How much MPG does a Dinan Supercharger get for an e36 M3?

[D Unit]

Dinan told me that it's roughly the same, but I'm not sure if I believe that. Can someone tell me first hand?

[datboibrad]

Dinan told me that it's roughly the same, but I'm not sure if I believe that. Can someone tell me first hand?

not sure how different super chargers are in comparison to turbo's when dealing with boost, but from my history of turbo hondas gas mileage never changed under normal driving conditions depending on how partial throttle was tuned. but when your floor it then things go down drastically in some cases. But i agree with Dinan for the most part that you wont notice a huge difference unless your driving hard

[shark328]

I can get up to 25 on hiway if I take it easy but tha's not as much fun!

[///3oris]

not sure how different super chargers are in comparison to turbo's when dealing with boost, but from my history of turbo hondas gas mileage never changed under normal driving conditions depending on how partial throttle was tuned. but when your floor it then things go down drastically in some cases. But i agree with Dinan for the most part that you wont notice a huge difference unless your driving hard

Yes, except with a turbo you don't have drag on the engine and you only use more gas when you make more power

You will see less MPG than your stock setup... depending on how heavy your foot is I'd say on average 2mpg. Not a big deal considering.... plus, gas is relatively cheap.

Boris

[lkstaack]

My highway milage went from 25 to 23 MPG on the highway after my stock Dinan SC. However, you'll find a significant decrease in city milage due to larger injectors, aggressive tuning, and a heavier foot. It gets even worse when you upgrade hardware/software. I mean "worse" in a good way.

[resisTm3]

my MPG went from 19 - 25 when i installed my AA S/C

[kobe 8]

i get 18mpg city on my dinan sc...

[Shuasha]

my MPG went from 19 - 25 when i installed my AA S/C

I think I've averaged about 5 mpg since I got mine installed.. but that's more of a matter of me enjoying the turbo.

[Mjollnir]

plus, gas is relatively cheap.

Boris

[Goathumper]

Damn. im lucky to get 16 mpg on NA, although i am never under the speed limit. I used to own a taurus that got about the same gas milage averaging 70mph as my bimmer dose as 110 so to maintain my old budget i had to adjust my driving style a bit

[Croak]

I get about 12-15 in the city, with a lead foot and a lot of stop and go. Increasing boost and going with larger injectors didn't change the MPG enough to detect. I'm in the low to mid 20's on the highway.

I suppose I could pick up an easy 5 MPG if I altered my driving style, but giving up that fun isn't worth the $10-$20 a month it may save me in fuel.

Pre-SC with Euro HFM and 24# injectors I was getting 16-19 MPG on the same daily route.

[shark328]

I don't think anyone can resist that!

[99M3]

my MPG went from 19 - 25 when i installed my AA S/C

That is because you are incorrectly looking at the calculated MPG on your OBC.
Once you put in larger injectors, your OBC will calculate grossly optimistic mpg.

The correct way to do this is to manually calculate your mpg by dividing your odometer count with the amount of gas you put in.
Or you can buy a device to correct your OBC.

[Steven Menk]

The correct way to do this is to manually calculate your mpg by dividing your odometer count with the amount of gas you put in.
Or you can buy a device to correct your OBC.

I was wondering about that as I'm getting ready to install my Vortech. Who makes such a device?

[resisTm3]

plus, gas is relatively cheap.

i now pay 2.55 for 93 oct.

[paul e]

I get about 12-15 in the city, with a lead foot and a lot of stop and go. Increasing boost and going with larger injectors didn't change the MPG enough to detect. I'm in the low to mid 20's on the highway.

I suppose I could pick up an easy 5 MPG if I altered my driving style, but giving up that fun isn't worth the $10-$20 a month it may save me in fuel.

Pre-SC with Euro HFM and 24# injectors I was getting 16-19 MPG on the same daily route.

Exactly right. Those OBDII owners who think that gas mileage must go way down because of the supercharger, regardless of the way they drive, have to understand that around town, closed loop mandates the same afr regardless of injector size, and regardless of whether or not there is a supercharger present. The only way I can see mileage going down is near WOT, in open loop mode. There, the determining factor will be the software maps and resulting afrs.

[ADVANT123]

Paul, I disagree. Superchargers create drag on the system, thus eating more gas. The engine has to work harder to do the same amount of work. Same concept applies with air conditioning.

[DefactoM6]

I'm just curious...and you knew someone had to ask at some point...but given how concerned you guys are with HP and your quest for it...why are you worrying about MPG of all things? That usually one of the last concerns of enthusiasts playing in the F/I realm...

[Croak]

Paul, I disagree. Superchargers create drag on the system, thus eating more gas. The engine has to work harder to do the same amount of work. Same concept applies with air conditioning.

Soon as you start producing some positive manifold pressure, you start counteracting the parasitic losses. Now that I'm running a MAP sensor, I see myself getting positive pressure (~0.5-2psi) in low RPM/low load areas where my standard boost gauges showed no increase.

[paul e]

Soon as you start producing some positive manifold pressure, you start counteracting the parasitic losses. Now that I'm running a MAP sensor, I see myself getting positive pressure (~0.5-2psi) in low RPM/low load areas where my standard boost gauges showed no increase.

interesting point.. I suppose, then, if you so a LOT of in town driving, when youre spending much time not using the boost and therefore not making the positive mani boost you refer to, then, I would think the drag on the crank would have its biggest percentage effect, so perhaps, there, it would account for lower mileage.