How big injectors/ What apexi

[amballer82822]

Hey guys, I installed a Big FP T28 turbo and was wondering with what tuning device and inectors should go with. Im not looking to change the injectors or turbo for the rest of my cars life, also I want the Apexi, but what version is best for a 98 GSX also im running 93 octane gas at all times. So what version apexi and what injector size sounds good?

 

[liquidsilver]

Your profile sais you are rocking the 750s? Are you already tuning with your ECU? If so you don't need an SAFC. If you did get something else to tune with I would look into ECMLink. Just an option ofcourse. 750cc is plenty for a T28 and plenty for pump.

EDIT: on second thought I don't think SAFC works very well with that much injector.

 

[MY1GDSM]

Apexi? Forget it... Any size injector you want though keeping in mind the max you need but with room to grow for future upgrades... Buying things twice sucks...

But,
Your stock ECU is VERY powerful and actually is able to be tuned an modifed for about any setup you could ever want No different than other $500+ tuning solutions.

EDIT: While ECMlink is a great product you can(or someone else) do the same thing with a ECU you Already have for a lot less. Being you would need to source a 95 Eprom ECU or 96-97 and have it converted to Eprom...
Not even counting the Cost of link alone...

So basically For nearly the cost of another ECU just to use link you could already be tuning the ECU you have... .

 

[canada4g63]

If your staying on pump 93 then 750's are fine, you can use a super afc if that is what you have to tune with already.

 

[red_devil]

You cannot control 750cc injectors with an apexi afc. You have a 98 why not flash the ecu?

 

[amballer82822]

I can't find anyone to reflash my ECU, and finding a socketed ECU seemsto be impossible, that's why I was gonna just downgrade to 550"s and use Apexi neo Safc... Will thoose workout?

 

[deviousgst]

every car is different, but years back i was running 750's with a safc and it ran perfect. no knock or nothing. on 50trim

 

[canada4g63]

You cannot control 750cc injectors with an apexi afc. You have a 98 why not flash the ecu?

Please explain why you cannot????

 

[red_devil]

750cc injectors are just to big. The most people recommend using with the crappy safc is 550-650cc.

 

[bryanwheat]

Please explain why you cannot????

There are several reasons. First is that when you hide airflow from the ecu (what the safc does) the ecu increases timing. The more airflow you hide, the more timing advance you will have under boost. More timing on pump gas equals detonation. Another reason is that the safc only allows up to 50 percent correction. 750cc injectors are larger than 50 percent of a 450 cc injector, so you likely won't be able to pull enough fuel for the car to have a decent a/f ratio.