LSJ LS4 Throttle Body

8

12568580 $229.99
Regular price $229.99

By feeding your blower with a TB that is 7.6mm larger than stock, parasitic loss is reduced, HP is increased, throttle response is dramatic. The stock TB is 67.4mm and the stock blower opening is 70.5mm. The LS4 TB is 75mm.

Modification (Porting) to the blower inlet is required or the larger throttle plate will contact the blower and not allow full opening, If you are not planning on porting the inlet of your blower, you will need this throttle body adapter/spacer plate. Since the inlet of this throttle body is larger than stock, you will also need a larger LS4 silicone coupler.

To see full gains, you would want to port the entire inlet of the supercharger.

The increase in throttle response is very dramatic, we only recommend adding this product after you have a full stage 3 kit, header/downpipe, dual pass endplate, and cams/valve springs.

**PCM calibration required. In HPT under engine idle airflow the ETC area scaler is normally 2950 (this works out to throttle plate area in millimeters less the rod area).

67.4 dia, pi*r2 = 3568 less throttle rod area (620) = 2948

75 dia, pi*r2 = 4418 less throttle rod area (730) = 3688

You'll need to change the 2950 to 3688. Many users have reported better results going even higher. We have tested numbers ranging from 3775 to 5500 without issue.

By feeding your blower with a TB that is 7.6mm larger than stock, parasitic loss is reduced, HP is increased, throttle response is dramatic. The stock TB is 67.4mm and the stock blower opening is 70.5mm. The LS4 TB is 75mm.

Modification (Porting) to the blower inlet is required or the larger throttle plate will contact the blower and not allow full opening, If you are not planning on porting the inlet of your blower, you will need this throttle body adapter/spacer plate. Since the inlet of this throttle body is larger than stock, you will also need a larger LS4 silicone coupler.

To see full gains, you would want to port the entire inlet of the supercharger.

The increase in throttle response is very dramatic, we only recommend adding this product after you have a full stage 3 kit, header/downpipe, dual pass endplate, and cams/valve springs.

**PCM calibration required. In HPT under engine idle airflow the ETC area scaler is normally 2950 (this works out to throttle plate area in millimeters less the rod area).

67.4 dia, pi*r2 = 3568 less throttle rod area (620) = 2948

75 dia, pi*r2 = 4418 less throttle rod area (730) = 3688

You'll need to change the 2950 to 3688. Many users have reported better results going even higher. We have tested numbers ranging from 3775 to 5500 without issue.

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Ecotec

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4.9 Based on 8 reviews
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LS
02/03/2018
Lee S.

LS4 Throttle Body

Bigger is better :grin:

SM
08/13/2017
Scott M.

Excellent product. Fits just like

Excellent product. Fits just like it should.

BW
05/21/2017
Brad W.

Ls4 throttle body

Product works exactly as I hoped it would

NC
04/05/2017
Nathan C.

Amazing quality

The responsiveness is incredible and we are seeing impressive gains on the dyno with the ported s/c. Send me a window decal so I can promote zzp at our local meets here in south FL. Thanks everyone at zzp keep up the great work.

OA
11/24/2015
Octavio A.

Brand new! love it!

It is so sensitive! Big difference in take off!