Hi to all. A little background might be in order since I'm new. I'm 16, I'm from Maryland, and I currently have a 98 Gs-R. Hopefully someone can help me detirmine an appropriate fuel injector size to use. I currently have the stock B18c1 from the factory. No internal modifications. As for bolt-ons it has an AEM ram air intake pipe, Professional products 68mm throttle body, blox competition intake manifold, aem high voulme fuel rail, DC sports 4-1 header, magnaflow high flow catalytic converter, and a megan drift spec catback. I see the weak link in the intake system as the injectors. I think the stock gsr injectors are only like 175cc or something. I want to upgrade to a set of RC engineering injectors. I want to see if you guys think 310cc would be to much for my current setup. In about a years time I am going to rebuild my current motor with type r pistons and a brand new type r head. I will still be running the same intake and exhaust setup. I will either re-drill my current intake manifold to fit the type r head or just get another that will fit it. What ever size you guys reccomend will be used with both setups. Thats the only reason I listed the future one even though it probably has no bearing on anything. If 310cc is excessive what would be an optimal size to use? Thanks for any help you guys can give me. If you need anymore information about it please let me know.

 

stock in the gsr and itr are 240cc

you can not run 310cc injectors on the stock ecu, if you do get 310s you have to get an obd1 ecu with the ability to tune. hondata s100 or the like

the stock injectors are fine up to around 190whp. a stock itr makes around 170whp

if you change any of the internals on your motor you have to retune it, even a manifold swap will require a change in fuel pressure if you run the stock ecu.

figure out an end goal for the car before you mod. the brakes and suspension are already at the limit with stock power levels. bigger brakes and a better suspension setup are where i would start modding, not the motor.

 

Sorry I neglected to mention anything that was unrelated to the motor. Im running power slot slotted rotors on the front oem rotors on the rear and ebc yellow stuff all the way around. I currently have it lowered 1.75 inches on h&r lowering springs and kyb gr2 struts. I have a set of tien basic dampers but I dont see a need to put them on because i'm really happy with the current setup. Thanks for the answer. That is what i was looking to hear. As long as their good up to 190whp im fine; I doubt ill get near that. Thanks Again.

 

http://www.rceng.com/technical.aspx

 

i have many more mods than you do and trust me your injectors are fine. did you match the 68mm tb to the intake manifold? and why a dc header?

 

Yes I did port match the intake manifold with the throttle body. And as for the dc header it was $40 on craigslist. And it was better than stock.

 

And thank you for the link that was a good piece of information. It was really helpful with the formulas.

 

your stock injectors are fine for what you are doing....when you get up close to 200whp then you should consider changing the stock injectors.