Must Do Better

**delcac** · 15-08-2003, 20:12

Ever get the feeling you just aren't doing enough to make you 1.8T go faster.

**delcac** · 15-08-2003, 20:17

How about 600bhp at the wheels.

Dutch4x4 · 15-08-2003, 20:26

So how do you scoop that in?

**delcac** · 15-08-2003, 20:29

That's the same engine in the top pic.

Dutch4x4 · 15-08-2003, 20:43

So that's how they do it.

Quinten · 15-08-2003, 20:47

What's that VW badge doing on front of your car Des?

FabiaTDi · 15-08-2003, 20:55

600bhp at the wheels?

Is the car in question a front wheel drive? If it is, driving it must be "interesting"

Jimmy · 15-08-2003, 20:57

That turbo's the size of a dustbin lid.. Massive

**delcac** · 15-08-2003, 22:14

How about this one, now that's what I call a tight fit.

***ncarring*** · 15-08-2003, 22:54

And how long does one of these engines last, approximately?

**delcac** · 16-08-2003, 08:45

Next you'll be asking if the warranty has been voided by all these mods.

Oh and it's probably shot the mpg as well.

Des

***ncarring*** · 16-08-2003, 11:12

Des - no it was kind of a serious question ... Is this the kind of engine that needs a rebuild every couple of thousand miles - it looks like it....

Are you planning one like this for your Octy? Can't imagine the shell would take 600bhp without bits falling off - would need lots of strengthening.

You post all these pics, but nothing to tell us what they are, or what your plans are. You mustn't be surprised when we ask questions

redbaron · 16-08-2003, 13:04

Des

is that AET's GT30 and tubular manifold w extneral wastegate?

or someother monster?

***ncarring*** · 16-08-2003, 13:20

Need someone to explain what/where a wastegate is now, please.

Footnote: Yes I know I look dumb asking all these questions but at least I act as a whipping boy for all the others who'd like explanations as well :p

Quinten · 16-08-2003, 15:06

**delcac** · 16-08-2003, 17:12

Quote:

Originally posted by ffelan in this post
Des

is that AET's GT30 and tubular manifold w extneral wastegate?

or someother monster?

Nick,
I suppose it would depend on what you used the car for and how hard you pushed it, wouldn't have thought it had the longevity of an OE engine.

Paul,
It's made by Trial don't know what the part number is.

Des

KLB · 16-08-2003, 21:34

Quote:

Originally posted by ncarring in this post
Need someone to explain what/where a wastegate is now, please.

Footnote: Yes I know I look dumb asking all these questions but at least I act as a whipping boy for all the others who'd like explanations as well :p

It isn't a dumb question!

The wastegate controls how much exhaust gas flows through the turbine part of the turbocharger (and hence how much boost is generated).

If the wastegate is closed, all the exhaust gas goes through the turbocharger, making it generate lots of boost pressure.

On VW 1.8T engines, though, the boost pressure is selected by the ECU. To do this, it controls the wastegate, which allows variable amounts of exhaust gases to rnter (or bypass) the turbo.

***ncarring*** · 16-08-2003, 23:14

Hmmm - during my remap, Mike showed me a valve which he explained controlled the boost pressure by means of an open/shut ratio controlled by the ECU. However, this valve was in line with rubber hoses, which I find hard to believe contained hot exhaust gases. I therefore believe this valve was on the cold air side of the turbo, and was not the wastegate. Am I wrong?

PS I read up on wastegates and your explanation agrees with what I read - the wastegate is a bypass valve on the hot gas side of the turbo, i.e. it allows hot exhaust gas to bypass the inlet stage of the turbine.

Eric_R · 18-08-2003, 10:44

No, thats correct. The wastegate is operated by boostpreassure and that valve controls
how much boost the wastegate sees. Called N75 valve and is available in a few versions
that can be used to change the amount of surging or boost peak the car has.

***ncarring*** · 18-08-2003, 10:47

Thanks Eric - sorry for doubting you, Mike

redbaron · 18-08-2003, 11:16

you can adjust the n75 ther eis a little screw on it... not sure which way to turn though or the actuall effect? if someone knows i will try it?

***ncarring*** · 18-08-2003, 11:34

Since that seems to be the main component of the remap I'm loath to mess with it. I don't want to make any gross changes to the boost pressure etc. after Mike spent so long getting it right

KLB · 18-08-2003, 11:41

Quote:

Originally posted by ffelan in this post
you can adjust the n75 ther eis a little screw on it... not sure which way to turn though or the actuall effect? if someone knows i will try it?

It's probably not a good idea to screw around with the screw - all it does is get the ECU upset. See here

redbaron · 18-08-2003, 11:50

so if i have surging already turing the valve down may help then? (assuming that as per the link turing it up causes surging?

