Heavy right foot I guess


I-Tapatalk

[2forme]

Originally Posted by seven

Right, I've rarely seen an intake make it too lean to that extent, I'm kinda wondering if it just throws off the little on board computer that does the realtime mpg.
Will have to start recording results whenever I finish this tank (sometime next week) for a full one.

Well I believe I've seen a couple dynos showing an intake leaning out to 14:1 under high RPM/high load. This is entirely too lean. 13.5 is the highest I'd go, IMO.

[seven]

Originally Posted by 2forme

Well I believe I've seen a couple dynos showing an intake leaning out to 14:1 under high RPM/high load. This is entirely too lean. 13.5 is the highest I'd go, IMO.

I agree. 13.5 is about as lean as anyone would want to go all motor.
When I used HPTuners with my Corvette (11.5:1 built motor) we did 12.5:1 to be safe.

[seven]

Originally Posted by arghx7

The current MPG calculation relies on the MAF calibration and fuel trims. You changed the hardware, so the mpg calculation can't be fully trusted.

Ah. ok, so the MAF is skewed and therefore the data is too.

Thanks sir!