Injector Sizing/Fuel questions

[SrtDsm]

Ok I am looking for some injectors but I am not sure what size to get. I have an evo 3 16g, hks 264 cams, downpipe with cat eliminated, walbro 255 with rewire, safc 2. I am looking to run at most 20 psi. More likly I will stay between 16-18 psi. Would evo 560's work or would some 660's be better? Would either be easier to tune with? Also I am not real familar with adjusting fuel. Do I need a afpr or could I get by without for awhile? I know I need a wideband afr guage (just have narrow band). Is there anything else I will need to get the fuel I need?

 

[92AWDHX40]

Get some 660s at least and tuning devices wideband, logger, link. A 190 will work fine, tune for knock, 550s will work but i wouldnt chance it keep a eye on your air fuel rations thats about it.

 

[Absit]

Smaller is always easier to tune with, especially on an SAFC, if you're not going to get a real tuning solution don't go larger than 660. What's your goal for the car?

 

[SrtDsm]

All I plan on doing is adding a front mount intercooler and running 16 to 18 psi so Im hopeing to get close to 300 awhp.

 

[skatershawn]

you really should use an afpr especially with the wally 255.. and i would go with the 660's!
it shouldn't be much harder tunning for those as it will for 550s. But 660s at 20psi should get you your goal with a good tune and whould be pretty fun!
Everything else seems good.. altho if it hasn't be changed in a while i would get a new fuel filter with putting the new injectors on!

 

[GRAVEDIGGER]

Go with the 660's and get an afpr and guage so you KNOW what you've got.