Is the pressure in kpa/bar/something I don't know?

Scorke

 

The pressure is in the unitless measure of PRESSURE RATIO as stated on the maps

PR = (boost pressure + atmospheric pressure) / atmospheric pressure

 

Damn, the 20G just spanks the crap out of the 16G in terms of the size of it's efficiency range.

In general, what VE are peeps using to calculate CFM? Is a figure of 95% reasonable to use for a car with with a ported head and the usual breathing mods?

 

The stock injectors will work for atleast 90% of the guys that buy this turbo.

David Buschur
www.buschurracing.com

 

Thanx Dave, So assuming we did stage 1-3 plus the fuel pump what kind of track times to you think we could run (I apologize if this has been asked before and i know its only an estimate but just ball park) on pump gas...around 400 HP and lke 11.5 ish? Is that reasonable?

 

Is the Buschur 20g suitable for someone who is not looking to push the turbo more then 18-20psi? I can see some advantages e.g 18psi on 20g making a little more then 18psi on 16g but is it worth it? Also bigger turbos provide cooler air but has this got to do with the size of the wheels or the housings?

 

And on that note, will the 20G allow higher levels of boost on pump without detonation?

 

I hate to disagree with someone who knows a lot more than I, but I do. I think that more than 10% of us have cams. With cams and this turbo, I believe that you will need to upgrade injectors. With just the cams my injectors were almost maxed about at 95% duty cycle.

 

I remember Al saying I needed to probably upgrade to 660's or 680's after I got my cams and custom tune a while back. He said my injectors were almost maxed out. I have now problem with upgrading if I need to though.

 

That has a lot to do with your tune...

 

And octane of pump gas available.

 

Yes.
Yes.
They provide a denser air charge at a given flowrate because the larger wheel does not have to spin as fast to flow the same mass of air and thus does not heat up the air as much.

 

The 20G will allow you to make more power on pump gas than possible with the stock turbo.

 

nyredevo,

400 whp with a fast spooling turbo will easily run 11.5's. We ran 11.65 at 117 mph with 390 whp.

David Buschur
www.buschurracing.com

 

Yes, the 20G is very suitable for someone not wanting to run over 18-20 psi. It will make more power at that boost level than the stock turbo does, more air=more power.

The turbo will not allow more boost on pump gas than the stock turbo will.

Yes, a TD05H turbine mated to a reverse scroll 20G compressor is what it comes down to.

David Buschur
www.buschurracing.com