Sigh!

oh, the pain! not the first time run of 181.8hp (only reasion we didnt print this out, cos the printer was stuffed!)

so he invited me round again 2day (12-9-03) and strapped her on the dyno, and produced a *cough* 173.8 *cough* hp at the wheels, after the second time :(

factors may include that this time a month ago, the tempture was well below 25* where 2day, we had a 31* heat wave.

as you all know, there are pleny of varables that affect dyno runs, and plenty of 'on the spot varables' that can play part to this 'lower' dyno run.
Perhaps i picked up some dodgy fuel?

anyway, i hope you guys dont call me a lying idiot, cos i believe ive proven the potential with various dyno run videos'

i do also respect those who didnt believe me from the start, but if this makes you feel better, well, then have a good day. :)

Ben.

http://www.wycliffe.com.au/private/bens_magna/images/dyno_173-8.jpg

LIAR!!! your cars nowhere as good as mine!!!!

hehehe

keep up the work!!! and the money :shock: The greatest street magna you could make it!!

And anyway whats 8 donkeys diference between friends!!

It's still a nice figure!!

And it was a different day etc...also the temp would be a major player I assume.

Anyway, still it's awesome!

What is the average cost of dyno's test? Might want to do one a bit later on once I get my magna fixed.

You know, I don't think 6 degrees will make much of a difference. The people at the dyno where we were at were saying that even 10 degrees isn't anything to worry about. Besides, an engine bay will probably get to a similar temperature anyway.

I spose humidity would be more an issue if temp isnt?

I spose humidity would be more an issue if temp isnt?

I think you're right but how much of a factor I don't know. I'll ask our fluid dynamics dude. Thing is that with Booya, I suspect that appart from the monsoon season, the air up there would be pretty dry most of the time? Is that right, Booya?

no. this particular time it was hell overcast, with an approx 80% hudimity :(

but also, the CAI has been relocated (and that ribbed pipe installed) since my 181.8hp run. perhaps that ribbed pipe does play a part in this whole saga.

Ben.

Hard to say. Just remember that CAI really only works well when you're moving. At stop, I wouldn't imagine it would have any benefit over the stock setup.

173.8 or 181.8, you would still scream past me.

you may have 5kw's more then me but the matter of the fact is you still drive like a girlsblouce!


hehehe j/k :lol:

the thing i ponder is the estimate of what was it 250bhp or somthing went to 225 then 190 then 180 now 170 ... please tell us the story

i dont have to explain the story.

why didnt you watch the story in my videos???

or would you like me to copy them to VHS for you? ;)

but what does that mean! the all mighty booya is settling for a sub 200 number!

perhaps a change to some stickier tires?? and a tighter clutch!

it will be fun to have all the magna's together in adalaide!, i think that we are going to need sponsership from MMAL for all the parts that we/me are going to brake!

I think that you will find that dyno's can be manipulated. At the risk of sounding sceptical A possible scenario was that the workshop adjusted the ramp rate or other settings to give a higher reading after the fittment of the Haltech. This could have been done to increase customer satisfaction. ie. 30hp gain looks much better than a 10hp gain given that over $2000 has been spent on the instilation. The reason that the hp figure was lower the second time may have been that they were unable / forgot to alter some of the settings. Speculation about temperature shouldn't matter because dyno dynamics have temp and barometric correction.

Cheers
Paul

P.S. I am just playing devils advocate. I am by no means casting dispertions on the workshop involved just offering a possible answer. Like I have stated before chassis dynos can be made to read what ever you want if you know which parameters to change.

i wouldnt worry to much about the change in dyno figures, the temperature does have a big difference (have seen this when dyno testing a genIII, the ambient temp rose from 13º to 20º in the hour we where playing, yeh the sun hit the building just as we went in!)
also the CAI doesnt help a lot when your not moving (Widow will love this) and thus the advantages of a good POD (ok, could be a good panel) setup cannot be measured... then there are the ramp settings, tyre slip (was a problem with the modded GenIII!!!) and operator attitudes...

i reckon a better test is the 0-400m and 0-1000m.... and it gives a better representation of the total package.... not much point having a sweet car if you cant drive for shit!!! (not an attack on booya!) its just stating a fact...

I think that you will find that dyno's can be manipulated. At the risk of sounding sceptical A possible scenario was that the workshop adjusted the ramp rate or other settings to give a higher reading after the fittment of the Haltech.


i understand, but as i have made previous posts, and i can tell you now, that infact, NO SUCH modification of settings have been made to INCREASE my hp readings,

im a bit disapointed you made that point, but i do understand where you are comming from. there will always be sceptics of my final results, and those people will never be satisfied. no matter how much i talk, show, and try to prove. they will never soak it up.

afterall, the variations in temp, plus the pod not in its original location, could well mean the loss of 8hp, as imbarrasing as it is for me to not post a 181 result, i feel ive informed you guys, the readers, the most accurate, proven, tryed and tested results step by step, without leaving a single detail out, and where details have been left, ive been quick to fill in the pot holes.

but like i know, those who dont believe in UFO's, never will, till they see one ;)

Ben.

