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26-03-18, 12:15 PM | #1 | |
Grown up member
Join Date: Nov 2017
Location: Belgium
Posts: 44
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Engine performance 1Z audi 80 cabriolet
Hi,
This winter I bought an 1Z audi 80 Cabriolet 90pk (1.9 tdi). I gave the engine a good service this winter: - new oil and filter - new air filter - new belts (timing, waterpump belt, alternator belt) - new radiator - new waterpump - new intercooler - new coolant sensors - new thermostat - fresh coolant ... The car has 185000 miles on the clock. There is no excessive smoke from exhaust, there are now weird noises from engine... car start's on first turn of key and idles very smooth... So now I tested it's performance (for what it's worth ) and came to bit of a surprise... Normally car should reach 60miles/hour at about 14 seconds. It took my car 21 seconds What could be reason of this loss of performance? It could be turbo, but shouldn't there be a lot of smoke from the exhaust? EGR valve? Injectors? ... Any toughts are welcome before I start breaking down the engine... How can I check different componants for malfunction? thanks for all the help... Last edited by fritzvis; 26-03-18 at 12:21 PM. |
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26-03-18, 04:56 PM | #2 |
Senior Member
Classic Audi Club Member
Join Date: Dec 2007
Location: yorkshire
Posts: 1,525
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fuel pump timing checked?
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26-03-18, 05:19 PM | #3 |
4 ring whore!
Classic Audi Club Member
Join Date: Mar 2011
Location: Scottish Borders.
Posts: 7,520
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Inlet manifold can get restrictive due to build up of crap?
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26-03-18, 05:24 PM | #4 |
Grown up member
Join Date: Nov 2017
Location: Belgium
Posts: 44
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26-03-18, 05:39 PM | #5 |
Grown up member
Join Date: Feb 2018
Posts: 44
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Do a pressure test on the turbo output under boost with an accurate gauge.
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26-03-18, 05:39 PM | #6 | |
4 ring whore!
Classic Audi Club Member
Join Date: Mar 2011
Location: Scottish Borders.
Posts: 7,520
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Quote:
I need to give mine some love and this is one of the jobs to do! |
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26-03-18, 05:43 PM | #7 |
4 ring whore!
Join Date: Jun 2008
Location: Rucava, Latvija
Posts: 3,816
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How about chance that gasket between steering wheel and drivers seat is suboptimal for the car in question? I, for example, am quite sure I won't get out 8 seconds out of my golf, despite it should be capable of that - simply because I'm not drag racer and I don't know what is the optimal acceleration profile for it.
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26-03-18, 05:46 PM | #8 | |
Grown up member
Join Date: Nov 2017
Location: Belgium
Posts: 44
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Quote:
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26-03-18, 08:31 PM | #9 |
4 ring whore!
Join Date: Jun 2008
Location: Rucava, Latvija
Posts: 3,816
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7 second difference here is just 50% increase in time; something like if I would clock my golf at 12 seconds instead of 8.
I've seen videos of how diesel fans accelerate in their cars in drag race - I don't know about you but I'm not sure if I would like to do something like that - first, roaring engine at high rpm at start, then start with spinning tyres, then acceleration with shift points @ 4k or above. Did you tried your acceleration like that? If you really care about performance of your engine, I would suggest you to see how much boost does it have and/or put it on dyno. |
27-03-18, 05:08 AM | #10 | |
Grown up member
Join Date: Nov 2017
Location: Belgium
Posts: 44
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Quote:
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