Valve Replaced

Witchfinder · 23-09-2003, 20:25

I had the N75 valve replaced today. Claybank Skoda did the other valve whilst they were at it, too.

The car is definately smoother. The surge/dropoff around 3000 RPM from the Jabba remap has gone. However, the rawness of the power delivery has also gone.

It still feels faster, although not as fast as it was. I'd be interested to get it back on the rollers and see what the curves look like now!

***DGW*** · 23-09-2003, 20:43

Rob, do you happen to know if the N75 was replaced with the same version?

Witchfinder · 23-09-2003, 23:27

Good question, I never thought to ask! Do Skoda supply different ones?

SkodiRS · 24-09-2003, 00:37

Probably replaced with the standard C version(?). Skoda probably won't have a different one but you can definately get a different veriosn from Audi.

I'm running a J and there is definite increase in response. However this really needs remapping because of the different (N75 valve characteristics.

May change back to standard once I've fitted the Milltek down-pipe and sports cat.

Decision, decisions..............

As a side point......will probably arrange a rolling road session sometime in the new year if there's enough interest.

PaulAlex · 24-09-2003, 07:16

Hi guys,

I know this has been discussed in the past, but is it worth me upgrading my N75 valve before I get Jabba'd next month ? What are the benefits/disadvantages ?

Cheers,

Paul
www.alexrally.com

skodaw · 24-09-2003, 08:04

Paul

As Adrian(SkodiRS) has said -- the different version available from Audi -- does give smoother response -- mainly because it's designed for a higher output than the standard part -- so YES I would change before remap -- better before than after,as it may have a impact on the remap characteristic.

Rob.
You are probably just missing the extra surge the overboost gives -- I suspect the power will be fine,poss down slightly -- but more than likely just the drop in overboost being felt !!

PaulAlex · 24-09-2003, 09:12

All,

To keep you up-to-date, Jabbasport have just emailed me to say that I should stay with the standard valve.

Roll on October 3rd

www.alexrally.com

Witchfinder · 24-09-2003, 09:21

Quote:

Originally posted by skodaw in this post
You are probably just missing the extra surge the overboost gives -- I suspect the power will be fine,poss down slightly -- but more than likely just the drop in overboost being felt !!

That's what I suspected. For anyone with the 3000 rpm "spike" who is also considering a valve change or getting the spike mapped out, think carefully about it. Do you prefer smoothness, or can you live with the spike for a little more kick?

I'm not cerain I'm glad I changed the valve. The overboost was mental and I was really enjoying it. The car feels pretty sluggish now in comparison (even though I know it isn't really). However, the smoothness is preferable for when I'm carrying passengers.

SkodiRS · 24-09-2003, 09:35

Rob,

I would give Mike a bell as I think you would need to have the original map remapped to take into consideration the new one's characteristics.

Cheers.
Adrian.

Witchfinder · 24-09-2003, 10:47

When I spoke to Mike last week, he seemed to think I wouldn't need any alterations doing after the valve was replaced.

SkodiRS · 24-09-2003, 10:56

Hmmm.....this is kind of at odds with what Elton told me.....however I suppose this could be if you're changing to a different type of valve.

That said I suppose although a remap is done to a certain N75 valve may be the map takes into consideration a certain amount of tolerance on the device.

I'm a little bit confused now.........who put me on this slippery slope anyway.

***DGW*** · 24-09-2003, 11:50

Adrian, I think the remap is only affected if a different version N75 is fitted. That said, if the remap was carried out on a car with dodgy valves, I guess the remap won't give the best results. But isn't the starting point a 'canned' remap (ie based on a number of similar cars) which Mike optimises for your car and preferences? I don't know how many 'canned' versions he has, but I did ask for the standard map as a starting point.

SkodiRS · 24-09-2003, 12:09

Denis,

I was thinking the same thing as per the flaky N75 valve.

I'm pretty sure Mike has a baseline map he first loads and then as you say optimises per individual.

Not sure how he got to the baseline but may be as you suggest, it's an "average" over a number of cars.

