Dyno'd car, SS very underpowered compared to Holden's 270kw claims

[talljoe]

Dyno'd my car at 207rwkw for a manual SS ute.

Assuming 15-18% drivetrain loss that's 243kw - 252kw at the flywheel. Almost 27kw down from Holden claims for 15% case.

I got it tuned to 235rwkw thereafter (with CAI from Walkinshaw), which puts it at 277kw for 15% loss.

Are my drivetrain losses not conservative enough or are Holden putting out shitty engines?

[GEN3RATD]

sounds about right.

[Bradbd]

Might be wrong but as a comparison I thought the 195kw SV6's Dyno at ~140rwkw

[GEN3RATD]

its not uncommon for cars to dyno tune well under what holden claim.

fords are the same

[UFO]

Assuming 15-18% drivetrain loss....

I think here's the problem. I doubt Holden are out by 27Kw, and instead I reckon your allowance for drivetrain losses is a tad light. I'd say 10-15% for Fwd's, and at least 20% for Rwd's... 4wd's of course even more. But again, this is all very generalised and depends on each car. But I reckon the VE is losing at least 20%... and then that depends on which variant as well, because I would think drivetrain losses would be static figures and not percentages.

[MathoSSV]

Use the search button mate been covered plenty of times

Firstly a chassis dyno is primarily a tuning tool, and figures are very variable depending on dyno, operator etc

Secondly, the percent of drivetrain loss is actually around ~20% on a manual VE SS, with ~215rwkw being the most common dyno readings

Mine made ~215rwkw, series 1 man SSV ute on a mainline dyno, you will find the dyno dynamics dyno's tend to read a bit higher and also the series 2 engines put out slightly less than series 1 due to the DOD technology (L77)

Octane rating of the fuel used is also important, using 98Octane fuel will yield higher numbers than 91 or 95

Ultimately a few kw at peak power is not important, it is more about the graph itself, where the car makes power and torque etc

[pjdm1980]

It also depends on air temp, humidity, the dyno itself and lots more issues as mentioned.

[RUF-60L]

Yeah first question to be asked...what type of dyno was it???

[The pig]

Also depends on wheel diametre and tyre pressures other than anything else thats mechanical, holden make ok engines all car manufacturers claim this and that but its al claimed power only way to prove it is drive and/ or dyno it id never beleive manufacturers claims they just want their cars sold their a bit like politicians promise this claim that.

[Munz]

Dyno'd my car at 207rwkw for a manual SS ute.

Assuming 15-18% drivetrain loss that's 243kw - 252kw at the flywheel. Almost 27kw down from Holden claims for 15% case.

I got it tuned to 235rwkw thereafter (with CAI from Walkinshaw), which puts it at 277kw for 15% loss.

Are my drivetrain losses not conservative enough or are Holden putting out shitty engines?

joe those figures are low in my opinion can you post your dyno sheet? if not what gear was it run in? and state what other mods you've done ie zaust/xtractors

[dirt drifter]

u never know ya tuner could have stuck the air temp sensor in an icy cold coke can he just dug out of the freezer! (to get a lower reading) wouldnt be the first time a tuner has done tricks to fudge dyno figures.

mainline dynos are known to read lower than a dyno dynamics dyno too

[maka5]

Dyno'd my car at 207rwkw for a manual SS ute.

Assuming 15-18% drivetrain loss that's 243kw - 252kw at the flywheel. Almost 27kw down from Holden claims for 15% case.

I got it tuned to 235rwkw thereafter (with CAI from Walkinshaw), which puts it at 277kw for 15% loss.

Are my drivetrain losses not conservative enough or are Holden putting out shitty engines?

Relax...Most probably the dyno. Thats all. Most likely Holden didn't stuff up the figures, Most probably nothing wrong with your car/drivetrain losses. and no they are not a shitty engine.
Its just numbers mate. 238rwkw is what my car puts out on my tuners dyno (1 7/8 headers + 5" cats, 3" s/s catback, OTR and Tune) < yes!!! i kno its fuc##ng low. My point is that dynos vary a lot and the number doesn't really mean much, its the gain thats important (before and after mods)
As long as the car goes good and feels good to you and nothing else matters.

