Help: Fuel Injectors
Thread Starter
Racer
Joined: Feb 2006
Posts: 480
Likes: 3
From: Buffalo Grove IL
Help: Fuel Injectors
Hi all
I have a stock 1985 coupe with the L98 350 engine.
I am having some issues with a couple of my injectors. If I take them out and hit on table, then put back my engine runs great. But soon after they clog up again.
So its time to change them.
I have a stock fuel system. So what size should I use? 22lbs?
How big can I go? Will going bigger help performance or just run richer?
Any one have any suggestions on brand?
Thanks
Dave
I have a stock 1985 coupe with the L98 350 engine.
I am having some issues with a couple of my injectors. If I take them out and hit on table, then put back my engine runs great. But soon after they clog up again.
So its time to change them.
I have a stock fuel system. So what size should I use? 22lbs?
How big can I go? Will going bigger help performance or just run richer?
Any one have any suggestions on brand?
Thanks
Dave
Oil Producer
Joined: Apr 2014
Posts: 9,363
Likes: 2,734
hahaha. its a party with the 85's today. i just ordered a new set of injectors from john at fuel injector connection. here is a link to what you need to buy.
https://fuelinjectorconnection.com/c...esign-iii-24lb
when you fill out the order form, its asks you for your Chevrolet/Corvette/1985
he needs that to make them the right height.
there are vids on youtube that shows you the process. cheers. VT.
https://fuelinjectorconnection.com/c...esign-iii-24lb
when you fill out the order form, its asks you for your Chevrolet/Corvette/1985
he needs that to make them the right height.
there are vids on youtube that shows you the process. cheers. VT.
Hi all
I have a stock 1985 coupe with the L98 350 engine.
I am having some issues with a couple of my injectors. If I take them out and hit on table, then put back my engine runs great. But soon after they clog up again.
So its time to change them.
I have a stock fuel system. So what size should I use? 22lbs?
How big can I go? Will going bigger help performance or just run richer?
Any one have any suggestions on brand?
Thanks
Dave
I have a stock 1985 coupe with the L98 350 engine.
I am having some issues with a couple of my injectors. If I take them out and hit on table, then put back my engine runs great. But soon after they clog up again.
So its time to change them.
I have a stock fuel system. So what size should I use? 22lbs?
How big can I go? Will going bigger help performance or just run richer?
Any one have any suggestions on brand?
Thanks
Dave
Race Director
Joined: Aug 2000
Posts: 11,470
Likes: 763
get yourself a set of bosch3's from Jon at FIC. good upgrade over original, first generation bosch injectors. BTW, originals are 24# and QUIT BANGING THEM ON THE TABLE! 
bigger injectors is like over-carbing an engine - no performance gain, in fact, you may see a decrease in performance. stay with the stock sizing on a stock engine.
stock, iron head 85, you want 24# - no more, no less -
bigger injectors is like over-carbing an engine - no performance gain, in fact, you may see a decrease in performance. stay with the stock sizing on a stock engine.
stock, iron head 85, you want 24# - no more, no less -
Last edited by Joe C; Oct 2, 2016 at 08:18 AM.
Supporting Vendor
Joined: Mar 2008
Posts: 1,762
Likes: 14
From: Cumming Ga
We have a sale going on today for the whole site. Enter "tgifriday" and get 10% off your order at www.fuelinjectorconnection.com!
Melting Slicks
Joined: Nov 2013
Posts: 3,451
Likes: 336
From: Greater Cincinnati Area.
85 vette here too. I got my bosch III from FIC also. Totally happy with them.
The delivery rating is different from stock because of the pressures they are calculated at, IIRC. 22# VS 24# or something? I've slept since then, but I know there was a difference.
Call them and they will get you the right set.
The delivery rating is different from stock because of the pressures they are calculated at, IIRC. 22# VS 24# or something? I've slept since then, but I know there was a difference.
Call them and they will get you the right set.
