Road Dyno.. the results are in!
 

OK, before I post this address, let me tell you this is the MOST odd thing I have ever seen. Not only do I think the results would not be as accurate as that on a chassis dyno, but I think it's a rip off.

I have seen some posts on PGMFI about a g-sensor that can measure HP and torque based on movement, (Which I'm going to build and tell you all about it, it looks REALLY cool!!) but this is basing it almost entirely on your ignition pulses and some user fed data.. which can totally skew figures. Not to mention, if you read the bottom section, it tells you, in so many words, that you have to be a PERFECT driver to get accurate results. OK, providing there is some sort of logical equation that accurately translate igition pulse to viable numerical data for measuring HP and torque, wouldn't something this simple be a HUGE thing?

Hahah.. Anyway, if anyone HAS this software, I would like to procure a "demo" from you to give it a test. I promise to delete it with-in 24 hours if I don't plan to buy it. ;)

http://www.charm.net/~mchaney/homedyno/homedyno.htm

Am I the only one that thinks this is bunk? Or has is there some truth to this "Home Dyno"?

Re:Home Dyno.. Only $40?!
 

Dont know very convencing but so is the hks black box BS!
......go for it..

Re:Home Dyno.. Only $40?!
 

i have heard of people getting decent numbers with that setup.

like not dead on but a ballpark.

Re:Home Dyno.. Only $40?!
 

I'm thinking I may invest. It's only $40, and I'll figure something out about the hardware. Apparently I can hack an old timing light to make it work.. Hrm..

Re:Home Dyno.. Only $40?!
 

Hell yea go get and post some times and some stats..

well be waiting
good luck!

Re:Home Dyno.. Only $40?!
 

I found this dyno 2000 thing..Looks like it would work but I dont know how accurate it is..


http://cgi.ebay.com/ebaymotors/ws/eB...&category=6770

Re:Home Dyno.. Only $40?!
 

well for that price its almost as ifyou have to because if it does work youll have your own dyno...
If it doesnt well youll have a nice looking computer screen to show you buds!

Re:Home Dyno.. Only $40?!
 

I have the road dyno version for $110. Works great, definitely worth the money. You can do a lot with it that can not be done on a stationary dyno, like cold air intakes for example, which really become effective at speed.

Re:Home Dyno.. Only $40?!
 

Another point about dynos. You shouldn't be using dyno figures from any dyno simply to be establishing absolute HP numbers, they should be used for tuning and back to back tests changing single variables.

The home/road dynos are good at comparing things, like if you did like 3 pulls with one intake and then 3 pulls with a different one. With all other variables the same, any changes in the curve can be attributed to the modification.

Even if you set the weight of the car incorrectly, if you left it the same for all the pulls, the results will still be pertinent.

Definitely not a bunk idea.

Re:Home Dyno.. Only $40?!
 

Very good point! That makes sense..

Even if the physical numbers are inaccurate, the measurement of increase or decrease would be still be there.. Hrmm.

Ya, I think I'll get it and do a review of it or something. I need to figure out how to make/obtain an inductor.

Re:Home Dyno.. Only $40?!
 

TurboEF9, where are you at? if your close to indy, maybe we can team up and cut the cost.

Re:Home Dyno.. Only $40?!
 

Actually, I live in Kansas City..

Re:Home Dyno.. Only $40?!
 

yo. Kaneda Im from indy.

Re:Home Dyno.. Only $40?!
 

abadboy90, email me sometime at Kaneda13@hotmail.com, maybe we can meet up.

Re:Home Dyno.. Only $40?!
 

Here is an image of a dyno chart I did for my CRX
http://www.proflowdesign.com/images/dyno.jpg

The inductive pickup can probably just be cut off an old timing light, or buy a cheap new one. I bought the kit that included the pickup.

Re:Home Dyno.. Only $40?!
 

Is that the same kit? How would you rate it? Effective?

Re:Home Dyno.. Only $40?!
 

that's a good looking dyno run.

Re:Home Dyno.. Only $40?!
 

