I know that you have to use 89 or better once you start using the piggyback, but does the MPG go up or down compared to the stock program?

I'm thinking that it optimizes the ratios and leans out the fuel a little and therefore improves it, but I'd like to know if I'm completely mistaken.

 

I believe that you are correct, but don't mark my words.

 

ROCK, if you have some free time, can you chime in on this? Thanks.

 

I have been making the same question to me .how the mpg will be affected by the piggyback? thanks rock in advance for your attention on this!

 

i could totally be wrong, but i THOUGHT this richens the fuel a bit, to help comply for the additional air flow with all the bolt on mods. (intake, exhaust, downpipe, manifold ect...)

could be wrong, thats just what i assumed the hole time

 

When I put my piggy on, I actually got better gas millage... not much, about .5-1mpg better. With all my mods, I prob get around 2mpg better over stock if I stay out of MIVEC range. After all the engine is just an air pump. The more efficient you can pass it through, the better the gas mileage.

I believe the piggy leans the mixture a little?

 

Yes, I too have heard that the piggy leans it out a bit. The RA from factory does run a little rich....so I can't imagine it needing to run richer with the bolt ons.

 

Most cars tend to run rich from the factory for safety reasons.

Thanks for the replies guys.

 

I haven't noticed any change in mileage with my piggy. It *does* lean out the mix, but only in open-loop operation, such as WOT. When you're just cruising, the ECU still gets feedback from the O2 sensor, and will adjust fuel accordingly.

Having the extra power on tap is nice, but if you're expecting to have fuel savings cover the cost of the piggy, it's not going to happen.

 

Are there any dyno sheets around from an RA with only the piggy?

 

If one were to drive like grandma around the streets/freeways then they might see a 5mpg increase with the Piggy, but to have a piggy and not mash on the throttle is pointless. I never get any better mileage but thats only cause its so much more fun to keep my foot on the pedal.

 

Unlike you, most of us don't gun it at every stop light, every shift, every tank of gas.

 

yeah, I just got 32 miles to the gallon coming home from Sylva, NC which is about three hours away.

 

piggyback does such a small difference on gas milage, i cant beleive we're still talkin about it...



tip to save gas - buy a hybrid