GTP Injectors LT1 Install

[Injuneer]

That's what I thought. The later non-S/C 3.8's were rated at 3.5 bar = 50.75 PSI. Wasn't sure if S/C was the same. Based on 3.5 bar vs. 3.0 bar (43.5 PSI) the conversion would be 33.3 #/HR.

[superspirit]

I DO NOT recommend running without clips! When I bought my LT1 the injectors were installed without clips, 1500 miles later I started smelling fuel I stopped and looked and the #8 injector had come out of the rail far enough to spray fuel all over the engine compartment and firewall. It was a very scary situation as I was taking my little girl to school when this happened. there are ways to modify the injectors so they can be retained. I HIGHLY recommend going this route!

[95Hawk326]

I DO NOT recommend running without clips! When I bought my LT1 the injectors were installed without clips, 1500 miles later I started smelling fuel I stopped and looked and the #8 injector had come out of the rail far enough to spray fuel all over the engine compartment and firewall. It was a very scary situation as I was taking my little girl to school when this happened. there are ways to modify the injectors so they can be retained. I HIGHLY recommend going this route!

Any pics of the injector mods?

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[superspirit]

No I dont have any pics, but I got a set of modified injectors from fuel injection connection and they worked great.
If you are a patient person you could mark the new injectors for the clip and take a hacksaw blade and carefully make a retainer clip groove.
take a look here https://fuelinjectorconnection.com/c...l-injector-set

[SSlowBoat]

Any pics of the injector mods?

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you just take a hack saw blade and make the 1 groove that doesn't go all the way around go all the way around. takes 10 mins. that's it.

also there are 2 different part numbers for gtp injectors, one flows 33lb and other 35.99lb so I set injector constant to 34.5lb

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[Catmaigne]

There's the 811 (all plastic) and 737 injectors (plastic with metal bottom). They always seem to run best around the high 33lb/low 34 lb range but I wouldn't worry about the constant that much. Tweak it until the BLMs are centered on 128.

I've had good luck with with doubling up on o-rings to keep the injectors from pushing out of the rails. There's a groove directly above where the lower o-ring sits that you can add another onto. It will prevent the injector from moving too deep into the intake boss because the groove ID is larger.

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[SSlowBoat]

There's the 811 (all plastic) and 737 injectors (plastic with metal bottom). They always seem to run best around the high 33lb/low 34 lb range but I wouldn't worry about the constant that much. Tweak it until the BLMs are centered on 128.

I've had good luck with with doubling up on o-rings to keep the injectors from pushing out of the rails. There's a groove directly above where the lower o-ring sits that you can add another onto. It will prevent the injector from moving too deep into the intake boss because the groove ID is larger.

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the o ring will dry out and break causing it to slide down. I've personally had it happen. I strongly suggest against this

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[BALLSS]

you could add a wider OD (with same ID as the 811 upper slot) O ring in the upper groove that may help. These pencil injectors are narrower that the stock ones

[SSlowBoat]

you could add a wider OD (with same ID as the 811 upper slot) O ring in the upper groove that may help. These pencil injectors are narrower that the stock ones

43.5psig behind a uncontained o ring is spelling disaster. scariest moment of my life was #7 spraying on my hot idling motor and header by doing that.

op, I'll get you a pic Sunday when I go to my car for its monthly startup of how to do it right

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[Catmaigne]

Never had a viton Felpro o-ring dry out and break before, they're tough as hell and hard enough just to get on. If you really want to be anal you could pop a metal E clip above it in the lower groove.

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