TRD blower questions, maybe issues?

I obviously got one and haven't had it in for an overly long amount of time, stock pulley on an otherwise stock system minus the AEM fuel pump.

Anyways, during boost I notice that the most I possibly make is around 5.4 at sea level. I have to be stomping on it good to get to that. I thought these blowers were getting up to 6 or 7psi? Is that normal?

Also, is it normal to watch a digital boost gauge mildly jump between pressures as you drive it? Lets say I'm driving down the road and give it boost. I am seeing at that moment 3.5 and it goes to 3.8 but then it'll vary and drop back down to 3.5 or 3.2 (in a quuck manner) unless I throttle deeper into the pedal. It never stays solid in one number for very long like 3.5 or 4.2 psi for example. It mildly fluctuates under boost basically. Normal?

 

Weather will dramatically effect my psi here in Kansas. I see a max of 6 with cool evening temps now but in 95+ degree days I barely see 5. Also the boost ramps up so you won't ever see you max at 2500-4500 rpms. On the gauge deal I don't have a clue since I've got a manual gauge and it seems very smooth in operation.

 

Like stated about. High temps will lower your boost as the air is not as dense as it is when its colder.

 

my truck in charlotte nc area makes 5.5 lbs of boost. It will spike to 6lbs. so I would say thats about right.

 

The way I have it running right now is a direct connection from the available (normally capped off) vacuum port running to a map which then converts all its information over into a digital guage. It's made by MTX.

So the way boost ramps on these is different then on something like lets say the Terminator Mustang's due to its fly by wire vs. Cable operated throttle?

 

You think the arm may be causing the erratic activity that shows up on my boost guage? Is there an adjustment to it ir something? Its that linkage assembly to the rear of the SC housing isn't it.

 

I see. Yeah I could understand that. I wanted analog initially, but it just blended very well with the dash and bezels colors. It looked good mounted up on the dash. I guess maybe I should just stop qorrying about it. I'll try to take a video of it so I can determine 100%. Thanks for all your help lately Jason. Everyone else who chimed in as well!

 

let me ponder here.

Why would anyone want to have a device that lets boost bypass (the actuator in question). Seems like thats defeating the purpose of the SC under non WOT conditions.

 

5 to 6 psi is normal. 6 psi at sea level. Less if you're higher in elevation. If you want more info on the subject just head over to XRU

 

5.4 psi is the most I have ever seen. And that is about as temporary as a prostitute who just found out she is getting underpaid for her services then storms out. I thought it was a bit easier to hit that number though. Normally I see a bit lower on the guage, about 4.8 psi.

Makes sense. I would assume that is one of the reasons why the roots blower is one of the most efficient blowers out there that doesn't penalize you heavily just for having the blower operating.

 

Because more boost creates a more efficient motor. Id much rather have more power under low to mid throttle openings where the truck spends 90% of its life. Maybe im just thinking about it all wrong.

 

And here I was thinking I possibly had pulley slippage occuring. This is good info to know. Thanks Christian!

Yeah it does. Crazy. I feel them every once in a while.

 

ah shit.... see you found my weakness.... i hate reading books. But give me a technical topic to research and understand and there goes my evening on wikipedia and technical documents.

From my quick 10 min o searching i understand it as not starving the rotors for air to pull at on the roots style of positive displacement superchargers. So at low throttle openings where its hard to pull air through it would actually be a detriment to performance and supercharger life.