23 replies to this topic

[RallyRed]

careful with that...often 2 plug leads fall off, just before the dyno...lol

[jd lj]

"it only revs to 4500rpm's, honest Mr inspector". A very restrictive air filter might be required. Maybe give an air filter element a nice heavy coat of clear to achieve that result.

[Rockoz]

Why not just use another saved file with different details on it?

Seems like less of a hassle.

[LXCHEV]

Pull a whole lot of ignition timing out of it, and adjust the throttle cable bracket to only allow half throttle. That should help!

[Oversteer]

Ahh good old WA DOT strikes again..... they are on a mission at the moment !

 

Did they suggest who to use for dyno report ? or how to do it....i suspect "most" who are going to have their name on a report that goes to DOT would be un-willing to falsify...

 

....be careful what you say on open forum also you would likely be up for a swept volume test...so its gotta be tree fiddy ci !

[MustardGTR]

....be careful what you say on open forum also you would likely be up for a swept volume test...so its gotta be tree fiddy ci !

I am curious what how one goes about a swept volume test?

Does it involve taking the head off and measuring the bore and stroke?

[rexy]

You need to know a few more things.

What are the pass/fail criteria for the report if any?

Who is authorised to perform/ provide such report?

Assuming there is a maximum allowable rear wheel power figure then you can nobble it as needed by reducing the timing, fitting exhaust restrictions or whatever other method you like.

[Bigfella237]

Yep, it's a typically stupid request by a know-nothing government numty.

 

For a start, no two dynos read exactly the same figures, and then as above, there are an almost unlimited number of variables that affect the result.

 

Unless they are going to insist on one "approved" person doing all their tests, and also insist on him or her going right over the vehicle and doing a full inspection and tune before every test, then the whole idea is pointless.

 

It's just yet another exercise in bureaucracy.

[71xu1]

The bigger picture, within DOT spec for HP whatever that is, so car passes. All good, undo all the restrictive stuff done to limit HP. Hope to hell you don't have to make an insurance claim and they ask for a HP as the car is no longer roadworthy.

[Oversteer]

I am curious what how one goes about a swept volume test?

Does it involve taking the head off and measuring the bore and stroke?

Can be done many ways with only removing spark plug, stoke is easy to measure, I believe the current method involves a device that fills cylinder with oil and measures what comes out in one stroke.

 

WA DOT are trying to limit everyone, engineered or not,  to the old 180Kw per ton.

Edited by Oversteer, 27 June 2018 - 02:56 AM.

[myss427]

WA DOT are trying to limit everyone, engineered or not,  to the old 180Kw per ton.

 

Wow, look out Ferrari or Lotus or any supercar maker!

[Rainman]

What about a single barrel carbie (if you cant get one) and get it jetted as small as possible. Is there something you can also place in your petrol as to not be crisp, then drain later. Can you adjust the carbie or floats so it only dribbles. Rainman

[Rainman]

Open the gap on plugs so it doesn't fire to well. Small leads to limit spark

[Rainman]

Take off the extractors make another gasket with smaller holes. Fit a hidden rev limiter and turn it down to 3800 rpm. Fit a ford badge under the car until you get it out of sight

[cameron]

Get the dyno report and photoshop what they need it to say.

They are just being di#kwads.

 

Cameron

[Bigfella237]

What about a single barrel carbie (if you cant get one) and get it jetted as small as possible. Is there something you can also place in your petrol as to not be crisp, then drain later. Can you adjust the carbie or floats so it only dribbles. Rainman

 

Actually, I would strongly advise against this.

 

You can pull all the timing you want and at most the engine will run hotter, but if you lean it out, especially on a WOT dyno pull you're just asking for trouble.

 

Which brings up the question: if something goes BANG-CHUGGA-CHUGGA-CHUGGA-CLUNK during this government-mandated dyno test, who pays for the repairs?

[Rainman]

Not me , but there has to be a way to bring down the hp for the short term. Have been told restrictor plates in exhaust, but the compression could damage the motor. Thought you would know Andrew, but there may not be a way without potential damage ? What about the ford badge ? lol

[Shiney005]

They aren't worried about emissions unless you are using a later model motor. If it is a carby motor then they will only be looking at the carbon canister and other standard LX fare. I am surprised they are now asking for swept volume. That could be a sticking point. Six months ago, they were only looking at how many horsepower the donor motor had when it was new. Hence, no Gen 3s in Torana's any more. Do you know anyone with an old standard 350 you can fit to get it passed?

[Bigfella237]

 ~ I am surprised they are now asking for swept volume. That could be a sticking point. ~

 

I suppose it depends how dedicated you are, could always throw in a standard stroke crank for the swept volume test? Who's to say you didn't spin a bearing and need to replace the crank after it's on the road?

[LC-GTR-1969]

Agree re timing. Pull 15 degrees of timing out of it and restrict it through intake and exhaust- throw a peashooter on it and try to limit the intake. You'll be lucky to make 200hp at the tyres doing the above. The advantage with small exhaust is its not considered 'cheating'. You are simply ensuring your engine meets EPA Noise compliance. If the dyno operator picks up that the timing is retarded- just say it runs high compression and was pinking so you needed to back it right off when running street fuel. Tell them that at the track you need to run avgas or MS109 to run full timing. 

 

Problem solved. 

 

Manufacturers have been doing the above three things for years (especially motorbikes). 

Edited by LC-GTR-1969, 29 June 2018 - 09:21 AM.

[myss427]

Remember what they did to the L34 exhaust, tiny secondary pipes to restrict it, worked for the factory!