***ncarring*** · 18-08-2003, 11:54

Was the surging caused by your remap, Paul? If so IMHO you would be better getting the map tweaked for the particular throttle angle/RPM where the surging occurs. If you alter the N75 valve you are changing its effect over the whole spectrum of throttle angles/RPM, and may have negative effects on other parts of the map.

15-08-2003, 20:12	#1
delcac Still a **** Join Date: Nov 2002 Location: Chatham, Kent Posts: 7,396 Members Car: A red one Images: 3 Thanks: 17 Thanked 70 Times in 55 Posts	Must Do Better Ever get the feeling you just aren't doing enough to make you 1.8T go faster. __________________ The Red Devil

15-08-2003, 20:17	#2
delcac Still a **** Join Date: Nov 2002 Location: Chatham, Kent Posts: 7,396 Members Car: A red one Images: 3 Thanks: 17 Thanked 70 Times in 55 Posts	How about 600bhp at the wheels. __________________ The Red Devil

15-08-2003, 20:26	#3
Dutch4x4 Briskodian Join Date: Feb 2003 Location: kicking up feet in the Formula Stealth paddock Posts: 3,153 Members Car: 1.8T Elegance Hatchback 4x4 Thanks: 0 Thanked 0 Times in 0 Posts	So how do you scoop that in? __________________ 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...

15-08-2003, 20:29	#4
delcac Still a **** Join Date: Nov 2002 Location: Chatham, Kent Posts: 7,396 Members Car: A red one Images: 3 Thanks: 17 Thanked 70 Times in 55 Posts	That's the same engine in the top pic. __________________ The Red Devil

15-08-2003, 20:43	#5
Dutch4x4 Briskodian Join Date: Feb 2003 Location: kicking up feet in the Formula Stealth paddock Posts: 3,153 Members Car: 1.8T Elegance Hatchback 4x4 Thanks: 0 Thanked 0 Times in 0 Posts	So that's how they do it. __________________ 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...

15-08-2003, 20:47	#6
Quinten Crossdresser Join Date: Apr 2003 Location: fast lane Posts: 10,000 Members Car: Citroen C-Crosser 2.2HDI Thanks: 25 Thanked 40 Times in 37 Posts	What's that VW badge doing on front of your car Des? __________________ Awooga!!!

15-08-2003, 20:55	#7
FabiaTDi VT5 Join Date: Dec 2002 Location: Warwickshire Posts: 2,001 Members Car: Fabia vRS Thanks: 0 Thanked 0 Times in 0 Posts	600bhp at the wheels? Is the car in question a front wheel drive? If it is, driving it must be "interesting" __________________ Was: 2003 Allard Tuned Fabia vRS VT5 Turbo Conversion Now: 2008 Audi A3 Sportback TDI

15-08-2003, 20:57	#8
Jimmy Briskodian Join Date: May 2003 Location: North East Posts: 2,446 Members Car: Octavia ahem Hearse Thanks: 0 Thanked 0 Times in 0 Posts	That turbo's the size of a dustbin lid.. Massive

15-08-2003, 22:14	#9
delcac Still a **** Join Date: Nov 2002 Location: Chatham, Kent Posts: 7,396 Members Car: A red one Images: 3 Thanks: 17 Thanked 70 Times in 55 Posts	How about this one, now that's what I call a tight fit. __________________ The Red Devil Last edited by delcac; 15-08-2003 at 22:16.

15-08-2003, 22:54	#10
*ncarring* Don't talk, drive! Join Date: Feb 2003 Location: The B roads of Britain Posts: 12,965 Members Car: 1983 Porsche 928S / 1972 MGB GT Thanks: 17 Thanked 96 Times in 79 Posts	And how long does one of these engines last, approximately? __________________ Nick North Wiltshire RoADAR

16-08-2003, 08:45	#11
delcac Still a **** Join Date: Nov 2002 Location: Chatham, Kent Posts: 7,396 Members Car: A red one Images: 3 Thanks: 17 Thanked 70 Times in 55 Posts	Next you'll be asking if the warranty has been voided by all these mods. Oh and it's probably shot the mpg as well. Des __________________ The Red Devil

16-08-2003, 11:12	#12
*ncarring* Don't talk, drive! Join Date: Feb 2003 Location: The B roads of Britain Posts: 12,965 Members Car: 1983 Porsche 928S / 1972 MGB GT Thanks: 17 Thanked 96 Times in 79 Posts	Des - no it was kind of a serious question ... Is this the kind of engine that needs a rebuild every couple of thousand miles - it looks like it.... Are you planning one like this for your Octy? Can't imagine the shell would take 600bhp without bits falling off - would need lots of strengthening. You post all these pics, but nothing to tell us what they are, or what your plans are. You mustn't be surprised when we ask questions __________________ Nick North Wiltshire RoADAR

16-08-2003, 13:04	#13
redbaron Briskodian Join Date: Jun 2003 Posts: 9,568 Members Car: Thanks: 15 Thanked 70 Times in 61 Posts	Des is that AET's GT30 and tubular manifold w extneral wastegate? or someother monster? __________________ ________________________________________ Some times I just feel like smiling.

