Chassis Dyno

[rynez06]

i use a dyno dynamics dyno... i really like it alot of tuning, all the part throttle and ve tuning is super nice because i have so much control via the eddy current... but i have severe traction problems on high power cars, i literally run the straps up through the middle of the rollers and pull the cars straight down into the rollers and i still have traction issues.... another issue is when i have issues, their customer service lacks a little and most of the people that really know anything about the dyno are in australia...
i am in the market for another dyno, i will be looking for a large single roller with some real good steady state control

[CRTD]

Dyno-Mite sent me some great literature yesterday. They make a dyno for everything. They make one small enough for RC cars! Their stuff looks pretty nice. They have roller with a grooved surface. They claim it is superior to the others.

[VYSSLS1]

So what seems to be the preferred roller configuration? As far as holding power, not killing the tires, maint/durability, and safety.

my DD is fine for anything up to 1000rwhp... over that it can be a little hard to hold but it can be done if the car has the right tyres on it,

they dont kill normal road tyres, drag slick and et streets etc do get a little hard time tho but if you let them cool between runs they hold up ok

ive owned 2x 2wd DD's over the past 12 years and have had a few little issues but nothing too major that hasnt been fixed up,
i will be upgrading to a 4wd in the new year hopefully which they will just add the front half to my 3 year old 2wd setup,

ive used another brand of dyno reciently that has been a little under impressive and has made up my mind to stick with DD

[rynez06]

my DD is fine for anything up to 1000rwhp... over that it can be a little hard to hold but it can be done if the car has the right tyres on it,

they dont kill normal road tyres, drag slick and et streets etc do get a little hard time tho but if you let them cool between runs they hold up ok

ive owned 2x 2wd DD's over the past 12 years and have had a few little issues but nothing too major that hasnt been fixed up,
i will be upgrading to a 4wd in the new year hopefully which they will just add the front half to my 3 year old 2wd setup,

ive used another brand of dyno reciently that has been a little under impressive and has made up my mind to stick with DD

i love my DD for anything up to big HP cars and of the course the customer service on a USA side of things, but i feel if i was in australia that wouldnt be an issue... its hard the ignore the steady state tuning abilities, really makes VE and timing table building quick and easy , well most of the time lol

[ctd]

I owned a Land & Sea crankshaft snowmobile dyno, Dyno Mite, water brake.....best thing ever according to there marketing. It's piled up in a corner.

There support was more salesman selling more stuff....you need this...every time you called.

I'm sure things have changed.

[LSxpwrdZ]

I've not had any traction issues on my DD however mine did come with the "traction control" system which is just the metal bar/bracket on the back of the dyno that hinges the straps to a bar behind the vehicle. I usually run 4 straps, 2 of them go over the axle and hook to the other side to create down force onto the roller. I then place 2 from the rear and hook them into axle straps and I leave them slightly loose that way when I make a pull the car will actaully roll forward slightly up onto the roller. But the way the axle straps are hinged on the rear bar it pivots the axle forward and down into the rollers.

My dyno has quite a few hours on it and the rollers are getting warn down so eventually I'm going to see about replacing them or finding someone to re-knurl the rollers I have.

[PST]

Ive used and worked with the Dyno Dynamics, Dyno-Mite, and Dyno Jet... If I had to place them in a list of favorite to least liked, it would go like this:
Dyno Dynamics, Dyno Jet, ANY other dyno on the market, the track, the street, any other way I could conjure up to do tuning, and then I'd still try to burn the Dyno-Mite pile of crap to the ground

[VYSSLS1]

i love my DD for anything up to big HP cars and of the course the customer service on a USA side of things, but i feel if i was in australia that wouldnt be an issue... its hard the ignore the steady state tuning abilities, really makes VE and timing table building quick and easy , well most of the time lol

this is the highest HP car thats been on mine so far..

1140rwhp, went 6.9@202 2 days later...

http://www.youtube.com/watch?v=_LGenRTJr9c

[timg]

I've used SuperFlow (Chassis and engine), DynoJet inertial, Dyno Dynamics, Mustang, and DynaPack dynos.

The SuperFlow was nice, but their control and precision at steady state seemed to be a bit sloppier than Dyno Dynamics and DynaPack. Not a bad dyno to tune on.

DynoJet inertial dynos work great for WOT and power numbers, but I wouldn't choose one for part throttle tuning of ignition on a standalone EMS. I would typically pair this sort of dyno with more extensive street tuning.

Dyno Dynamics was my favorite. Repeatable, stable, and makes it ridiculously easy to tune.

