Just got back from the dyno shop. The car dyno'd today is a 1988 1.8ltr Subaru RX Turbo (FT4WD,Manual). I did a baseline run previously and you can see the results here:
http://www.ultimates...t=rx turbo dyno
Today I went about testing three things. First thing I tested was the 'Garner Pulley' I had installed. The Garner pulley was made by a member here who goes by the name *drumroll* Garner. So, I named it so. Since my previous dyno session the only thing done to the car was the addition of this pulley. If you want look/weight info/size/etc, you can find the pulley info here:
The second thing I wanted to test was the air filter. I had one Autozone air filter that I thought may have been restrictive due to what had happened when I cleaned it. A K&N air filter of a different design was put in it's place to see if a difference in hp/torque would be observed. More info can be found here:
The last thing I tested was the affect on putting on an intercooler. Now remember, all intercoolers are not created equal. I used an air-to-air intercooler that's used on the Ludespeed Stage II turbo kits for the Imprezas. This does not make the intercooler special by any means. This is where I got the intercooler from (I had a Ludespeed kit installed on another car then I uninstalled it). More info on the intercooler's look/placement/etc can be found here:
Ok, now for the dyno. I've learned from dyno'ing my cars to NEVER expect anything. You don't know how your car has changed from the last dyno and you don't know what changes in modifications will yield what result. DO NOT go into a dyno session expecting 'X' amount of hp/torque. You may end up being disappointed and even blaming the dyno operator's machine saying something is wrong with it. They don't like that. I know because I've heard of the stories.
I did a total of 12 pulls. Cool down, 2 pulls, cool down, 2 pulls, make change (Ex: air filter), cycle starts again. Out of the 4 pulls, I always pick the 2nd highest of the consistent runs. If all 4 are consistent, I pick the 3rd highest. Just a habit of mine. No pulls were done unless the throttle body/intake manifold was 89F or less. This was measured by a laser beam temp sensor the shop (Xotic Motorsports) own. Enough talking...lets see some numbers.
*Thread not done---Rebooting computer to complete*
You're kill'n us here!
Here are the charts to compare the horsepower and torque of the stock run vs the Garner Pulley run. The max hp of my stock run is 79.24hp while the Garner pulley max was 75.82hp. Stock torque max is 95.19lb-ft while the Garner pulley's torque is 92.19lb-ft. Why the loss in hp and torque?
So you may ask, what the heck is going on? Why is the Garner pulley run making less hp/torque than your baseline run when the Garner pulley is lighter? I haven't made any other changes to the car. I had to replace a tire that was flat but it has the same tire on it when I originally tested and all those tires were new. I did clean the air filter recently but that wouldn't make for less hp/torque. The only answer I can say lies with the air/fuel ratio. Notice how much leaner I am running now vs when I originally ran. I do not know why I am running lean. I have no means to controll the air/fuel ratio at this time. I have no detonation/pinging as far as I know. Perhaps it has something to do with the 93 octane I'm using. Turbo'd Subarus are typically happy around 12.0:1 air/fuel ratio. No excuses! This is what it is and this is what I got. So now I'm starting off at a lower point. Next post will compare the Garner pulley (with Autzone filter that is already on it) vs Garner Pulley with a K&N air filter.