I got a radix on my truck and I usually see around 5-6 lbs at around 5800. I have to hold the gear manually to hit 7 lbs and it hits it only for a split second. How much boost are you guys seeing at or about redline?

 

You should be getting 5.5 to 6 lbs with the stock 3.4" pulley across the RPM band. Boost shouldn't vary very much at all from 2000-6000 RPM's.

 

5.5-6# is correct. There are ways to get more though

Tom



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That sounds about right.....should be about 5-6 psi on that motor.

 

I htought it was 6-7 at redline.

Blown .. get on MSN plz

 

Damn, maybe my truck is gonna blow-up! I get 7 mashed on the floor and then when it shifts it winds up to around 8.

 

sorta dug this up, but today I hit 7.9 psi w/the 3.4 pulley

I just put in the stock airbox w/K&N and holes cut in the bottom, going to see if that makes a difference.

 

good idea, you dynoing it?

 

No dyno, but I have a digital boost gauge (easy to read) so I'll be able to see any increase in boost, as well as throttle response

 

I have a 3" pulley. 9.5lbs
Replaced Brake boost canister with a hydraboost system (brakes ran off of steering pump and fluid...well..the boost for the brakes) and now get up to 10.2lbs

Pulled trailer and a polaris 500 4x4 F-ing heavy 4 wheeler this weekend up we easterners call a mountain and the boost made it to 11.4lbs. Yeh scary...I think something is wrong, but I have some other issues I need to correct first.