View Full Version : LEON 180hp losing power.. HELP!
:confused:
Anyone out there who can help me out with my delicate problem.
I.e.
The car is chipped up to approx. 218hp, has the original airfilter on, although I have put in a Forge dump.
The problem is that i lose power when stamping the pedal to the bottom (to accelerate quickest possible ;) ). I lose it between approx 3200 up to 4800 rpm. Actually, the power comes and goes. I can se on the turbopressure instrument (I don't know the english word for it, sorry) that the presseure goes up and down between 0.5 and 1.1 bar.
Before 3200rpm and after 4800rpm, the car works super! But you can imagine how many green-light races I lose having this problem.
The company that put in the chip have had the car for two days testing new software, updating the software etc. but they can't find any wrong codes in the system.
What to do?
Could it be the MAF? If yes; how hard is it to change it by oneself? Does the car need to be "reprogrammed" or is it just to replace the MAF and start the engine and test it? Can I use a MAF from say a VW 1.8T 150hp or a AUDI 1.8TS 180hp ? Or must it be a SEAT LEON 180hp?
Many thanks in advance!
/Paco
It should be the N75 valve. Some posts regarding to this problem on vwvortex, they say you have to replace "?????" F part number n75 valve to the same "?????" C one to fix this problem.
Thanks for the reply, but what is the "vwvortex"???
/D
Ahhh! www.vwvortex.com
I presume.!
Thanks! I'll have a search there!
/D
What you are experiencing is called surging, you can do a search on it here or on vwvortex, F revision of N75 wont help you though, mine is surging with that one at the moment, and as you say below 3k and above 4.5k it is gone!, looks like we both have the same problem!,
I am running an upsolute chip at the moment, apparently valois at upsolute knows about the problem and has new software to fix it but i havent had a chance to contact him yet
So if I understand your answer correct.... There isn't much to do except wait for my dealer to reprogram the software??
Have you tried to adjust the N75??
/Paco
Some help from home....
This is what you are looking for:
http://forums.vwvortex.com/zerothread?id=262994
No, it is not the fault of the chip, but the N75 valve (probably cant cope with the higher boost). There are aftermarket tuning N75 valves available which even may give some extra BHP, may worth a try.
Mosser;
the F valve won't stop surging, that's why you have to replace it to an older C one.
mpkayeuk
04-07-2002, 10:18
It is not unusual to have to change the stock Boost Control Solenoid (N75) when chipping a vehicle. Sometimes the stock valve just can't respond quickly enough making it difficult to control boost levels tightly.
I had to change the boost control solenoid on my Scooby when I got the Link ECU fitted. Without this boost control is a hit and miss affair. Perhaps the stock valve on the VAG engine just isn't up to the job and a new one is required when running higher boost.
I have no experience with this engine in particular but it's an idea. You can bet your arse that those 470BHP race engines used in the Australian race series don't use the stock N75 ;)
So now that i have one of the 'naff' F version N75 valves and am getting surging, does anyone know of a supplier in the UK of the ECS N75 valve?, i would prefer to try this that source a C version N75
And i'm not going to fiddle with N75 ever again!!
Just for your info:
I read the thread "Surging Poll - what is your N75 screw position",
and tested it....
Well, at first i turned the screw counterclockwise to "11-o'clock", and the car responded better, but there were still som surging (especially on the 3rd and 4th gear).
So i turned it clockwise to 2 o'clock..-> massive surging (from 2nd gear and up).
Turned it to 3 o'clock..-> better but still surging (especially on 3rd and 4th gear)
Turned it finally to 4 o'clock..-> practically no surging at all.
So i left it like this, and will test the Leon a bit harder tomorrow.
I'll get back with the info about that!
What's your opinion about this? Will it stay non-surging? Does the ECU need re-programming?
Any hints, tips, opinions is gratefully accepted!
Thanks!
/Paco:D
Hmmmm....
I have now tested the lion a bit harder and i noticed that the turbopressure only comes up to ~0.6bar, but before the adjustment of the screw the pressure was up at ~1.1 - 1.2bar.
Why? Anyone?
/Paco:confused:
HEY!!!!
I am experiencing the same problem on my 20VT beezer!!!!
I took the car to chipping but it cannot go higher than 0.7bar of boost. The chip asks for 1.2bar in spike and 1.0 sustained thru the rev range, but car cannot go higher than 0.7 bar.
Maybe i should fiddle with my N75, too?????
If your only getting 0.6 bar pressure it sounds like you did what i did and naffed you N75!, only fix if tweaking doesnt help (and in the 3 N75's i have broke due to tweaking them, none have responded to the adjuster any more after that) then your only fix now is to get a new N75, the problem you have is that if you go to your Seat dealer to get one, you will more than likely get an F version which is likely to give surging if your chipped,
This is why i am trying to find an ECS N75 (racing?) valve and it sounds like you need one too !!, if and when you do get one, dont touch the adjuster!
Tried to adjust my N75 on my beezer, but no difference, car is almost same in every position. It was however very hard to adjust, sometimes it felt like it would stuck or something.
What do you think, is my N75 naffed too? You know, my car can't go higher that 0.68-0.7 bar in boost and ECU requests a lot higher!
I got the C version fitted by the way, already called SEAT and they said it's ~100 EUR (~70 GBP) but gotta order as they dont have it in stock.
Should I order a new one, too???
pstables
05-07-2002, 11:57
Some more info on the N75...
http://s2central.net/ds_N75.html
Paul
I too have this problem and RSD have been kindly looking into it as it occured when the car was chipped. We have checked the N75 setting, Dump-Valve, all air-seals on induction side, MAF sensor. They are now talking to Oettinger in Germany to try and find a solution!
Will let you know!
R>
Has anyone in the UK got a broken N75 that i can have to take apart and see exactly how they work and why they fail?
I'm happy to pay postage costs and will post pictures of its internals and details of how it works for all to see,
Hopefully we can all learn something from me doing this and see why they are so fragile
Well, now I have really been kickin' some **** with the Lion. :devil:
As I didn't like that I only had some 50% of the pressure that the chip asks for made me continue to adjust the N75 screw. And now it's turned to about 10 o'clock, and there is minimal surging but the pressure is up to some ~1.1 - 1.2bar.
So I believe that what I am adjusting is how tight the spring should be inside the valve (i.e. how much boosted or unboosted air will go to the wastegate)
Or can anyone give me another possibility what the screw adjusts? :confused:
/Paco