hey guys,

I just found out some disturbing information,
and I wanna know something. ill keep it short

I have a 89 TPI car, did a swap with a car (1988 L98 TPI)
had it rebuilt, yada yada..

now heres the question. I currently have the 85-88 cold start TPI .. and I HAD 89-92. until ..

the dude that did the swap with me sold the late model Tuned Port, and Im stuck with the older stuff.

what are the differences between the 2 in performance and
drivability?

Im upset, because that was potentional money or spare
equipment for my car.

that and I didnt want the 9th (cold start) injector.
Is there a way to bypass this. It doesnt belong in the car,
so can I remove it and plug the fuel rail?


and the wiring harness was designed for the 89-92 setup,
I have a few sensors wires left over.

so there are multiple concerns .. but not too big

oh I forgot, both are MAF setups


thanks

 

why not just leave it? if your computer is still an 89 computer the 9th injector will just sit there.

 

Actually, the '89 TPIs had no cold start injector, and thus used the later style intake and plenum/runners. '86, '87, and '88 were the same, but different than the '89 in that they used a cold start. '90 and up were not MAF equipped (speed/density). '85 used the same intake and cold start as the '86 & '87, but used a different MAF and different wire harness.

Other than the lack of a cold start injector on the '89, operational differences between the '88 and '89 are negligible.

Which ECM and PROM are you using?

 

If it is really just going to bug the **** out of you, Remove it from the back of the fuel rail, take the rail to a plumbing store, and find a suitable cap. Seal the cap with a sealant that tolerates gas/alcohol and high temps. Then find a 89 and up base, or maybe find a way to plug the hole in the base.

Or.... (What I'd do....)

...just avoid all that, leave it sit there and tell ***** guys that TPI developes such huge intake pressures that GM HAD NO CHOICE but to install a factory intake blow off valve... then go on and on and getting an adjustable computer for it so you can control it from the dash, and put a boost gauge in the car, but wire it in line with the tach signal. Tell them the hard line is to vent back into the intake, as to not cause unwanted blow off "ppsssst" sounds into the open engine bay.

(PS - I'm a cruel sick twisted Son Of Ah ..... Priest)

 

lmao


Vader, the car is a 89 5.7L T/A ..wiring is factory
the ECM and memcal are stock
not sure of the ID numbers ..

I want to off the 9th injector because it is ugly
and there would be no purpose.

but I dont want the trouble of plugging the hole on the runner and intake if I can just leave it on.


my stance is leavin' it ..
unless Vader says something cool

not that your idea wasn't GOY !!

 

My problem is that it seems you can't get the 9th injector any more, so I'll probably upgrade to the parts from a 1989 system down the road that omit that injector.

Currently it's just disconnected.

 

There's several companies that make cold start injector block off kits that include two pieces. One piece to block off the hole in the base of the runner, and a cap nut type fitting to block off the hole in the end of the fuel rail. You can go this route, or just make your own block off kit, which is what I did, and it wasn't too difficult. I just cut a piece of about 1/16" steel to the right size and rounded the edges with a grinder, then drilled a 3/8" hole in it for the runner bolt to use as a block off plate for the runner. Just use some rtv to seal it to the runner, or cut out a piece of gasket material. Then for the fitting at the back of the fuel rail, I used a small tap, can't remember the exact thread size, and tapped threads into the small hole that the injector tube goes through, and used a small hex headed set screw with some pipe thread sealant on it to plug the hole in the fitting. Another option is to pick up an 89-92 style fuel rail to use in place of the one you have now. I'm now in the process of upgrading to the newer style plenum, runners, fuel rail, and tb, but blocking off the ninth injector stuff using the above mentioned methods should work out fine for you if you don't want to spend the money changing to the newer stuff. Of course you can always just leave it the way it is like the other guys said, but I did away with mine to make it a cleaner looking setup. Good luck!

 

thanks Pat and Half-Life (best game invented)

I like the procedure ya came up with pat, Im a metal worker
so I have taps, grinders, and metal. Probally the easiest way.

my main concern was if the 9th injector interfered in fuel delivery
apparently not .. im happy

also, just for knowledge purposes .. do you know who makes the cold start block off kit??

-thats pretty helpful to know if your doing a TPI swap
from an older car.

 

'bump'

 

I think street and performance carries the blockoff kit.

 

Yeah, I saw that company mentioned as carrying the kit on that website www.chevythunder.com. I've also seen one of the big name companies that carries it too. I just can't remember which one. I think it was either Accel or Edelbrock. Hey Blue, thanks for the parts! They showed up a couple of days ago and should work out great!

 

No problem. Glad to help. By the way, check your PMs.

 

great fellas,

thats the best and cleanest way to go about it.

when I get the kit, ill put it on and take some pics
so others know what it looks like on the runner.