Mustang I thought was similar to SuperFlow.

DynaPack was great, especially not having to deal with wheelspin. However, if not hooked up to a water/cooling system, they can be quick to overheat for steady-state tuning. This was a very close second to Dyno Dynamics and if I had my own shop, is a system I would definitely consider.

Another system to look into in Mainline Dynolog. The hardware is similar to Dyno Dynamics, but argue that they have much more advanced software and data logging capability.

Four of the biggest issues I've seen on any dyno are cooling/fan capability, RPM pickup/interface capability, exhaust evacuation/noise control, and wheelspin. All four of these things can turn any of these dynos into crap if not controlled/planned for.

I did mess with a Land and Sea DynoMite for two stroke snowmobile tuning and it was fairly worthless.

Tim

[PSYKOSTEVO]

I don't own a dyno, so I will just have to speak from my experience using them while tuning. Dyno-Dynamics is the better way to go like some others have mentioned. It is the one that will allow you to simulate road conditions a lot better and induce load on the car. That way you can control the situation on the car and do more "Street tuning" without breaking the laws on the street.

It will typically read a lower WHP number than the other inertia dynos, but it can be more reliable as well. Plus, whp is all relative to your systems measurement anyhow.

And yes, AWD is much more convenient and in demand to have. Lots of high performance cars these days are AWD and that'll be the only way you can tune them.

[LSxpwrdZ]

After I get mine paid down I plan on trading it in on a AWD Dyno Dynamics. I kinda want to get into EVO and Subaru tuning but don't want to venture into it without being able to strap them down. Since I've had my dyno it sucks to street tune anymore haha.

TimG brought up a good point about cooling. My setup currently backs up to a back garage door so all exhaust gets pulled right out the back but cooling fans are a big issue. I'm anal about doing pulls in similar conditions so I find myself alot of times just cruising on the dyno to let things cool off before I make more pulls. I'm using an industrial centrifugal fan and another 36" 3blade fan behind it to keep a good volume of air moving but it's still nowhere near enough on healthier setups that generate more heat. What kind of high velocity high volume fans is everyone running and where do I get one?

[edcmat-l1]

The best air movers I've seen for dynos were over in Europe. I'll see if I can dig up others, but it seemed like every dyno I used had exceptional airflow. One shop I used back in 07 or 08 had a variable speed fan system.

Here's one from last year. This thing moved so much air it buffeted the car!

[LSxpwrdZ]

Awesome... it's really hard to find these type fans in the US for some reason. I've found some of your standard big round barrel type fans that supposetly move around 15,000 CFM which is alot of air but along with the volume you need velocity so I almost need a showroom of fans to try out to see which one would work the best haha.

[minytrker]

I used to own a dynojet 224x but sold it. Been looking at land and sea dyno's or a mustang. The dynojet was ok, was defiantly a good money maker but on heavier vehicles or turbo stuff I couldn't duplicate the same data as on the track.

[SIXXER]

im glad that there are some knowledgeable peoples here talking dyno

here's my question. why does dynojet depending on the model produce all different numbers for the same exact stock car? everyone say dynojet read the highest but this don't seem to be true. some read lower than mustang and vice versa. I thought every dynojet supposed to read similar.

[SIXXER]

so no one has an answer why some dynojet read low and some high?

[LSxpwrdZ]

Most of it from my understanding is in the weather station placement and calibration of that weather station from dynojet.

[SIXXER]

So there's a setting that need to be tweaked within the weather station itself or is it in the same sense as some type of thermometer that could over time have went bad?

I actually asked this same question to one of the owners at this dyno shop that I go to often that always tends to put out 5-7% lower number and he stated that the reason why his dynojet read lower than some of the other dynojet is because it's a bigger dynojet that uses heavy rollers than some smaller dynojet.

Does anyone know how true this statement is?

By the way, they use dynojet 248x in ground dyno.

[LSxpwrdZ]

I've never done a back to back comparison from a 248 to a 224. There is no adjustments on the weather stations but placing them in the hotter spot in the room will cause the correction factor to be higher which inflate numbers.

My Dyno Dynamics has a weather station that I input the temperature, humidity and barometric pressure. Then there is a temp probe the monitors realtime temperature conditions and helps keep the correction consistant between pulls. I dyno'd my personal car in September heat ~90*F and it made 396rwhp. I dyno'd a couple weeks ago in 50*F cool dry air and it made 395rwhp. So I'm not sure about the dynojets SAE correction for atmousphere but mine works pretty good haha.

[VYSSLS1]

i have the auto weather station on my DD, no fudging figures etc...