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Old 12-06-2013, 12:41 AM
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Default throttle body

When should you upgrade your throttle body been searching and can't find anything on it mods...

98 ls1 383 stroker
Bbk intake
Bbk long tubes
Home ported 243 heada
Custom cam
36 lb injectors
Old 12-06-2013, 07:33 AM
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When you change your intake from what I understand
Old 12-06-2013, 09:06 AM
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I had my stock port/polished but I just bought a 90 FAST intake manifold and will be upgrading the TB & MAF as well.
Old 12-06-2013, 09:26 AM
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I did mine when doing the intake. Also dumped $ into bigger lid, z06 maf, and bellow.
Old 12-06-2013, 11:44 AM
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Yea I got my stocker ported and polished was wondering should I upgrade to maybe a 85mm or 90mm
Old 12-06-2013, 03:06 PM
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Originally Posted by chevybayboy
Yea I got my stocker ported and polished was wondering should I upgrade to maybe a 85mm or 90mm
If the stocker is ported it should be to 78mm which is not that much off of 85mm. If the intake is BBK an 85mm is the max you can go. Keep the stocker thats ported unless you go with a bigger intake. Who ported your stocker? Potz Ports has an awsome pp 78mm tb with bump stop mod that really wakes up the car!
Old 12-06-2013, 04:35 PM
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Originally Posted by ws6man29
If the stocker is ported it should be to 78mm which is not that much off of 85mm. If the intake is BBK an 85mm is the max you can go. Keep the stocker thats ported unless you go with a bigger intake. Who ported your stocker? Potz Ports has an awsome pp 78mm tb with bump stop mod that really wakes up the car!
OK cool thanks for the feedback I ported it my self it's really nice very responsive was wondwring if i was chocking it a bit with the smaller tb... plus I have a tb spacer
Old 12-06-2013, 05:11 PM
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any time you can open up the inlet for air to a bigger hole than stock, it is an upgrade...

including when the vehicle is stock...

as soon as you can afford to put a bigger TB on there... do it.
Old 12-06-2013, 05:16 PM
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Originally Posted by soundengineer
any time you can open up the inlet for air to a bigger hole than stock, it is an upgrade...

including when the vehicle is stock...

as soon as you can afford to put a bigger TB on there... do it.
Well in that case I'm going to get the 85mmbbk
Old 12-06-2013, 05:46 PM
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This is just my opinion, but I would just port and polish the stocker unless going with a really good intake like a Fast
Old 12-06-2013, 06:30 PM
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My opinion is you have around 40hp left on the table with the mods you have listed.

With a 383, you've choked it. Both ways.
Old 12-06-2013, 11:17 PM
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Originally Posted by dr_whigham
My opinion is you have around 40hp left on the table with the mods you have listed.

With a 383, you've choked it. Both ways.
Talk to me doc how to open it a bit
Old 12-06-2013, 11:20 PM
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Originally Posted by HCI2000SS
This is just my opinion, but I would just port and polish the stocker unless going with a really good intake like a Fast
Idk you really think the fast is worth the extra coins over the bbk I would need new throttle body and the fast
Old 12-07-2013, 11:21 AM
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Originally Posted by chevybayboy
Talk to me doc how to open it a bit
Just from what you have listed.

The headers aren't helping your cause. A 2.5" Y pipe, a cast version of the LS6 intake, 78mm TB...

Budget version:

TSP 1 7/8"headers
TSP Y pipe or duals
Fast 92 (use your existing fuel rail)
Nick Williams 92mm TB

What's your fuel setup? Do you have a 255 pump and hotwire kit? (RACETRONIX)

Your 36's seem small to me, for a 383. But then again, you might not be using the car to their full potential yet.

I'm curious to know what your MAP reading was at WOT as well as your IDC.

What I've listed thus far is proven to make power on even a stock 346, and even more when the engine demands it.

Remember, you're working with an extra 37 cubes, and it needs to inhale and exhale as efficiently as possible.
Old 12-07-2013, 11:54 AM
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Originally Posted by chevybayboy
Idk you really think the fast is worth the extra coins over the bbk I would need new throttle body and the fast
Honestly, I don't think the BBK is worth it over the LS6, and to me the fast would only be worth it if I could sell the LS6 first while getting the Fast at a good price. If it were me i'd take the $500-$800 and throw it at a nitrous kit. That's just me though
Old 12-07-2013, 12:42 PM
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Originally Posted by dr_whigham
Just from what you have listed.

The headers aren't helping your cause. A 2.5" Y pipe, a cast version of the LS6 intake, 78mm TB...

Budget version:

TSP 1 7/8"headers
TSP Y pipe or duals
Fast 92 (use your existing fuel rail)
Nick Williams 92mm TB

What's your fuel setup? Do you have a 255 pump and hotwire kit? (RACETRONIX)

Your 36's seem small to me, for a 383. But then again, you might not be using the car to their full potential yet.

I'm curious to know what your MAP reading was at WOT as well as your IDC.

What I've listed thus far is proven to make power on even a stock 346, and even more when the engine demands it.

Remember, you're working with an extra 37 cubes, and it needs to inhale and exhale as efficiently as possible.
Yea I have the walbro 255 I'm just using the headers from the bbk I'm running true duals ..

I only choose bbk in the beginning to run my n20 but now I'm thinking about switching setup to to the 92/92 with bigger injectors
Old 12-07-2013, 12:43 PM
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Originally Posted by HCI2000SS
Honestly, I don't think the BBK is worth it over the LS6, and to me the fast would only be worth it if I could sell the LS6 first while getting the Fast at a good price. If it were me i'd take the $500-$800 and throw it at a nitrous kit. That's just me though
Yea I got my nitrous system all set up should I sell bbk put money into a fast set up and bigger injectors or what?
Old 12-07-2013, 12:47 PM
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Originally Posted by chevybayboy
Yea I got my nitrous system all set up should I sell bbk put money into a fast set up and bigger injectors or what?
I would, without question. Sell your current setup, keep your fuel rail, and get some 42# injectors at a minimum, with a Fast 92 intake and a NW or Fast 92mm TB.
Old 12-07-2013, 01:30 PM
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Originally Posted by dr_whigham
I would, without question. Sell your current setup, keep your fuel rail, and get some 42# injectors at a minimum, with a Fast 92 intake and a NW or Fast 92mm TB.
That's what I was thinking moving to the 383 bbk would have been fine for the 347 but for the bigger cubes go fast 92 or even 102
Old 12-07-2013, 02:19 PM
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I agree with what dr whigham said. If it's in the budget of course


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