Mine also tapers to 17 by fuel cut, but by 7krpm its still 19-20psi then falls off quick. It may be a combination of: 1) the engine's VE drops considerably after 7k. 2)the solenoid can't bleed the air volume no more 3) the wastegate creeps open.

It would be awesome if we could make the xede work closed loop...set desired psi map, pressure transducer reads actual psi, xede compares and adjusts accordingly.

 

I think its a car to car variance. My friend Paul's car holds a lot more boost to redline (verified on a Dyno Dynamcis) at less boost values in the XEDE with the same pill. Its strange. Not surprisingly, at the point where mine begins to taper significantly below his, my power reduces in the same spots as well.

 

I added a restrictor to the wastegate line but it still is too big and did not makea difference. Its such a pita to take off and on...

FWIW I measured the pill on the compressor outlet with "Team Losi shock piston drill bits" and a 56 clears 58 not.

 

I run about 20-21psi at red line. I could probably hit 30 psi on the initial spike if I raised the boost values to 100. I have the boost pill that Shiv installed.

 

It's not the engine. The turbo is just running out of breath as mine hold 28PSI to 7800 RPM and 24~25 on pump (not stock turbo).

FWIW my friends GTI with its bullet proof KO4 turbo is setting in my garage now because the shaft drove itself out of the turbo. The turbo is spouse to be bullet proof but he over boosted it and I told him not too. Oil is everywhere on his engine now, water coolant and it's a mess. When the turbo is out if its efficiency range as these guys doing here on the east coast and as my friend did you will see crazy things.

 

If a K03 or K04 is bulletproof, Clark Kent is in danger of being shot to death.

 

cant wait to meet you man


Really, you have to see the mess in my garage. I am going down to take some pics, he thinks I will fix it. You know some times you smile and keep walking

 

Ludikraut,
Nice work on the spreadsheet. FYI you should change the Bar to PSI conversion factor from 14.7 to 14.5037738.

 

Doh, thanks ... didn't realize 1 bar doesn't equal 1 atmosphere. Here's the updated version then. Hehe, learn something new everyday. Yesterday it's compressor maps, today it's this ...

l8r)

 

hey, I just thought of something .... the pressure ratio axis on the compressor maps takes into account the boost that the turbo itself is generating, right? So for all of us that are going by what our boost gauges are telling us, we'd have to assume some pressure loss in the system... So if you're reading 24psi on your gauge, your turbo is most likely actually generating 25psi of boost.

l8r)

 

Did anyone notice the map posted isn't even for the TME turbo? TME is TD05HRA-16G6

 

It is the same just the material is different

 

Does anyone have a compressor map that shows lbs/min not CFM? CFM is only barely helpful, whereas lbs gives you the more accepted measurement and ease of calculating exactly what its capable of.

 

use CFM x 0.069 = lbs/min, iirc at a std temp of 75deg F...

 

Here is a plot I did last year sometime of where my car was operating on the 16G6 compressor plot.

It is a graph of boost vs lb/min airflow in 3rd gear with a spike to over 30psi, and sustained 26psi in ~35 degree F weather. I ran 118mph on that pass. My peak airflow was 44.1lb/min. You can see the turbo spooling up. That is the line that is going from the lower left to the upper right.

This is why datalogging airflow accurately is a good thing. It opens up a lot of possibilities. Technically I should have normalized the airflow to the temperature at which the compressor map was graphed. But I didn't.