Is your F 100% stock - NOTHING changed?  

26 members have voted

  1. 1. Is your F 100% stock - NOTHING changed?

    • Yes - 100% stock. COMPLETELY as it left the factory
      13
    • No - I've modified my F
      13


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3 hours ago, Comedian said:

Need to get 2 RCs to cruise on the motorway together - 80mph is about 2000rpm  so one flap will be closed and one open, and see if MPG is different.

My average hasn't gone down since the mod, if it helps.

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7 hours ago, SMorris said:

My average hasn't gone down since the mod, if it helps

Mine neither; 3200 miles so far at 28.01 mpg.

I also checked the readout vs actual mpg on the last tank. Readout = 30.8, actual = 29.19

 

 

 

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And I'd better check with the forum authority on mods:

Linus; does a golf tee count as a modification? If so, I'll change my vote in the poll

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1 hour ago, MNMJ said:

Mine neither; 3200 miles so far at 28.01 mpg.

I also checked the readout vs actual mpg on the last tank. Readout = 30.8, actual = 29.19

 

 

 

Impressive, I have a mixed commute which gives just shy of 26mpg - which I already thought was pretty good given eco is turned off (don't see the point, nor does it seem to do much). That 26mpg is about 1mpg better than my old ISF, and only about 3mpg worse than an A45 AMG I had.

28+ is remarkable

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28...26...?!

 

I’ve managed 20.3mpg over the last 4,000miles...how are you managing it???

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23 minutes ago, SMorris said:

Impressive, I have a mixed commute which gives just shy of 26mpg - which I already thought was pretty good given eco is turned off (don't see the point, nor does it seem to do much). That 26mpg is about 1mpg better than my old ISF, and only about 3mpg worse than an A45 AMG I had.

28+ is remarkable

full eco does (with flap closed hahah) as I got over 38mpg on a run in eco mode. 

Avg about 21-22 last time I was brave enough to look.

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15 hours ago, Comedian said:

full eco does (with flap closed hahah) as I got over 38mpg on a run in eco mode. 

Avg about 21-22 last time I was brave enough to look.

Yeah, similar.  On a long run can get into mid to high 30's.

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16 hours ago, tomRCFcarbon said:

28...26...?!

 

I’ve managed 20.3mpg over the last 4,000miles...how are you managing it???

Plenty of long motorway runs in the last months, including a schlep over to Spa

In more typical driving, I get 24ish

During a 'day out' in North Wales, 17ish

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On 9/17/2018 at 11:52 AM, NothernDan said:

To weigh in on the "Actuator Mod" debate. Here are my views based on a year of experimentation and observation with various set-ups.

On the ISF the flap opens at about 3600RPM with the hose plugged in which Lexus say is when the car comes 'on-cam' (for want of a better description) and therefore demands more airflow. At this point the volume of air available is more important than the temperature of that air which is why the MAF sensor sits in the intake pipe so the ECU can adjust fuelling to suit both the volume and temperature of the intake air.

All of the aftermarket intakes on the market bar none (RR racing and the factory intake included) will heat sync as none of them are fully sealed. The aftermarket ones all do not make a sufficient seal against the hot air in the engine bay and the factory one opens a flap into the (hot) engine bay which again , will increase intake air temperature (albeit by a small amount at full speed).

That flap on the ISF opens into the engine bay and although there is a duct into the wheel well it is not very free flowing and has no 'push' (RAM) so you are just getting ambient air from the wheel well into the (hot) engine bay which is then sucked into your intake. It's 'hotter than ideal' air.

As previously mentioned I am midway through a project to create a fully sealed intake box for the ISF (no RCF and GSF yet) housing a much larger wet cone filter (larger than any current competitors) leading to 83mm ID intake tubing. It will need an ECU map so the MAF can deal with the airflow and will include instructions to increase flow from the wheel well and insulate current intake routing from the front grille.

My design will increase the availability and flow of the coolest possible air at all times but given it will be fully sealed it may not be the loudest intake out there..... Apologies to all you boy racers.

@Twellsie it would be good to get your views on the above! 😉

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