Dyno (thread continued from old board)

Is there an option for URL parsing?

--Dan

 

I can try.

 

Trying to post graph

 

ANother try for the whole thing

 

What kind of a car is this dyno graph for?

 

I think it's for a 550.

--Dan

 

What is different. I see the 2% increase in power in upper ranges -- I mean is the exhaust different? Computer? etc?

 

The hp seems high to be a stock 550. I saw one barely turn 390rwhp, and it was nice good running car.

 

Those figures seem really high. We had a club dyno day and a 1997 Euro 550 recorded 409 horsepower on the rollers.

 

Those figure seem high for a 550. We had a 1997 Euro 550 at our club's dyno day and it recorded 409 horse at the tires.

 

That sounds spot on for a euro car. No way thats a stock 550, either that or the dyno is calibrated incorrectly.

 

Is that SAE net or gross?

 

I agree, the numbers look high.

Cold air and big fans?

--Dan

 

Hey, mine is totally stock with 44,000 miles on it. As any engine gets older, it gets looser, therefore more bhp. (I think)

 

Evosports dyno seems to read almost 10% higher than any other Dynojet I have seen. In talking to someone who does development work with them, he suggested that they have spent alot of time and money on fans etc to try and re-create the cooling/ram air effect of a car travelling at speed. They have been known to remove airfilters/airboxes etc.
Their dyno figure for a standard W211 E55 is 423rwhp. Most other Dynojets come in at 370-390hp for the same car.

 

I've said it before, and I'll say it again...dynos just give numbers which are useful for comparison to other cars or your own car after mods on the same dyno. few, if any, are calibrated the same. Certainly no two I've ever tried give the same rwhp.

 

I have experienced the contrary on Dyno Dynamics dyno's. The guys who do some work on my car use one dyno, I check all their figures on a friends dyno. There is a nominal difference between the two, maybe this is just luck, but I agree and hesitate to quote absolute dyno numbers, rather comparitive increases.

 

Yes, that is what i've experienced too, but change the brand of dyno, and see what happens. Or even just go to one on a day when it's out of calibration.

 

Well said. Too many people get hung up on the absolute numbers instead of the relative changes to the numbers (up or down) after mods are made to the car. There are too many variables...even strap tie-down tension & tire pressure can affect readings from run to run on roller dyno's as well as the temp/humidy/pressure in the room (for all machines). SD