Biggest DBC Throttle Body?

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Dec 3, 2025 | 12:36 AM

DualQuadDave

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Biggest DBC Throttle Body?

Hi, anyone know where I can find a bigger than 102mm DBC throttle body? I did see Wilson has one, but the price on that is silly. Would like a 105mm or bigger. LMK if someone has a secret source. Thanks!

Dec 3, 2025 | 03:20 PM

LS1 TJ

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So no disrespect but what is your engine combo that requires a TB bigger than a 102? Just asking.

Dec 3, 2025 | 05:03 PM

5.7stroker

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From: OH

I ran into something similar when considering the BTR Trinity intake.
I wonder if BTR talked to Nick Williams when they designed their trinity intake for a $700 Nick Williams 103mm TB.
I'll probably just try a 103mm to 90mm adapter so that I can just run my LS3 12605109 DBW TB. I think Soler Performance makes one or the Holley 2704 adapter may work.

Dec 3, 2025 | 06:53 PM

FCar2000TA

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Have you already increased the plumbing in front of the throttle body? For example, a 4" MAF housing is 100mm. Add air straightener and it is about 98mm. If you are using a MAF and air straightener, you actually need 105mm MAF housing and plumbing for the throttle body to actually get 102mm of air.

Dec 3, 2025 | 07:57 PM

Keith

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From: Mefis

This is a start:

https://www.holley.com/products/fuel.../parts/112-581

Dec 3, 2025 | 10:33 PM

FCar2000TA

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Quote:

Originally Posted by Keith

This is a start:

https://www.holley.com/products/fuel.../parts/112-581

Checking the existing plumbing in front of the throttle body is the starting point. Even a 200mm throttle body won't do **** if the incoming airflow is not the correct size.

Dec 3, 2025 | 11:09 PM

DualQuadDave

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Quote:

Originally Posted by LS1 TJ

So no disrespect but what is your engine combo that requires a TB bigger than a 102? Just asking.

Hi TJ, it's a 392ci 4.155x3.622. It's getting Brodix BR1's and either a Summit Big Gun 1 or 2 for the initial startup. Still undecided on intake, having some firewall clearance issues,(71 Javelin) but I think I may have a couple solutions. I need to buy a DBC throttle body for this and I'm going as big as possible since this is getting turned up 8000rpm and I hate spending money twice. May slap a much bigger motor in it later too.

For those asking on the inlet tract, I currently have nothing, but I'm def planning on a 5in tune setup.