what gear did you do it in?

 

i wasnt the one running my car, but i think the guy that owns the place did a 4th gear pull, not possitive though. the dyno sheet doesnt have the mph on it.

 

you should do it in 3rd. i made the mistake of using 4th at first and got about 116 hp before i tuned which in the correct 3rd gear is about 150 +/-5 hp

 

No you shouldn't. You ALWAYS want to dyno run in 4th since that is the 1:1 gear ratio. If you do it in 3rd you will obveously be multiplying the engines hp by .366 or around that.

You can see the gear numbers here
https://www.rx7club.com/1st-gen-archive-71/drivetrain-transmission-gear-ratios-545236/

 

Doesnt the Mustang dyno factor in the coefficiant drag of the car somehow? And thats why the numbers are lower?

 

My buddy has and S4 with similar mods without any porting and made 152 on a mustang dyno (used housings on a freshly rebuilt motor). After he put in Megasquirt he jumped to 176 on the same mustang dyno. I would reccomend an aftermarket ECU.