is it bad to buy to big of injectors ?

[Jason84]

im going with a full garret t3/t4 50 trim.

im going to throw on a walbro 255 with an aeromotive FPR and a new fuelrail possibly. im thinking of going to like the 720 denso injectors.
but is it bad to go to big? or should i just get the 660s?

 

[MNGSX]

You can go too big.

It all depends on their response speed (on off cycle rate) and the degree of injection control you have. Injector speed (dead time and a bunch of other names) is a function of injector design (disk vs pintle etc) and size.

Some stand alones can make giant injectors work just fine where as most piggy backs are a bit limited. It requires good quality fast injectors.

DSM link can make average speed 720's idle and part throttle like stock if you set it up right. A standalone like a Halltech E11 or something can make fast 1680 cc injectors idle just fine.

Don't get carried away with injector sizing if you are just going to run a piggy back.

 

[Jason84]

i am going to run the AEM system.

and are denso a higher end injector ? or is there much better?

 

[MNGSX]

Look on the AEM forum for a calibration file from someone with that turbo.

I have seen and downloaded a cal file for PTE 1000cc injectors from there.

I'm still kicking ECU tires and going over software and real world calibration files on each at the moment.

 

[Jason84]

i only live 3 hours from an AEM tuner. if its not to expensive im going to have them tune it for me when its all done.

but its just a daily driver car im not trying to do 10 seconds or anything but mid 11s would be nice

 

[MNGSX]

Well tell the guy who is going to tune it the turbo specs and ask him. You will then get what he is used to tuning with.

 

[Jason84]

yeah hes got a supra w/ single turbo. hes not like a certified aem tuner or anything but hes got his supra tuned pretty well from what ive heard.

guess ill see how it goes when its all done heh.

 

[13secGST]

720s are good for a 50 trim...

 

[peregrine]

Originally posted by 13secGST
720s are good for a 50 trim...

so are 660s ESPECIALLY with an afpr.

 

[nowayout]

720 you will get better timing with lower injector duty cycles with stock ECU. If your using AEM that another story in it self.