I'm getting my 93 FD ready to sell and thought I would have my first dyno run done to include for prospective buyers. Any predictions what rwhp I should expect?
RotorSports Racing stage 2 motor. Pettit turbos, M2 downpipe and resonated midpipe, RB exhaust, aPexi computer programmed by RotorSports Racing and set at 15 psi boost, Greddy aluminum hard pipes, Efini intercooler, Greddy cold air intake. Numerous suspension upgrades that do not affect power.

 

330-350 at best

 

365 is my guess.

 

no mention of injectors... trying to make more than 350 on stock injectors is dangerous...... especially at 15psi. presumably the "stage 2" motor is ported in some way. if it is then the stock injectors are fighting for their life right now lol

 

Thanks

 

Not sure if RotorSports Racing changed the injectors. Also not sure if they have a record of the job they did 20 years ago.

 

https://cimg7.ibsrv.net/gimg/www.rx7...c70d07521.jpeg
Up a little from the stock hp

 

you are way low on power. no way that's 15psi with your mods. i dont think the stock intercooler is THAT restrictive. an all stock car in all stock configuration at stock boost levels on a power fc makes 260/227.

 

FDAUTO....260/227 is hp measured at the flywheel. I'm getting 271 hp measured at the rear wheels on a dyno. Typical loss of power from flywheel to rear wheel is 10-15%. Probably about 300-310 at the flywheel on my car. My boost gauge shows 15psi and the intercooler is about twice the size of stock.
Ron A.

 

260/227 is measured at the wheels.... on my dyno. I don't know what an efini intercooler is but I assumed it was a stock one. All FDs came with the same intercooler. The cars we've put out with similar mods as yours are all making 330 wheel AT LEAST on power fc. only 1 car we've done on stock twins at 15psi and he's makes 340. This is measured at the wheels on my dynapack.

Also want to add thats on a stock port and stock or ID injectors depending on the budget. Still on twins though so it doesnt make all that much of a difference. You're definitely low on power by quite a bit.

 

Dynos are certainly comparative tools but if yours is reading 260/227 on a stock FD it's significantly higher than mine or any other that I've ever worked with.

 

Every so often we put a car from our dynapack on our tuners dynojet and the numbers are very close everytime. The FDs we tune on power fc are fairly consistent with what they make. That 260 number is about where they all land in stock or minor bolt on configuration.

I would suggest looking over your equipment. Something isn't right. Comparative or not, the figures are low for the given mods and boost level. My assumption is the tune on the car is optimal.

 

Years ago, about 20, several guys from the Midwest forum had a dyno session using a Dyno Dynamics dyno and the readings were very low. Her's part of that discussion; https://www.rx7club.com/single-turbo...-455297/page2/ I tried to find the dyno graphs of my runs but cannot find them.

If you google those dynos you can get more opinions. I would just go to a Dynojet dyno and make a few runs with the SAE setting.

 

I own a set of dynapack pods and a Superflow 902. The engines I build and dyno on the Superflow routinely show ~14-16% higher numbers than on the chassis numbers. My two comparatives are pretty much spot on and repeat.

Anywhosit - so long as numbers are compared back to back on the same dyno it doesn't really matter.

 

My car did 369rwhp on Dyno Dynamics and 420rwhp on Dynojet the next weekend, zero changes.

Dyno Dynamics isnt the dyno you want for fluff numbers to sell a car, its a superior tuning tool over Dynojet though.