just throw a set of the 350.00 injectors from DW im geting 650cc

 

Well the 380s are actually more like 412s...Denso underrates their injectors. D3510Z just tuned his car to 450/450 before the injectors maxed. That was at 9.5 PSI I believe..He is using a Utec...

 

My injectors were at 99.5 % duty cycle at 9.5 psi with the U-tec.. and with a perfect tune it will be fine, Also I ve heard from users using the bigger injectors with the tn kit have had problems stalling just at idle..... scary ****.... kcobean told me about it.
But for low to mid 400's You will be fine!!!
Stick with the 380 injectors!

 

Stalling huh yah thats what i was worried about

 

Exactly

 

I guess ill be the one testing this theory then

 

Your car will not stall with 440cc injectors. Greddy includes them in their turbo kits, and the engines do not stall. Some cars are unique, but the vast majority do not stall.

 

Sharif i actually have 650cc i was just worrying about the idle but im sure i can get it to work when i throw her back on the dyno

 

The VQ35 idles very low from the factory, ufortuantely. With my ECU set to 1000rpm idle, I am running 650cc injectors and it idles perfectly at 1000rpm...very steady and never stalls.

We've done 9 cars with return fuel systems, 440cc injectors or larger, and tuning. None of them stalled, except for Kelly's. I havent checked back with him lately, to see if the idle air learning procedure worked for him.

 

Right thats what i was going to do on my SR20 had to run 1200rpm idle with 96lb

 

I have 650CC's trimmed via the UTEC and my car idles rock steady at 750rpms with a perfect 14.7 A/F ratio..At 530WHP were seeing 80% duty cycle, and would never opt to tune my injectors to 99% duty cycle, thats just insane and asking for problems..My old APS injectors maxed out a 470whp and were well over 94% IDC and impossible to control at that point..We were running 58psi of idle fuel pressure.

 

ya i'm running 650's too, and with my own mods got the car idling rock steady at 875, never stalls, and perfect a/f (14.7-15) cold and hot starts are just like factory with no throttle blips or anything. turn the key and go.
99.5% duty cycle is not good at all. did you figure in your altitude? hope you were at sea level on a cold day!!

 

+1 Dense cold air makes the most difference in A/F and boost pressure..If he is not at sealevel and has 99% IDC and goes to sea level and makes just 1 additional psi, KABOOB...Playing with fire man,were warning you..

 

another thing to keep in mind too is how the injector signal is manipulated by cutting the injector signal. depending on how it is cut, you will not get correct duty cycle readings. best to do the calculations on projected hp, rpm, and go with industry standard 43psi fuel pressure and 80% duty cycle. then decide what injector you need.

 

+1..But no one ever listens to what they dont want to hear..We will be reading "another blown motor" thread in a month or two if he runs his injectors at 99% duty cycle...

 

I know that with the Turbonetics reflash, the car is set to idle at 900-1000rpms. Was this addressed after he had his ECU reflashed to stock?

 

Not true. A guy I know who races professionaly has run his PETT 350z with the 380cc denso core injectors at 450+whp on a weekly basis in race conditions. He has never had a problem with them. Anyway, at 400whp they shouldn't be at 99% duty cycle.

 

I can not see a pro dragracer running 380cc injectors near their maximum duty cycle...Whats is his name?
I know you dont want to hear it, but do the math...380cc's are not operating at a "SAFE and RELIABLE" injector duty cycle at 450hp...I would not do it in MY car or a customers car...

 

Not drag racing. Anyway, I'm not here for a pissing match.

I just hate to see someone waste money on 440cc injectors when he doesn't need them. If anything, he should wait for the TN stage 1.5 kit with 510cc injectors, or else buy some 550s.

 

ok guys what duty cycled will i run with 400 rwhp?