Z Guy KY Posted June 9, 2015 Share Posted June 9, 2015 Anyone out there who can give me a performance review after installing SM needles to replace the stock needles in your SU carbs?? Would love to know if this was a good performance upgrade. Thanks! -Steve Quote Link to comment Share on other sites More sharing options...
rjracin240 Posted June 9, 2015 Share Posted June 9, 2015 Put a set of these needles on my Z and definitely helped out, surprised the hell out of me at a autocross called the Bay Bottom Crawl looked down in one section where it is pretty short and car was almost to 8K, definitely think the needles helped out on that. Car always pulled strong with these needles Quote Link to comment Share on other sites More sharing options...
Z Guy KY Posted June 10, 2015 Author Share Posted June 10, 2015 Thanks for the review. I want to hear from people who have done this! Steve Quote Link to comment Share on other sites More sharing options...
seattlejester Posted July 2, 2015 Share Posted July 2, 2015 http://www.datsunzgarage.com/dyno/ I bought them, but never installed them. Based off of reading/research it kind of brings your AFR down or up to 12 across more of the rev range. Idle up from 10 to 12 means less of a dog at tip in, at peak power down from 13.5 to 12 means a little less pull up top. Overall a bit safer and a bit more pep off the line. I'm not sure they are necessarily an upgrade per say. I think it was 40$, if you plan on sticking with the SU carbs then a good rebuild kit and such might go further given the effort it takes to install the SM's. Quote Link to comment Share on other sites More sharing options...
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