Mike is pretty conservative on his maps and he won't give you anything other than his standard remap unless you can specifically say what you want i.e what sort of revs you want certain characteristics to happen etc.

***ncarring*** · 24-09-2003, 12:26

I think he has one baseline map per engine type. The thing he really wanted to know before doing mine was what engine code it was, then he used his standard AGU map to start from. He did say it ended up quite different from the starting point though - think that was for a Golf.

Dutch4x4 · 24-09-2003, 13:27

Quote:

Originally posted by Witchfinder in this post
I had the N75 valve replaced today. Claybank Skoda did the other valve whilst they were at it, too.

The car is definately smoother. The surge/dropoff around 3000 RPM from the Jabba remap has gone. However, the rawness of the power delivery has also gone.

It still feels faster, although not as fast as it was. I'd be interested to get it back on the rollers and see what the curves look like now!

Very peculiar, Rob. Did you replace it because the old one was broken?

I don't see how your car's characteristics can change so dramatically by replacing one N75C with another. They can, however, by replacing it with another type such as Adrian's. So Denis' question is very valid: did you by chance get another type?

(Now where's that other N75 thread?)

Witchfinder · 24-09-2003, 17:01

Quote:

Originally posted by Dutch4x4 in this post
Very peculiar, Rob. Did you replace it because the old one was broken?

I replaced it because Mike at Jabba said it was sticking. He seemed to think a new valve would sort the problem out. Certainly the overboost characteristics and spike at 3000 rpm seemed to confirm that point, but now the car just doesn't feel as powerful.

I will be calling them again just to confirm one way or another - it's a full day out if I want to go back, and I don't want to make the trip unless it is definately wrong.

Dutch4x4 · 24-09-2003, 17:50

Ah, a sticking valve would explain the overboost alright!

(How to get a sports N75? Get it to stick!

)

Mind you, in the long term it's better this way, believe me. You wouldn't want to overload the turbo with continuing overboost...

Witchfinder · 29-09-2003, 13:05

Another call to Jabba has confirmed that they think adjusting the map will be unnecessary. To be honest, I'm not certain I agree. Pre valve replacement, it felt awesome (despite the power spike at 3000 rpm). Now it feels sluggish - almost like the original map.

The grin has gone...

***DGW*** · 29-09-2003, 14:32

Rob, sounds like you need to get your car checked on a RR to see whether the power really has gone, and for peace of mind.

SkodiRS · 29-09-2003, 14:57

Rob,

get back on the phone and tell Mike that you're not happy with the performance now that you've had the N75 changed.

Jabba are good peeps so should be able to sort you.

23-09-2003, 20:25	#1
Witchfinder Briskodian Join Date: Oct 2002 Location: Wheelspinning 'round the wet roads of Manchester Posts: 1,284 Thanks: 0 Thanked 0 Times in 0 Posts	Valve Replaced I had the N75 valve replaced today. Claybank Skoda did the other valve whilst they were at it, too. The car is definately smoother. The surge/dropoff around 3000 RPM from the Jabba remap has gone. However, the rawness of the power delivery has also gone. It still feels faster, although not as fast as it was. I'd be interested to get it back on the rollers and see what the curves look like now! __________________ Rob Illing Play Interstellar War: "Fleet Battles" and "Conquest" for free! The ST220 has landed! Die Micra, Die!

23-09-2003, 20:43	#2
*DGW* BRISKODA Staff Join Date: Oct 2002 Location: Cambridgeshire Posts: 17,042 Thanks: 46 Thanked 154 Times in 115 Posts	Rob, do you happen to know if the N75 was replaced with the same version? __________________ Denis 2002 Octavia 1.8T 4X4 turbo Estate - rebreathed on by Jabba ... 31.93mpg 2007 Fabia vRS - CC, ESP, Jabba rear ARB, and full leather trim by Seat Surgeons ...48.01 mpg...

