grey matter 04

iTrader: (9)

yep i been threw this with everybody already
i have time slips for every mod done
I spent the $500 to do the swap did my own track testing and lost performance
yep everyone claims gains and there is a dyno from a 6.0 not 5.3
the temp is also way colder on those dyno runs so could the temp be the 20 hp gain?

PathfinderJr

iTrader: (6)

The 6.0 was one example, but there are others on here with other engines that have reported claims. That's not to say everyone will get the exact same results, but there should be nothing but gains from an intake with a larger plenum volume that will be more responsive to the demand signal from the engine. Sucks you didn't see an improvement, but I firmly believe it is still worthwhile.

grey matter 04

iTrader: (9)

too much plenum volume for a small cubic inch motor!
big plenum volume slows air velocity which created a bog between shifts and loss of torque down low

FYI mhotrodscooter put that manifold on a 6 liter and saw no gains at the track he has a post about it!
thread titled no improvement by mhotrodscooter in the drag racing section

others have chimed in with similar results in the thread

Rhino79

iTrader: (7)

It works well on my 4.8, that came with 243's. I think throwing the tbss intake setup on regular old 4.8/5.3 heads is probably bottle-necked due to the lower flow of the older heads. If it was a performance killer, gm would not have installed it on every gas burner from 07 and up. It may need the 243's to work best though. Heck the older 4.8's were a half a oint higher than my 09 on compression yet made 20 hp less. And no its not all in the difference in stock tunes, hell my 09 was only running 18-22* timing @wot before i tuned it.

grey matter 04

iTrader: (9)

Yes that could be because of the 243 heads 10cc bigger in take runner and ability to flow more making use of the intake.
The point point is every claims a gain and when it doesnt work on some setups your a retard because theres a dyno showing 20 hp from the intake swap!

Rhino79

iTrader: (7)

Lmao, i don't doubt it lost power on your setup or any setup with smaller heads. The smaller port has a lil higher velocity and better choice for a torquey setup like yours.

PathfinderJr

iTrader: (6)

You're mistaking a larger plenum volume for larger intake runners. Yes, larger intake runners more often than not create a lazy intake charge velocity that hinders low rpm cylinder filling, but enhances cylinder filling at higher rpm.

A larger plenum volume just keeps a larger volume of intake charge "in reserve" in a sense so as to better keep up with the demands of the engine at whatever rpm you're at. Plenum size will not slow down the intake charge.

grey matter 04

iTrader: (9)

that air in reserve you calling it because of plenum volume caused a bog because it takes that much longer to move all the excess air needed by the motor
Smaller plenum volume moves air quick as needed because the amount is smaller
Basicly the same issue with a big CC intake runner

PathfinderJr

iTrader: (6)

lol alright, believe what you want, cause it sounds like you're convinced of your argument. i'm just gonna let it go.