ok well,

b4 i get into it , yes i know different dyno's make difference figures and yes i know different weather conditions vary the figure!!

the last time i got dyno'd i got 130 kw's with cat back zorst and flowed TB , my mates NA supra got 108 atws,

since then i have got new extractors, with custom lobstertail Y pipe ( bit wank factor )really), i have also put the RPW inlet manifold on ( the one with internal ram tubes).

my mate in his supra has sonce done nothingjust visual mods,

he pulled 118 on the dyno awsome,

i was hoping for atleast some kind of gain knowing it was a different dyno, but i LOST 7 KW's!!

i know dyno's vary but i shoulod atleast be able to see some sort of power gain here and not a substantial loss!!

and if the dyno was infact reading lower then my mates supra would have pulled a lower number than his originbal 108.

so what u guys think? could my car just need a tune that bad now ( i do have an emanage waiting to go in but i am waiting on my heads first)

thoughts? experices? .. thanx

oh i also lost 150 nm of torque ( all runs have been in 4th gear so there no excuse there) but i know torque is very hard to measure on the dyno

It's summer, hot and you cant compare dyno's at the best of time even the same one on a different day

dude re read my post,

my friend who was dynoed same time as me last time on same dyon pulled more power and he hasnt touched his engine,

ive played with the engine spent a reasonable amount of cash to expect somesort of gain and i lost power when he gained 10 kws from what he did b4 .... that does not add up,

weather conditions have nothing to do with it, as both our dyno;s were on same days and same time in same weather conditions , so its quite clear something is up

dude re read my post,

my friend who was dynoed same time as me last time on same dyon pulled more power and he hasnt touched his engine,

ive played with the engine spent a reasonable amount of cash to expect somesort of gain and i lost power when he gained 10 kws from what he did b4 .... that does not add up,

weather conditions have nothing to do with it, as both our dyno;s were on same days and same time in same weather conditions , so its quite clear something is up


ok then, fuel, oil (thickness), clutch, did you get an air/fuel measurement? Maby's it's rich as **** or to lean, but 10kw gain with ur mate with no mods just proves how unreliable dyno's are and different factors in the atmosphere affect different cars different ways.

Torque is determined my the tyres to....

Does the car feel any quicker than it used to?

It is possible that you have lost peak power as a tradeoff to a wider torque curve. Fuel is also another contributing factor to power loss, as nowadays octane levels in pump gas are extremely inconsistent, unfortunately.

Did you do any general maintenance prior to the dyno run? (ie, air filter clean, spark plugs, oil.. etc..)

As for the loss of 150nm; that kind of loss would be extremely noticeable when driving on the street.. something is definately not right there. Possibly a dodgy readout. Also, did you only do a single run and take that figure?

Theres no real way to keep consistent dyno readouts, unless everything maintainable on the vehicle is kept in its prime... and even then its still reasonably hard to say...

But as Sports is saying... theres just too many variables...

i think regardless of the dyno or weather conditions,

i should be around the same kw number ahead of my mate + the extra power that my mods have made, so if he gained 10 kw's due to the different dyno/weather etc then i shouyld have recorded the same sort of result plus my gains from mods ... so u could look at it that i actually lost about 17 kw's from previous dyno if u look at it like that ....


anyways without getting into nit picky nuymbers that mean nothing, obviously there is something up cos dyno's are unreliable but they aint THAT bad, and im not one to blame the dyno when it dosnt work out my way ... so yeah very curious what the deal was,

i have an emanage but im waiting for my heads to be done so i can get it all tuned atr once, possibly that will reveal my problems

Too many variables stonesour, get it through yer head mate. Your car might respond worse to hotter weather than your mates, or it might not like more humidity in the air. All dynos are different and even the same dyno cannot be compared on a different day as weather conditions play too much of a determining factor in a dyno run. Please read this and understand before making anymore comments.

It could be anything dude. You might be runnin thicker oil, might have dirty plugs, your fuel filter could be clogged (happened on my VS... and a few times on the Magna, haha), heck, even if your air filter is a lil clogged up, I reckon that'd make a difference.

All in all, a variation of 7kw on a dyno is pretty... meh. I've seen cars go on in the morning and make xxxkw's, and they go on again in the arvo and make 10kw's less.

Just because you have added some new things doesnt necessarily mean you are going to gain power from them..

You could have hindered your performance with your extractors and 'custom y pipe' aswell as RPW's inlet manifold..

Also, what mode was the dyno done?


