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06 z4 si dyno run 234hp ?

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ph001
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06 z4 si dyno run 234hp ?

Post by ph001 » Wed Sep 26, 2018 10:20 am

You also have to remember that a lot of the, shall we say, less reputable remap places can easily make the dyno figure say anything they want it to say as there are lots of hidden variables you can modify (like gearing and drivetrain losses). So do your first pre-map dyno run, then tweak one of the variables and do your second after the remap. Voila, 20bhp more. Happy customer, happy remap man. Just how hard you strap the car down to the rollers can make up to 15% difference on the result.

A lot of these internet startups are selling copied software maps at £300 a pop. The whole industry has become a bit of a minefield to be honest.

I wouldn't trust anyone that has been around for less than 10 years. Ideally they should have with some motorsport background.

Hub dyno are far less prone to error. It's the only type I would consider using.... http://www.cskdyno.co.uk/html/dynapack.html
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06 z4 si dyno run 234hp ?

Post by Z4 COUPSTER » Wed Sep 26, 2018 12:00 pm

Smartbear wrote: Wed Sep 26, 2018 9:56 am
Z4 COUPSTER wrote: Wed Sep 26, 2018 8:25 am 294bhp with remap? I was under the impression 289 bhp was MAX.
Forgot to add if it's remapped the torque I believe is altered a lot you lose some grunt higher up.
Others who have had done will know more.
D
That doesn’t make any sense? Horsepower is torque x revs, so to lose grunt higher up = loss of horsepower :(
Rob
Torque/BHP Drops off in the higher range I was told on a remap. The torque curve is,altered so you get a bit more lower down the rev range but lose some at the top, where the 3.0si normally peaks. No first hand experience only what I have been told. Not a massive difference but noticeable by all accounts.
D
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06 z4 si dyno run 234hp ?

Post by Pbondar » Wed Sep 26, 2018 1:48 pm

The car main bus voltage will haze zippo difference on BHP if it varies from around 11v to 15v...

As others pointed out losses in the power train will result in a wheel driven dyno, if set up correctly reporting a 10% to 15% loss in rear wheel bhp over crank reported bhp which the manufacturer states as when he runs it, it’s in a test cell with no air con, alternator or other items dragging the power back, let alone, clutch, gearbox, prop shaft, rear diff and wheels.

261 bhp to 234 bhp is 10.5% so you are perfectly normal...

As others say give the long history of people trying to find a quick fix for instant bhp on this normally aspirated car indicates 20bhp is all you can hope for with a simple remap..

Generally exhaust systems for many years have not been shown to be that restrictive, people confuse noise and vibration from re worked exhausts as speed..aka Yamaha FS1E for those that can remember those with a painful tin can exhaust...

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06 z4 si dyno run 234hp ?

Post by ChrisPDuck » Wed Sep 26, 2018 4:11 pm

Spot on pbondar thanks for info after much research today I have found everything you’ve said to be true the S54 engine is the faster n/a engine and after the research on them I’ve found the engine to be set up a lot differently and after thinking of transplant unless you get the engine for nothing and are extremely lucky it would still work out cheaper to buy a Z4M I don’t regret buying my si at all was looking at the VXR and I’m glad I went with BMW Z4 si coupe love the car
Again thanks for the reply and info mate 👍

Pbondar

06 z4 si dyno run 234hp ?

Post by Pbondar » Wed Sep 26, 2018 4:40 pm

:thumbsup:

I also note that on the runs I have been with a wide variety of Z4s of all types that I can’t easily differentiate which engine is the most powerful as the driver has much greater effect than the engine... :driving:

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06 z4 si dyno run 234hp ?

Post by woolybear » Wed Sep 26, 2018 5:53 pm

z4pilot wrote: Wed Sep 26, 2018 10:00 am Can't really help with your question beyond what's already been said, but Aero front on a coupe... :thumbsup:
Ditto, about the question & the Aero front bumper, on your Coupe OP :thumbsup:

Subtle M3 wheels too 8)

Have you pondered, possibly - a pair of Aero side skirts, ChrisPDuck ??

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06 z4 si dyno run 234hp ?

Post by Smartbear » Wed Sep 26, 2018 6:28 pm

Pbondar wrote: Wed Sep 26, 2018 1:48 pm The car main bus voltage will haze zippo difference on BHP if it varies from around 11v to 15v...

As others pointed out losses in the power train will result in a wheel driven dyno, if set up correctly reporting a 10% to 15% loss in rear wheel bhp over crank reported bhp which the manufacturer states as when he runs it, it’s in a test cell with no air con, alternator or other items dragging the power back, let alone, clutch, gearbox, prop shaft, rear diff and wheels.

261 bhp to 234 bhp is 10.5% so you are perfectly normal...

As others say give the long history of people trying to find a quick fix for instant bhp on this normally aspirated car indicates 20bhp is all you can hope for with a simple remap..

Generally exhaust systems for many years have not been shown to be that restrictive, people confuse noise and vibration from re worked exhausts as speed..aka Yamaha FS1E for those that can remember those with a painful tin can exhaust...
How could I forget my first bike? :oops:
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06 z4 si dyno run 234hp ?

