Finally Maxed out the SR Injectors

[Jookmasta]

so as some of you may know, i recently fixed my boost leak problem and i went from spooling at around 4500 to now virtually having no lag. This is with a str8 T3 BTW. So last nite, me and my friend went street tuning and i also installed a Joe P MBC due to the internal wastegate opening up around six psi. So i set the MBC and was boosting eleven pounds all nite. My a/f's stayed in the high elevens and twelves but i could not get them to go lower with the SAFC. the entire high throttle map was at +50% and very minute changes took place on the A/f's but to no avail, the A/F's stayed in the high eleven's and twelves. This was done with an innovative wideband BTW. So my quest for the 13 pounds was cut short. Now the only thing i can do now is try to mess with the fuel pressure as right now i really dont know where its at. so now its time for a new fuel setup to achieve more power, but in reality, i really like where the car is right now. Its super quick and it feels like it shouldve when it came from factory. I had higher expectations for the SR injectors but i guess u can only go so far

[Jookmasta]

BTW, i forgot to add in that around 3500 and only around 3500, i get a spike in the A/F to like 14 or so but it then quickly drops down to eleven's and twelves. we couldnt rectify that issue after about eleven street pulls. o ya, and all of this took place in 3rd gear..........

[PalmerWMD]

Your car sounds fast and well tuned..

Any times or good kills lately?

Fred..

[:: orion ::]

What boost were you at?

And have you hardwired the fuel pump?

Asking just to make sure it's not shoddy fuel pressure, instead of maxed injectors.

- Brian

[Craving4Boost]

which SR injectors are you referring too? 370's? just making sure

[s86d]

What boost were you at?

And have you hardwired the fuel pump?

Asking just to make sure it's not shoddy fuel pressure, instead of maxed injectors.

- Brian

If you are referring to the bosch 30amp relay that I have heard so much about. Please do an install/picture hosting so many ka-t people wont lean out after 5700rpm. (including me) -Dave

[DRIFTEADOR]

http://www.ka-t.org/tech/

last article

[GEO]

jook you got aim? Send me a IM at ge0man

[Jookmasta]

my pump is fully hardwired in with no relays or anything like that. im using a z32 tt fuel pump fyi.............im gonna get a fuel pressure gauge installed within the next two weeks so i shouldnt better be able to judge this issue when i see what my fuel pressure is........

[Jookmasta]

o ya, im running eleven pounds. as for the latest kills, i havent really ran into anything since i fixed the boost leak and since the tuning. The previous kills with the boost leak and boost coming on at 4500 rpms (nine psi) and in fourth gear include:ford lightning350zrx8mazdaspeed protegea bunch of mahatma ricecivic with delsol vtec engine.......acura TLacura TSX

[redss]

o ya, im running eleven pounds. as for the latest kills, i havent really ran into anything since i fixed the boost leak and since the tuning. The previous kills with the boost leak and boost coming on at 4500 rpms (nine psi) and in fourth gear include:ford lightning350zrx8mazdaspeed protegea bunch of mahatma ricecivic with delsol vtec engine.......acura TLacura TSX

I have the same problem with it Spiking up to 13 AFR at around 4000 to 5000 rpm. The power drops off a bit also as the car gets warm. When it is warm, I see my AFC showing 1 to 2 knock at idle. I have been messing with the fuel pressure. It seems help a bit with the spiking as I turn the pressure up.

[Jookmasta]

interesting. im thinking that messing with the fuel pressure would help with that spike but won't be able to do that until i get an FPR. I would love to hear from other peeps running these SR injectors and to see what boost level and a/f's your achieving.

[DRIFTEADOR]

anyone else think injectors should be rated based on tq not hp? it is at peak tq where you need most fuel, not necessarily horsepower. I don't know why you're leaning out at 3500rpm jook, i wouldn't think peak tq is that low even for a t3, but it sure sounds like thats resss' problem.

[Chezedik]

jook, what kind of numbers have you gotten from the T3, any internal engine work?

[Jookmasta]

no internal engine work. bone stock internals. I will be posting up numbers of the setup on sat cuz thats dyno day for me!!!!!!!!!!!!!! yay!

[Chezedik]

What is your setup? I imagine mine is going to be similar. TB03 turbo (300zx) , 24 inch intercooler, MBC 12psi, JWT ECU, Top feed 550cc inj (RX-7), HKS recirc valve, SAFC, Z32 MAF, Megan FPR, AEM UEGO Wideband. Something like that?

[Jookmasta]

My setup:

Str8 T3Custom Log ManifoldSR 370cc Injectors300zx TT fuel pumpJoe P MBCFMIC BRM 3" Catback exhaust2.5" DPGreddy Type S BOV

[GEO]

and the numbers?

[WDRacing]

I've seen a steady 15 psi running 370's on a actual 180 in Japan. He drove it everyday like that. He also had the SAFC but he had a FPR to turn the base pressure up.

Get a FPR and gauge and you'll be able to extend the HP limits of any injector. Not to mention the injector will fire a better pattern at the lower duty cycle with more fuel pressure.

WD

[Jookmasta]

what size turbo was this on WD? and after rereading ur post, i can say that i learn something new everyday.

[WDRacing]

I think it was a GT2835R if I remember correctly.

[Chezedik]

Jook, when do we get #s

[redss]

interesting. im thinking that messing with the fuel pressure would help with that spike but won't be able to do that until i get an FPR. I would love to hear from other peeps running these SR injectors and to see what boost level and a/f's your achieving.

I added 2 psi to the base fuel pressure. It did more for the fuel curve than adding + correction on the SAFC2. I think another psi will do it for me and I can lower the correction back down on top. I am doing 10.5 to 10.8 AFR from 6000+ RPM to redline. I hit 7 to 8 psi of boost with an occasional creep to 11 psi on 1st and 2nd gear.

[Jookmasta]

nice, well the aeromotive fpr is next up on the list then. We will see if i can squeeze it in b/f i leave for school. also, numbers have been posted in another thread.

[Chezedik]

what thread? Do you have a link?

[Jookmasta]

zerothread?id=123971

[Chezedik]

YES, that is exactly what I NEED my setup to be, where did you get your exhaust mani?

[Jookmasta]

its a jgs log mani

[DRIFTEADOR]

I am doing 10.5 to 10.8 AFR from 6000+ RPM to redline. I hit 7 to 8 psi of boost with an occasional creep to 11 psi on 1st and 2nd gear.

that's because there is less fuel being injected at that high rpm than at say 4000rpm. a lot of people assume high rpm=more fuel and thats not the case.

[Chezedik]

First thing, who is JGS? Secondly, How can it be possible that you do not use more fuel at higher RPMs. I understand that you will lean out at high Rs due to wide duration cam profiles, but you are still turning more rotations, and you have to keep it running. So I guess what I am saying is, please explain.