23-09-2003, 23:27	#3
Witchfinder Briskodian Join Date: Oct 2002 Location: Wheelspinning 'round the wet roads of Manchester Posts: 1,284 Thanks: 0 Thanked 0 Times in 0 Posts	Good question, I never thought to ask! Do Skoda supply different ones? __________________ Rob Illing Play Interstellar War: "Fleet Battles" and "Conquest" for free! The ST220 has landed! Die Micra, Die!

24-09-2003, 00:37	#4
SkodiRS BRISKODA Staff Join Date: Oct 2002 Location: darkest Hampshire Posts: 8,650 Thanks: 0 Thanked 17 Times in 13 Posts	Probably replaced with the standard C version(?). Skoda probably won't have a different one but you can definately get a different veriosn from Audi. I'm running a J and there is definite increase in response. However this really needs remapping because of the different (N75 valve characteristics. May change back to standard once I've fitted the Milltek down-pipe and sports cat. Decision, decisions.............. As a side point......will probably arrange a rolling road session sometime in the new year if there's enough interest. __________________ Adrian.

24-09-2003, 07:16	#5
PaulAlex Briskodian Join Date: Aug 2003 Location: Hertfordshire Posts: 46 Thanks: 0 Thanked 0 Times in 0 Posts	Hi guys, I know this has been discussed in the past, but is it worth me upgrading my N75 valve before I get Jabba'd next month ? What are the benefits/disadvantages ? Cheers, Paul www.alexrally.com __________________ http://www.alexrally.com 53-plate Black Magic vRS, Jabba power, Bailey dump valve, 18" rims.

24-09-2003, 08:04	#6
skodaw Briskodian Join Date: Jun 2003 Location: This area is under construction - please call back later :) Posts: 3,186 Thanks: 2 Thanked 9 Times in 5 Posts	Paul As Adrian(SkodiRS) has said -- the different version available from Audi -- does give smoother response -- mainly because it's designed for a higher output than the standard part -- so YES I would change before remap -- better before than after,as it may have a impact on the remap characteristic. Rob. You are probably just missing the extra surge the overboost gives -- I suspect the power will be fine,poss down slightly -- but more than likely just the drop in overboost being felt !! __________________ Dave '05 Silver Fabia vRS

24-09-2003, 09:12	#7
PaulAlex Briskodian Join Date: Aug 2003 Location: Hertfordshire Posts: 46 Thanks: 0 Thanked 0 Times in 0 Posts	All, To keep you up-to-date, Jabbasport have just emailed me to say that I should stay with the standard valve. Roll on October 3rd www.alexrally.com __________________ http://www.alexrally.com 53-plate Black Magic vRS, Jabba power, Bailey dump valve, 18" rims.

24-09-2003, 09:35	#9
SkodiRS BRISKODA Staff Join Date: Oct 2002 Location: darkest Hampshire Posts: 8,650 Thanks: 0 Thanked 17 Times in 13 Posts	Rob, I would give Mike a bell as I think you would need to have the original map remapped to take into consideration the new one's characteristics. Cheers. Adrian. __________________ Adrian.

24-09-2003, 10:47	#10
Witchfinder Briskodian Join Date: Oct 2002 Location: Wheelspinning 'round the wet roads of Manchester Posts: 1,284 Thanks: 0 Thanked 0 Times in 0 Posts	When I spoke to Mike last week, he seemed to think I wouldn't need any alterations doing after the valve was replaced. __________________ Rob Illing Play Interstellar War: "Fleet Battles" and "Conquest" for free! The ST220 has landed! Die Micra, Die!

24-09-2003, 10:56	#11
SkodiRS BRISKODA Staff Join Date: Oct 2002 Location: darkest Hampshire Posts: 8,650 Thanks: 0 Thanked 17 Times in 13 Posts	Hmmm.....this is kind of at odds with what Elton told me.....however I suppose this could be if you're changing to a different type of valve. That said I suppose although a remap is done to a certain N75 valve may be the map takes into consideration a certain amount of tolerance on the device. I'm a little bit confused now.........who put me on this slippery slope anyway. __________________ Adrian.

