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Originally Posted by The Zedhed
Hey beautiful build, very well thought out and well documnted 
So at 14psi boost your only seeing 2.63psi exh back pressure, thats very good.
You also have a turbo inlet pressure reading as well (12psi) that'll be interesting to compare as I'm going to be running one to with a sealed ram air inlet to the turbo. This is on a landspeed bike so I'm hoping I may start to see positive atmoshere figures at top speed.
Good luck with the car, it looks great.
Ian |
Hello Ian,
Thanks for nice words
I too have a ram air sealed air box for my turbo inlet, there is a carbon duct going down into the nose cone main entry that feeds the air box, I should fit up a pressure sensor there and do some high speed tests.
The post turbine pressure I thought as you was pretty low considering it is fitted with a catalyst, plumb back waste gate, and two mufflers. Being 3.5" internal diameter probably helps that. Also at this low pressure ratio the turbine inlet pressure is lower than inlet manifold pressure which is beneficial for the engine. I did a brief test to 1.2 bar or about 18psi boost and this relationship held true there also.
Look to do up some graphical form of the data and post up so people can have a look.
At the moment I will be trialing a batch of 50/50 by weight methanol and water mixture (at a higher injection flow rate) to gain a bit more power and also have a mixture that is easier to ignite without loosing the amount of cooling I have at the moment. When I do the tests will update on that too. Here is a bit of other online resource of a good dyno test done on the topic (if equalized back to even boost pressures) there was a 6% gain in power from the blended mixture. Post number #1225
http://forums.nasioc.com/forums/show...934903&page=49 details follow on after this post.