stock pcm 96# injectors
04-04-2007, 07:45 AM
#61
TECH Resident
iTrader: (17)
Join Date: Sep 2004
Location: NC - Charlotte area
Posts: 3,747
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Jammer
Any more input here... would some of us be better with 83lbers.. what are the effects of the rich idle... any work arounds??? I have the versafueler and am about to order injectors.
04-04-2007, 10:34 AM
#62
its not the box you use, its the injector, they are big and slow and move a bunch of fuel even when open for the shortest time possible ~2ms
keep turning down your fuel pressure until you can run at or over 2ms.. thats it. if you can't do it then you need to move back to a smaller injector w/ more pressure, or something fancy like staged injectors.
you can also have the injector open earlier or close later (offset) and spray the valves to lean the idle out, but you are not actually moving a smaller volume of fuel... just spraying it at the wrong time to get the pulsewidth up to a stable range @2ms
keep turning down your fuel pressure until you can run at or over 2ms.. thats it. if you can't do it then you need to move back to a smaller injector w/ more pressure, or something fancy like staged injectors.
you can also have the injector open earlier or close later (offset) and spray the valves to lean the idle out, but you are not actually moving a smaller volume of fuel... just spraying it at the wrong time to get the pulsewidth up to a stable range @2ms
04-04-2007, 12:02 PM
#64
A lot of injectors have a minimum pulsewidth of 1.0 ms. I can run my 60# mototrons down into the 1.2 ms area before it starts to get really sloppy. If I had a low impedence injector driver it would be a bit nicer to control at the lower areas but you still have that physical minimum pulsewidth limitation to contend with.
Last edited by NicD; 04-04-2007 at 12:09 PM.
certainly not precise repeatable amounts required for a stable idle
04-04-2007, 02:26 PM
#66
Originally Posted by NicD
A lot of injectors have a minimum pulsewidth of 1.0 ms. I can run my 60# mototrons down into the 1.2 ms area before it starts to get really sloppy.
boy i remember way back in the day when i got those funny looking black injectors in the mail from ws6rufus i think his name was on here... far as i know i was the first with a set installed and running on an ls.
04-04-2007, 08:07 PM
#67
Originally Posted by Jimmy P
What brand of 96# injectors have you guys had good results with? What do you think of injectors from Precision? Search function isn't working....
Im running them with Harlans driver box.
98 PCM w/ HP tuners and the MAF-T Pro Piggy Back
Precision 96#ers
32 psi base FP.
900 rpm idle...
14.7:1 afr @ cruise and idle....
no stutter or stumble going from cruise to WOT or the other way around....
Harlan did the tuning....
Kyle
04-09-2007, 11:43 PM
#68
Staging Lane
Join Date: Aug 2006
Posts: 81
Likes: 0
Received 0 Likes
on
0 Posts
If you have the software updates for the HPT you can now do real time tuning as well if you have a Tuner that has educated himself on what tables and how to use the updates. I am sure there is someone on LS! Tech that has all this information.I am also debating on 96# and versafueler on stock PCM or going all the way with BS3.
04-10-2007, 10:33 AM
#69
Launching!
Join Date: May 2005
Posts: 210
Likes: 0
Received 0 Likes
on
0 Posts
FWIW with my 96's/BS3 setup, i can get idle to run 14.7:1 - but any cruise rpm-closed throttle (high vacuum, low kpa) scenario makes the car run rich as hell, even with a '1' in the appropriate fueling cell. Maybe i missed something but I always understood big injectors to have a propensity to slobber...
04-15-2007, 12:36 PM
#71
this worked well for me so far..96# versafueler
efilive:
on small pulse adjuster you can enter a MINUS number..-.3 to -.4 worked wonders
In the IFR table, at idle and cruise/high vacuum areas, i entered the injectors as 100#..not 96.
efilive:
on small pulse adjuster you can enter a MINUS number..-.3 to -.4 worked wonders
In the IFR table, at idle and cruise/high vacuum areas, i entered the injectors as 100#..not 96.
04-20-2007, 03:29 PM
#72
I just switch to 96's and a versafueller today.Ended up with fuel pressure at 45lbs -boost reference only and set injector scale to high 80's swing. Had it at 96 but it was pushing my VE table high so I just lowered the IFR which brought it in line.
Truck idles at 900rpm and A/F at 15-1 no problem.It was leaner at first but I had to richen it up. I see no problems.Did no changes at all with the injector pulse widths.Drives perfect just like the 60's did.
Truck idles at 900rpm and A/F at 15-1 no problem.It was leaner at first but I had to richen it up. I see no problems.Did no changes at all with the injector pulse widths.Drives perfect just like the 60's did.
04-25-2007, 11:25 AM
#73
8 Second Club
iTrader: (18)
Join Date: Oct 2002
Location: Waterloo, Ontario
Posts: 2,609
Likes: 0
Received 0 Likes
on
0 Posts
So could these be used for a daily driver? I've just heard too many tuners say they don't like the driver boxes-they either work or leave you stranded-anyone have anymore input on these?
05-07-2007, 03:29 PM
#74
TECH Junkie
iTrader: (10)
Join Date: Nov 2002
Location: Deerfield Beach, FL
Posts: 3,672
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Jammer
Installing versa and 96" next week..allow 2-3 weeks for a tune... unless it snows..then it'll be a while so better grab a snickers.
Versa are $399.
Versa are $399.
05-07-2007, 10:19 PM
#77
Originally Posted by eb02z06
So could these be used for a daily driver? I've just heard too many tuners say they don't like the driver boxes-they either work or leave you stranded-anyone have anymore input on these?
05-08-2007, 01:07 PM
#78
8 Second Club
iTrader: (18)
Join Date: Oct 2002
Location: Waterloo, Ontario
Posts: 2,609
Likes: 0
Received 0 Likes
on
0 Posts
I just ordered RC72's hi's but after the feedback I got I'm going to send them back and get a driver box and some injectors. I can get either the 86lb Seiman Deka's or the 86lb holley/msd's from Racetronix(therelocal so i can get them next day). Which ones should I get?
http://www.racetronix.com/3105FM.html
http://www.racetronix.com/17113744FM.html
http://www.racetronix.com/3105FM.html
http://www.racetronix.com/17113744FM.html
05-18-2007, 10:20 AM
#79
Launching!
iTrader: (17)
Join Date: May 2006
Location: MN
Posts: 278
Likes: 0
Received 0 Likes
on
0 Posts
Kinda off topic but it seems you guys with 96lbs injectors are running low duty cycle. Why not try something a little smaller and turn up dc? Just curious.
NAST-TA what kinda gas millage do you get cruising with your setup? Or any of you with these 96lbs injectors
Good info though keep it up guys..
NAST-TA what kinda gas millage do you get cruising with your setup? Or any of you with these 96lbs injectors
Good info though keep it up guys..
