so 650cc are max out at 450 uncorrected WHP? That doesnt sound right Have you upgraded the fuel pump to Walbro 255? Those 650cc injectors should be good for a minimum of 550whp

 

gq_626, i believe we are somewhere closer to mid 500 whp. kudos setup is almost identical to ours and his dynoed @560 corrected if i remember correctly(16 pounds). we are currently running a walbro in tank with an additional aeromotive in-line. fuel pressure is about 60 at full boost(16.9).the two sub injectors are only firing at 1 percent duty. so we have a ton of fuel left to add once we replace our wastegate springs in the next few days. i will be sure to post our #s(corrected and uncorrected) once we increase our boost,hopefully about 25 pounds. i believe the turbos will peak at that boost level.hows your car ? i was sick when i saw the pictures of your accident, but im sure it will look as good as new when its fixed.-thanks jason

 

bldrz..thank for asking about the car. It's been slow, but they are doing a really prefect job on it. I think it needs about two more weeks to complete all of the repairs.

Kudos car was dynoed by SGP at near sea level, so the 560 corrected they saw was probably pretty close to an uncorrected number. That's why I was a bit concerned you were running out of injector at that level. The reason I ask is that I'm in the process of deciding on what side injectors to get...and I am vacilating between 650cc (for better drivability and ideling), and the 750cc. My goal is roughly 550whp....600whp at the absolute max. I'd like tyo keep fuel pressure no greater than 65psi under boost conditions, and about 52psi at idle.

 

GQ_626, i believe our rwh is around the mid 500 mark. that 464 rwh was an uncorrected estimate. remember a fi car at altitude(5800 feet) will still run about 6-7 tenths slower than at sea level. that would lead me to believe that a fairly large corection would be needed. same boost as kudos assuming similar fuel mapping should yield very similar numbers. i believe you are correct in that a 650 injector should make about 550 max to the wheels. depending on your timeline for the injectors i might wait and have technosquare reflash for 750 injectors. in my opinion that would be an ideal solution for a good balance between hp and driveability.(i say wait because as of our last phonecall technosquare did not have a reflash for an 04 z)-thanks jason

 

Correct, TS, can only relfash certain 04 ECU's...the older production models. Also, it's unlikely TS will ever have a reflash to 750cc. They dont even have one to 510cc. The max they are doing is 380cc, and when I talked to them on the phone, they said 380cc was as far as they could go due to technical limitations.

 

gq_626 our 650 injectors driveability is good, however we do have the occasional idle problem(stalling). we are currently trying to get the ecu to accept the idle adjustment done through consult. another option you might consider is "smaller" injectors with sub injectors run through rebic 4. we dyno tommorow, i just finished the wastegate spring install. i will post the results tom. night or wed morning.-thanks jason.

 

Has anyone added sub-injectors , if so were they placed,
in the upper plenum , between TB and plenum, ???

 

g3po, we installed 2 750 sub injectors placed after the maf and before tb.pictures to follow soon.-jason

 

also note...the eMange can also control sub injectors.

Bldr...can you raise the idle with the consult? That would solve the stalling problem...right?

 

gq, we have adjusted the idle through consult, however the adjustment is small. currently idles about 750 and the stalling is rare but still occurs. i believe we can make a further adjustment on the tb. i will let you know.-jason

 

gq i almost forgot i believe e-mange can only control one sub so if you had more than one you would need a controller, but correct me if im wrong.-thanks jason

 

Builder Z and GQ_626//

Sorry about my post - Post 24 Pounds..

I had not read this thread..

Cheers Amy -

Sound's like you are in sync...

 

bldrz I think you are right the E-manage can control 1 additional sub injector. But you have the Rebic IV.

 

bldrz:

You mentioned that you use two added sub injectors , pre-TB.

I assume you are simply bank fireing these two injectors? not independently controlling them.

Just a note to the emanage people, generally you would bank fire multiple aux injectors , so at most you would need an injector amplifier (follower) to drive multiple injectors from a single controller output (cheaper than a full controller). It may even be possible , for that single Greddy output output could drive two bridged injectors directly, I jsut don't no the specs of the output driver.

 

G3po, we are firing these injectors at pre-set boost and rpm points. thus, independent from main injectors. as we continue to increase boost i believe we may seperate the two subs to fire at diff. levels(boost and rpm). this should help to clean up the power and tq curves.

 

blrdz...right..the Greddy can only drive one sub-injector. But isn't that enough? Especially if you use a larger sub injector..like 750 or 850cc? As you mentioned, you can fire the injector at any preset points on the RPM, pressure, or MAF voltage range, and at any duration from 2ms to 20ms. Sounds like a pretty neat set-up.

 

gq, one injector may be enough. it would depend on the size of your primary inj. and your hp goals. currently with 2 large subs we have the ability to feed significantly more fuel than we need currently. however i hope we will be running both sub. inj. efficiently once we reach our target boost. a side benefit of the rebic is it allows us more tuneability. we found once we dialed in the af in 4th under high boost it was way to rich in the lower gears. primarily 1st and second. the rebic allowed us to lean out the e-manage and run the subs at a specific boost level. thanks again-jason

 

BUMP!

Apparently a white veilside widebodied Z has been spotted in boulder with an loudly noticeable psssshht sound. Any updates on the car?