I showed the guy what I had, and he recognized them right off as Pontiac Grand Prix Supercharger injectors. He even quoted the PNs stamped in the side of them by memory. The auction was for 10-36lb Bosch injectors even though all I needed was 8. Without having them tested though, I had no clue if there was 10 in the set because 2 were known to be bad. So I decided it was worth taking the time to drive across town to have him at least run them on the bench. The short story is all 10 are dead-on.
Here's a pic of the results of the first 8:
This was after about 30 seconds of 50% duty cycle run I believe. He said these are absolutely perfect. And at 1st glance, the lines looked perfectly flat across the row. But looking closer, I noticed that #2 and #3 were slightly lower than the others. He said relatively speaking, that's minuscule and easily ignored. Specs require that the injectors be within 5% of target. These are less than 1% of target. The other two injectors were just as close.
He said the whole concept of "flow matched" is from the older style pintle injectors. The older style EV1 style (fat-body) injectors were the ones that needed flow matching...bad. He said he's taken brand new sets of the fat-body injectors, and they would be all over the place with levels recognizably different from across the room and still technically in spec. So when racing, you really benefit from paying for flow-matched sets of those. But with Bosch's ability to get this level of reliability and accuracy from their injectors, you no longer need to worry about flow-matching. You get the accuracy of flow-matched sets on stock engines today.
I've got a video of the spray pattern, but it's a bit large to post. It looks pretty much just like all their other videos they have posted on their website. In the video you can't tell, but some sprayed straighter than others. He said there were no issues that would bother him or lead him to believe that one injector was better than another. Satisfied no serious servicing is needed, he runs lube through the injectors, replaced the upper O-rings on all of the injectors, capped the ends, bagged them for me, and sent me on my way.
He did say if I ever "outgrow" these injectors, he can re-drill these injectors to be 50-55lb injectors, which is cheaper than a new set of 55-60lb Bosch injectors. He also said the 19lb injectors I have on my stock Explorer engine now are actually 22lb injectors when run at 43.5PSI and can be drilled to flow as 36s...same as the injectors I had tested. All-n-all, he said unless I ever decide to build some seriously boosted setup, the injectors I have on hand should work for me for anything I ever want to build.
Anyway, since he took time on a Saturday morning to test my injectors, talk to me, and let me get some pics and video, I promised him I'd give him a plug here on the site. So if you ever need some injector service, give them a call:
Fuel Injector Connection
770-888-1662
info@fuelinjectorconnection.com
