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Date:         Tue, 31 May 2005 18:53:49 -0600
Reply-To:     Martin Jagersand <jag@CS.UALBERTA.CA>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Martin Jagersand <jag@CS.UALBERTA.CA>
Subject:      Re: Hi-Power TDI Vanagon observations
Comments: To: mailinglist@FASTFORWARD.CA

Hi David,

Your hi powered TDI observations are quite interesting. Especially that you can keep it cool enough despite the increased power.

FYI: My 1.9TD has nearly the same EGT readings: around 400C at 100-110 km/h highway and up to 800C in long hard climbs.

Jake Russell who was active on the Diesel list several years ago found that there was a direct coupling between EGT change and intercooler efficiency. Ie at 15psi boost the post turbo temp is often in the 100C range. Using an oversized intercooler (Jake found that the Audio 5000 one worked quite well, but it's a lot bigger than the TDI one), the post IC temp can be brought to almost ambient (e.g. 20C). Then measuting EGT with and without intercooler the EGT dropped nearly the same amount as the intake temp.

I tried to put the big Audi 500 IC in my Vanagon setup, but it is a tight squeeze, and I never found a good reliable solution. (Same setup as yours with IC behind drivers side tail light).

I was curious if you have before and after IC temps for different boost pressures and airflows through the IC?

How do you wire your IC fan? Always on? Or temp controlled? At highway speeds does it need to be on? (I'm thinking there might be a pretty good airflow through the air channel anyway)

Cheers, Martin


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