How big is too big?

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bad360rt
MS/Extra Newbie
Posts: 3
Joined: Thu Apr 06, 2006 10:52 am

How big is too big?

Post by bad360rt »

I'm looking to run MS for fuel only on my blown '02 Dakota 5.9 R/T. My last dyno was 592rwhp 547rwtq. Based off of ~20% drivetrain loss and using the injector calculation with .60 bsfc and 85% dc, I'm looking at needing 63lb injectors to support the power I'm making now. Of course with plans for future growth I would like to only buy injectors once. My question is how big is too big? Can I run 72lb injectors and still be able to trim them enough at idle and part throttle? What about 75lb or even 83lb injectors? Thanks for the help!

I'm looking forward to my MS install and tuning, I can't wait to finally have full control over my fuel curve :D
'02 Dakota 5.9 R/T
592rwhp 547rwtq
Clifton
Helpful MS/Extra'er
Posts: 49
Joined: Tue Aug 02, 2005 8:25 am

Post by Clifton »

I know I need to run a 72 lb injector. The 550's I have now are maxed with the stock piggy backed ecu. How can you tell if it will be too much at idle if I haven't set up the MSII yet? It is 180ci 6 cyl.
bad360rt
MS/Extra Newbie
Posts: 3
Joined: Thu Apr 06, 2006 10:52 am

Post by bad360rt »

Thanks Lance. Looks like I'll be going with the MS-II :D Since my truck is already EFI, everything else is already in place, and I've already upgraded to a full return fuel setup, just need to be able to run big injectors and control them and I didn't want to fork over $3K for the standalones that are available. Hopefully I'll be posting in the success stories section in about a month, until then it's more :RTFM:

-Dave
'02 Dakota 5.9 R/T
592rwhp 547rwtq
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