TBSS intake on gen III 4.8 5.3 6.0

[RAMurphy]

So on Tuesday the fuel rail I ordered (12621662) was delivered. It did not work. After deeper research I found the correct fuel rail. If you want to use the fuel injectors (OEM 2002 Tahoe Flex Fuel - my Tahoe) which I do, then this is the wrong fuel rail. The correct fuel rail for my application is 12660709. It was delivered today and I verified the fit with a spare flex fuel injector I had on hand.

Below is the picture of the fuel rail and then the fuel rail on the manifold. The red circle is where the two fuel rails are different. The correct one for my build the keeper for the top part of the injector is a little bit longer to accommodate the OEM flex fuel injectors.

 

[RAMurphy]

My solution to the C5 corvette fuel filter and routing of the fuel lines.

 

[RAMurphy]

Just received my BBP tune for the TBSS upgrade. Looking forward in installing this in the next couple of weeks.

 

[RAMurphy]

Going to try to get the TBSS installed this weekend.

 

[RAMurphy]

Looks like tomorrow is the day I install the TBSS.

 

[RAMurphy]

I got started old intake off. Starting on putting the pieces together on the TBSS. Here the fuel rail is installed with injectors on the TBSS.

 

[RAMurphy]

Completed the TBSS install. Not quite as simple as the multiple you tube posts out there but not that difficult. After install, I needed to reroute some wires and get creative on how I mounted some of the cable brackets on top of the TBSS manifold. I also needed to fix a minor fuel leak but she started right up. Idle was off for about 30-90 seconds but the computer corrected that issue. Disappointed that I was not able to use the Vortec cover, but I haven't given up on that just yet. I can be pretty creative. I still need to record some data for BBP to get the final tune but she runs great. My initial opinion is that I feel that I don't need to step on it as much to get the same result - but when I do really step on it "WOW". Definitely worth the upgrade.

 

[RAMurphy]

I would not recommend the Holley 90mm throttle body. I'm having a significant noise issue with the Holley throttle body. I have what I would describe as a "whistle" when I first start up the Tahoe. When it warms up it goes away to the point I can't hear it from the driver's seat. However, open the hood and you can hear it. It gets more pronounced under slight throttle. But under mid to full throttle - nothing. My first thought was vacuum leak, but i confirmed it was not (plus BBP saw my data and there is no vacuum leak that the data shows. Plus I ran a scan and all is good). I took the cold air intake off - wow you can hear it. It is coming from the IAC ports. Put your finger slightly over the hole and it goes away. Did some research, wished I did it before I bought it, and this seems to be a known issue with this throttle body. So I talked to Jared from Texas Speed and he confirmed that this was an issue with this particular throttle body. I ended up going with his recommendation and buying a FAST throttle body.

 

[Mudsport96]

Yeah i have found many threads on that. I had considered the tbss intake in the past, but for the wife (tahoe) and daughter ( Silverado) neither of them need them really. And last thing i need is one of them saying the engine sounds funny and it be the throttle body lol.

 

[RAMurphy]

Received my FAST throttle body. First thing when opening the shipping box I pulled out a case. My first thought was they shipped the wrong product. But then I realized the TB was shipped in this case. The other obvious thing when opening the case was the quality of this TB. I was so much superior to the Holley TB. This thing was obviously built with quality. After looking it over, I was pretty confident tis was would not give me the same problems. The IAS port was much much bigger. Installed it and started up the Tahoe and no whistle or unwanted noise whatsoever. I do have one problem, not unexpected, is how to mount it to my cold air intake system. It is 92mm vice the 90mm and that causes me some fitment issues that I will overcome.

 

[Mudsport96]

If you have a local hardware store, get a 3.5 inch rubber pipe coupler. 90mm is roughly 3.5 inches and 92 is roughly 3.6, should work.

 

[RAMurphy]

If you have a local hardware store, get a 3.5 inch rubber pipe coupler. 90mm is roughly 3.5 inches and 92 is roughly 3.6, should work.

Thanks for the suggestion, I essentially did something very similar to get my baby on the road before my specialized adapter is delivered.

 

[Mudsport96]

Thanks for the suggestion, I essentially did something very similar to get my baby on the road before my specialized adapter is delivered.

Ive used all sorts of hillbilly stuff for intake piping.
Wish i had a picture of my old S Blazers setup, a k&n for a 3.8 ford and since it had a metal base i welded that to a 3 inch turbo downpipe, then used a 1 liter mountain dew bottle with the ends cut off to tie it to the maf and throttle body hat.....it was ugly. Guy that owned the dyno shop took one look and said "really? "
But was impressed in the long run that the old 4.3 made what it did. For being a 4.3 anyway.

 

[iamdub]

Ive used all sorts of hillbilly stuff for intake piping.
Wish i had a picture of my old S Blazers setup, a k&n for a 3.8 ford and since it had a metal base i welded that to a 3 inch turbo downpipe, then used a 1 liter mountain dew bottle with the ends cut off to tie it to the maf and throttle body hat.....it was ugly. Guy that owned the dyno shop took one look and said "really? "
But was impressed in the long run that the old 4.3 made what it did. For being a 4.3 anyway.

LOL at dynoing a 4.3.

 

[Mudsport96]

LOL at dynoing a 4.3.

In 6 cyl bog class only the guy with the supercharged 3.0 ranger could beat me. 4.0 rangers, 4.2 jeeps, 4.9 f150s and 5.9 cummins' all fell to the tiny 4.3. Lotta work done to the 60e and some to the engine. But that is off topic.

 

[iamdub]

In 6 cyl bog class only the guy with the supercharged 3.0 ranger could beat me. 4.0 rangers, 4.2 jeeps, 4.9 f150s and 5.9 cummins' all fell to the tiny 4.3. Lotta work done to the 60e and some to the engine. But that is off topic.

I've played with a few over the years- TBI and CMPFI. Had a supercharger on my '02 Xtreme. I LOL'ed when thinking of all we did back in those days to squeeze ponies outta them 3/4 tree-fiddys. I dyno'ed my boosted X... Was really underwhelmed.

 

[RAMurphy]

I received the parts I needed to install my cold air intake system to my FAST throttle body the correct way. So glad to get rid of my shi%$# temporary fix.

 

[RAMurphy]

Don't believe what you see on you tube or other posts, you can get the original engine cover to fit.

 

[2000chevy]

Some trick i learned in my instrallation of a TBSS on my 2002. I found that the cross over tube from a 2004 flex fuel Tahoe fits over the TBSS and allowed me to keep the stock fuel rail and return fuel line. The Flex Fuel Injectors are also taller than the stock injectors that helps in this clearance.View attachment 381983
Pre 2003 Drive By Wire throttle bodies do not need the xlink. I just had to re-pin the connector that came with the 87mm TBSS throttle body. The original TB 8 pin connector uses separate 5 volt and grounds for throttle position sensor where the TBSS TB only has a 6 pin connector that shares the 5 volt and ground.

Any way you might have a part # for this crossover tube? I have a TBSS intake that didn't come with rails so this would be awesome considering I have a spare set of return style rails that already have 8.1 marine injectors with them.

 

[Mrwick_02]

My solution to the C5 corvette fuel filter and routing of the fuel lines.
View attachment 383686

What fittings/line did you use? I would like to do that also.