BHP Comparison Between Low & High Mileage Cars

[Colin747]

Just as a curiosity, I know engines can lose power through the years so I'm wondering is there any rough rule of thumb of how much power a VQ loses over it's lifetime? Be interesting to see if anyone has a few dyno read outs of their car over time.

Edited February 8, 2017 by Colin747

[Richf]

Go on the dyno sheet thread but some engines are better than others and its not due to mileage

[Ekona]

Absolutely impossible to say, as Rich says some engines differ the second they come out of the factory! Not to mention how different dynos on different days will give different readings.

[Colin747]

Aye, I was grasping at straws that someone would have dyno readings from the one car on the same dyno over time. Guess it was a bit of a long shot haha

[Flex]

If you're bothered purely about HP buy something else.

[Colin747]

Like I said it was just a curiosity...

[coldel]

What was the objective of the question? Are you thinking of buying and wanted to know what the car might truly be running in terms of BHP?

[Colin747]

Nope, I already have one. It was purely academic curiosity.

[coldel]

Various posts across the internet quote 1bhp per year - but hey the internet isn't always right

 

If its has been poorly serviced, ragged, stuck in a bubble in a lock up, wrong fuel, bad oil etc etc will all have an effect on the engine performance over time - the question is unfortunately I think one that drops into this category unless someone has some great insights...

 

[Colin747]

Various posts across the internet quote 1bhp per year - but hey the internet isn't always right

 

If its has been poorly serviced, ragged, stuck in a bubble in a lock up, wrong fuel, bad oil etc etc will all have an effect on the engine performance over time - the question is unfortunately I think one that drops into this category unless someone has some great insights...

 

Thanks, that's pretty much what I was curious about.

[KyleR]

Even if someone owned the car from new and dyno'd it every year for 10 years on the same exact same dyno, it still wouldn't give an accurate portrayal of BHP gain or loss. There are far to many variables that can affect dyno runs by 0.5% here and there from the obvious fuel in the tank, to the not so obvious air pressure and density, it's just not possible to do unfortunately, unless of course the dyno was in a controlled environment and was automatically run by a computer and the fuel was tested before each test.

[rabbitstew]

I remember reading once about (and I think it was Honda) dyno`d a couple of their Fireblade superbikes before competing with them at the TT races and after. The bikes had more power after apparently.

[Jeff E]

If you search Top Gear when they have had to buy old cars they have dyno'd some of them and losses were mostly high.

[davey_83]

Various posts across the internet quote 1bhp per year - but hey the internet isn't always right

 

If its has been poorly serviced, ragged, stuck in a bubble in a lock up, wrong fuel, bad oil etc etc will all have an effect on the engine performance over time - the question is unfortunately I think one that drops into this category unless someone has some great insights...

 

 

Twice as long as it is from the middle x

[coldel]

Thanks for the kiss

[ChrisB]

I remember reading once about (and I think it was Honda) dyno`d a couple of their Fireblade superbikes before competing with them at the TT races and after. The bikes had more power after apparently.

 

I have a similar one. I remember being told by someone back in the 1980's that Porche did a test of two Porches.. both were tested and found even. Then one was ragged most of its life, the other was treated to pampering and barely left the garage. After a while they re tested them back to back. The ragged one was stronger.

 

Now that was a cheery anecdotal tale of two Porches, clouded by distant memory, recanted by some beer assisted bloke (me) off the internet Might be true

[Richf]

If you search Top Gear when they have had to buy old cars they have dyno'd some of them and losses were mostly high.

 

Only in the world of top gear does horsepower magically leak from an engine over time.

[Jetpilot]

I remember reading once about (and I think it was Honda) dyno`d a couple of their Fireblade superbikes before competing with them at the TT races and after. The bikes had more power after apparently.

 

I have a similar one. I remember being told by someone back in the 1980's that Porche did a test of two Porches.. both were tested and found even. Then one was ragged most of its life, the other was treated to pampering and barely left the garage. After a while they re tested them back to back. The ragged one was stronger.

 

Now that was a cheery anecdotal tale of two Porches, clouded by distant memory, recanted by some beer assisted bloke (me) off the internet Might be true

 

I can believe this, I bought a zx9r that was a fast bikes magazine demo bike, it wasnt even run in, spanked from the moment it was first started, by all accounts they dyno tested a few bikes that were released that year when doing a group test later in the year, the zx made more power than the others and more than the manufacturer claimed hp where the others were all a fair bit lower.

 

How long it would last is a different story.

 

The problem with "running in" people take it too literally, i.e dont go above 4k rpm for x, so they dont, in reality you should give it a few revs here and there, you just dont want prolonged high revs.

[Richf]

I follow this break in proceedure , have done for the last 20 years

 

http://www.mototuneusa.com/break_in_secrets.htm

 

All the cars I have run in this way have made more than the factory quoted figures on the dyno

[Rock_Steady]

well, i had a 2005 (11 years old at the time) DE which made 280 @ the fly before my re-map which i was pleasantly surprised about.

[Mark@Abbey m/s]

We have seem 100K+ DE cars making the same power as low mileage cars on our dyno.

 

Also the oil usage doesn't seem to matter what mileage the car has done more to do with how a car is run in I feel as RichF has said above , we prefer to run the cars in our our dyno , hard and fast is the way forward.

[OliverB]

That's heartening to hear! My 07 DE likes oil and has 100k on the clock, sort of dreading dynoing it

[Dangermoss]

If you search Top Gear when they have had to buy old cars they have dyno'd some of them and losses were mostly high.

 

If it was the budget supercar one I'd take what they said with a pinch of salt.

 

The cars were a bit 'tired', could have had all sorts of mechanical issues, vacuum leaks, misfires etc...

 

From memory Clarkson's Maserati wasn't even the model he thought it was.

[davey_83]

Some manufactures dyno test cars straight of the line before it even leaves the door. Seems strange but reads as the norm these days.

 

http://www.autoexpress.co.uk/bugatti/92681/2017-bugatti-chiron-all-the-news-and-info-on-bugattis-new-1479bhp-hypercar

 

With wheels bolted on and fluids filled the car hits a modified dynamometer. After a successful dyno test, the car’s complete body is fitted and it undergoes a leak test, after which work can begin on the interior.

[docwra]

My 21 year old, 180K miles GTI-6 dynoed exactly standard power and 2 lb/ft more than standard torque. If its a healthy engine no reason why it shouldt still do the same as it did when it was a young un