So many varying factors in this..

interesting that tzaboy and cummins went head to head on the dyno's at autosalon end of last year, with their manual ralliarts.. both have unichips but there other mods slighly differ with tzaboy having more mods

cummins is pretty much a standard ralliart with air filter and rear muffler changed (from memory)

tzaboy had (from memory) different extractors, rpw inlet manifold, high flow cat, 2.5" exhaust, pod filter with cai ..

cummins made more power than tzaboy that day (1kw i think it was)

so either some of these expensive mods like rpw's inlet manifold and extractors do absolutly nothing OR dyno's are useless and unreliable?

Just out of curiosity, how do manufacturers agree on what a new model outputs?

If there is so much variance between similar cars and again variance on times of the day etc. etc. for the same car then how the hell would Mitsubishi claim 175kW @ 5250rpm for the 380 :confused:

Also we know that some manufacturers use KW numbers as the model numbers, are they fudging it? :shock:

interesting that tzaboy and cummins went head to head on the dyno's at autosalon end of last year, with their manual ralliarts.. both have unichips but there other mods slighly differ with tzaboy having more mods

cummins is pretty much a standard ralliart with air filter and rear muffler changed (from memory)

tzaboy had (from memory) different extractors, rpw inlet manifold, high flow cat, 2.5" exhaust, pod filter with cai ..

cummins made more power than tzaboy that day (1kw i think it was)

so either some of these expensive mods like rpw's inlet manifold and extractors do absolutly nothing OR dyno's are useless and unreliable?


More likey that. I think to get a true reading, you need a VERY serious dyno machine. Otherwise stuff like (stonesours prob) happens to people.

i think u guys didnt get me,

i relaise there are differences in dyno;s and weather conditons i know all this,

but my friends NA 6 was dyno'd right b4 mine last time and he consitantly pulled 108/107 ... i consitantly pulled 130-127's ....

this time we goit dyno'd together , id expect the number to be different due to a different dyno, but surely the power difference between us would stay true, if anything id gain power on him ...

i read the RPW manifold guarantee's huge gains in torque, and reasonable power gain through the rev range,

i not saying imn disapointed with the number, the number means nothing to me , however as me and my friend have alwayts been dyno'd together u would thinkthe same power difference would remain for became greater in my favour , so what he is pulling is my refernece point not my power figure.. cos i have heard this dyno reads low but i dont much care really

Nah i get what you mean. That the difference should have been similar, regardless of the actual figures. Noticed any major loss of power in the car? Major issues?

it seems faster revs out more but lost more bottom end, basicly shifted the power baand a lil higher up top,


i ges if anything is up graham wests work shop will suss it out when i get my emanage in, but that wont be till after i get my heads in

anyways thnx

it seems faster revs out more but lost more bottom end, basicly shifted the power baand a lil higher up top,


i ges if anything is up graham wests work shop will suss it out when i get my emanage in, but that wont be till after i get my heads in

anyways thnx

As i said to ya awhile back jamie, my car pulled 137Kw's@wheels at last years AMC dyno day (at graham wests) and that was with the bog stock high mileage TJ1 engine (only additions were my extractors/exhaust and my own ecu mapping) in the car.
That @wheel power figure was only 1kw down on what my car pulled on a completely different dyno on a warm day whilst i was remapping the ecu, i was expecting a lot bigger variance from graham west dyno to my uncles dyno but there wasnt.

Just out of curiosity, how do manufacturers agree on what a new model outputs?

If there is so much variance between similar cars and again variance on times of the day etc. etc. for the same car then how the hell would Mitsubishi claim 175kW @ 5250rpm for the 380 :confused:

Also we know that some manufacturers use KW numbers as the model numbers, are they fudging it? :shock:

As far as I am aware the mitsubishi (most manufactures do similar)figures are readings taken on engine dynos.i.e nothing like alternators, air cond belts/units etc hooked up. So even these items will tell a tale on a dyno reading.

As far as I am aware the mitsubishi (most manufactures do similar)figures are readings taken on engine dynos.i.e nothing like alternators, air cond belts/units etc hooked up. So even these items will tell a tale on a dyno reading.

I think they also quote the average minimum power output of that engine series, some engines might produce slighttly more from factory.

i think your inlet manafold makes your car run leaner... im not real sure but a CAI wouldnt make a big differnce unless your on the road? just a thought. take it down the strip and see what time you can get.compare it with your old time

there are no 1/4 mile strip in adelaide that are open these days,

a few ppl from the day had very strange read outs to, some even took their car to their own tunders and the tuners were a bit worried... one NA car that pulled 121 actually got 147 next day... so i think this dyno may have just been all overe place, who knows,

either way when i get my heads done ill get a full tune and any problems will be rectified