Hi, I noticed the other day that the throttle position on my SECS display only changes from 9% (off) to 83% (fully on).

Is this normal? It seems a bit strange to me that it doesn't go all the way to 100% when the throttle is fully depressed.

Before anyone suggest it - the mat/carpet are not in the way

TIA

Dibs

 

Not Normal

Mine goes from 0% to 100%

Sorry

Martin

 

Dibs
Has your ECU been changed eg PPP? If so your fitter should have checked and set the ECU to 0% at closed throttle and 100% at WOT Your ECU could be reading the wrong part of the map at a given throttle opening - not good!
My SECS shows 0% and 100% (STi PPP)
JohnD

 

Dibs..

Mine goes from 0% to 90 odd percent (when I start looking at the road)...

AFAIK PSi3 have a disclaimer on the throttle percent readout on their documents particularly for "classic" cars.

Midlife.....

 

Mine also goes to 100%

 

Mine is exactly the same as yours - 9-83%
That's just how it is, i think
MY00 UK Tubro BTW

Richard

 

It is possible (and slightly safer) to check it with the engine off

JohnD - The ECU is a PPP unit, and the car is a MY99. Would you agree that it doesn't look like it was set up properly then?

If the ECU is truly only seeing part (83%) throttle when my foot is on the floor then surely I'm missing out on what's available. If however it's just an error in the display then that's OK. Any ideas how I can check?

Does anyone have a MY99/00 PPP with SECS who can confirm that it can/should go 0-100% please.

Cheers

Dibs

 

If its a simple problem like cable stretch then wedge the throttle down (with engine turned off ). See if the throttle butterfly can open any more by hand.
If so then take up cable slack and recheck the TPS% for WOT.

Nick

 

Just checked mine and it's the same as yours dibs 9% shut through to 82% fully open. Always presumed that the 9% closed figure was the standard throttle opening for idleing.

But only 82% at full throttle seems a bit low.
Could this fig (if reliable) cause the ecu to be reading off the wrong parts of the map during certain load situations if for example the throttle was 100% open but the ecu thought it was only 82% open? or would it just mean you only have 82% of the engines capability available.

Dan.

MY99 Uk Turbo with a BRD Tek3.

 

The throttle is shut at idle, the idle control valve controls idle via the ECU.
It seems quite common on the classic ECU? This may be as it should be, Bob or Branko at BRD would know. From my experience, if these guys mapped your car there should be no problem! When they supplied and mapped a Link ECU on my previous 99my the throttle parameters were the first thing they set.
Not getting the best from the car if only part map is read is not the only possible scenario, incorrect ignition and fuelling could, at a given throttle angle, have undesirable effects. On a previous thread, Mike Wood of Prodrive stated that setting the o% and 100% was part of the PPP set-up and that there was experience of det. occuring on rare examples where this was not done. THE SUBJECT OF THE THREAD IN QUESTION CONCERNED 03 CARS,SO THE ABOVE MAY NOT APPLY. I certainly don't want to put fear into anyones mind but it would be good to have a definitive answer to this??
JohnD

 

The SECS display on GC8 cars can be erroneous, I check every car for correct tps operation so if you have had an upgrade from us then yours will be ok unless ... you do have the mat under the throttle and you would be amazed how many I find like that. Also there is a tolerance on the closed and open voltage the ecu sees and it can have to sort that out just after start up, best to check while driving as opposed to just looking when ign on alone and engine cold.

bob

 

Was just going to mention the carpet! Worth a couple of BHP

MB

 

Has this SECS issue been fixed as one of the software updates, because mine is one of the very first units and has had no software update sine i bought it?

Dan.

 

OK, I'll check it whilst driving next time I go out. How would I go about checking the actual TPS?

My initial concern when I first saw the readout on the SECS was that I would only be using part of the PPP map (i.e. JohnD's comments above) and that this may impact not only performance but "safe" running.

Cheers

Dibs

 

Dibs

Looking at the paperwork that came with my SECS it indicates that the TPS in some cars may only read between 5% and 85%.

This would suggest a SECS error rather than an ECU error as pointed out by Bob Rawle

I would expect that at idle if the SECS were reading 5% TPS then the high revs would be quite noticable..

Midlife.....

 

mine is a scooby monitor which is pretty much the same thing, and my throttle is on minus 2 when the thottle isnt touched

 

I checked the SECS readout whilst driving and it is still the same (9-83%).

So, it looks like it may be a SECS error but I would feel much happier if I could prove it. Any ideas how I check the TPS output to confirm this?

Cheers

Dibs

 

Any ideas....anyone........pleeeeeeease?

Dibs

 

I really don't think it is an issue mate

As I said in a previous post, I have a MY00 with Tek3, and my TPS values read exactly the same as yours - they always have done, even before my remap, when i was running a standard AE802 ecu.

I've checked mine by opening the throttle butterfly, an WOT is 83%

i think you're worried about nothing

Richard