[Perm]

I know this has been covered before but what do you all feel about this warning from BBR about rolling road testing ?

Quote taken from the BBR web site.

…..And a word of of warning, stay off power testing on rolling roads! No fan (other than a wind tunnel fan) has the ability to cool the air through the intercooler "put your hand out of a car window at 100MPH see if you can find a fan that has the same effect?" We have been advising our customers since the mid 80's (Cosworth days) to stay off power testing on rolling roads. They do more damage than you can believe, since it's impossible to keep the inlet charge temperature at a safe level! We have seen countless damaged engines all down to reckless power testing on the rolling roads! You have been warned!
Note for Cooper S pre 2005 model owners with supercharger pulley reductions:
We have noticed without exception due to the extreme heat induced on so called "power runs" on rolling roads, Cooper S owners are over heating the coat applied to the rotors within their earlier type Eaton supercharger unit. This causes delaminating and flaking away of the Eaton rotor coating, a loss of efficiency within the supercharger (loss of seal) therefore reducing boost pressure and airflow! This will cause a loss in power, but more importantly the delaminated coating has nowhere to go other than into your intercooler (further restricting air flow!) or even worse with smaller parts straight through into your engine!

BBR do not recommend these rolling road "power runs" on forced induction engines (see Brodie Report), but we would like to warn and prevent our customers, and all other Cooper S owners from unnecessary damage to their supercharger units and potential long term damage to their engines! "You have been warned."

[Jaw_F430]

I had this thought in mind when I took my car on a rolling road but having the laptop plugged in and monitoring the inlet temp made me feel better. After doing the power runs the bonnet was lifted and I put my hand on the intercooler and it was cold. When sat in traffic the intercooler gets really hot so this would damage your engine too if it was true as you temp would stay high until you get to open roads?maybe someone could back this up or explain different?

So I have change my opinion on power runs, only time will tell if there is any long term damage but with the amount of people that have it done and I don't know of anyone so far that has damaged their enigne.

Just remember to check fluid levels before dynoing

Regards


James

P.S There is only one reason why a tuner would tell you not to dyno your car that I can think of

[Perm]

Quote: Originally Posted by Jaw_F430 (original)

.....
P.S There is only one reason why a tuner would tell you not to dyno your car that I can think of

Hi,
I am tempted to get my car dynoed however I am not expecting great figures as I would expect that with a 19% pulley I would not be able to get the inlet temp low enough to show the "true" power of the car. I think it is for this reason that a 15% reduction pulley dynos better than 17% or 19% reduction pulled cars....

Perm

[Jaw_F430]

Quote: Originally Posted by Perm (original)

Hi,
I am tempted to get my car dynoed however I am not expecting great figures as I would expect that with a 19% pulley I would not be able to get the inlet temp low enough to show the "true" power of the car. I think it is for this reason that a 15% reduction pulley dynos better than 17% or 19% reduction pulled cars....

Perm

If you are going to get it dynoed then do it now why the weather is nice and cool will help your inlet temp.

But at the end of the day is it how the car drives and pulls that matters, a smile is on my face everytime I drive my MCS so the dyno just gives bragging rights!!

Regards


James

[stu(pid)]

Perm, I take it your car is a pre 2005 so does not have the coated supercharger rotors?

[Perm]

Quote: Originally Posted by stu(pid) (original)

Perm, I take it your car is a pre 2005 so does not have the coated supercharger rotors?

Stu,
yep, car is a 2003 model. ( just done 59,000 miles of which 47,000 have been done post conversion...... ) ; still pulls like a train

Perm

[MINI-Morgan]

First thing I will say in your case is unless they have a massive fan then walk away. I do think it might be hard work keeping your 19% cool on a normal dyno fan. Maybe take a spray bottle that does fine mists then spray it into the intercooler just before you do a run.

I would say monitor the IATs but that is only a very basic guide as the temps often change faster than can be recorded by ODB and the sensor isnt instant.

Keep it cool and I hope you get a good result. Dont forget HP will only be good for the pub...... the torque is what makes you think it pulls like a train

[GRSmotorsport]

Quote: Originally Posted by MINI-Morgan (original)

First thing I will say in your case is unless they have a massive fan then walk away. I do think it might be hard work keeping your 19% cool on a normal dyno fan. Maybe take a spray bottle that does fine mists then spray it into the intercooler just before you do a run.

I would say monitor the IATs but that is only a very basic guide as the temps often change faster than can be recorded by ODB and the sensor isnt instant.

Keep it cool and I hope you get a good result. Dont forget HP will only be good for the pub...... the torque is what makes you think it pulls like a train

Dave is spot on, only choose a rolling road that has good cooling fans. My cars spent many hours on the rolling road for testing, with no ill effects. Most of the rolling road sessions were with a grey coated super charger, but fitted a black coated version for the extra power I have.

[Perm]

many thanks for all your input.....
I think I will listen to your good advise and listen to BBRs warning and leave the dyno rolling roads for others......

Cheers
Perm

[stu(pid)]

...and spend the saved cash on?????

[DaFlake]

Beer...

[humph]

Quote: Originally Posted by DaFlake (original)

Beer...

....No point going to the pub though. He's got no bhp figures to brag about

Sorry couldn't resist.

[DaFlake]

Quote: Originally Posted by Humph (original)

....No point going to the pub though. He's got no bhp figures to brag about

Sorry couldn't resist.

Do what I do.... Lie....

Yeah, my MINI gets 300whp!

[minigolf]

Quote: Originally Posted by Jaw_F430 (original)

P.S There is only one reason why a tuner would tell you not to dyno your car that I can think of

That thought crossed my mind as well. :P

Quote: Originally Posted by Jaw_F430 (original)

...But at the end of the day is it how the car drives and pulls that matters, a smile is on my face everytime I drive my MCS so the dyno just gives bragging rights...

Well said!