LS4 TB Vs. LSJ TB for Supercharged 2.2 - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 12 (permalink) Old 07-25-2010, 07:04 PM Thread Starter
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LS4 TB Vs. LSJ TB for Supercharged 2.2

So the s/c kit I am buying has a M62 supercharger ported to accept a ported LS4 throttle body.

My question is should I look for a LSJ TB and resale the LS4?

The car I am s/c is my daily (in my sig) and would like the ride the be as smooth as can be. I've heard that the LS4 can make the ride really rough. Any thoughts or insight would be appreciated.

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post #2 of 12 (permalink) Old 07-25-2010, 08:51 PM
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id say port the lsj throttle body, but everyone has their own opinions between the lsj tb and the ls4.
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post #3 of 12 (permalink) Old 07-25-2010, 10:43 PM
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The LS4 TB is about 7mm larger than the LSJ one and gives you more power and torque on the bottom end and a slight bit more boost at low RPMs. It doesn't really do much once you get in the higher RPM levels.

The reason why the ride is 'rough' on the LS4 TB is primarily due to it having a very quick throttle response.

You will need to tune your G5 specifically for it... so make sure to tell that to whoever is tuning you.


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post #4 of 12 (permalink) Old 07-26-2010, 08:44 AM
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i wouldnt run it, im using the LSJ TB plus the L61 TB bolts are good enough to hold in the LSJ TB to the SC so you dont have to buy any more bolts. the LS4 you might need longer bolts???

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post #5 of 12 (permalink) Old 07-26-2010, 10:39 PM
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Quote:
Originally Posted by cobalt123 View Post
i wouldnt run it, im using the LSJ TB plus the L61 TB bolts are good enough to hold in the LSJ TB to the SC so you dont have to buy any more bolts. the LS4 you might need longer bolts???
LS4 TB needs an adapter plate.


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post #6 of 12 (permalink) Old 07-27-2010, 09:07 PM Thread Starter
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Quote:
Originally Posted by Nighthawk243 View Post
LS4 TB needs an adapter plate.
have it.

So if I swap TB's w/ an LSJ, then would I need a different blower due to mine being ported to accept the LS4 TB?
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post #7 of 12 (permalink) Old 07-28-2010, 06:13 AM
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Why would you need a different blower? The LSJ is the stock throttle body...it should mat up to the M62 inlet just fine...you said it was the LS4 that needs the adapter plate...so since your not going to use it I don't see the issue of using the stock TB that came with it.

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post #8 of 12 (permalink) Old 07-28-2010, 08:22 AM Thread Starter
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Quote:
Originally Posted by bluegtp91 View Post
Why would you need a different blower? The LSJ is the stock throttle body...it should mat up to the M62 inlet just fine...you said it was the LS4 that needs the adapter plate...so since your not going to use it I don't see the issue of using the stock TB that came with it.
makes since.
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post #9 of 12 (permalink) Old 07-29-2010, 08:14 PM
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You shouldn't need a new blower if you wanted to use the regular TB.


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post #10 of 12 (permalink) Old 07-29-2010, 08:20 PM
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just make sure you have the right TB.meaning pin count.

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