Dynos - Chassis (hub) Dynos Vs Rolling Rod Dynos

[JP300]

Guys this is part of a reply I put in one of the other threads ...

There was a question about Chassis/hub dynos versus rolling rod (drive on) dynos ...

"The Dynopack dynos are used by some of the worlds larger performance shops and race teams. The NASCAR guys use them, the V8 Brute are all tested with them, MRT, and I think the PAC boys use them as well.

They bolt onto your hubs, no artificial losses via trying to move the huge rolling rods (think Inertia!), no wearing out your tyres, no fudging the figures depending on how the car is strapped down! The ability to hold the car at a certain RPM and tune fuel,spark and boost provides the optimum tuning environment.

Unfortunately this real time tuning is not available when you only run Edit. I have an edit and a Haltech interceptor. This allows the best of both worlds. Edit for the adjustment of the ECU's key parameters, idle, rpm, shift points, adaptive learning etc etc and the Haltech for real time tuning, while the car is running on the dyno. All the actual fine tuning on my car of Fuel, spark and boost is done in real time...

The Edit tuning process is a little more cumbersome... 1. Change some parameters in the software/PC, 2. upload it into the box, 3. upload it in the car, 4. run it on the dyno, 5. check results ... Need changes? Start at step one again. This process takes a minimum of about 5 - 10 minutes every time you want to make an adjustment to the tune. So how many actual incrmental changes can you make in an hour ? Think about it! ...

Back to the Dynopack ... The only downside is that it takes a minimum of about 20 minutes to get the car setup on the Dyno do a couple of runs and then take it off.

Check out:

http://www.tunehouse.com.au/html/dyno_pack.htm

for more info ...

Do not laugh at the VW Bug, it runs nitrous and has run 10s ! ... Jim is involved with some very interesting projects.

Sorry guys I got carried away...... I love cars and motorsport and is what I use to wind down at the end of the week. "

At the end of the day it is the quarter mile performance figures that provide the real indication of how a car performs ...

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[PozzE]

  jp300+ said:

They bolt onto your hubs, no artificial losses via trying to move the huge rolling rods (think Inertia!), no wearing out your tyres, no fudging the figures depending on how the car is strapped down! The ability to hold the car at a certain RPM and tune fuel,spark and boost provides the optimum tuning environment.

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Providing it's not an inertia dyno (big weight that is accelerated by the car), why can't a rolling road dyno be used to measure variables at constant engine speed?

[geea]

jp300+, it's obvious that your here pushing Tunehouse and there services. Do you work for them in any capacity?

The best way for Tunehouse to get some respect and possibly fill a void in the Sydney market, would be to get some of their customers cars to the track and get some 1/4 mile numbers. All different types of dynos can be fudged. You can't fudge the 1/4 mile.

Instead of telling us how woderful they are get some cars to the track and let the numbers do the talking. If you like get some of the Tunehouse guys to come along to the Big Vic Weekend II and show us at Calder/Heathcote what they can do. There will be many different tuners cars racing and potential customers can get a direct comparison. What do you think?

Geea.

[Romulus]

  geea said:

The best way for Tunehouse to get some respect and possibly fill a void in the Sydney market, would be to get some of their customers cars to the track and get some 1/4 mile numbers.

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Wrong. The performance measure for a car is it's ability to go around a race-track, not a 400m piece of bitumen. How's that for one from left field

I know what my car does at the drags, and around a racetrack. I'd judge it's performance based on it's abilities as a complete package, rather than just straight line performance

[rboksic]

  geea said:

jp300+, it's obvious that your here pushing Tunehouse and there services. Do you work for them in any capacity?

The best way for Tunehouse to get some respect and possibly fill a void in the Sydney market, would be to get some of their customers cars to the track and get some 1/4 mile numbers. All different types of dynos can be fudged. You can't fudge the 1/4 mile.

Instead of telling us how woderful they are get some cars to the track and let the numbers do the talking. If you like get some of the Tunehouse guys to come along to the Big Vic Weekend II and show us at Calder/Heathcote what they can do. There will be many different tuners cars racing and potential customers can get a direct comparison. What do you think?

Geea.

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Craig,

JP300 is tuned and maintained by Jim at Tunehouse and has posted some times.

Rob

[JP300]

Geea,

No I do not work for them but like you I do not mind putting in a good word for my local tuner as they have looked after my car and have provided results in every mod that they have made.

Don't you do the same for HPF?

My car has gone through a number of various incremental upgrades and every gain on their dyno has translated to better times at WSID.

I completely agree with you, the best way to prove a cars "straight line performance" (M6 XR6T) is to run it down at 1/4 and produce a slip. I will be doing this within a month or two, as soon as the car has had the auto rebuilt and a fuel pump put in.

I would have loved to be able to come down to Melb to run it in your colder weather but cannot make it. I might try and convince the missus that we need to catch up with some friends down there that weekend then sneak out with the rental car and catch up with you guys at the track.

The only problem is hiring an XR6T, I have a flash tuner, I wonder if Avis can organise one?

[JP300]

  M6 XR6T said:

  geea said:

The best way for Tunehouse to get some respect and possibly fill a void in the Sydney market, would be to get some of their customers cars to the track and get some 1/4 mile numbers.

←

Wrong. The performance measure for a car is it's ability to go around a race-track, not a 400m piece of bitumen. How's that for one from left field

I know what my car does at the drags, and around a racetrack. I'd judge it's performance based on it's abilities as a complete package, rather than just straight line performance

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M6 XR6T,

I agree with you ... I'm wrong ... I guess the performance is a measure of all aspects of a car, in a straight line, around a race track, how well it drives on the Street in day to day traffic...

I thought that most guys in this forum just spoke about straight line performance. I am pretty new to this forum and cannot remember anyone else mentioning circuit racing times for an XR.

Perhaps this could set a new benchmark for some different discussions.

I did not by the car as a circuit racer, having owned a Skyline GTR, I just cannot get the XR6T to handle anywhere close to its circuit performance. (I was running in the 1:08s around Wakefield and 52s Oran Park short track.)

For the meantime my XR6T auto will be used as a cruiser and a straight line racer...