What size injectors 550 or 660?

[92tsiawd84]

I am going to start upgrading my fuel system and I need some advice on what size injectors I need. I currently have a 16g and will plan on upgrading to a 20g in the near future. My plan was to get 660cc injectors, a walbro 255hp fuel pump, and a Apexi SAFC. I went to the performance shop, told the mechanic my plans and he said that I should get 550cc injectors instead so I wont have to calibrate them down to run race gas. I want to get 660's to prepare myself for the 20g however I want to be able to go to the track and run race gas. He said that he had 720's on his 96 eclipse and that he wasn't able to run race gas (?). Also, do you think that I would need a adjustable fuel pressure regulator? If so, which do you recommend? Sorry I don't know much about this myself. He would also do all of the tuning for me. Please respond ASAP because I want to get the fuel system in soon. Thanks.

 

[larryd]

For a 20G get 660s. If you run race gas you can use the S-AFC to lean the car out enough just fine with 660s.

With a 255 pump you should run a fuel pressure regulator, do a search for AFPR.

 

[DSM91]

They are both the same price anyway, so go with the larger. Bigger is always better, especially when it comes to fuel. It is easy to lean it out, but a whole lot harder to add it when you have already maxed your fuel system.

 

[92tsiawd84]

Thanks.

 

[DeathBeast]

Check this out from RRE

Thanx,
DeathBeast