Last edited by confab; Sep 23, 2016 at 03:33 PM.
Advanced
Joined: Jul 2016
Posts: 79
Likes: 1
From: milwaukee wi
ide go with FIC!! i didnt but thats because i didnt need new ones but they were very helpfull.
I upped my injector #/hr and it was perfectly fine.. but ide buy stock.. theres really no reason to up your injectors unless your upping consumption..
You can always test yours by putting a stethascope on the injector and if you dont hear the "ticking" while runnning/cranking they arent working.
Also, maybe disconnect your fuel rail and key on your engine.. make sure your not getting debris in your fuel line thats clogging your injectors.. you dont wanna clog up your new set once you get it.
I upped my injector #/hr and it was perfectly fine.. but ide buy stock.. theres really no reason to up your injectors unless your upping consumption..
You can always test yours by putting a stethascope on the injector and if you dont hear the "ticking" while runnning/cranking they arent working.
Also, maybe disconnect your fuel rail and key on your engine.. make sure your not getting debris in your fuel line thats clogging your injectors.. you dont wanna clog up your new set once you get it.
Last edited by tomcamaro97; Sep 23, 2016 at 05:27 PM.
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Racer
Joined: Mar 2013
Posts: 462
Likes: 98
For what its worth, and I know this is controversial, I went with the Delphi OEM fuel injectors for my 1990 recently. The original factory injectors lasted 26 years and 90K miles, and the existing system, computer, PROM, exhaust, and so on were designed to use them. Aftermarket injectors may have the same pounds rating, but a different curve ("transfer function") than the OEMs. Probably not a big deal, but again, the car was designed to run with the OEMs, why not just use those? My two cents, and I've been very happy since doing the replacement on my 90.
Team Owner
Joined: Jul 2004
Posts: 28,372
Likes: 3,259
From: Hartford WI
Hi all
I have a stock 1985 coupe with the L98 350 engine.
I am having some issues with a couple of my injectors. If I take them out and hit on table, then put back my engine runs great. But soon after they clog up again.
So its time to change them.
I have a stock fuel system. So what size should I use? 22lbs?
How big can I go? Will going bigger help performance or just run richer?
Any one have any suggestions on brand?
Thanks
Dave
I have a stock 1985 coupe with the L98 350 engine.
I am having some issues with a couple of my injectors. If I take them out and hit on table, then put back my engine runs great. But soon after they clog up again.
So its time to change them.
I have a stock fuel system. So what size should I use? 22lbs?
How big can I go? Will going bigger help performance or just run richer?
Any one have any suggestions on brand?
Thanks
Dave
You can go bigger but it won't help. ECM will see it and dial the pulse width back down. Stock replacement from FIC will help. Generally, I would say a pound or two at stock pressure won't make a difference but if I put in my 42pph injectors in your car, I promise you it will flood since you don't have the adjustment in the ECM.
Give Jon a call and he will help you select what is best unless you have a tuner that set your ECM for something different. After which, I'd send it out every few years for cleaning and testing.
Team Owner
Joined: Jul 2004
Posts: 28,372
Likes: 3,259
From: Hartford WI
For what its worth, and I know this is controversial, I went with the Delphi OEM fuel injectors for my 1990 recently. The original factory injectors lasted 26 years and 90K miles, and the existing system, computer, PROM, exhaust, and so on were designed to use them.
Aftermarket injectors may have the same pounds rating, but a different curve ("transfer function") than the OEMs. Probably not a big deal, but again, the car was designed to run with the OEMs, why not just use those? My two cents, and I've been very happy since doing the replacement on my 90.
Aftermarket injectors may have the same pounds rating, but a different curve ("transfer function") than the OEMs. Probably not a big deal, but again, the car was designed to run with the OEMs, why not just use those? My two cents, and I've been very happy since doing the replacement on my 90.
I'm not sure how different the curve can be when you have a set poundage, pressure and pulse width but the ECM can adapt unless it gets too radical so why pay more for OEM?