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  #751  
Old March 19th 2011, 06:31
70Turbobug 70Turbobug is offline
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...that was a close call!
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  #752  
Old March 19th 2011, 13:14
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Humble Humble is offline
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That could have ended very badly! Hopefully you can get that turned around and get it running again soon.
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  #753  
Old March 19th 2011, 16:25
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Wally Wally is offline
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Yeah, did my best today to get it running next weekend. Used a ticker plate and had the divider wall protrude through the tube so I could weld it all the way through. Its 5 times stronger now 4sure and had now room to port the transitions inside the wastegate tubes a little as well



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  #754  
Old March 19th 2011, 17:24
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volkdent volkdent is offline
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Is there any reason to go with an external wastegate vs. an internal(turbo housing)? I'm trying to keep it simple, and I can't for the life of me figure out out if the external is necessary for my project.

Jason
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  #755  
Old March 19th 2011, 18:04
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Wally Wally is offline
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Quote:
Originally Posted by volkdent View Post
Is there any reason to go with an external wastegate vs. an internal(turbo housing)? I'm trying to keep it simple, and I can't for the life of me figure out out if the external is necessary for my project.

Jason
Well, the really large turbo's usually don't come internal, but there are advantages if you do have a choise. Most of them are for turbo nutcases only probably, but an external gate has its own exhaust and therefore does not hinder the exit of the turbine wheel. Keeping back pressure close to zero on the downpipe (turbo exhaust side) is what this does and that is crucial to a good turbo efficiency. A little more power can be had by this.
There is also the better boost control if you have a relatively large turbo and run low-ish boost. Internal gates can be somewhat small-ish and boost creep can happen then. External gate usually flow more and don;t experience boost creep.
Thirdly you can rotate the turbine housing more freely (in all positions, 'clocking' the turbo) if you don't have the arm of the internal gate to consider, which is usually attached to the compressor housing. That makes it easier to position the turbo any way you like wrt inlet and outlet openings
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  #756  
Old March 28th 2011, 15:34
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Wally Wally is offline
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This sunday I participated in the "Automaxx Streetpower Toyo Tires shoot-out" pfft what a name...
but it was good fun, lovely weather and good practice to get some seat time in this 1/8th mile event.
100 mile drive one way.
All went well besides terrible traction and one side of the linkage that fell off (twice...) in 2 of the 6 runs I could do. I'll deff weld the arm to the shaft now! :twisted:

First run on a cold track, cold tires and too much boost:

http://www.youtube.com/watch?v=jkntN1YTjcI

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  #757  
Old March 28th 2011, 16:06
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Nice pic!
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  #758  
Old March 28th 2011, 16:16
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NO_H2O NO_H2O is offline
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Can't keep a good man down for long. Good to see it back in action.
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  #759  
Old March 28th 2011, 23:08
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Sandeep Sandeep is offline
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Now that's a great picture ! Great to hear it roar again.

Sandeep
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  #760  
Old March 29th 2011, 09:52
70Turbobug 70Turbobug is offline
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Sounds great Wally! You can really hear the spool up - very cool!
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  #761  
Old March 29th 2011, 10:55
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Wally Wally is offline
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Thx guys! It was great to be out on a track again.
Mark, where you hear it climb in the revs suddenly very soon, is where it spins the rear wheels...
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  #762  
Old March 29th 2011, 18:14
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Steve C Steve C is offline
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Hi Wally

There was a post on here about bolt porn, the sound of your car is aural porn, love it.

Steve
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  #763  
Old April 9th 2011, 13:10
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Wally Wally is offline
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tnx Steve! Here's another run I found from that day:
http://www.youtube.com/watch?v=8MF7GaaDzVA

Did a new dynorun today with same sort of problem as before: running lean up top...
Its not too small injectors, but since I can log fuel pressure as of yesterday, it showed that FP gradually deminished from 3,5 bar to 2,5 bar at 1,3 bar of boost. Even though I have a boost referenced fuel pressure regulator!
Lambda was approaching 1.0 again...and misfires occured.
I even changed the fuel filter on the dyno and gave a bit more max fuel correction (30 instead of max 20% before). Even though the run didn't misfire this time, it still ran lean (lambda 0.95+ but just rich enough not to misfire and the run ended in 418 hp up top (max rpm 7200). Atm, I think its too small a wire I used for both fuel pumps.

This was at 1,3 bar. I never got to my intended 1,6 bar...

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  #764  
Old April 9th 2011, 16:16
fahrvergnugen fahrvergnugen is offline
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Now get that fuel problem fixed and make a 450 run
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  #765  
Old April 9th 2011, 16:41
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Wally Wally is offline
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Quote:
Originally Posted by fahrvergnugen View Post

Now get that fuel problem fixed and make a 450 run
Yeah, that is kinda the idea Paul
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