Reason for changing to smaller turbo:
to prepare the car for time attack.
the previous s256 turbo was best for drag racing and i tried it during track day, caused me lost of traction. the tires were spinning from one corner to another at sepang circuit and unable to floor the throttle.
Choice of turbo :
GT2871r, GT3071r (GT2835r), TD06 22G, TD05 20G, TD06 with TD05 turbine housing. Need to find the suitable turbine housing to match with the engine setup. Ideally the turbine housing is determining the fast spooling and the top end performance.
the turbo that i choose is :
TD05 20G billet wheel.
11 compressor blade.
12 turbine blade TD05.
TD06 compressor housing.
AR70 mitsubishi original turbine housing.
Why I choose this turbo? Coz I wanna the power available at the most of RPM range around 4500 to 8000
belows pic shows u 20G billet VS borgwarner s256 compressor blade.
coz 11 blades allow power to increase gradually and not too drastic like a twin blade. hopefully it can reduce the tendency of tire spinning. too drastic like a twin blade is more suitable for drag racing.
hi...interested with your last words, valve float. what is the symptoms? And how to overcome this issue?
ReplyDeleteThanks for the reply.
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ReplyDeletewell valve float u can google and get many answer, but base on my experience these are the symptoms:
ReplyDelete1) on dyno u will have missfire @ middle power. in my case around 5500 to 7000 rpm after that u loose power. and u will find that after 2 to 3 dyno runs, missfire occur at the same RPM range.
2) during the missfire u will find dyno graph start fluctuating.
3) the missfire sound was NOT like u r running 3 cylinder (which is normally ignition prob). the missfire u can only hear just a little bit and sometimes unnoticeable. look at dyno graph to be sure.
4) after all the prob above, to ensure it is due to valve float i need to test certain component. i change a lot things, include COP to std ignition coil,plug cables, spark plug and re-gap, X4 IGBT, CAS wire, microtech rewired re-soldered, lt10 ecu, injectors, by pass fuel filter,i than had a head gasket change.
after all components change and test, i got the same result (missfire). very tiring jobs, and lastly i changed to std oem valve spring and std camshaft. what i found was, 1st dyno run no missfire, but 2nd run missfire again. because of that i definitely sure it was a valve float.
There are few method to Overcome this prob on 4g93,u may add additional shim under valve spring, change to beehive spring with Titanium retainer, but in my case i choose BC valve spring from evo, with std 4g93 retainer. Why BC? i will post it later.
nice bro ! good job ! thanks for all the efforts and knowledge !
ReplyDeleteappreciate it !
thanks for ur support bro. i'm still a learner.
ReplyDeletethanks bro. shed some light for me. waiting for your post on valve floating & solutions avaialable.
ReplyDeleteis replacing hydraulic lifter with solid type lifter will make much differences?
currently my powertrain does have the same symptoms as yours. would you mind to share your experiences?
Thanks master..p.
yup..i'll post that one later bro.
ReplyDeletereplacing to solid lifter i never heard on 4g93, and i'm not really sure whether it can be done.as far as i know mostly on 'V' type using push rod engine. how ever if replacing to solid lifter we require to machine it up to our spec to make it precise as clearance opening and closing valve are very critical, in that case we need to find a correct lifter dimension. it also may produce a very2 rough sound during idling until u really scare to hear it. that why it meant for racing only.. like a nascar.
As you know you can actually get the 4G93 solid lifters from WCTS, they are adjustable but pain in the a$$ to adjust. As for correction, just for knowledge sharing since you are willing to learn and not meant for me to show off, the marking 070 on the MHI turbine housing indicates its a 7cm2 turbine housing. Only garretts use A/R ratios for their housings.
ReplyDeleteThe Flank Milled KTS wheels will not get same flows as the original Garrett and SnailTurbo wheels because it is imposible to CNC those designs using flank milling thus KTS compensates a taller wheel design into it to gain more flow. But there is a flaw in the design that I see on your setup that would be the compressor housing, to really utilize the Single Blade design and the extended tip, you would need a ported shroud housing to make use of it. The Single Blade's are prown to surge due to the area of the surface and the design itself.
waaa..jinkl.master of turbo..how is your car? last time we met at the painting shop with lazarus. yeah. i'm thinking of the surging could give me the problems too, i just not sure. during the dyno i did some testing on opening and putting back in the air intake to see any different in surging. the result makes me thinks other problems. how ever u gave me second thought.thanks.
ReplyDelete