OMG's what a turnout.. Thanks to everyone who showed.. It was a great event and day...
Special Thanks to JR Competition for giving us a tour of there shop..
Since Emilio has a memory like a teenage girl...here is a little refresher:
Hi Everyone,
I'm a curious person (just like the most of you), but I found it increasingly difficult to understand who's products makes how much power. But from all the posts and dyno plots, it seems that everyone had slightly different scenarios (so no apples-to-apples comparison). So I'd figure I'd try and help out our community by ponying up the $$$ and getting some real-world answers.
So what was the plan for the today? Let's take the exact same car and go to two different dynos to see the differences (keeping as many variables the same).
Who are the gineau pigs? ATP (Fremont, CA) using their in-ground Dynojet and Vishnu Performance Systems (Pleasanton, CA) using their DynoDynamics. They are approximately 20 miles from each other (25 minutes). And finally my car ... 2002 WRX (silver - its the fastest color) with 25,910 miles on it ... the mods are a full Vishnu Stage 2.
What was the test setup? Of course with my luck, the fan ATP used to cool the TMIC broke. Oh well, to be consistent NO fan was used to cool the TMIC at Vishnu's either. I've also seen some posts about the fans used to cool the radiators ... let me tell you that the one at Vishnu's was massively stronger that the one at ATP (so we pulled it a lot farther away that the one used at ATP). I don't think this makes too much of a difference, since the engine coolant temps stayed the same. For those anal people ... ATP was 60deg.F and Vishnu was 61deg.F and I don't think there is more than a 100' of elevation change. I did forget to measure the temperature of the intercoolers (but oh well). The car were driven to their each location, sat around for 20 minutes, driven onto the dyno, sat around for another 10 minutes and then first two runs were pulled and printed. That's all folks ... we don't want to make this more complicated that it needs to be.
The Results:
ATP (Dynojet) - 275.8whp and 232.2 torque
Vishnu (DynoDynamics) - 224.7whp and 192.2 torque
So depending on how you look at it ... Dynojet runs 22.74% higher than a DynoDynamic or DynoDynamic runs 18.53% lower than a Dynojet (with regards to whp).
We have dynoed hundreds of stock late model cars in which we have determined that the DynoDynamics dyno reads 10-12 % lower then a DynoJet. We locked our dyno a year and a half ago at 10% and never looked back. I just dynoed another stock 06' ZO6 which made 458 RWHP and 432 RWFT. That is on the money.
A DynoDynamics dyno has a simple key to push, X, and you can add a % to the numbers. Some people call it a correction factor, some call it a multiplier. It needs to be asked if the operator is putting a multiplier on the readings, depending on the shop some do and some don't.
can you post up both dyno sheets please.. Thanks interesting..I don't think RPMM's dyno read low at all. Last month at GTR (which uses a dyno jet) in the same weather but at an elevation of 1200' or so my car put down 384/351. At RPMM I put down 394/361. Not really that much of a difference considering the elevation difference. The only thing different I did to my car this time was change the spark plugs.
I'll try to do that.can you post up both dyno sheets please.. Thanks interesting..