3.0Si Coupe Rolling Road session

[skelters]

You would be surprised how much new oils, filters and a fuel cleaner will make. Can't remember the name of the show on tv but with a 15 year old 2.0L golf they gained 15hp with all those changes. So with the extra power we have you could see that getting it back to 265hp. Also as previously stated your might have come out of the factory with less anyways.

Check with the BMW garage to see what was done.

Start with the fuel and run a few tanks of Super Unleaded through it.

Get any errors checked that it may be throwing up too.

Although you need to remember it is a Coo Pee and they're notoriously heavy and not very good with that tin roof. Should probably have bought a Roadster.


Found this on the YouTube a couple of weeks ago showing the BHP gains in a service and using additives.

Biggest gains were through a good service.

[youtube]WQN-0zvZNbY[/youtube]

 

[Z43.0Si]

An interesting video, thank you.

Not entirely comfortable using fuel system cleaners but will look into it.

The car has always only ever been run on Shell V-Power.

P.S I'm ignoring your comment on it being a Coupe lol.

 

[skelters]

Wouldn't use the fuel cleaners at all!

Change the fuel for a couple of tanks then go back to Shell.

I use BP Ultimate and every month or so put a tank of Tesco 99 in then back to BP

 

[mr.tourette]

In correction to my previous post, the 246.1 BHP figure will be at the flywheel then and not at the wheels. So down on the standard figure of 265 BHP

Pretty sure most dynos measure power at the wheels...I stand to be corrected though

 

[VRSteve]

Power is measured at the wheels.

The car is allowed to "run down" and resistance is measured to equate the power lost in the transmission.

This gives a "corrected" power output at the fly.

 

[Darkangelv2]

My thoughts are with the induction kit, something tells me it's having a detrimental effect?

The car has a Cat back Supersprint exhaust as well but I imagine if anything this would help and not hinder?

This.

Our cars use a ram air style induction which means to get any gains from induction you have to go way overboard in size to make up for the loss of the ram effect (hence the existence of CSL style intakes).

Assuming the exhaust is more free-flowing, this will only assist if there is more flow required. Given the induction system, it probably isn't, therefore the exhaust may not be offering sufficient back pressure which could actually be detrimental too.

Food for thought at least.

 

[Marlon]

Makes me wonder what's the point of paying £50 for a Dyno test if the results are so variable :thumbsdown:

 

[mr.tourette]

Makes me wonder what's the point of paying £50 for a Dyno test if the results are so variable :thumbsdown:

yep...only useful really for remapping purposes or measuring before and after mods

 

[bluestreak56]

Nobody has mentioned this is a 57 plate car with 47k miles on the clock. I'm no expert but wear and tear on non-serviceable parts will always degrade performance over time. If you think back to the Top Gear challenger buying used performance cars for the price of a new one (£7k) both Hammond and Clarksons cars had lost a huge amount of horses.

http://www.topgear.com/videos/jeremy-clarkson/new-vs-used-part-12-series-17-episode-3

There are loads of discussions online about this. The mileage is low and so most of the parts should be decent, but other factors are also at play. Has it been outside for a lot of its life? Environmental factors will play a part.

Alot of the comments online say an engine is at its prime between 10k and 30k miles. After which it will begin to degrade. Others say if its serviced properly it shouldnt see degradation till 100k plus.

IMHO it depends on the individual car and its personal experiences throughout its life.

 

[Ed Doe]

Power is measured at the wheels.

The car is allowed to "run down" and resistance is measured to equate the power lost in the transmission.

This gives a "corrected" power output at the fly.

Which is why how hard the car is strapped down will significantly affect the measured 'transmission loss'. If it's ratcheted to hell, it'll have a much higher tranny loss.

And yes as has been said already - an open cone will be shocking, even more so for a dyno run where you don't have anything like the representative airflow/temperature as when you're driving along at whatever speed on the road....

 

[Z43.0Si]

Thank you all for your replies, some good info and points of view on this.

I wanted to put the car on a rolling road to give me an indication of how well it's running with the current setup etc. The debate for me now is, do I go back to a standard filter housing and panel filter or not?

 

[Ed Doe]

It's up to you - if you like the noise I highly doubt you'd notice the loss in power driving it on a daily basis particularly, and if you'd not gone and got a power figure, how much would you care?

I personally prefer exhaust sound to induction,so from that perspective I'd put the OEM intake back on, but it's horses for courses

 

[bmwZ]

Double thread

 

[bmwZ]

This is my dyno sheet:
It shows before and after SC intall.
Car is a 3.0Si Coupe with approx 40k miles.
It gave 224 at the wheels stock. With a drivetrain loss of 15% its very close the the claimed 265PS

 

[Z43.0Si]

Ed Doe - my point is, I actually believe I'm loosing some power by having the AFE induction kit fitted, not gaining.

bmwZ - that must be a handful to drive!!

 

[enzed4]

Wouldn't use the fuel cleaners at all!

Change the fuel for a couple of tanks then go back to Shell.

I use BP Ultimate and every month or so put a tank of Tesco 99 in then back to BP

Only one exception I'm aware of - BG44K. This product seems to be the only one that does what it's supposed to (ie, not just 'snake oil')
https://www.bgprod.com/catalog/gasoline-fuel-system/bg-44k-fuel-system-cleaner/.
Can't seem to find it here in NZ, so not speaking from experience, but going on recommendations on other Z4 forums.

 

[nfbr]

Funny things that I've seen on our dyno at work:
1) 17bhp gained by correctly inflating the tyres on the driven wheels
2) 15bhp gained by removing ill fitting carpet mats
3) rear tyres on a 964 Turbo delaminating
4) 9bhp lost over two days as one was cold, the other was warm.
5) Cosworth owners claiming at least 400bhp and walking away with a graph showing less than 270bhp.

Dynos are fun!

 

[Darkangelv2]

Funny things that I've seen on our dyno at work:
1) 17bhp gained by correctly inflating the tyres on the driven wheels
2) 15bhp gained by removing ill fitting carpet mats
3) rear tyres on a 964 Turbo delaminating
4) 9bhp lost over two days as one was cold, the other was warm.
5) Cosworth owners claiming at least 400bhp and walking away with a graph showing less than 270bhp.

Dynos are fun!

**Runs outside to throw away carpet mats and pump up tyres**

 

[Ed Doe]

Funny things that I've seen on our dyno at work:
1) 17bhp gained by correctly inflating the tyres on the driven wheels
2) 15bhp gained by removing ill fitting carpet mats
3) rear tyres on a 964 Turbo delaminating
4) 9bhp lost over two days as one was cold, the other was warm.
5) Cosworth owners claiming at least 400bhp and walking away with a graph showing less than 270bhp.

Dynos are fun!

**Runs outside to throw away carpet mats and pump up tyres**

:lol:

 

[Z43.0Si]

Still not sure about what to do about the induction kit?
Is it best to remove it and go back to the standard housing with a panel filter in terms of performance? Really undecided about this. :|