I'm in a flap - Page 2

**glendog74** · 17-08-2010, 07:38 PM

Quote:

Originally Posted by Dan

Am I missing something or is there actually any point in running the flap? What's it's advantage when it's working?

The flap was primarily fitted to satisfy noise regs. Has no effect on outright power.

**shimmy** · 17-08-2010, 07:42 PM

Quote:

Originally Posted by Dan

Am I missing something or is there actually any point in running the flap? What's it's advantage when it's working?

As far as we all know it was put in for noise reasons. Original prototype CSL didnt have one. It just limits air flow at lower revs and reduces therefore BHP 0-30 bhp over the range it doesnt open compared when sport is pressed

**shimmy** · 17-08-2010, 07:43 PM

Quote:

Originally Posted by glendog74

Has no effect on outright power.

a faulty flap reduces power for part of the range

Dan · 17-08-2010, 07:43 PM

Quote:

Originally Posted by glendog74

The flap was primarily fitted to satisfy noise regs. Has no effect on outright power.

So no increase in power at all when open then?

**shimmy** · 17-08-2010, 07:48 PM

rstoughy · 17-08-2010, 07:55 PM

Dan,
What i noticed last night was not so much a loss in power but more of a slower delivery higher up the rev range. (and lack of noise)

The car would still squirm around while pushing hard out of slower bends but just seemed a little more refined so the power was still there just being delivered slightly differently. Does that make any sense? Might be one of that "you needed to be there moments".

**glendog74** · 17-08-2010, 07:56 PM

Dan,

The flap has to open at some point - whether 'sport' mode selected or not. Foot to the floor in either mode still means that the flap is open which means equal power output. 'Sport' mode selection merely affects which throttle profile is used and determines at which engine RPM the flap opens. If 'Sport' is on the throttle response is slightly quicker and therefore has a (very small) affect on acceleration response.

I think Shimmy knows the RPM point at which the flap opens in each mode. It was on an old post somewhere on here...

**AlexGTT** · 17-08-2010, 08:05 PM

Had mine off for over 2 years with no probs.

**shimmy** · 17-08-2010, 08:07 PM

NO

If you floor gas pedal in Sport mode it will deliver 0-??bhp MORe at the rev range above the flap opening position (ie when the flap is closed in NON Sport mode). This is a gradual increase.

THis power will only be noticed in the rev range where the sport buttoin has an affect on the flap (something like 3500 and 5200 i think)

BUT if you flap is broken and it does not open at all the difference in bhp will continue up to the top of the rev range and makes a total difference of 30 bhp at the top end

SpineOnABap · 17-08-2010, 08:07 PM

Quote:

Originally Posted by shimmy

when!?!

3 or 4 weeks ago. I was getting fed up with the press attention being one of the UK's longest serving CSL owners

17-08-2010, 07:48 PM	#15
shimmy CSL Register Uber-poster! Join Date: Apr 2008 Location: Uk Posts: 14,646 Casino cash: $43909	__________________ .

17-08-2010, 07:55 PM	#16
rstoughy S6, Sport On, Traction Off Join Date: Jun 2008 Location: Aberdeenshire Posts: 1,947 Casino cash: $25387	Dan, What i noticed last night was not so much a loss in power but more of a slower delivery higher up the rev range. (and lack of noise) The car would still squirm around while pushing hard out of slower bends but just seemed a little more refined so the power was still there just being delivered slightly differently. Does that make any sense? Might be one of that "you needed to be there moments". __________________ Paul. Ooooft!!! 15yrs in the CSL and still loving it "shine on you crazy diamond"

17-08-2010, 07:56 PM	#17
glendog74 CSL Register Uber-poster! Tetris Champion! Join Date: Apr 2008 Location: Cornwall Posts: 8,861 Casino cash: $32299	Dan, The flap has to open at some point - whether 'sport' mode selected or not. Foot to the floor in either mode still means that the flap is open which means equal power output. 'Sport' mode selection merely affects which throttle profile is used and determines at which engine RPM the flap opens. If 'Sport' is on the throttle response is slightly quicker and therefore has a (very small) affect on acceleration response. I think Shimmy knows the RPM point at which the flap opens in each mode. It was on an old post somewhere on here... __________________ Cha'mone Mother F*ker! Last edited by glendog74; 17-08-2010 at 07:59 PM.*

17-08-2010, 08:05 PM	#18
AlexGTT CSL Register Uber-poster! Join Date: Apr 2008 Location: Herefordshire Posts: 4,374 Casino cash: $8572	Had mine off for over 2 years with no probs. __________________ CSL Register Alcoholics Anonymous Group Leader & Businessman of the Year '93! www.earleyengineering.com

17-08-2010, 08:07 PM	#19
shimmy CSL Register Uber-poster! Join Date: Apr 2008 Location: Uk Posts: 14,646 Casino cash: $43909	NO If you floor gas pedal in Sport mode it will deliver 0-??bhp MORe at the rev range above the flap opening position (ie when the flap is closed in NON Sport mode). This is a gradual increase. THis power will only be noticed in the rev range where the sport buttoin has an affect on the flap (something like 3500 and 5200 i think) BUT if you flap is broken and it does not open at all the difference in bhp will continue up to the top of the rev range and makes a total difference of 30 bhp at the top end __________________ .