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Author Topic: What diameter exhaust for 1.9 TDI?  (Read 1226 times)

Offline Brian of Nazareth

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What diameter exhaust for 1.9 TDI?
« on: July 13, 2019, 10:29:52 am »
Hi guy's, just a quickie.
I haven't got my car with me to measure, but I wanted to try and get some stainless ordered for the exhaust.
Got a pd90 but I'm going to be fitting a 130 turbo and a set of 150 injectors.
So. What's the standard diameter of the ANU exhaust (if any different from any other 1.9 TDI exhaust) and what diameter ideally SHOULD I have?

It's going to be straight through apart from the cat, if that makes any difference.

Cheers

Offline SirDavidAlhambra

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Re: What diameter exhaust for 1.9 TDI?
« Reply #1 on: July 13, 2019, 12:04:18 pm »
Well sir, I’m not sure but personally I always think of exhausts as being a bit of a waste of money. Why not get a really big one, ideally made of stainless steel so that it lasts. All they do really is pipe the fumes from the front to the back. Important but annoying really. I think a big one would be better than a small one because the air would pump out with less restriction. Just tell the gaffer at the exhaust place to fit a big one and to do it properly. Make sure you check it while it’s still on the ramp in case he bodges it. For instance a common bodge is to give you a stainless exhaust but then weld on a normal steel mounting bracket which rusts.
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all.

Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

Offline Brian of Nazareth

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Re: What diameter exhaust for 1.9 TDI?
« Reply #2 on: July 13, 2019, 01:22:29 pm »
Oh yeah. It's definitely going to be stainless, that's what I meant by "I want to try and get some stainless ordered for the exhaust"
It's no going to a garage, it's being made properly by a welder/fabricator mate of mine.

I was looking for the diameter and also if anyone had any input on whether a larger diameter would benefit at all?

Offline SirDavidAlhambra

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Re: What diameter exhaust for 1.9 TDI?
« Reply #3 on: July 13, 2019, 01:34:50 pm »
Good choice (stainless) and even better if someone you know and trust is doing it. I can’t see a large diameter exhaust doing any harm providing it all fits securely. My motto when it comes to cars is always “bigger is better”!

I am not sure what the standard diameter is but could you for instance look up the part on Euros and get it from the tech specs there? Thank you
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all.

Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

Offline Brian of Nazareth

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Re: What diameter exhaust for 1.9 TDI?
« Reply #4 on: July 14, 2019, 12:15:10 pm »
Well, I though that bigger is better. Get the burnt gasses out quicker............ but it would appear that exhausts are a dark art and all is not as it seems.
Been researching a lot and there are a lot of dependants on which exhaust diameter suits the car best.
I can't go through it all, or even remember a lot of what I've read, but too small causes restriction and back pressure, too big causes not enough back pressure to draw the gasses out quick enough.
That's my grasp of the basics, anyroad

Offline regw

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Re: What diameter exhaust for 1.9 TDI?
« Reply #5 on: July 14, 2019, 06:40:50 pm »
Its a diesel right ?
Deisel fuel is injected not induced, so all that back pressure/valve overlap stuff is mainly irrelevant
as long as you dont have a ridiculously small diameter exhaust pipe.

Offline Brian of Nazareth

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Re: What diameter exhaust for 1.9 TDI?
« Reply #6 on: July 27, 2019, 08:04:49 pm »
Thanks for the info, regw 👍🏻

 

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