Ben,
I had not intended to cause any offence and as I stated in the P.S. at the bottom of the post I was mearly playing the devils advocate. I have no opinion one way of the other with regards to your results. The fact remains that I don't know you or your car or the people that were doing the work. For me to make negative comments about your car would be based on nothing more that bullshit if I did because I have nothing to base the comments on. I was mearly offering a possible explination to a problem that I have seen before and I know has been done by some of the more "Dodgy" operators getting around.

Cheers
Paul

tis cool paul, i didnt take offence (its a god damn forum, who gives a F)

but what i was saying is that for everone else, those results ive posted have never be exgerrated or minulipated (damn bad spell day :P)

Ben.

i wouldnt worry to much about the change in dyno figures, the temperature does have a big difference (have seen this when dyno testing a genIII, the ambient temp rose from 13º to 20º in the hour we where playing, yeh the sun hit the building just as we went in!)
also the CAI doesnt help a lot when your not moving (Widow will love this) ...

Oh so that's why they invented Asmosphereic correction ?

I guess the one thing that you have to be aware of with regards to dyno testing an LS1 is that as soon as the temp rises even a little bit the factory management will pull out a big heap of ignition timing due to the way that it is set up. You will find that is why there could have been a big difference in power. The difference in power for a car I think is around 1hp per degree C from what I can remember or at least that is a ball park number anyway.

Cheers
Paul

i beleive its for every 10degree's in intake tempreture rise there is a 1% powerloss , or somthing remotely similar to that

...the temperature does have a big difference (have seen this when dyno testing a genIII, the ambient temp rose from 13º to 20º in the hour we where playing,...

Umm... a degree rise is only a 2.5% change in temperature. I wouldn't imagine that a 2.5% increase in temperature would have a huge difference.

Don't forget to use the absolute temperature (normal + 273.2).
So a change from 13 to 20 deg C is only a 2.45% change in temperature and density (as Redav said).

Don't forget to use the absolute temperature (normal + 273.2).
So a change from 13 to 20 deg C is only a 2.45% change in temperature and density (as Redav said).

i beleive you mean 2.452232version2232q4a

:lol:

Wonder what a humidity change from 20% to 80% can do?

higher humidity allow air to cool faster? because the water droplets have a high specific heat? Therefore the difference is not much?

i dunno, jst relating to chem. :oops:

High specific heat makes things change temperature slower for a given rate of heat transfer. Or do you mean something to do with evaporation? The water is already in gas form so there's no latent heat of evaporation.

Water doesn't burn and it replaces useful air which contains oxygen. Though normal figures are only about 1 or 2% absolute humidity so maybe there's another effect?

who give a rats ass wat they say ben. you got it up to that leveland your still going. at least your doing something about it not just talking about it.

who give a rats ass wat they say ben. you got it up to that leveland your still going. at least your doing something about it not just talking about it.

who and what are you talking about ? :? :oops:

[quote:20cb8ff15f="MaGnA99"]who give a rats ass wat they say ben. you got it up to that leveland your still going. at least your doing something about it not just talking about it.

who and what are you talking about ? :? :oops:[/quote:20cb8ff15f]

i was just a bit anoyed at how people were giving it to goldbooya instead of saying well done

i was just a bit anoyed at how people were giving it to goldbooya instead of saying well done

Oh , you must of missed the other 1000 threads about his car , here we where discussing his power gain and how dyno's and weather can vary and you come along to the convo and think where talking about somthing else

i apologise for my ignorance and intrude in the conversation, i should red on more instead of jumping straight into it head first. ;)

i apologise for my ignorance and intrude in the conversation, i should red on more instead of jumping straight into it head first. ;)

Yeah, well don't worry about it. We've all done it at some point. I think most of us a pretty impressed with his efforts and results.

none more impressed than booya :D :D but he should be proud, a lot of money and agonising waiting for those damned results!!

yeah. booya should be happy, it woulda totally changed his car (no he just gotta work on those gear shifts!! :lol: )

now, back to the hijack.... and that GenIII

as the temperature rose, we did loose some power (not much... only about 2kW at the bags)... its not just the intake air temp that is effected... the engine temp went up as well, ok, before you say its going to do this naturally, we had just driven from Mudgee to Bathurst (i guess around 150km) before sitting it on the dyno... and yes the temp rose again while on the dyno....(this is according to the little computer logger thing they plugged into the engine...)

as for humidity, i got nothing...
and i know my car uses less fuel HWY cruisin when the temp is 20°C (9l/100) than when cruisin at 40°C (9.8L/100).... (same hwy, same speeds) which means im not getting the efficiency, which means i wont get as much power!