This system worked for me well on the first try. It is a little different than the Home Dyno, but the same guy makes and sells both. The home dyno uses a video camera and makes a wav file of the ignition pulses. The Road Dyno version is a little box that does the recording for you, you just plug it in, turn it on, flip the switch and step on the gas. When you get to max rpm, flip the switch back. You can do a whole bunch of runs before you have to upload the info the the laptop.

I would rate it as an easy to use, and the software is pretty friendly, yet a little simplistic.

The only problem I have with it is that you need an open stretch of road that you can do a full throttle acceleration through a gear from 1500 rpm all the way to redline. 1st gear is bad because wheelspin will occur, so 2nd works good for me. So a straight level road that is about a half mile long at least, where you can roll at 5 mph and then accelerate to over 60 mph. So, legally speaking, the track is the only place you can run the thing properly, probably during a test and tune.

Here is a pic of the unit:
http://www.proflowdesign.com/images/roaddyno.jpg

Re:Home Dyno.. Only $40?!
 

If you have to do dyno runs in only one gear, then how do you do it on an automatic?

Re:Home Dyno.. Only $40?!
 

People drive automatics.. for fun?! ;D Just kidding..


OK, people, I've ordered my "Road Dyno", since it's a complete set. Seems more logical than the "Home(Ghetto ;)) Dyno". Hehe.. Should be here in a week.

Re:Home Dyno.. Only $40?!
 

JHill,

Nice website! I like those Throttle bodies. If I wasn't doing a turbo, I'd buy one :)

Have you considered doing a turbokit on your b16?

Re:Home Dyno.. Only $40?!
 

Jim is a hardcore NA guy, haha

never gonna happen, ---- he hasnt even had a ride in my car!

Jeff

Re:Home Dyno.. Only $40?!
 

I'm pretty sure that boost is an addictive thing. Let him have a ride, or let him drive it and he will change his mind :)

Re:Home Dyno.. Only $40?!
 

Street dyno is another good one. The theory behind them is very sound. The only other thing besides propper car data, that you need to worry about is the flatness of the road.
http://www.angelfire.com/extreme4/wa...ages/dyno1.jpg

That is the run I did with street dyno when I first got the turbo on. I started letting off the gas at ~5000 rpm cause I was running out of road. Run was in 3rd with old plugs/wires, crappy coil packs, and running really rich.


Mike

Re:Home Dyno.. Only $40?!
 

Thanks, nice to hear. I would consider a turbo if I were not road racing. The car is going to race in Honda Challenge series. But I did mention to Jeff the other day that if I don't race next yearr, Turbo would be nice. I have ridden in quite a few extremely fast Porsche Turbo track cars, in excess of 150-160mph, and am quite addicted to the pull that they have. I would love to show up with a CRX and go faster.

Oh btw, the throttle bodies have worked well on forced induction too, as it reduces the pressure drop across the actual throttle body in the intake system. We made 14 hp on the dyno with a supercharged S2000 at 6psi. The more boost, the more potential. I have seen 30hp increase with the throttle body on a 9psi turbo S2000, but they added an exhaust at the same time.

Jim

Re:Home Dyno.. Only $40?!
 

Awesome. I might just have to get one then. I will have turbo, highflow cat, and catback exhaust. I can always use a couple extra horses.

Re:Home Dyno.. Only $40?!
 

OK! The verdict is in.. The Road Dyno is pretty damn cool.

We (the chatters in the live chat) had a little problem with highly skewed numbers in the beginning. But, once all the correct values were plugged in, it seemed pretty accurate!

http://www.driftkids.com/pics/dyno/M...no%2003.09.jpg

http://www.driftkids.com/pics/dyno/M...%2003.09-2.jpg

Not too bad for a raped D15. :) We'll see the rate of increase as I add my VTec head, and turbo..

Re:Road Dyno.. the results are in!
 

Heres a real home made dyno http://pages.quicksilver.net.nz/geof.../DIY_dyno.html


http://www.charm.net/~mchaney/homedyno/dynokit.htm

Re:Road Dyno.. the results are in!
 

that motorcycle dyno looks awesome, I didn't read all of it, infact I didn't read more than one sentence, but I figure since he spent about $2200 on it someone could probably build a car one for around $3000. what do the regular dynos run for?