kogelch

The truck in my sig injector duty cycle is 100% at approx 80-90% TPS. I need upgraded injectors but I was thinking used injectors cost $250, I might as well upgrade everything and do a nnbs intake with stock injectors for close to the same price but a little more work. I found an 07 e85 Tahoe intake manifold with stock fuel rails and stock injectors (injector part #12594512). Im looking for some experience or oppinions. What makes more sense for the long run. Upgrade my stock injectors to 8.1 marine multech injectors. Or upgrade to 07 intake manifold. And if i upgrade to 07 intake setup will the stock injectors be enough for my engine. Any oppinions or advice would be helpful. I know the nnbs intake manifold is returnless and takes some work to make it function correctly.

omc8

iTrader: (7)

Well your drive by cable correct. Never considered this swap. If you were drive by wire you would need a X-link. Advantage of the New style intake it flows better, stainless rails and go up to a least 90mm tb or more. As far as the E85 injectors I think their around 32 lb IIRC. Don't know if that will get you where you want to be or not. What tb were you planing on using ?

kogelch

I've found adapter plates they make so I can bolt my stock 3 bolt cable drive TB on the nnbs 4 bolt drive by wire tb intake mounting pattern which would make the install easier. But will I be maxing out my stock TB. Ive read about many of these swaps but I'm holding back because I don't want to spend $300 for this nnbs setup if I will jus have to turn around and buy bigger injectors. It might be better to just buy the larger injectors for my stock intake manifold. Unless the nnbs is worth the work. I'm not sure how happy people who do this swap are or what kind of gains they see. I know I have to change my fuel system to return less and am not sure what else I will run into along the way.

omc8

iTrader: (7)

What size is your old TB , 78mm and how much are the adapter plates. The biggest negative with this plan is that you would not be taking advantage of 90mm throat which this intake is designed for.

kogelch

Id like to upgrade the TB with it. But im still seaching and learning what fits my 1999. Supposidly theres a Dr. X adapter that turns my cable drive / non DBW vehicle to a non cable / DBW. But im still reading. Any insight would be helpful if anyone knows. Id like to get a NNBS intake manifold with a 90 mm cable drive or DBW TB. I just need to find some more info. My idea was, get a NNBS intake manifold. Get it on my truck and everything working with my TB by using an adapter plate. Then go from there and finish with a TB upgrade. But if i could kill 2 birds itd be nice to do both at the same time. I found an 07 intake with a DBW 90mm TB but i can find the DR.X adapter. I'm still trying to find out if the adapter works on my 99. Any advice? Thanks for all the help so far.

batboy

iTrader: (6)

If the 07 injectors are flex fuel, you should be fine. If you decide to do the manifold swap, won't a Nick Williams cable driven 90mm throttle body work?

kogelch

The injectors are flex fuel injectors. Do you by chance know what type connectors the e85's are. I'd like to get the correct connector adapter before I get it so I do t have to splice all the injector connectors. I did find a 90mm cable drive TB on summit racing that should work fine. Now all I need to figure out is the injector connectors and return less fuel setup.

omc8

iTrader: (7)

Cost wise staying cable will be easiest on your wallet. All you will need is the TB , you can probably go up to a 92mm Nick Williams. If you go dbw you will need a 03 to 07 harness , TAC , pedal and the X- link . The X-link alone is around $240.

batboy

iTrader: (6)

I don't know for sure about the injector connectors. The gen III 5.3 in my 06 Tahoe has flex fuel injectors and I think they use the same connector. But, the 07 5.3 might be gen IV, so I don't know about them.

kogelch

If im looking to do this upgrade does anyone know or have experience or an oppinion on what manifold would be best to upgrade to. What year truck am i looking for to get a manifold off of. I plan to use a 90mm cable drive TB and build some stuff to make the returnless fuel system work. And advice would be helpful. Thanks

99Bluz28

iTrader: (35)

Id upgrade the injectors first.

omc8

iTrader: (7)

Couple guys on PT forum have said that the TBSS and the NNBS intakes are different but its not true they are the same. It does not matter which truck as long as its new body style. Here is a list , as you can see its quite expansive. TBSS Style intake manifold is on the following vehicles
4.8L
2007–present Chevrolet Silverado 1500
2007–present Chevrolet Tahoe
2007–present GMC Sierra 1500
2007–present GMC Yukon

5.3L
2004–2009 Chevrolet TrailBlazer including EXT (through 2006)
2005–2009 GMC Envoy Denali
2005–2006 GMC Envoy XL
2005 GMC Envoy XUV
2005–2007 Buick Rainier
2005–2009 Saab 9-7X
2007 Chevrolet Silverado 1500
2007 GMC Sierra 1500
2007–present Chevrolet Avalanche
2007–present Chevrolet Silverado 1500
2007–present Chevrolet Suburban 1/2 ton
2007–present Chevrolet Tahoe
2007–present GMC Sierra 1500
2007–present GMC Yukon
2007–present GMC Yukon XL 1/2 ton
2008–present Hummer H3 Alpha
2009–present Chevrolet Colorado/GMC Canyon

6.0L
2006-2009 Chevrolet Trailblazer SS

kogelch

Thanks for all the help guys.

468BIGBLOCK

iTrader: (4)

I will be keeping up with this swap.

91FormulaKiller

iTrader: (28)

just throwing this out there for ya, i have a set of 8 inj's of a 2011 LC9 5.3 with 20K miles on them, like new. PM me if your interested.

DSRE

iTrader: (7)

This is a great swap for the trucks, but I wouldn't run a 76mm tb definitely upgrade to the 90mm cable or 87mm dbw it offers huge throttle response over the 76 and the flex fuel injectors are 39lbs at 4 bar I made 460rwhp in my 383ls 06 4x4 silverado with stock flex fuels, the tbss injectors also work at 32lbs for most hci 5.3-6.0 setups
I have a complete tbss/nnbs intake with tb dr x link all sensors, injectors, lines rails literally ready to bolt on for sale pm me if anyone is interested.

kendogg

iTrader: (2)

Can somebody help me see whats different about the newer manifold? It outflows the old truck intake? Would it be beneficial for a towing/low end torque application??