I just wanted to get a definitive word on this because I'm finally going to the shop tomorrow to talk to the guy who did my rebuild and put TII injectors in the secodaries. I have only ridden in two other 7's and I don't think either of them are really right; therefore, I really have no basis of comparison of how my car should run. I know the after 5k my car seems to run rough. Not every time, but it definitely doesn't pull much after 3800 like the way I understand that its supposed to. Is ANYONE using TII injectors in their secondaries or know someone who needs them. The guy who did my rebuild said that my streetport is bigger than most, whatever that means. He said I have like 220 hp which I also doubt. Anyways, let me know what you guys think.

 

Well, I noticed in your sig that you are not running any engine management. unless you are running a piggy back, or a stand alone computer, you won't ever be able to run tii injectors right. You'll run way too rich. Drop a couple hundred for a S-AFC and some dyno time, and you will be fine. Someday, you may actually need the injectors if you ever plan on more power or FI.

 

Not unless you have a power adder of some sort, and/or a way to control the injectors.

 

C'mon guys, at least vote if you're not going to post!

 

The only time you need t2 injectors is if you have a car capable or making power, like a t2, or maybe a bridgeport.

 

Check out this site, its helpful when determining fuel needs- here

 

With your current setup, I'd bet my *** you don't need them.

 

NA injectors can flow enough fuel to support ~250hp. No NA is going to get near that without being bridgeported.
With your mods I doubt you'll have much over 200hp, and if you're running those Turbo injectors without any form of control you'll actually be loosing power from overly rich mixtures. That's why it doesn't pull well after 3800rpm (when the secondaries come on).

BTW, polls are for getting people's opinions, not for discussing technical facts.

 

Apprarently, people disagree over this issue; therefore, they possess OPINIONS and vote on this poll.

My mechanic still maintained that I need my TII injectors today. He replaced another sensor and said that the hesitation is fixed. I'm going to pick the car up in a few minutes and will post again tonight with the results.

 

Get him to clearly explain why, because I think his asnswer will prove either he doesn't know what he's talking about or he's trying to rip you off. Ask him how the ECU will compensate for the fact that it's injecting ~10% more fuel than it should be.

Have a read of this thread on the same topic.

 

I answered yes, because I thought you were just asking if a NA would ever need TII injectors.

But, for your setup, you do not need the TII secondaries.

 

NO N/A engine will ever need TII secondaries. Even with a large street port. Now, bridge port or PP'd engines might, but normal engines won't.
Now, keep in mind that a turbo engine putting out 200 hp will need more fuel than an N/A motor putting out the same amount of power. This is due to the fact that the TII motors are more prone to detonation, mostly due to the heated intake air.

Also, the issue of managment comes up. Your car is running too rich and loosing power right now, since the ECU thinks the factory injectors are in place.
Man.... on my heavily ported N/A engine with every single mod and everything bolted on and ported, I gained power by leaning out the fuel with my S-AFC another 10% at least!!!!!!!!!

 

If you super charged a N/A using the no longer in production Paxton kit you needed to upgrade secondaries if you weren't completely stock.

 

NO N/A engine will ever need TII secondaries. Even with a large street port. Now, bridge port or PP'd engines might, but normal engines won't.
Now, keep in mind that a turbo engine putting out 200 hp will need more fuel than an N/A motor putting out the same amount of power. This is due to the fact that the TII motors are more prone to detonation, mostly due to the heated intake air.

Also, the issue of managment comes up. Your car is running too rich and loosing power right now, since the ECU thinks the factory injectors are in place.
Man.... on my heavily ported N/A engine with every single mod and everything bolted on and ported, I gained power by leaning out the fuel with my S-AFC another 10% at least!!!!!!!!!

I personally would love to talk to your mechanic.... He is 100% wrong.

 

Ahh.. no heated intake air here...

I leaned my old n/a out up to 15% when i had s-afc and true duals, made more power.

And tell me about power loss due to richness, running 10 to 1 afrs under boost over 6psi heh, major power loss.

 

Keep your A/F ratio around 13.5/1 .... Mine was higher like 13.8-14.00 flat and made best power but I detonated on the highway. Thinsg like wind resistence ( load ) and road/tire resistance are not acounted for.

Might of been dirt from my forced air hose thou and my timing was really advanced as well as using cheap 711 gas so mabey that was it. But definatly 14/1 a/f ratio for astreetported engine is best power wise.

 

Really big mistake. I ran on a complete set of turbo II injectors for a few months on my 88 gxl. The car got like 8 miles to the gallon. And huge power loss