Zmydust

Bingo! Thats the facts.

GregMB

I continue to wonder why I don't read more about the use of windshield-mounted accelerometers (V-box, etc) or even smartphone apps (Bosch Light 'Em Up, etc).... If you have an accurate vehicle weight to use, it seems that most of these products should be able to give you a reasonably accurate estimate for HP/TQ. The best part is that it would be a "real world" measurement unlike dyno numbers that people always seem to discredit and argue over.

For comparing "before & after" modifications would seem very useful and the results should be repeatable. Perhaps people could still argue over the absolute numbers that a car puts down, but the relative improvement between a "before" and "after" change would be hard to dismiss.

With all the inexpensive data logging equipment available these days (especially the stuff that can easily stream OBD-II data via Bluetooth to a smartphone app) it seems like the vast majority of the information we used to rely on a chassis dyno to provide, can now be collected by the end-user on any stretch of open road.


-G

WayneE

Have you tried tuning a fast car on the street?

There have been many cases where people were hurt or killed trying to do it on the street.

GregMB

No...

But there is a sticky thread called "The Official 60-130 Thread" where people seem to be doing this exact type of data collection quite regularly.

Common sense should prevail when deciding when and where to actually try to capture the data; no argument there.


-G

skratch77

you need to do over 170 to get a full 4th gear pull on the street.186mph to be exact.

GregMB

Eewwwww...... yeah right. I forgot about that. 4th gear is the 1:1 ratio in the transmission isn't it???

So much for my idea. I was thinking that a 0-100 run might be enough to gather useful data, but unless there is some credible way to factor out the effects of the extra gear reduction (and the 1-2, 2-3, and possibly 3-4 shifts) it's not going to provide useful results.


-G

choppo

Those are good numbers to say the least.
Don't know why but when I use the dynojet VS the mustang dyno numbers are always higher from the dynojet.
There is nothing wrong with dynojet or the mustang dyno you just have to base each one seperatly and can't compare the two against each other.
Apples to Apples and Oranges to Oranges

mikekuriger

mustang dyno's are more helpful for tuning because you can apply a variable load and hold the car at any RPM under full throttle. The numbers are not as important as the gains.

HeissRod

That's true, but my old G-Tech did HP estimates with just a 1/4 mile run, if I remember correctly.

skratch77

I dont use a dyno for hp,I use it to see the before and after and make sure its got a good a/f.

A dyno is used for tuning a car,if you want to brag about your numbers prove it on the real dyno and bust out a 10 second pass.

There was a kid braggin about his 135 at the track one night saying he had everything done,meth,race gas,procede V4 intercooler,intakes,downpipes and was saying it put down 470whp and he couldnt trap over 114 that day while I was trapping 122 with 460whp in a car that weights 1000 lbs more than his.

Its funny how every one on e90 post uses a dynojet and posts std numbers over sae just to show inflated numbers