The car is an NB1 (4.10 diff) with an NB2 six-speed, Garrett 2560R, an eBay Cast manifold, and a homemade 2.5" Downpipe. It feels great right now and that's the furthest I'm pushing it without a dyno. The car is mainly for autocross, but I want to try and upset some "faster" cars at the Street Fights at Bristol Motor Speedway. Boost tapers from 170kpa at 5000rpm to 180kpa by 6500rpm. Redlines at 7000rpm.

Is 13 seconds in the 1/4 possible? I'm also thinking I run my 245/40/15 sticky bois in the rear and my 195/50/15 daily's in the front. Thoughts?

 

What does this car weigh?

 

A USDM NB1 would not have a 4.10 diff stock. Did you swap one in?

 

edited to not spread misinformation

 

https://beavismotorsport.com/guides-...for-miata-mx5/

https://www.redlineautoparts.com/blo...-buyers-guide/

A USDM NB1 with a 5 speed would have a 4.30 ratio.

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Oh yeah I forgot about the 4.3 🤦🏻

 

RE71r and ~2500lbs with me in the car. #389.

 

Theoretically 250 hp and 2600 race weight including driver should be capable of very high 12s to low 13s. This assumes car is set up optimally with very,very good traction and driven mostly perfectly. Reality will likely be slower, but should get some 13s with practice. If its your first time at the track you will likely be much slower first few passes. Don't expect to hurt too many feelings of drivers with "faster" cars with a 13 second ride though.