is it possible to tune and ride a turbo busa with no fmu?




#1
I have a 2005 busa that I put shim in head new head gasket doback fuel controller walbro 255 and an aeromotive boost sensitive regulator but it still goes a little lean at 10k rpm I don't want a fmu people always say they have problems with them never tried it so can't say for sure just have it all set up and looking for information thanks
 

Moparict

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#3
Yes it is. I have ID1000 injectors, Bosch 044 pump, and a 1:1 regulator. This set up will let you get well over 500hp. At your level I would just choose a smaller injector. Make sure you have a good way to tune while on boost such as a MAP sensor.
 
#4
Little lean , dangerous words on a turbo

FMU work well in a low boost single boost range , its a simple way to get enough fuel out of a small injector , and be reactive to manifold pressure which your piggyback management is not.

once you want more on a gen 1 your looking at bigger injectors 1:1 reg , and a pressure referenced management PCv with hub or AEM , or a complete secondary system like the well tested microtech
 
#5
I have a 2005 busa that I put shim in head new head gasket doback fuel controller walbro 255 and an aeromotive boost sensitive regulator but it still goes a little lean at 10k rpm I don't want a fmu people always say they have problems with them never tried it so can't say for sure just have it all set up and looking for information thanks
I am in the same boat as you. Gen 1 low boost, can't stand the fmu :banghead: Seriously considering going with this standalone plug n play set up. Hayabusa PnP - Megasquirt based custom motorcycle ECU's and acc. It allows you to tune your gen 1 with big cc injectors and still be able to drive it in the low end.
 
#6
Is there a different like aftermarket map sensor I could buy to make this easier for me moparadict I've turbod apex snowmobiles a lot here but the seem to work fine with the stock fuel system up to 300hp without changing the fuel system much at all you're help is appreciated
 
#7
Ozbooster I have a walbro 255 and a aem boost sensitive adjustable regulator 1:1 set at 42lbs with a return just goes to 13:4 at 10.5 rpm so I'm stuck don't know where to go from here
 

Jacobs

OEM Parts/Accessory guy
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#8
Ozbooster I have a walbro 255 and a aem boost sensitive adjustable regulator 1:1 set at 42lbs with a return just goes to 13:4 at 10.5 rpm so I'm stuck don't know where to go from here
13.4 isn't a little lean on a boost dude....
 
#9
Your running out of injector capacity , either get some bigger injectors, or a fmu, the fmu will give best all round running for your $ if your going to stick with 8 psi
 

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