This question comes up occasionally.

If you look at Vortech's advertised data sheet (ref:http://www.vortechsuperchargers.com/...s/scmatrix.pdf), it lists maximum pressure obtainable for a blower. For the V1 and V2 blowers, the table claims 20 psi at the maximum design speed (50 krpm for the V1, 53 krpm for the V2), yet nobody has been able to come anywhere close to 20 psi, although some of us are getting around 14-16 psi by over-revving the blower.

So where is the missing boost pressure? Losses in the boost pipe should only be around a psi or two at most.

I think the confusion comes from how the pressure is measured, and the pressure claimed is the total pressure, i.e. static pressure plus stagnation pressure (the pressure exerted by moving air molecules brought to rest). Our boost gauges measure only the static pressure in the plenum and not the stagnation pressure, hence the confusion.

Vortech references SAE standard J-1723 for the description of the testing method, but SAE wants $47 to download the standard, and I'm too cheap. But I'll bet a doughnut, heck, TWO doughnuts, that the 20 psi pressure claimed by Vortech is the total pressure.

 

Sounds like a typical marketing ploy...

 

Time for a T-trim Stephen.....

 

I test drove a T trim SCed vehicle, it hit over 13 psi very very fast with a 3.25 pulley. Was a Maxima. I did it two times and that was it to ensure the car ran after a motor swap. T trim is very loud. My brother is a beginner at SCers and he loves the noise of a T trim. We are talking about a engineer that works in construction not a car guy.

 

Krispy Kremes or Dunkin donuts?!

 

Round Rock.

 

i think maybe if u play with pulley sizes on the blower and/or on the crank u might be able to get that much psi out of it. but i really have no idea but i sure they got that 20 psi number on one car or maybe on a bench test of the blower without a car and spun it to 20psi. maybe steve u could try and call vortech and see what they say about it.

-will

 

My friend had his IS300 push 20psi on a V2.

 

too far north. too much construction.

SM-are you saying that they include atmospheric into their psi calcuation?

If so, what would be the temp/humidity/etc. that they would measure at?

I think that they would have to state it somewhere.

 

, give me a shout the next time your coming towards this area.

 

What about the E Trim?

How can we get 680hp out of a the V1/V2? Maybe when we hit 20psi with it.

 

We can't. A 3 liter engine is too small for the V1/V2 blowers to pump 680 hp worth of air through it, even at 20 psi and 8000 rpm rev limit.

 

I realize that, but does Vortech?

I am just wondering who they put those numbers there for.

 

They are for larger displacement engines, 350's or 427's that can accept all the air the blowers can deliver.