Some of you know I have a 1.8 Focus Zetec. Recently went on a Dyno to see what it could do. FIgures came back as having 127bhp and 133 Torque. Standard bhp is just 113!!! Thats just with a panel filter.
Last night I stuck in the ST170 snorkel and an air deflector. Took it out for a spin and I can feel even more difference in the puling away!
I'm quite happy!
When you say a dyno.. do you mean a proper engine dyno or a rolling road? Because rolling road figures are well.. inaccurate to say the least. They're fine for providing an idea of improvement if you use the same one, i.e run it again now you have the ST170 snorkel etc and see if that's made any difference.
But for comparing it to factory figures.. nah, sorry.
Not wanting to dampen your chips but I can't see a panel filter making that difference over standard. I've a mk5 Fiesta Zetec-S and a K&N filter gives you little, let alone 14HP difference.
It's more likely the rollers are inaccurate, coupled with a degree of latitude in how good an individual engine is. The ZSs have good and not so good ones, plus the story of Ford declaring less power to reduce its insurance group.
All contributes to the standard figure and a roller result sometimes having a distance between them.
The key thing is if it feels better and you enjoy it. How much did your insurance change when you declared the mods?
Was a rolling road at Power Engineering. I know figures vary from Dyno to Dyno etc. But it was a ballpark figure anyway, but I am happier with the cars performance.Originally Posted by Lowe
When you say a dyno.. do you mean a proper engine dyno or a rolling road? Because rolling road figures are well.. inaccurate to say the least. They're fine for providing an idea of improvement if you use the same one, i.e run it again now you have the ST170 snorkel etc and see if that's made any difference.
But for comparing it to factory figures.. nah, sorry.
Some people notice the difference with a panel filter, others don't which is also why I upgraded the snorkel as well. If anything it improves it slightly, plus you don't have to fork out for a new air filter every now and then.
As long as it makes you happier it's money well spent)
Yep... welcome to the Dyno lottery
ive had results that hugely vary.. from 149bhp from my std at the time 130tdi
and anything between 168-192bhp when tuned. (and conveniently my result dropped 20bhp when the RR-tuner in question brought out their own product)
*most* manufacturers tend to quote a low figure, taking into account things like ambient temp and fuel quality... eg most VW group engines have more poke than specified..
but also alot of Reno Clio 182's are nowhere near that... ive seen some get less than 170 on a dyno.
Also bear in mind the figure at flywheel (your 127bhp) is calculated, not measured.
ie tyre pressures, temps etc can all affect the ATF figure.
the only way to "compare" rolling road figures is ATW figures.
And even thats hugely inaccurate. You cant compare ATW figures from a car dynoed in the winter to one dynoed in the summer for instance.......
"In a perfect world... spammers would get caught, go to jail, and share a cell with many men who have enlarged their penises, taken Viagra and are looking for a new relationship."
A: Take car to long, straight bit of road, roll along at 20mph in 2nd and then gun it up to 60 with a passenger and a stop watch. Do 10 times in both directions and see what the time is. Calculate average. That way yuo have no wheel spin and gear changes get evened out over 10 attempts. DO IN BOTH DIRECTIONS for gravity and wind speed variations.
B: Replace filter with original by the road side on the same day, and repeat immediately.
Real world performance is the vital area.
Rolling roads are worse than reading Parkers Guide for any serious information, but as the lads all say, they're dead good for comparing like-for-like on the same set of rollers.
Which is why you should get a compensated SAE reading too. This takes into account temperature, air pressure etc. This calculates (if memory serves) the bhp at 20c and 1000mb pressure. That is the figure (atw) you need to go by when comparing mods and alterations.
Last time I was down there all the cars where between 5 and 10 up on book. Best use for rolling roads is side by side comparison.
SAE otherwise known as american bull**** BHP.Which is why you should get a compensated SAE reading too. This takes into account temperature, air pressure etc. This calculates (if memory serves) the bhp at 20c and 1000mb pressure. That is the figure (atw) you need to go by when comparing mods and alterations.
European dynos calculate DIN BHP at the fly. SAE is the theoretical power the engine would produce with no ancilliaries connected etc e.g. alternator, water pump etc.
DIN flywheel figures are the ones you get from any dyno in the UK. They also take into acount air pressure, temp etc and give you a theoretical figure at standard temperature and pressure. More accurate than SAE any day.
"In a perfect world... spammers would get caught, go to jail, and share a cell with many men who have enlarged their penises, taken Viagra and are looking for a new relationship."
I stand corrected, but that's the one I meant lol.
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