24-09-2003, 11:50	#12
*DGW* BRISKODA Staff Join Date: Oct 2002 Location: Cambridgeshire Posts: 17,042 Thanks: 46 Thanked 154 Times in 115 Posts	Adrian, I think the remap is only affected if a different version N75 is fitted. That said, if the remap was carried out on a car with dodgy valves, I guess the remap won't give the best results. But isn't the starting point a 'canned' remap (ie based on a number of similar cars) which Mike optimises for your car and preferences? I don't know how many 'canned' versions he has, but I did ask for the standard map as a starting point. __________________ Denis 2002 Octavia 1.8T 4X4 turbo Estate - rebreathed on by Jabba ... 31.93mpg 2007 Fabia vRS - CC, ESP, Jabba rear ARB, and full leather trim by Seat Surgeons ...48.01 mpg...

24-09-2003, 12:09	#13
SkodiRS BRISKODA Staff Join Date: Oct 2002 Location: darkest Hampshire Posts: 8,650 Thanks: 0 Thanked 17 Times in 13 Posts	Denis, I was thinking the same thing as per the flaky N75 valve. I'm pretty sure Mike has a baseline map he first loads and then as you say optimises per individual. Not sure how he got to the baseline but may be as you suggest, it's an "average" over a number of cars. Mike is pretty conservative on his maps and he won't give you anything other than his standard remap unless you can specifically say what you want i.e what sort of revs you want certain characteristics to happen etc. __________________ Adrian.

24-09-2003, 12:26	#14
*ncarring* Don't talk, drive! Join Date: Feb 2003 Location: The B roads of Britain Posts: 12,867 Thanks: 15 Thanked 86 Times in 74 Posts	I think he has one baseline map per engine type. The thing he really wanted to know before doing mine was what engine code it was, then he used his standard AGU map to start from. He did say it ended up quite different from the starting point though - think that was for a Golf. __________________ Nick

24-09-2003, 17:50	#17
Dutch4x4 Briskodian Join Date: Feb 2003 Location: kicking up feet in the Formula Stealth paddock Posts: 3,153 Thanks: 0 Thanked 0 Times in 0 Posts	Ah, a sticking valve would explain the overboost alright! (How to get a sports N75? Get it to stick! ) Mind you, in the long term it's better this way, believe me. You wouldn't want to overload the turbo with continuing overboost... __________________ Mrs D's Briskoda: Octavia 4x4 turbo (2003), Oettinger 210, Koni Sport, MAD Sportive, Dotz Le Mans 17", Bridgestone Potenza S-03, sports interior. And a Fiesta ST (2006) for myself...

29-09-2003, 13:05	#18
Witchfinder Briskodian Join Date: Oct 2002 Location: Wheelspinning 'round the wet roads of Manchester Posts: 1,284 Thanks: 0 Thanked 0 Times in 0 Posts	Another call to Jabba has confirmed that they think adjusting the map will be unnecessary. To be honest, I'm not certain I agree. Pre valve replacement, it felt awesome (despite the power spike at 3000 rpm). Now it feels sluggish - almost like the original map. The grin has gone... __________________ Rob Illing Play Interstellar War: "Fleet Battles" and "Conquest" for free! The ST220 has landed! Die Micra, Die!

29-09-2003, 14:32	#19
*DGW* BRISKODA Staff Join Date: Oct 2002 Location: Cambridgeshire Posts: 17,042 Thanks: 46 Thanked 154 Times in 115 Posts	Rob, sounds like you need to get your car checked on a RR to see whether the power really has gone, and for peace of mind. __________________ Denis 2002 Octavia 1.8T 4X4 turbo Estate - rebreathed on by Jabba ... 31.93mpg 2007 Fabia vRS - CC, ESP, Jabba rear ARB, and full leather trim by Seat Surgeons ...48.01 mpg...

29-09-2003, 14:57	#20
SkodiRS BRISKODA Staff Join Date: Oct 2002 Location: darkest Hampshire Posts: 8,650 Thanks: 0 Thanked 17 Times in 13 Posts	Rob, get back on the phone and tell Mike that you're not happy with the performance now that you've had the N75 changed. Jabba are good peeps so should be able to sort you. __________________ Adrian.

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