260ZRED Posted January 24, 2003 Share Posted January 24, 2003 anybody got usefull tips on their favorite performance mod fot the SUs? i gotta do something before the big race...(2002 sentra spec-v) Will sanding down and sharpening the butterfly and the bt shaft help? what about any other mods that help to increase SUs performance? any cheapo 'last minute' speed tricks out there? thx alot! Quote Link to comment Share on other sites More sharing options...
Synlubes Posted January 25, 2003 Share Posted January 25, 2003 I`m not an SU expert, these folks ZTherapy have some or a video that I heard people talk about for hipro tuning. Quote Link to comment Share on other sites More sharing options...
katman Posted January 27, 2003 Share Posted January 27, 2003 Originally posted by 260ZRED:any cheapo 'last minute' speed tricks out there? thx alot! No. You can grind the throttle shaft down and use flush screws like Ztherapy does on their non IT racing carbs, for a whopping horsepower or two. The key to power with the SU's is getting them to maintain optimum mixture above 4000 rpm or so when the slide is pretty much all up (i.e. mixture isn't regulated by the needle anymore). To do this you need to find a way to slow the slide down for the last 1/4 inch of travel or so and custom taper the needle and make about 100 dyno runs to figure all that out. For another 10 horsepower. Hardly worth the effort unless the stakes are big. Keep them clean, keep them tuned, and you're 99% there. Quote Link to comment Share on other sites More sharing options...
deMideon Posted January 29, 2003 Share Posted January 29, 2003 The only thing that ever made a difference that I've actually noticed with an SU is using very light oil in the slides. I use Marvel Mystery Oil. Gives very good throttle response. Quote Link to comment Share on other sites More sharing options...
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