TBSS intake vs stock
Oct 29, 2008 | 12:57 PM
#14
Now, keep in mind some will tell you the 90mm hole bottlenecks down to 78mm, then opens back up into a 90mm opening. Some will say this is restrictive, I think it's intelligent design at work and GM is trying to produce a venturi effect that will enhance torque everywhere but still give you good flow up top. For the price I'm getting it at, if I don't like the setup, I can sell it all for what I'll have stuck into it. If I understand everything correctly the intake is a direct drop on except for one vacuum line and the TB adaptor. I wonder if a TBSS intake cover will work under the hood.......
Oct 29, 2008 | 02:29 PM
#15
I am going to revoke my statement from earlier - I am going to be upgrading to a TBSS intake as well with my setup. My ported heads are demanding more than the intake can supply. I found a new TBSS intake complete with fuel rails, injectors and TB for $230 shipped. Another $200 or so in a Dr. X harness and I should be able to do this for around $500 or less. Still better than cutting brackets, relocating pulleys, etc. Now, keep in mind some will tell you the 90mm hole bottlenecks down to 78mm, then opens back up into a 90mm opening. Some will say this is restrictive, I think it's intelligent design at work and GM is trying to produce a venturi effect that will enhance torque everywhere but still give you good flow up top. For the price I'm getting it at, if I don't like the setup, I can sell it all for what I'll have stuck into it. If I understand everything correctly the intake is a direct drop on except for one vacuum line and the TB adaptor. I wonder if a TBSS intake cover will work under the hood.......
Now, keep in mind some will tell you the 90mm hole bottlenecks down to 78mm, then opens back up into a 90mm opening. Some will say this is restrictive, I think it's intelligent design at work and GM is trying to produce a venturi effect that will enhance torque everywhere but still give you good flow up top. For the price I'm getting it at, if I don't like the setup, I can sell it all for what I'll have stuck into it. If I understand everything correctly the intake is a direct drop on except for one vacuum line and the TB adaptor. I wonder if a TBSS intake cover will work under the hood.......my exhaust isnt making my power suffer, neither is yours. the tunes are close enough... i am almost positive it would have to be my stock 4.8 intake.. and your stock intake as well. i dyno'd cutouts open and closed... still wasnt happy with the power levels..
Oct 29, 2008 | 04:54 PM
#16
i think you and i are in the same boat here man.
my exhaust isnt making my power suffer, neither is yours. the tunes are close enough... i am almost positive it would have to be my stock 4.8 intake.. and your stock intake as well. i dyno'd cutouts open and closed... still wasnt happy with the power levels..
my exhaust isnt making my power suffer, neither is yours. the tunes are close enough... i am almost positive it would have to be my stock 4.8 intake.. and your stock intake as well. i dyno'd cutouts open and closed... still wasnt happy with the power levels..
Oct 29, 2008 | 05:17 PM
#18
I'm just having a hard time believing that your intake is restricting you, especially at only 5200 rpm. There are plenty of accounts of the truck intake pulling well into the 6000's
Oct 29, 2008 | 05:19 PM
#19
same intake, same dyno, my 4.8 peaked at +6000.... i think around 6200 or so ?
this motor peaked way lower, but has more volume, better flowing heads and a much bigger cam..
i not know?
this motor peaked way lower, but has more volume, better flowing heads and a much bigger cam..
i not know?