Stock injectors +Walbro 255 + UTEC & Vortech Stock boost= 100% duty cycle?
09-15-2008, 05:07 PM
#1
Registered User
Thread Starter
iTrader: (4)
Join Date: Aug 2008
Location: NORCAL
Posts: 52
Likes: 0
Received 0 Likes
on
0 Posts
Stock injectors +Walbro 255 + UTEC & Vortech Stock boost= 100% duty cycle?
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
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
Last edited by Dv8; 09-16-2008 at 06:32 PM.
09-15-2008, 07:19 PM
#4
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
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
09-15-2008, 08:40 PM
#5
Registered User
Thread Starter
iTrader: (4)
Join Date: Aug 2008
Location: NORCAL
Posts: 52
Likes: 0
Received 0 Likes
on
0 Posts
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
~Dv8
Trending Topics
09-16-2008, 07:32 AM
#9
Registered User
Thread Starter
iTrader: (4)
Join Date: Aug 2008
Location: NORCAL
Posts: 52
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Mr_pharmD
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.
Also, hope u have the clips for the RC bc they wont work with the stock harness.
Good to know, maybe I'll sell them and get the DW's.
Thanks.
~Dv8
09-16-2008, 08:44 AM
#11
Registered User
Thread Starter
iTrader: (4)
Join Date: Aug 2008
Location: NORCAL
Posts: 52
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by SpoilsofWar
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.
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
09-16-2008, 12:52 PM
#12
Originally Posted by Dv8
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
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.
09-16-2008, 01:00 PM
#13
Registered User
iTrader: (35)
Join Date: Sep 2005
Location: Georgia
Posts: 2,071
Likes: 0
Received 0 Likes
on
0 Posts
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
RC makes a great injector as does DW, I believe it is just preference
09-16-2008, 04:13 PM
#15
Originally Posted by craigo'sznprgrs
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
RC makes a great injector as does DW, I believe it is just preference
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 
09-16-2008, 06:28 PM
#16
Registered User
Thread Starter
iTrader: (4)
Join Date: Aug 2008
Location: NORCAL
Posts: 52
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Mr_pharmD
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.
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.
This is mine. Is this the rc that need the aftermarket clip or not?
Thanks.
~Dv8
09-17-2008, 04:09 AM
#17
Registered User
Join Date: Sep 2006
Location: Oklahoma
Posts: 34
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Dv8
This is mine. Is this the rc that need the aftermarket clip or not?
Thanks.
~Dv8
Thanks.
~Dv8
Yes, those are EV1 plugs and will need injector clips wired in. Stock 350z uses Nippon-Denso plugs.
09-17-2008, 11:02 AM
#19
Originally Posted by 4SHIZZIL
Injector question.... even with a UTEC the factory ECU is controlling the injectors at start and idle right?
09-17-2008, 11:16 AM
#20
Originally Posted by Nexx
i believe you are correct sir. anything above 440cc , you will need to give the car some gas during warm start ups.