16-08-2003, 13:20	#14
*ncarring* Don't talk, drive! Join Date: Feb 2003 Location: The B roads of Britain Posts: 12,965 Members Car: 1983 Porsche 928S / 1972 MGB GT Thanks: 17 Thanked 96 Times in 79 Posts	Need someone to explain what/where a wastegate is now, please. Footnote: Yes I know I look dumb asking all these questions but at least I act as a whipping boy for all the others who'd like explanations as well :p __________________ Nick North Wiltshire RoADAR

16-08-2003, 15:06	#15
Quinten Crossdresser Join Date: Apr 2003 Location: fast lane Posts: 10,000 Members Car: Citroen C-Crosser 2.2HDI Thanks: 25 Thanked 40 Times in 37 Posts	<image of a line of newbies taking one step back leaving just Nick to deal with it> __________________ Awooga!!!

16-08-2003, 23:14	#18
*ncarring* Don't talk, drive! Join Date: Feb 2003 Location: The B roads of Britain Posts: 12,965 Members Car: 1983 Porsche 928S / 1972 MGB GT Thanks: 17 Thanked 96 Times in 79 Posts	Hmmm - during my remap, Mike showed me a valve which he explained controlled the boost pressure by means of an open/shut ratio controlled by the ECU. However, this valve was in line with rubber hoses, which I find hard to believe contained hot exhaust gases. I therefore believe this valve was on the cold air side of the turbo, and was not the wastegate. Am I wrong? PS I read up on wastegates and your explanation agrees with what I read - the wastegate is a bypass valve on the hot gas side of the turbo, i.e. it allows hot exhaust gas to bypass the inlet stage of the turbine. __________________ Nick North Wiltshire RoADAR

18-08-2003, 10:44	#19
Eric_R Briskodian Join Date: Nov 2002 Location: Stockholm Posts: 41 Members Car: Thanks: 0 Thanked 0 Times in 0 Posts	No, thats correct. The wastegate is operated by boostpreassure and that valve controls how much boost the wastegate sees. Called N75 valve and is available in a few versions that can be used to change the amount of surging or boost peak the car has.

18-08-2003, 10:47	#20
*ncarring* Don't talk, drive! Join Date: Feb 2003 Location: The B roads of Britain Posts: 12,965 Members Car: 1983 Porsche 928S / 1972 MGB GT Thanks: 17 Thanked 96 Times in 79 Posts	Thanks Eric - sorry for doubting you, Mike __________________ Nick North Wiltshire RoADAR

18-08-2003, 11:16	#21
redbaron Briskodian Join Date: Jun 2003 Posts: 9,568 Members Car: Thanks: 15 Thanked 70 Times in 61 Posts	you can adjust the n75 ther eis a little screw on it... not sure which way to turn though or the actuall effect? if someone knows i will try it? __________________ ________________________________________ Some times I just feel like smiling.

18-08-2003, 11:34	#22
*ncarring* Don't talk, drive! Join Date: Feb 2003 Location: The B roads of Britain Posts: 12,965 Members Car: 1983 Porsche 928S / 1972 MGB GT Thanks: 17 Thanked 96 Times in 79 Posts	Since that seems to be the main component of the remap I'm loath to mess with it. I don't want to make any gross changes to the boost pressure etc. after Mike spent so long getting it right __________________ Nick North Wiltshire RoADAR

18-08-2003, 11:50	#24
redbaron Briskodian Join Date: Jun 2003 Posts: 9,568 Members Car: Thanks: 15 Thanked 70 Times in 61 Posts	so if i have surging already turing the valve down may help then? (assuming that as per the link turing it up causes surging? __________________ ________________________________________ Some times I just feel like smiling.

18-08-2003, 11:54	#25
*ncarring* Don't talk, drive! Join Date: Feb 2003 Location: The B roads of Britain Posts: 12,965 Members Car: 1983 Porsche 928S / 1972 MGB GT Thanks: 17 Thanked 96 Times in 79 Posts	Was the surging caused by your remap, Paul? If so IMHO you would be better getting the map tweaked for the particular throttle angle/RPM where the surging occurs. If you alter the N75 valve you are changing its effect over the whole spectrum of throttle angles/RPM, and may have negative effects on other parts of the map. __________________ Nick North Wiltshire RoADAR

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