BBK Throttle Body upgrade - Opinions?

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Jun 3, 2020 | 11:19 AM

ggabesz

Thread Starter

Cruising

Joined: Jun 2020

Posts: 11

Likes: 0

BBK Throttle Body upgrade - Opinions?

Dear C4 Fans!

First post here, sorry for the not so exciting topic

Do you have any experice with this throttle body? Is it worth purchasing?

Million Thanks!

Jun 3, 2020 | 11:57 AM

fredk

Burning Brakes

Joined: May 2005

Posts: 921

Likes: 57

From: Muskoka Ontario

Not without mods, make sure you put your cars year down for answers.

Jun 3, 2020 | 12:07 PM

vette196

Melting Slicks

Joined: Feb 2015

Posts: 2,069

Likes: 262

From: Park Ridge New Jersey

Stock 48 mm will be fine up to 400 hp (maybe 500, i forgot)

Jun 3, 2020 | 12:10 PM

ggabesz

Thread Starter

Cruising

Joined: Jun 2020

Posts: 11

Likes: 0

Sure! It is a '93-er with automatic...

Jun 3, 2020 | 07:53 PM

aklim

Team Owner

Joined: Jul 2004

Posts: 28,501

Likes: 3,302

From: Hartford WI

Quote:

Originally Posted by ggabesz

Sure! It is a '93-er with automatic...

What are you hoping to get out of it? What need do you think it will satsify?

Jun 3, 2020 | 08:03 PM

Kevova

Le Mans Master

Joined: Sep 2013

Posts: 6,192

Likes: 750

From: near the thumb in the mitten

IMO not the first mod more towards the last. There will be some tuning required for the increased air flow particularly low speeds... ie...stop and go traffic.

Jun 3, 2020 | 08:56 PM

grandspt

Drifting

Joined: Jul 2004

Posts: 1,359

Likes: 292

From: MA

Quote:

Originally Posted by ggabesz

Dear C4 Fans!

First post here, sorry for the not so exciting topic

Do you have any experice with this throttle body? Is it worth purchasing?

Million Thanks!

Don't waste your time and money unless you have other mods that will allow the engine to breathe better.
I have the 52mm BBK with a medium sized cam, headers, ported intake, and 3"dual exhaust and x pipe.
The BBK does not run well right out of the box for an LTx engine. Expect hesitation off idle, low idle and sometimes high idle (intermittently). IAC Counts will be all over the place. One of the problems is that the IAC circuit is completely different from the stock 48mm. BBK also doesn't center the throttle plates in the bores properly which causes the throttle to stick. This requires loosening the plate screws and centering the plates in the bores properly so they won't bind anymore.
I did quite a bit of machine work to my BBK to mimick the stock 48mm TB IAC circuit. It works well now but it required several modifications to perform correctly.
Be warned

Jun 3, 2020 | 09:17 PM

aklim

Team Owner

Joined: Jul 2004

Posts: 28,501

Likes: 3,302

From: Hartford WI

IDK about the BBK unit. I did have someone with an LT1 that we switched back and forth doing a blind test at the strip, IOW he didn't know which run was with the stock unit or the Accel unit. He actually went slower with the 58mm one. I briefly installed the ACCEL one on a stock car and it didn't really do much as far as idling went. BBK might be different.