Premix your 8, get better gas milage

[Herblenny]

I wanted to bring this topic back up as I believe that my cause to get a new fuel pump/filter was due to pre-mix. I've also talked to one of the GA RX8 owner who tracks and he has stopped using pre-mix on his 8.. Similar reasons to why I stopped..

So, before you start using pre-mix on your Renesis, please think twice!! It costed me close to $500 to replace the pump assembly.

[SPICcnmFD]

Originally Posted by Herblenny

I wanted to bring this topic back up as I believe that my cause to get a new fuel pump/filter was due to pre-mix. I've also talked to one of the GA RX8 owner who tracks and he has stopped using pre-mix on his 8.. Similar reasons to why I stopped..

So, before you start using pre-mix on your Renesis, please think twice!! It costed me close to $500 to replace the pump assembly.

I've heard the same thing from various track guys.

[05rex8]

Originally Posted by Herblenny

I wanted to bring this topic back up as I believe that my cause to get a new fuel pump/filter was due to pre-mix. I've also talked to one of the GA RX8 owner who tracks and he has stopped using pre-mix on his 8.. Similar reasons to why I stopped..

So, before you start using pre-mix on your Renesis, please think twice!! It costed me close to $500 to replace the pump assembly.

you could have cleaned the fuel pump sock or replaced the pump yourself for ~$125
it does help however to have the SST for removing the pump, but not needed

I would rather spend $125 or even the $500 you spent if it meant not having to buy a new motor due to lack of lubrication

[Herblenny]

Originally Posted by 05rex8

you could have cleaned the fuel pump sock or replaced the pump yourself for ~$125
it does help however to have the SST for removing the pump, but not needed

I would rather spend $125 or even the $500 you spent if it meant not having to buy a new motor due to lack of lubrication

I've heard that argument when I first bought my FD back 10 years ago.. People back then told me I should be pre mixing my FD... which I never did.. and I didn't loose my engine because of the wear.. And most I know either lost their engine due to bad tune (apex seal) or coolant failure. And for NA RX7, there are people who never pre mix'd go 200K.

If you look at the design of the Renesis, it already shoots in more oil than REW.. I'm sure more oil and premix might help lube the apex and side seals, but personally, I don't think it makes much difference but who knows.. But I think it does more damage when you might either detonate because less fuel is going thru or you get break up because your pump is no longer sending enough fuel.. When I first experienced problem with my 8.. It felt like I was having ignition issues.. Which I didn't know it was the pump until I took it to the dealership.. Hence why I didn't do that job.

[mazdamaniac]

Originally Posted by Herblenny

I wanted to bring this topic back up as I believe that my cause to get a new fuel pump/filter was due to pre-mix. I've also talked to one of the GA RX8 owner who tracks and he has stopped using pre-mix on his 8.. Similar reasons to why I stopped..

So, before you start using pre-mix on your Renesis, please think twice!! It costed me close to $500 to replace the pump assembly.

Pre-mix has no appreciable effect on your fuel pump. If anything, it will increase its lifespan.
The problem is the crappy Arram pump unit Mazda used in the fuel pump assembly.

You can read about this here:

http://rotarycarclub.com/rotary_foru...ead.php?t=8540