duncan
Expert Class
Posts: 341
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posted June 10, 2009 05:06 PM
Here comes 400+hp
You all may have remembered my thread about my friend blowing up his stage 1 Mr turbo 14...Well he took his bike to Rodney Williford's and is going to replace all the stock internals, trany, clutch, fueling system, etc and "turn up the boost"
Along with my 14 I have a stage 2 08 turbo busa and it's going to be fun riding{or maybe not...lol}with another big boosted bike. Dubious any info I should pass on to my friend concerning this expensive build that applys specifically to the big Kawa?
  
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dubious
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posted June 10, 2009 05:50 PM
 Edited By: dubious on 11 Jun 2009 01:55
get -2mm shorter rods, and either MTC or JE pistons made for the short rod.
This moves the wrist pin down 2mm, and allows 2mm more material above the top ring.
The turbo's/ NOS burn the piston edge off or collapse the material above the ring at the exhaust valve releif, then the rings stick.
The MTC uses bigger rings.
Run ring gap at .012 to .015. Polosh crank and size brgs for about .0028 to .0032 clearance on the rods. Most run stock clearance on the mains
Back cut trans from FBG or R&D, lock up clutch a must. I prefer MTC 2 stage.
Use the clemms dummy shafts and throw the 2ndary balancers in the bin, this has 2 positive effects, the most important being increase oil pressure and flow to the rod and main bearings, and the other being 4 lbs less reciprocating mass.
52 lb injectors will acheive 430 HP at 85 psi fuel pressure. ~500HP at 100 psi.
These numbers are at 80 duty cycle.
I would definately get a 100 or 40 micron fuel filter before the fuel pump, and 10 micron after.
Plugged pump or injectors and the lean condition associated is really bad news.
If he has the muzzy fuel system upgrade it "should" work. I think the Muzzy pump is small myself .
If not I could spec out some parts, and I also have the muzzy fuel rail sitting on the shelf.
I would sell it for $100, which is smoking deal.
If he has the dough I would do Chris Jones secondary injector system I just installed a few days ago. Get a decent blow off valve and will want a external wastegate too.
There are a few mods to be done to get the blow off to react better.
If interested email me and we can get on the phone.
eldubois at telus dot net.
better yet, if you can get the bike to Chris Jones... I would in a heart beat.
BTW ... he won't make 400+ on pump fuel, and if he does it won't be for long.
Cheers,
Lyle
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natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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duncan
Expert Class
Posts: 341
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posted June 11, 2009 03:21 AM
Good info Lyle, I've tried to get him to join this site but for what ever reason he wont...Problem with this guy is he wants to crank his bike up and go. Turbos require a little effort to keep them reliable and running correctly.
I hope after all the $ he's sinking into this project it gives him good service.
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1badzx12r
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posted June 11, 2009 04:15 AM
file down all sharp corners on pistons ...
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dubious
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posted June 11, 2009 04:46 AM
for sure piston prep is important, also he will need to go over the airbox extensively.
He should consider he velocity stacks Chris sells, same idea as Big CC but cheaper.
at 20 psi it will blow past the stock velocity stacks and blowout the well nuts.
____________
natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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kawiman
Expert Class
Posts: 119
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posted June 11, 2009 09:43 AM
Hey Dubious, for a turbo application, would rods that were stock size (after market) work as well or are 2mm rods the only way to go? Thanks
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dubious
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Posts: 8442
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posted June 11, 2009 05:47 PM
Stock length rods will not allow you to get the desired additional 2mm of aluminum above the top ring
The whole reason to go -2mm on the rods is to allow more compression height and shroud the ring land from all the heat
The short rods and specific pistons for them is the best route.
JE and MTC also make low compression pistons for stock length rods, but the ring land is still as exposed as much as stock rings, do to the exhaust valve clearance releif in the edge of the piston.
The stock rod and low compression piston is better for more boost, and staving off detonation, but the rings are still exposed to all the heat from a turbo engine.
FYI
Busa guys don't have to go this route as they can put an .080" spacer under the deck and runa .080 taller piston above the ring....
We don't need to oring the deck like many of the busa guys do either though as we have much more cylinder stability with the monoblock.
____________
natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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