I searched all over a couple months ago before buying all the parts needed and read that stock injectors with a walbro 255 and utec under stock vortech boost would be at around 80-90% duty cycle and that there was no need for bigger injectors was the multiple consensus.

On the dyno around 5300RPM the injectors are maxing out. Is this typical? is there another UTEC setting that controls something that’s maxing them out? I never reset the factory ecu when I installed the walbro 255, should that matter since the utec takes over at boost point?

Any idea would be great.

Thanks.

~Dv8

 

Install larger injectors 440cc up.

 

Yep time to upgrade injectors, they are readily available and cheap

 

What hp/tq were you making?

440cc should work nicely for your application. I would recommend deatschwerks injectors, as they are a direct drop-in stock replacement.

In stock here: http://www.injectedperformance.com/e....aspx?ID=10467

 

Thanks everyone, i have some rc 440's that came with my kit, they said i didnt need them on stock boost but, looks like i do. Ill drop them in and go in for another tune. Ill post back the results.

~Dv8

 

Are u running the FMU or just stock injectors and walbro? If u arent running the FMU that will explain why u max out.

Also, hope u have the clips for the RC bc they wont work with the stock harness.

 

go DW Fck RC

 

x2 on the dws

 

Good to know, maybe I'll sell them and get the DW's.

Thanks.

~Dv8

 

RCs are hit or miss, if you have them already I would use them since selling RC 440's is going to be like pulling teeth.

I have RC 650's and haven't had any issues. There are lots of others using them as well.

 

Whats hit or miss about them? I'll have to buy the clips, because I don't have them. Does that mean i'll be splicing the factory harness?

Damn what a pain this has become.

~Dv8

 

RC injectors are fine. Ppl say it's hit or miss are those who go >750CC injectors and try to go big whp.

U will have to buy clips to either splice into the oem harness or u can pay more to have plug and plug with no splicing.

 

I recently sold my rc650's to MR pharmD and they worked great for me no issues at all, and I am confident he will have the same success.

RC makes a great injector as does DW, I believe it is just preference

 

add a FMU to push more fuel

 

I believe so too... that's why I bought the injectors off of ya. Thanks again for the great price . Hopefully ill have time in Dec to drop my car off to get them installed and tuned at GTM

 

This is mine. Is this the rc that need the aftermarket clip or not?

Thanks.

~Dv8

 

Yes, those are EV1 plugs and will need injector clips wired in. Stock 350z uses Nippon-Denso plugs.

 

Injector question.... even with a UTEC the factory ECU is controlling the injectors at start and idle right?

 

i believe you are correct sir. anything above 440cc , you will need to give the car some gas during warm start ups.

 

just didnt want to do anything stupid...lol I have some 420 DWs that need to be in before my retune (vortech 8psi..added test pipes and now injectors) tomorrow at 9am....!!! I better leave work early ....lol