Do I need to get bigger injectors?
 

I recently installed dual walbro intank pumps and my presure it sitting at 70lbs. Just wondering if its time to put pull the 26lb injectors and put in SVO 30lb injectors? Mods are as follows.

99 T/A MTI stage II heads, C2 cam, MTI programing, slp headers, Ls6 intake, Ported TB, FTRA, pulley, best so far 11.62 @ 118 TNT Kit - no times yet.

Re: Do I need to get bigger injectors?
 

ttt ????

Re: Do I need to get bigger injectors?
 

ttt 4-u

Re: Do I need to get bigger injectors?
 

I think I'm in a similar boat. I logged some runs last night and calculated >90% duty cycle.
<img border="0" alt="[shoot]" title="" src="graemlins/gr_guns.gif" /> 26lb

Have you logged your injector pulse widths?

Re: Do I need to get bigger injectors?
 

The smaller 26lb OEM injectors are on the small side for heads and cam, and if it were me I'd consider getting some 30lb injectors... I'd get Delphi, Bosch or Siemens before I'd get SVO's... Delphi's tend to have the best reputation out there.

Re: Do I need to get bigger injectors?
 

I am in the same boat as you, I have MTI S2 heads, C2 cam, LS6 intake, Mac headers and MTI LS1Edit tuning and I logged a pulse width of 23mS @ 6400 rpms, that works out to a duty cycle of 122% <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> My next mod will be new injectors about 42 lb/hr @ 58 psi.

Re: Do I need to get bigger injectors?
 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Kylekay:
<strong> I am in the same boat as you, I have MTI S2 heads, C2 cam, LS6 intake, Mac headers and MTI LS1Edit tuning and I logged a pulse width of 23mS @ 6400 rpms, that works out to a duty cycle of 122% <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> My next mod will be new injectors about 42 lb/hr @ 58 psi. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Does your engine cutout/pop like you are hitting the rev limiter (but not as bad) when the injectors are operating at this level?

Thanks

John

Re: Do I need to get bigger injectors?
 

Not yet, but they are not designed to work at is level and will not last long. MTI said I'm not lean at top RPM so the injectors are handling it for now, however I have read that the injectors become inefficient over 100% dc.I have had a loss of power, (over time), that I am trying to fix, may be related but I think its probably the Mac cats.

<small>[ March 26, 2003, 05:03 PM: Message edited by: Kylekay ]</small>

Re: Do I need to get bigger injectors?
 

PSJ, I thought Bosch = SVO. No?

Re: Do I need to get bigger injectors?
 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Murdock:
<strong> PSJ, I thought Bosch = SVO. No? </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">You are correct. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

-Andrew

Re: Do I need to get bigger injectors?
 

Kylekay, just to let you know the injectors cant physically run more than 100 percent dc thats impossible. In fact your not supposed to run them over 80% If you are seeing 120 percent duty cycles then thats what the computer is commanding so you really need at least 20 percent more injector, but in reality you would want about 40% more. Of course this assumes you did the math correctly.

Gary