Drive Pressure

[GWoody]

Not positive the attachment will be here but I tried. Look at the boost vs drive pressure relationship with this turbo. This is with an 06 Dodge towing 13000 lbs in large hills.

 

[GWoody]

The red is drive, blue is boost and green is TPS.

 

[AH64ID]

Which turbo?

Got a larger image file?

Looks similar to how my Garrett Stage 2 runs, boost is almost always a few psi above drive.

 

[GWoody]

Here is a couple of links to the turbo.

Switchblade Turbocharger --- Blaylock Turbochargers

switchbladeturbo on Motorhead Garage - YouTube

That was as large as I could post due to size limitations. If you save the pic to your computer you can then enlarge it for better viewing.

 

[AH64ID]

Maybe the runs were done different, but the graphs don't show anywhere near the same spool as stock.

What's the price on that thing?

 

[pwerwagn]

Cool turbo. I like to see new things!

 

[GWoody]

Maybe the runs were done different, but the graphs don't show anywhere near the same spool as stock.



Not sure I understand what you are asking, what are you comparing this graph to?

 

[AH64ID]

The two graphs on the page you linked. Stock makes 30 psi by 25 mph, the switchblade takes until 40 mph. Granted there is more to the story than boost pressure, but that's a big difference.

 

[GWoody]

The numbers on the bottom of the graph are actually tenths of a second not mph. When looking at the graph you are correct in your observation that it does appear the stock charger did spool faster. However when we did those graphs we were looking to compare the drive pressures of each turbo. I don't recall if at both times the throttle was flat footed at the beginning as we were wanting to compare drive pressures and not spool time.

 

[AH64ID]

Don't know why I read mph, not enough coffee

I wasn't sure if they were apples to apples runs or not, would be interesting to see.

I know on my Garrett it runs less boost than stock 99% of the time, but is cooler and when I get on it it screams to peak boost faster than stock.

 

[Hawk]

I would like to see load tests as well. Stock truck on a dyno loaded at different RPM's and then swap the turbo and repeat the test. I would like to see the difference in EGT's and boost pressure. Larger turbo doesn't have to produce the same pressure to acheive the same HP/TQ numbers.



AH64ID I like the turbo on your truck and I'm on the fence about installing twins or keeping a single. So if I go single it will be the Garrett or the II Silver 62.