adjusting AFPR

[tip]

hello, i have a stock ECU, i've read that on 1 bar of boost the afpr has to be on 45psi or something like that. what i like to know is how much can i set the afpr at if i am boosting 12 PSI? now i'm boosting 10 PSI

the problem is the guy who set up the afpr adjusted it on 80psi, when i ask him why he cant answer me....

i have a garret GT2052 turbo on, the same guy who adjusted the afpr made the header for me, toyota caldina GTT fuel pomp (it delivers 255lph), FMIC, auto meter afr gauge(not a wideband).

i have noticed that the boost comes in late too at about 5000rpm. what could this be??

 

[AdamB]

80 psi fuel pressure? Thats way too much!
Get it set up on a wideband, every engine is different.

 

[Jay]

Yeah, as Adam says, fuel pressure should be set in conjunction with a wideband. Any decent tuner should be able to do a few fuelling runs and set it up accordingly. There are no set rules in doing this so never copy someone elses settings or you could blow your engine.

Jay

 

[tip]

thanks guys, i think this weekend i'll sort it out.

another question i am boosting 10psi now and i wanna boost 12psi but i still have the stock injectors. do you think they can handle that kind of boost??

 

[HYBRID]

on a gt20?? of course they can... tbh u can be running 1 bar without any problem... the gt20 gives roughly the same flow as the td04L and caps out earlier as its not that much of a top end turbo... boost is coming on very late coz to me it sounds like ur running way too much fuel pressure... (whcih btw denso injectors are not such a fan of running over 5bar of fuel pressure... remember fuel pressure is compensated 1:1 by most regulators... so the more boost you run the more pressure ur getting... ) so basically if ur running 80psi on idle.. then ur running over 100psi fuel pressure on 10psi of boost whcich equates to around 6.8bar of fuel pressure.. which i can assure you isnt needed in the least...

get a wideband mate.. also id suggest getting an egt guage.. just to monitor your egt's so that you can play with timing a little bit as its going to be needed as well to give you the most out of your setup

kon