[Vt_vic]

its not uncommon for cars to dyno tune well under what holden claim.

fords are the same

fords are weird man my brothers 270kw fg xr6t was 230rwkw stock

[tomholzy]

fords are weird man my brothers 270kw fg xr6t was 230rwkw stock

thats wierd...
you dont think that it might be because it has a totally different engine, transmission, driveline, diff, wheels, etc?

[macca33]

No, it is because Ford have been UNDERquoting their outputs for a significant time - I cannot for the life of me think why, but they have been.

To the OP, there are too many variables with different dyno, operators, how it was strapped, etc, etc. However, after your mods you made 28rwkw, which is decent in anyone's book.

cheers

[Vt_vic]

No, it is because Ford have been UNDERquoting their outputs for a significant time - I cannot for the life of me think why, but they have been.

To the OP, there are too many variables with different dyno, operators, how it was strapped, etc, etc. However, after your mods you made 28rwkw, which is decent in anyone's book.

cheers

you'd think they might sell more cars if they advertised their true figure the fg xr6t should be around 300kw or so

[UFO]

you'd think they might sell more cars if they advertised their true figure the fg xr6t should be around 300kw or so

nup.... still fugly.

[Sabbath']

Seen plenty of standard manual SS's dyno at around the 200rwkw mark.

[Reaper]

Dyno'd my car at 207rwkw for a manual SS ute.

Assuming 15-18% drivetrain loss that's 243kw - 252kw at the flywheel. Almost 27kw down from Holden claims for 15% case.

I got it tuned to 235rwkw thereafter (with CAI from Walkinshaw), which puts it at 277kw for 15% loss.

Are my drivetrain losses not conservative enough or are Holden putting out shitty engines?

I had always thought it was around 25-30%. The guy at Autotechnique said most of them were just over 200kw from the factory at the wheels which would make yours about right.

There are also a lot of variables when it comes to chassis dyno's. To some extent you can make them read what you want. What is important is the relative difference before/after the tune by the same operator using the same equipment on the same day.

Reaper

[talljoe]

I'm not unhappy with the tune / CAI at all - $1500 from Powertorque engines at Brendale, QLD, for a fairly good gain (and you get a drivetrain warranty).

I'm just a bit annoyed with Holden for making it underpowered to begin with. If they had marketed it as a 250kw car I wouldn't be annoyed.

I forgot to mention one thing - it was tuned on E85 ethanol in the tank, not sure if that added or subtracted from initial power reading - my thoughts would be higher octane, therefore added. Powertorque advised me they'd given it a tune for 98 octane, so if I were to go and dyno it today (full of 98 octane) it would be more powerful.

[RUF-60L]

still havent told us what dyno

[bonners]

we have seen SS Commodores dyno at under 200rwkw...

It can depend on so many things. I have understood to expect to lose 20-30% through the drivetrain

[monkeys437]

I'm not unhappy with the tune / CAI at all - $1500 from Powertorque engines at Brendale, QLD, for a fairly good gain (and you get a drivetrain warranty).

I'm just a bit annoyed with Holden for making it underpowered to begin with. If they had marketed it as a 250kw car I wouldn't be annoyed.

Your not getting what people are saying, holden haven't overquoted your cars power, your power figures are about right. You could potentially chuck it on another dyno and get 195rwkW, 220rwkW or any other number. Its only an indication of measured power taken with a particular instrument on a particular day.

[Munz]

I'm not unhappy with the tune / CAI at all - $1500 from Powertorque engines at Brendale, QLD, for a fairly good gain (and you get a drivetrain warranty).

I'm just a bit annoyed with Holden for making it underpowered to begin with. If they had marketed it as a 250kw car I wouldn't be annoyed.

I forgot to mention one thing - it was tuned on E85 ethanol in the tank, not sure if that added or subtracted from initial power reading - my thoughts would be higher octane, therefore added. Powertorque advised me they'd given it a tune for 98 octane, so if I were to go and dyno it today (full of 98 octane) it would be more powerful.

Joe what gear was it tuned in its on the bottom of the dyno sheet
and tell me where your getting E85 in brissy

still havent told us what dyno

PT have mainline

[walesy]

i say stop worrying about dyno figures and take it to the track... everyone always worrys about KW/HP... what about torque and 1/4 times? timeslips dont lie... there is way too many variables with dynos...

for example a guy i know owns an VH SL/E 355 with only 260rwhp yet it hoses cammed LS's that claim to have 100hp more at the wheels