22# injectors
Thread Starter
Drifting
Joined: Jun 2013
Posts: 1,590
Likes: 60
From: ft myers FL/Munising MI
22# injectors
I've had this discussed a little before, but just went over with the local custom corvette guy..builds/races them, who going to do some work on my 85, which is stock...when fic told me to get 22#at 43-5 lbs rather than the stock 24's., it generated two phone calls back to jon regarding this....even vetteoz, who's obviously really up on it, says they're ok if jon says....well, local guy can't understand why they are 22#...says they'll probably have to be tuned to 100%....I already installed them in the new manifold/rails i'm putting in... he says since it's getting dyno'd, bigger the better...not a fuel inj guy...i'll bite for new ones if that's better....just would like a few suggestions...not building a racecar,just getting a valve job, roller rockers, headers and installing stock intake runners, tb, plennum all chrome...removing the air/egr of course. just for driving around....will 22# do????? thanks...Paul 
Drifting
Joined: Aug 2010
Posts: 1,704
Likes: 8
85 is a one year car,one year ECM,one year MAF module,one year 24 injectors,one year forged piston....Stock one year 24 lb injectors work at a low fuel pressure than next year 86 22 lb.They work at 38 PSI .Probably the flow rate with bigger #24 at a low pressure it's the same flow rate at 43 pSI with smaller 22 lb.
Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
The stock Bosch 280-150-233's for 85 flowed 248 cc (24 is 252), and Jon has Bosch blue 280-155-715 256 cc that make a great 85 replacement.
http://www.witchhunter.com/flowdatapix/b0280155715.jpg
If you installed Bosch yellow 280-155-700 these aren't even 22. I got a call from a guy in NC last week that installed these in an 89, but his blm counts were way lean up at 150 to 160 (160 is adding as much fuel as the ecm can). I programmed him a chip at 20 lbs, and got a call back that it runs much better.
Do not settle for these 700's if that's what you've installed, period. Get the 715's and be done with it. I wrote to Jon about this, but got no response from him.
http://www.witchhunter.com/flowdatapix/b0280155700.jpg
http://www.witchhunter.com/flowdatapix/b0280155715.jpg
If you installed Bosch yellow 280-155-700 these aren't even 22. I got a call from a guy in NC last week that installed these in an 89, but his blm counts were way lean up at 150 to 160 (160 is adding as much fuel as the ecm can). I programmed him a chip at 20 lbs, and got a call back that it runs much better.
Do not settle for these 700's if that's what you've installed, period. Get the 715's and be done with it. I wrote to Jon about this, but got no response from him.
http://www.witchhunter.com/flowdatapix/b0280155700.jpg
Last edited by MrWillys; Nov 2, 2013 at 06:04 PM.
Race Director
Joined: Sep 2003
Posts: 16,836
Likes: 337
From: Database Error Indiana
No way 22s will be at 100% duty cycle on a stock motor. You should be able to bump up the fuel pressure to get the flow you need. I ran my 87 on E85 with 24s. Yes it was all they could handle but they did it and ran 12.80 at 110 mph.
Thread Starter
Drifting
Joined: Jun 2013
Posts: 1,590
Likes: 60
From: ft myers FL/Munising MI
The stock Bosch 280-150-233's for 85 flowed 248 cc (24 is 252), and Jon has Bosch blue 280-155-715 256 cc that make a great 85 replacement.
http://www.witchhunter.com/flowdatapix/b0280155715.jpg
If you installed Bosch yellow 280-155-700 these aren't even 22. I got a call from a guy in NC last week that installed these in an 89, but his blm counts were way lean up at 150 to 160 (160 is adding as much fuel as the ecm can). I programmed him a chip at 20 lbs, and got a call back that it runs much better.
Do not settle for these 700's if that's what you've installed, period. Get the 715's and be done with it. I wrote to Jon about this, but got no response from him.
http://www.witchhunter.com/flowdatapix/b0280155700.jpg
http://www.witchhunter.com/flowdatapix/b0280155715.jpg
If you installed Bosch yellow 280-155-700 these aren't even 22. I got a call from a guy in NC last week that installed these in an 89, but his blm counts were way lean up at 150 to 160 (160 is adding as much fuel as the ecm can). I programmed him a chip at 20 lbs, and got a call back that it runs much better.
Do not settle for these 700's if that's what you've installed, period. Get the 715's and be done with it. I wrote to Jon about this, but got no response from him.
http://www.witchhunter.com/flowdatapix/b0280155700.jpg
Thread Starter
Drifting
Joined: Jun 2013
Posts: 1,590
Likes: 60
From: ft myers FL/Munising MI
