1.8 Turbo system design questions
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1.8 Turbo system design questions
Hi guys,
Just wanted to learn more about how the 1.8T manages boost and how its plumbed in the engine bay, etc. I had a couple of 944 Turbos that I modified in the past, but my knowledge of the 1.8 is scant. Here's the gist of my questions:
How and where is the turbo located and plumbed to the exhaust and intake?
How is the wastegate controlled and plumbed?
Size and capacity of stock turbo?
Why no intercooler? (audi marketing driven, or technical reason?
Is there a bypass valve that opens on upshifts to balance hot and cold sides of the turbo?
I'm trying to learn how advanced the system is to decide what upgrades are practical. My 89 944 Turbo S could manage 320hp out of a 2.5l 4 cyl with just wastegate and exhaust mods, without excessive engine stress of overheating problems.
How does the 1.8 stack up?
Thanks
Jp
03 Avant
Reno,Nv
Just wanted to learn more about how the 1.8T manages boost and how its plumbed in the engine bay, etc. I had a couple of 944 Turbos that I modified in the past, but my knowledge of the 1.8 is scant. Here's the gist of my questions:
How and where is the turbo located and plumbed to the exhaust and intake?
How is the wastegate controlled and plumbed?
Size and capacity of stock turbo?
Why no intercooler? (audi marketing driven, or technical reason?
Is there a bypass valve that opens on upshifts to balance hot and cold sides of the turbo?
I'm trying to learn how advanced the system is to decide what upgrades are practical. My 89 944 Turbo S could manage 320hp out of a 2.5l 4 cyl with just wastegate and exhaust mods, without excessive engine stress of overheating problems.
How does the 1.8 stack up?
Thanks
Jp
03 Avant
Reno,Nv
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Joined: May 2001
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Here's a pic of the layout. The rest of your questions would be a treatise so I suggest you use the
<center><img src="http://pictureposter.audiworld.com/19399/1.8t_engine_with_descriptions.jpg"></center><p>forum search and do a little reading. Then come back with questions if any remain.
![[ej257]'s Avatar](data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 50 50'><circle class='avatar-circle-default' fill='%23c5773e' cx='25px' cy='25px' r='20px'></circle><text class='avatar-text-default' x='49%' y='53%' fill='white' text-anchor='middle' alignment-baseline='middle'>[</text></svg>)
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to start...it is intercooled
intercooler is behind the driver side fog.
Second, K03 turbo stock (quite small)
BPV is used-location depends on MY
turbo is located towards the front passenger side between the motor and airbox and down a bit.
wastegate is electronically controlled-N75 valve
chip will up boost, timing, and a/f etc-good for 205-215hp depending on MY.
Turbo upgrades for 97-2001 1.8T's are PES T28, APR STG3, AWE/Neuspeed/Wetterauer K04.
Second, K03 turbo stock (quite small)
BPV is used-location depends on MY
turbo is located towards the front passenger side between the motor and airbox and down a bit.
wastegate is electronically controlled-N75 valve
chip will up boost, timing, and a/f etc-good for 205-215hp depending on MY.
Turbo upgrades for 97-2001 1.8T's are PES T28, APR STG3, AWE/Neuspeed/Wetterauer K04.
Thread Starter
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Joined: May 2003
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Re: Here's a pic of the layout.he rest of your questions would be a treatise so I suggest you use
Suggest I use the......what?
Also, your diagram shows an intercooler. The A4 doesn't have one, I thought?
JP
Also, your diagram shows an intercooler. The A4 doesn't have one, I thought?
JP
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Re: it most certainly does use an IC. He said to use the search for further questions
So much for salesman knowledge.
At what boost level does the stock intercooler loose efficiency? Would replacing it be helpfull if running a stage 1 APR chip, or is it up to that task? (my 944 intercooler was so good that no one has improved on it, even running 400+ Hp)
At what boost level does the stock intercooler loose efficiency? Would replacing it be helpfull if running a stage 1 APR chip, or is it up to that task? (my 944 intercooler was so good that no one has improved on it, even running 400+ Hp)