i have a 91 hb si getting aroung 40mpg now but if i say use an ecu and injectors from a dx or standard would this work and increase mpgs?

 

it could help...but i would just to a fuel system treatment...and a intake and exhaust...make the engine breath better, and it will get better gas millage...plus it will sound better...

also, did you do your 100K tune up? are your plugs and wires old...all of those can help your millage.

 

na, i use tranny fluid for that and in the motor. shes gettin great milage now at 40+mpg but would it run good if i swapped in injectors and ecu from a dx or standard and get say maybe 50+mpg??? thats my real question?

 

i wouldn't recomend it. yeah you could try it, but it would more then likely hamper the performance of the car then improve MPG

 

anyone got a standard ecu i can have? ihave some injectors.

 

It sounds like you're getting great mileage for an Si already. You'd probably see a better increase in mileage without losing performance by shaving weight and drag. Good luck with experimenting though.

 

According to the 2008 fuel economy stardard for your car, you should be getting 33 MPG or so. You might want to share how you are getting 40 MPG. I think 50 MPG might be a stretch. Keep us posted on your changes. Show us your logbook so the rest of us can see your mileage.

Here is my latest page for reference:

 

i don't have any logs, i just use my trip meter and fill it every time and check it. i've even gotton 45mpg. i just shift at 2k rpms, slow early, and drive as slow as possible. if driving like most speed deamons i get around 34. i'm thinking with a smaller cam and ecu to match i should get 50+mpg easy?

 

My brain does not think in terms of reducing engine performance. Good luck tho.

 

That seems a little over obsessive to me.... why don't you just buy a mopad or a bike if you want better than 40 mpg? I know gas prices suck but I would cut expenses elsewhere, that doesn't sound too fun or enjoyable.