Sport Button

R

ronk

Lifer
 Durham
I had my E85 for three years and was never really sure what the sport button did apart from load up the steering - However I sold the car to a friend and he was offered the chance to put the car onto the dyno and I went along as an interested observer.

The first run showed 203 BHP and a subsequent run with the sport button armed showed 221BHP

You fellas with E85 get those buttons pressed :thumbsup:
 
If I hadnt seen it with my own eyes I wouldnt have believed it either!!!!

They were back to back runs and the BHP reading was in figures ie Not being read from a graph!

I was equally shocked.

Should have said it was my old E85 3.0 (N52) I am just hoping that my E89 in Sport mode does the same and that the outfit is a reputable organisation - Certainly not a cowboy outfit trying to flog an upgrade or remap etc :thumbsup:
 
i know it makes the throttle response a lot sharper.

if you press halfway down with the sport button off, and press it while still holding the throttle half way down, you can feel the kick, as if it has given you more power. but i assume it's just because you require less pressure on the throttle to get the same affect, with sport on.

unsure if that makes sense, sounded better in my head :?
 
203 would have meant it had lost 25 horses somewhere along the way,weird. I use it all the time on my E89 because it sharpens the throttle response noticeably but on neither model is it supposed to deliver maximum BHP compared to normal.
 
The BHP is measured at the wheels - The figure quoted by the manufacturer is at the crank(I gather front wheel drive cars loose more power thro the transmission)
Hence the loss of power.
As I said earlier I thought it just firmed up the steering and sharpened the throttle response - but I know what I saw! Nothing else changed between runs - I have no interest other the fact its my old car. I was gobsmacked

I saw the numbers - I think I will take my E89 to have it tested.
 
I'm not doubting your eyes but that can only be down to some sort of freak occurrence, or even a problem with the car in question. The sport button only affects throttle response and steering (on a manual anyway - I believe in an auto it delays gear change).
 
Those figures cant be at the wheels mate... 221bhp @ wheels would be around 275bhp @ fly which is way to much (assuming the car is standard).
FWD cars have less transmission losses than RWD or 4WD, no prop shaft, transfer box, etc.
 
Dont shoot me I'm only the messenger!


He didnt take the engine out either - so the figures I quoted were at the wheels - I can assure you that neither the garage nor I have any axe to grind - I went along to observe the process as I have never seen it before.

Can I ask if any of you doubting thomases had your cars on dyno? :P
 
ronk said:
Dont shoot me I'm only the messenger!


He didnt take the engine out either - so the figures I quoted were at the wheels - I can assure you that neither the garage nor I have any axe to grind - I went along to observe the process as I have never seen it before.

Can I ask if any of you doubting thomases had your cars on dyno? :P
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The engine does not come out to be given fly wheel figures mate, the dyno will calculate transmission losses... Here in the UK 99.9% of dyno figures given will be calculated @ the fly unless you specify you want @ the wheels.
I've had many cars dyno'd over the years yes, my Z will be too once the turbo conversion is complete.
 
The dyno will of course "calculate" it cannot measure and as such some parameters can only be guestimates (sic) I do accept what you said that the figure the machine spat out may have been internally calculated but whichever they were thats the figures that it supplied.

The technician says that roller dyno figures should really be treated as a baseline to show changes when tuning.

Manufactures measure the engine performance in a dedicated cell - otherwise there a too many variables.
 
Some dyno's meassure transmission losses on run down but this is still not 100% accurate (better than nothing though), but an engine dyno as the manufacturer uses is the only way to get a 100% accurate fly wheel figure.
I don't really know why here in the UK we all talk about fly wheel figures when in the real world it's wheel HP that makes the difference in performance on the road/track... One of the few things the yanks actually do right! :P lol
 
Bigger numbers = Bragging rights down the pub!

Thats why the quote the figure as
HP not Kw
Nm not Ft/lbs
 
Was it done on single runs or over 3 averaging? Which gear was it in? There are too many factors with Rolling roads to get a conclusive result.
 
Three runs, I dont know what gear. I saw 6.5k RPM and I do know that the traction / DSC was switched off .
 
Not mine - fellow forum member. Dont think sport can affect bhp, as it adjusts only the throttle mapping. So at any given position of accelerator travel, the pick up and throttle opening/fuel injection increases at a higher rate. However, flat out is still flat out. Sport doesn't provide more combustion at full throttle.

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That was the sort of numbers shown with sport button on. Low 200's with sport off.

Like you I didnt think it made any difference - wide open is wide open but the change suggests to me that there is another map in there.

As I said the fella only put my mates car on the rollers to let both him and me see it in action. There was no charge either - He really had no reason for any bullshit and it is no hick outfit.

I think I will try and get a copy of the runs.
 
hype said:
I'm not doubting your eyes but that can only be down to some sort of freak occurrence, or even a problem with the car in question. The sport button only affects throttle response and steering (on a manual anyway - I believe in an auto it delays gear change).
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Correct as I can testify. It transforms the car into a completely different animal in the auto.

Driving in Normal Mode feels like it's an ordinary car, well as ordinary as a 3 litre stright 6 Zeddy can be. Switch it to Sport Mode and the response is instant, the box drops a cog and kinda behaves like you've hit the kickdown when you haven't. Great fun :driving:
 
Goes to show how even two runs on a roller can have variances... I've never done a rolling road (too scared after watching Youtube videos :( ) but have heard mixed results.

A few people I know swear blind that chipping their (non turbo) car gave 20-30bhp results. Going by your results, the real gain from the chip was maybe 2bhp, which makes more sense
 
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