My Dyno!
03-15-2004, 04:43 PM
#26
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Originally posted by islandsoon
I don't see how this can be. If in fact the car is in safe mode and the car is dumping fuel/retarding timing/doing whatever it can to be in safe mode, any changes made to the engine will just give you a comparison against the safe mode base. What does leaning out the mixture with a piggyback or changing the air intake and then testing it against a safe mode setup tell you?
I don't see how this can be. If in fact the car is in safe mode and the car is dumping fuel/retarding timing/doing whatever it can to be in safe mode, any changes made to the engine will just give you a comparison against the safe mode base. What does leaning out the mixture with a piggyback or changing the air intake and then testing it against a safe mode setup tell you?
03-15-2004, 07:12 PM
#27
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Originally posted by Mike Ockshuge
My point is 90 pct of the dyno's you will be comparing against are going to be dyno jets, so when comparing a dynosheet of a mustang dyno to a dyno jet factor in a rough 15 pct.
FYI, a dyna-pac will measure less than a mustang dyno or dyno-jet and they will tell you that a dyna-pac is the most accurate.
i say its all a crock of crap and the only way to judge and get an accurate real world estimate is take your car to the drag strip and get a before and after trap speed.
My point is 90 pct of the dyno's you will be comparing against are going to be dyno jets, so when comparing a dynosheet of a mustang dyno to a dyno jet factor in a rough 15 pct.
FYI, a dyna-pac will measure less than a mustang dyno or dyno-jet and they will tell you that a dyna-pac is the most accurate.
i say its all a crock of crap and the only way to judge and get an accurate real world estimate is take your car to the drag strip and get a before and after trap speed.
A mustang dyno is a load generating dyno where as the dynojet takes less effort against the car once the drums are rolling hence numbers that can not be compared. Which is better is pointless.
The important part of going to a dyno is to compare numbers before and after a mod to see gains and for tuning.
For a real comparison between cars and power, I could not agree more about going to the track. Your trap speed can tell you a lot.
03-15-2004, 07:18 PM
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For comparison, on a dynojet, that number could well have been in the high 180's or low 190's.
Why do we assume this car went into limp mode anyway? I would like to see this for myself. I really need to go to a dyno.
Chuck, what was your experience with this? I am interested in hearing from someone who lives near me with their own dyno experience.
Why do we assume this car went into limp mode anyway? I would like to see this for myself. I really need to go to a dyno.
Chuck, what was your experience with this? I am interested in hearing from someone who lives near me with their own dyno experience.
03-16-2004, 10:42 PM
#30
I've never dyno'ed any car, but my 8 is easily the quickest of them all. All I have to say is keep the revs high and floor it to quickly cut around slow people in the passing lane. It's so much fun.
03-22-2004, 12:52 AM
#39
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JECS. I posted the result at the following link
http://www.rotaryextreme.com/rx8dyno.html
Chuck Huang
http://www.rotaryextreme.com/rx8dyno.html
Chuck Huang
03-22-2004, 01:13 AM
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>read the other posts after mine. any percentage change shown on the dyno is a percentage change, whether or not the car is in safe mode or not.
It sounds good, but that is incorrect. If the ECU changes the timing or A/F ratio in any way (for safe mode), that will effect other parts of the system quite significantly. Same for other changes by the ECU.
Lets say you were doing a fuel map change and the ECU goes to "safe mode" by richening the mixture (just a basic example, im not saying it does this). If you got a 5% hp increase of by setting your mod in place, you cannot assume that the 5% will happen if the ecu doesn't richen the mixture. There is just no way to know, too many variables etc. Even airflow is effected by minor changes. It would require a proper test.
It sounds good, but that is incorrect. If the ECU changes the timing or A/F ratio in any way (for safe mode), that will effect other parts of the system quite significantly. Same for other changes by the ECU.
Lets say you were doing a fuel map change and the ECU goes to "safe mode" by richening the mixture (just a basic example, im not saying it does this). If you got a 5% hp increase of by setting your mod in place, you cannot assume that the 5% will happen if the ecu doesn't richen the mixture. There is just no way to know, too many variables etc. Even airflow is effected by minor changes. It would require a proper test.
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