I have a china throttle body that I’m tired of fooling with. It’s 92mm and it’s just too touchy right off idle. I’ve fooled with follower, cracker, timing…you name it. It’s basically a trade off either way I go. Car (ls1) came with a three bolt throttle body and ls6 intake. Like a fool I sold the intake. Now that I’m turboed, I could give two shots about the 10hp I gained vs the drivability. I’ve tried a nick williams too and same thing but actually it was worse. I just want to put the stock throttle body back on. I already have an ICT billet adapter but it looks to me like the air passage milled out in it, for the iac motor is a little undersized. I was going to port it so it’ll get the full flow of the iac. Has anyone done this and how did it turn out? (The tb swap with adapter).

 

In the time you typed all that you could have just installed it and seen for yourself

I’ve run them without issues but I’ve also run the big eBay throttle bodies on 4.8 and 5.3s without a problem.
the adapters are fine in my experience.

 

How is this related to Fuel and Injection, this is airflow.

 

Yea, nah.... because I'll have to retune my airflow and a host of other things that go along with it. I also have to cut the 90 degree elbow shorter because with the adapter it ends up being too long. Then I need to figure out a way to center the throttle body on my lathe and machine more of a lip in it to keep the charge pipe from blowing off. I've go through it before. Past 15-218psi it'll blow it off if I don't have more of a lip.

 

Ummm, the throttle body is part of the fuel injection system. I'll excuse you for not knowing that. Maybe I could have posted it in tuning. But i didn't see a fit. Or I could have posted it in External engine.... but I thought fuel injection would most fitting. Sorry for committing a forum sin.

And.... how is you question related to my question>? This kind of stuff is what makes forums die and runs people off because there always gotta be "that guy".

 

Calm it down, Francis. I'm the last person you want to talk like an ******* to. I'll excuse you for not knowing that as well.

I said what I said because some people in here only look in certain sections, so you might get a better answer by posting in the proper section.

Not one bit of fuel goes through the Throttle Body so I'll stand behind my statement. ​​​​​​​

Sounds like you need to get on it and make it happen instead of typing here on this Forum.

 

Calm down Karen.
actually methanol goes through the throttle body after about 17psi of boost. Does that not count? 😂

why are you “the last person I want to talk like an ******* too”? Are you a kung fu master? A triple black belt? 8ft tall and bullet proof? Just wondering if I should be scared or not. 😂😘🤪

 

I don’t have much free time right now. Here’s the situation:
my sons truck is broke. He’s using my truck, I’m driving the gto. Im currently reassembling the transmission. Im really hating life with the 92mm. Every so often, something happens where I have to turn the idle screw out 1/8 a turn because it’ll hang the tps at .04% which in turn will lock the timing at 18 degrees with no timing correction and it’ll randomly surge. Also the idle dips sometimes in parking lot maneuvers, randomly. I can’t duplicate it if I try, it just happens randomly. I just want the stock one back on. To see if it’ll clear the wonky **** up. My question was, does the stock throttle body play nice with the adapter.

I don’t have much time to be trying it, tuning it and then going back to the 92 if it ends up being worse. I have 4 transmissions to build (I’m stuck at work till 2 on a Saturday) including my sons. Plus I have a floor to fix in my house. Not enough hours in each day. Add to that, I’m slow moving right now because my back and sciatica has been hurting me. Sucks getting old.

 

From what I've seen posted here as well as my experience, the GM Throttle Bodies tend to dial in with the setup much better than the Chicom stuff.

 

I had to change it again today (running airflow) when I left work. As soon as I get some time, the china boy tb is taking a hike.

 

Get yourself an Icon throttle body and be done with it. Best TB on the market with a bunch of different attachments for different setups

 

that won’t fix all my issues. It’s too touchy right off idle too. Because I have a 3800 Convertor and a small cam, a 1-2% touch of the throttle, say while backing up, will cause a quick jump in rpm and the iac sometimes doesn’t catch it fast enough. The stock throttle body won’t allow as much air in and it’ll be more controlled right off idle. Especially because it purposely has some bumps built in to combat that.

 

I swapped from a NW 92 to a Holley Billet 92 with taper bore. The NW was really touchy off idle. The Holley is much better off idle. I suspect the Holley bigger cam lever makes the blade open slower.

 

with turbo cars there really isnt a big advantage to a huge throttle body since youre blowing through it. with your complaint of too much throttle response at low inputs, id just put a stock tb back on it. this is also why i always go dbw when given the chance.

 

yea I’ve always wanted one of those but omg. You seen the cost of them now? $763. I imagine they aren’t flying off the shelf at that ridiculous price!

 

I agree. That’s why I’m going back to stock.

 

I don't know the LIMIT of a stock 78 mm gen3 truck throttle body...
But 14 PSI can push a cubic assload of air through a 3 inch hole.

 

I haven’t done this yet, mainly due to time and I needed to machine a more pronounced lip on the flange to keep the charge pipe from blowing off. Had that issue with my china throttle body so I chucked it up in my lathe and machined it a little bit so it would have a lip. Cool thing is the 92mm throttle bodies are straight bore. Easy to just chuck up in the lathe. Well it’s not like that with a stock throttle body. Its offset, And I only have a three chuck lathe. I got creative and made a spacer for one of the legs on the chuck and offset the throttle body to compensate. Then made the lip more pronounced and tapered the inlet.



You can see in this pic that there’s a hump or taper on the bottom to tame the airflow on the initial opening.






You can see the opening is less on the bottom than the top because of the small taper on the bottom. You can also see how I tapered the leading edge. Everything adds up. LOL

 

Mine popped off a couple times at very inopportune moments (lost a no prep race) so I threw this together real quick.
it seems to work but i havent put more than 18 to it yet. its more of a support to augment the coupler than a real structural fix.

 

@Kfxguy I had the same experience with the large throttle bodies. It was super touchy off idle and felt like an ON/OFF switch. IAC whistled and could never get the startup flare well behaved. I bought a 3 bolt TB to 4 bolt intake adapter and bolted the stock 78mm truck TB back on with no tuning and my issues disappeared. Drives like stock now. Your shift tables will need adjusted. The adapter may have been the best $17 I've ever spent on eBay!