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Dyno sheet reading 

 

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 Post subject: Dyno sheet reading
Posted: Fri Nov 02, 2007 3:08 pm 
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G'day
i got my car dynod yesterday and i got a pretty good result i reckon, well for the mods i have done to the car. Just a question as the bar goes up on the graph its very ripplery. Is that normal or is there somthing wrong with the car?

cheers

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Posted: Fri Nov 02, 2007 5:57 pm 
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I'd say the dyno operator doesn't know what he's doing. That's a very poor graph.

An EF/EL relatively stock, will have a rising part, a lil dip (as the broadband manifold switches) then rise again to a peak, then it'll fall off til the rev limiter.

It should be smoother than that. Looks like he's feathering the throttle.

I take it it's an auto? If so there's a problem of them "kicking down" on dyno's but an experienced operator can get around that. buy starting the run in 3rd at about 80-90km/h and go from there.

 

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Posted: Sat Nov 03, 2007 12:19 am 
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data_mine wrote:
I'd say the dyno operator doesn't know what he's doing. That's a very poor graph.

An EF/EL relatively stock, will have a rising part, a lil dip (as the broadband manifold switches) then rise again to a peak, then it'll fall off til the rev limiter.

It should be smoother than that. Looks like he's feathering the throttle.

I take it it's an auto? If so there's a problem of them "kicking down" on dyno's but an experienced operator can get around that. buy starting the run in 3rd at about 80-90km/h and go from there.


The Way to get an auto to not kick down during a run on the dyno is to lie under the dash and there is 2 yellow plugs that work the auto. Disconnect em and it will Lock the auto into third (limp mode). The car will still have its full power though.

I assume it works for all BTR equipped cars, maybe AU and possibly BA.

The Map looks very sporadic indeed, but a good result nevertheless.

 

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Posted: Sat Nov 03, 2007 12:23 am 
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i think it was done in second and not third gear, started at first gear and changed to secong at about 80km/h.
i doubt he he his foot to the floor the whole time, thats way to jumpy

 

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Posted: Sat Nov 03, 2007 1:21 am 
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Quote:
An EF/EL relatively stock, will have a rising part, a lil dip (as the broadband manifold switches) then rise again to a peak, then it'll fall off til the rev limiter.

the power curve doesnt usually dip that much, its the torque curve where you see the drop off, and this happens on the graph at the switchover point!

thats about right for the mods you have done, as for the lumpiness in the curve... its not that bad, it looks like a fair graph to me![/quote]

 

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Posted: Sat Nov 03, 2007 8:23 am 
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That car is not strapped down for starters.Tyres arent making contact with the rollers uniformly. The tractive effort N is like that of a turbo car.If done .If it is done in second gear then the multiplication of the lower gear may have something to do with it.

 

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Posted: Sun Nov 04, 2007 4:02 pm 
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yeah it kicked down on him first run and the car nearly slid off the dyno, i told him to turn off the shiftkit but he said it didn't matter. Then he sprayed some stuff onto the tires and its was all good after that.

Also it was done in 2nd gear

 

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Posted: Sun Nov 04, 2007 4:35 pm 
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LOL !!! Why did you have the shiftkit turned on anyway ?

And yeah also he's supposed to run it in 3rd gear for the auto, but alot of operators dont for some reason just like mine was run in 2nd gear when it was auto and pumped out a massive 110 kw :oops:

Converted to manual and run it in 1:1 ratio like it should be and ran 138 kw
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Posted: Sun Nov 04, 2007 5:36 pm 
Getting Side Ways
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does it matter what gear its run in? It should make the same power all way round yeah?

 

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EL Futura: CVE head, Wolf V500, ICE Ignition and Coil, 36lb injectors, Walbro 255lb, Paci comps, 3" exhaust, T5, Harrop Truetrac with 3.9s. Now with 198.9rwkw, (~185rwkw and 13.80 @99.1mph) with more power to come

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Posted: Sun Nov 04, 2007 6:24 pm 
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Yeah it does matter which gear is used. Especially on the autos.

They should always use the 1:1 ratio (or as close as possible) as this negates any torque multiplication too.

A run in 2nd on the auto will produce a smaller result than in 3rd.

 

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1998 DL LTD in Sparkling Burgundy, daily, 302W, stereo, slow - 97.5rwkw
2006 BF GT-P in Ego, mods. 293rwkw - 12.427@109 - 0-1000m 24.838@221

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Posted: Sun Nov 04, 2007 6:26 pm 
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GeZza200 wrote:
does it matter what gear its run in? It should make the same power all way round yeah?


yeah with my manual there was only 6hp difference between 2nd, 3rd & 4th.... not sure how much difference would be with an auto tho?
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Posted: Sun Nov 04, 2007 6:30 pm 
Getting Side Ways
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Age: 29

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Ride: 98 EL Futura

Power: 199 rwkw

Location: Lilydale
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So i could of got more if it was run in 3rd gear? Probly would of got more anyways if it wasn't 26c

 

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EL Futura: CVE head, Wolf V500, ICE Ignition and Coil, 36lb injectors, Walbro 255lb, Paci comps, 3" exhaust, T5, Harrop Truetrac with 3.9s. Now with 198.9rwkw, (~185rwkw and 13.80 @99.1mph) with more power to come

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Posted: Sun Nov 04, 2007 6:35 pm 
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data_mine wrote:
Yeah it does matter which gear is used. Especially on the autos.

.


With my manual it made slightly more power in 3rd instead of 4th (1:1) but that could of been dyno inconsistancies i guess...
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