Post by Smartbear » Wed Sep 26, 2018 6:31 pm

Z4 COUPSTER wrote: Wed Sep 26, 2018 12:00 pm
Smartbear wrote: Wed Sep 26, 2018 9:56 am
Z4 COUPSTER wrote: Wed Sep 26, 2018 8:25 am 294bhp with remap? I was under the impression 289 bhp was MAX.
Forgot to add if it's remapped the torque I believe is altered a lot you lose some grunt higher up.
Others who have had done will know more.
D
That doesn’t make any sense? Horsepower is torque x revs, so to lose grunt higher up = loss of horsepower :(
Rob
Torque/BHP Drops off in the higher range I was told on a remap. The torque curve is,altered so you get a bit more lower down the rev range but lose some at the top, where the 3.0si normally peaks. No first hand experience only what I have been told. Not a massive difference but noticeable by all accounts.
D
294bhp doesn’t back up “losing some of the top” as it’s considerably more than standard :thumbsup:
Rob
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e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold

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06 z4 si dyno run 234hp ?

Post by ChrisPDuck » Wed Sep 26, 2018 7:15 pm

Thanks woolybear I have considered them probably will go for them, thinking of upgrading the brakes to for 4 pot calipers m sport only because of the caliper sticking rebuilding then sticking again so I read and seem to keep seeing it pop up on topics depends on if they fit and I can fit the 340mm disc

Pbondar

06 z4 si dyno run 234hp ?

Post by Pbondar » Wed Sep 26, 2018 7:21 pm

Smartbear wrote: Wed Sep 26, 2018 6:28 pm
Pbondar wrote: Wed Sep 26, 2018 1:48 pm The car main bus voltage will haze zippo difference on BHP if it varies from around 11v to 15v...

As others pointed out losses in the power train will result in a wheel driven dyno, if set up correctly reporting a 10% to 15% loss in rear wheel bhp over crank reported bhp which the manufacturer states as when he runs it, it’s in a test cell with no air con, alternator or other items dragging the power back, let alone, clutch, gearbox, prop shaft, rear diff and wheels.

261 bhp to 234 bhp is 10.5% so you are perfectly normal...

As others say give the long history of people trying to find a quick fix for instant bhp on this normally aspirated car indicates 20bhp is all you can hope for with a simple remap..

Generally exhaust systems for many years have not been shown to be that restrictive, people confuse noise and vibration from re worked exhausts as speed..aka Yamaha FS1E for those that can remember those with a painful tin can exhaust...
How could I forget my first bike? :oops:
F71232C7-107A-4D34-89EF-960135A5EB39.jpeg
Rob
Holy s**t...it was you! :rofl:

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06 z4 si dyno run 234hp ?

Post by Lazza » Wed Sep 26, 2018 10:20 pm

Could it be that the lower before figure was at the wheels and the after higher figure was calculated at the flywheel figure? That would make it roughly right.
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06 z4 si dyno run 234hp ?

Post by earthdweller » Thu Sep 27, 2018 8:36 am

Pbondar wrote: Wed Sep 26, 2018 4:40 pm :thumbsup:

I also note that on the runs I have been with a wide variety of Z4s of all types that I can’t easily differentiate which engine is the most powerful as the driver has much greater effect than the engine... :driving:
Very true Peter, in the real world there is very little difference in performance of the various models

Looking forward to leaving you in my smoke in the Trossachs :rofl: :thumbsup: :driving:
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Pbondar

06 z4 si dyno run 234hp ?

Post by Pbondar » Thu Sep 27, 2018 10:05 am

earthdweller wrote: Thu Sep 27, 2018 8:36 am
Pbondar wrote: Wed Sep 26, 2018 4:40 pm :thumbsup:

I also note that on the runs I have been with a wide variety of Z4s of all types that I can’t easily differentiate which engine is the most powerful as the driver has much greater effect than the engine... :driving:
Very true Peter, in the real world there is very little difference in performance of the various models

Looking forward to leaving you in my smoke in the Trossachs :rofl: :thumbsup: :driving:
You should get your rings sorted if you are leaving that much smoke.. :thumbsup: :rofl:

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06 z4 si dyno run 234hp ?

Post by earthdweller » Thu Sep 27, 2018 10:24 am

Pbondar wrote: Thu Sep 27, 2018 10:05 am
earthdweller wrote: Thu Sep 27, 2018 8:36 am
Pbondar wrote: Wed Sep 26, 2018 4:40 pm :thumbsup:

I also note that on the runs I have been with a wide variety of Z4s of all types that I can’t easily differentiate which engine is the most powerful as the driver has much greater effect than the engine... :driving:
Very true Peter, in the real world there is very little difference in performance of the various models

Looking forward to leaving you in my smoke in the Trossachs :rofl: :thumbsup: :driving:
You should get your rings sorted if you are leaving that much smoke.. :thumbsup: :rofl:
I clear my ring out about 8 every morning ... oh wait !

Wrong ring :rofl:
07 3.0si Sport Roadster Titanium Silver/Syrah Blue Individual Leather, CSL reps ZHP

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