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Four Inch Intake Tube.....too BIG?

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Old 08-03-2007, 11:57 AM
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Default Four Inch Intake Tube.....too BIG?

I have a 6 spd ls6 with exhaust only. Is a 4 inch intake tube too big? remember, we have that 90* bent tube (its not facing forward (ram air) like most f bodies and vettes and stuff) so that might be a factor. Just wondering, is a 4 inch intake tube too big....as in I could lose power/torque. Thanks....

BTW since I installed it, my midrange ( half throttle) seems better....
Old 08-03-2007, 11:59 AM
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I run a 4" intake tube from my lid to my throttle body...although it isn't the same as your application, mine responded very well to it. My part throttle response also felt better.
Old 08-03-2007, 12:59 PM
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alright cool, thanks meent!
Old 08-03-2007, 01:07 PM
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i run a 4" air inlet tube.. and most other conversion/hybrid guys do too...

anything smaller seems restrictive...
Old 08-03-2007, 03:44 PM
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+1 for the 4" intake tube in my swapped Mustang. Seems to run great and throttle response is nice.
Old 08-03-2007, 09:22 PM
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4" here...zero restriction if you're running a 90mm TB
Old 08-04-2007, 10:17 AM
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see im only running a stock 78mm....are u saying my intake tube is possibly outflowing my tb/ls6 intake?
Old 08-04-2007, 11:16 AM
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Originally Posted by 04ctsvfl
see im only running a stock 78mm....are u saying my intake tube is possibly outflowing my tb/ls6 intake?
Probably, but it doesn't really matter, because the part throttle gains I felt with the 4" intake tube were also with my stock throttle body attached to my stock LS6 intake. I think it is the right intake tube size regardless of throttle body.
Old 08-04-2007, 11:29 AM
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Originally Posted by 04ctsvfl
see im only running a stock 78mm....are u saying my intake tube is possibly outflowing my tb/ls6 intake?
Its not a matter of outflowing the TB. The more available the air is to it, the better. Your problem is if your manifold/TB combo are feeding too much air to the motor, thats when you lose power.
Old 08-04-2007, 03:50 PM
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hmmm how can I figure this out....simply dyno and get the airfuel?
Old 08-04-2007, 03:52 PM
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Well you have a CTS-V right? Thats stock equipment, its fine.
Old 08-05-2007, 10:07 AM
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A 4 inch intake is not stock equipment on a cts-v. Our stock tubing is 3.25 - 3.5 (definetly under 4")
Old 08-05-2007, 10:18 AM
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Originally Posted by 04ctsvfl
A 4 inch intake is not stock equipment on a cts-v. Our stock tubing is 3.25 - 3.5 (definetly under 4")
on an 04 yes....but they switched to the 90mm in either 06 or 07 so id say 4" is just fine.
Old 08-05-2007, 01:23 PM
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Originally Posted by 04ctsvfl
A 4 inch intake is not stock equipment on a cts-v. Our stock tubing is 3.25 - 3.5 (definetly under 4")
Your manifold/TB combo is stock, so its not outflowing anything.
Old 08-05-2007, 02:21 PM
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alright. mines 78mm tho......4 inches=101.6 mm is much greater than 78 mm

seems like I may benefit even more from the 4 inch if I upgrade to a 90mm setup, and vice versa it seems like a 90mm setup would benefit from a 4 inch intake tube
Old 08-21-2007, 11:18 AM
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I was about to run a 3.5" tube until I read this post. My new Granetelli MAF sensor is 3.5"
Should I run 4" to the MAF, step down and back up to 4" with silicone couplers ?
I plan to pick up cold air on the backside of the grill of my 69 Camaro.
Any advise is appreciated.
Old 08-21-2007, 02:36 PM
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I really doubt it will be a world of difference either way. But get as much air to the TB as you can.

If a TB flows 100 cfm, and the tube flows 125 cfm, then youre ok, the TB is getting more than enough air to maintain capacity. What you dont want is a TB flowing 100 cfm on a motor that only needs 75 cfm.

(I know the numbers are not accurate, I just picked them for simple math purposes)



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