Update- I just noticed my carb is a weber 27-28. Like for a 1600 VW. I wonder if this is going to work out or am I going to need a larger carb. it seems to run well and it might get better mileage with this setup but i'm certainly sacrificing power.
this might be the cause of my rough running?
FURTHER UPDATEOriginally Posted by 2nup350
I pulled the carb and measured it-it's a 32/36. the number in the side of the carb referred to the original casting, not the machined final size. so I'm not going to buy a carb, but I'm back to square one with the tune. I had a Toyota truck enthusiast look at it and he said it runs better than his 20r, so he's no help. I'm starting to suspect this is just the way this engine runs.
You can give Toyota kudos for reliability, but the Mitsubishi trucks made more power. Back when they raced these things in their own class, anyone who used a D-50 had their trucks nerfed with an extra 150 lbs of ballast to make the overall class more competitive...
Bear in mind that the Weber has a bigger CFM than the Mikuni - it will sacrifice some low down torque for more midrange to top end power. You can reclaim some of that torque by lengthening the intake ducting. Other option is using headers.
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