I'm trying to sell the TPI setup that I bought a couple of months ago (sold my RS so I don't need it anymore). The guy I bought it from didn't know what car/engine that the setup came off of. I don't even know if the setup was pieced together or if it all came from the same car. In one of my TPI swapper's guide books it talked about a code stamped on the fuel rail could identify it. I checked the fuel rail and found a code and looked it up, and I believe it came from a '91 305. Is there anyway to tell what size injectors I have from looking at the pics below? Should there be a code or something on them that would tell me? Lastly, were 305 and 350 throttle bodies the same? If not, can mine be identified in the pics or can someone tell me how I can tell? Thanks.

 

Looks JUST like my 92 305 TPI setup, if that helps. I'm no technician, so I can't help with the rest.

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90 Wrangler with 305 TPI motor out of 92 Firebird Formula/ SM465 tranny/ Scout Dana44's on 35" BFG's

 

Well, I know that it is a '90-92 speed density TPI setup. I just don't know what size the injectors are. Thanks though.

 

Find the numbers on the injectors and call Rich at Cruzinperformance.com. He is an injector expert and should be able to help you out.

And you are correct...that is a '90-'92 speed density TPI. The "short" fins on the plenum and the MAP sensor bracket on the passenger side of the plenum indicate that.

 

there is a # on the top of the thick part of the injector, look it up in a chiltons or haynes manuel or get the numbers and call your local dealership and have them run the # that will tell you for shure.

They do look like 24 pounders from a lt1.
but I have never seen the stock injectors on a TPI.

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97 formula w/6speed,cags skipshift eleminator, hurst billet pro shifter, 30#injectors,adjustiable fuel presure regulator,Moroso cold air induction,ported mass air sensor,accell300+ ignition box, accell 9000 wires, bosch platnum4 plugs,flomaster crossflow muffler,Lingenfiter 52mm throttle body,TPIS L98 SuperProfile cam,Crane 1:6 full roller rockers,Edelbrock subframe connectors,Edelbrock strut tower brace.

Other car is a 89 GTA w/700r4w/stage 2 shift kit, corvette servo, B&M mega shifter, TPIS bigmouth intake, TPIS large tube runners, TPIS 52mm throttle body,Edelbrock ported centerbolt heads,LT1 24# injectors,GMPP LT4 hotcam,CompCams Pro magnum roller rockers,Edelbrock headers, flowmaster crossflow muffler,MSD 6A, accell coil, bosch platnum plugs, this car is currently under rebuild and restoration.

 

Those ar 19lb./hr. they're gray the 22Lb./hr. injectors for 91 are black.

 

Thanks for the tips. I'll check them for numbers/codes tonight.

evilho7810 - thanks for the info, that would certainly support my theory that they came out of a '91 305.

 

Well, I called Cruzin Performance and got some answers. I checked the injectors last night and they had 17086545 stamped on them. The guy at Cruzin told me they should be gray (they are, I didn't tell him this) and that they are 22lb injectors. I looked up the number on the fuel rail again in my book and I was wrong, I had been looking at the wrong number. The number on mine wasn't in the book, and the book didn't list numbers for '92 so I'm thinking the entire setup came off of a '92 350.

 

My 91 350 injectors were black and 22lb./hr. Sorry.

 

Well my '91 350 injectors are gray. Can someone please shed some light on this? If the owner before me put 19 lbs injectors on my car then I'll be pissed.

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1991 Z28 - 350 TPI, T56, McLeod street clutch, LT4 pressure plate, Pro 5.0 shifter, ported plenum & runners, AFPR, Holley Annihilator ignition box and wires, Hooker shorty headers w/o AIR, Flowmaster muffler, homeade ram-air, SSM subframe connectors, Kenny Brown STB, Global West steering box brace, Steve Spohn adjustable torque arm and T56 crossmember

 

FWIW, my '95 vintage 24lb injectors are gray. I'd go with the numbers, it seems that would be more accurate than their color.

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Mike

'90 IROC-Z , 5-speed, ZZ4, G1 Trick Flows
Moderator SEThirdgen