[urq] Dialynx rad vs Stock rad w/ Aux rad delete

[Ingo Rautenberg]

Gerald,

In a roundabout way, it  seems (to me) to hinder/reduce needed  
airflow over the engine and turbo.  This doesn't mean I would  
automatically delete the aux rad.  But if it's leaking and you're not  
in a really hot climate, I'd bypass it rather than replace it.  This  
assumes, of course, you're not spending a great deal of time in stop  
and go traffic :-)
Maybe someone here has made real-world tests?

Ingo

On Sep 30, 2006, at 10:10 PM, gerald ward wrote:

> I don't understand what the auxiliary radiator would be blocking  
> airflow to. Could you tell me/
> Gerald
>
>
>> From: Ingo Rautenberg <i.rautenberg at waratap.com>
>> To: Maurits Jonkergouw <urq at moregraphics.nl>
>> CC: Audifans <urq at audifans.com>
>> Subject: Re: [urq] Dialynx rad vs Stock rad w/ Aux rad delete
>> Date: Sat, 30 Sep 2006 16:10:35 -0400
>>
>> Maurits,
>>
>> If the radiator fits and you're not upgrading the turbo (aside from
>> normal function) I doubt this should pose a problem.  I'm still using
>> my original radiator with the auxiliary bypass.  I haven't yet
>> installed the Dialynx (which I bought years ago when I bought my
>> '83.  And I have the K24 upgrade (which necessarily heats the
>> coolant) and have boost at 2.2 bar (1.2 bar over ambient) and haven't
>> had any issues. IME the auxiliary radiator serves to impede airflow
>> more and isn't all that useful.
>>
>> Best,
>>
>> Ingo
>>
>> On Sep 30, 2006, at 7:26 AM, Maurits Jonkergouw wrote:
>>
>> > Recently my main rad has gone bad (amongst other things) and needs
>> > to be replaced. The aux rad was deleted a long time ago (also
>> > leaked) and never noticed increasing water/engine temps, not even
>> > during high speed travelling in summer. Although I have to say
>> > during this hot summer my exhaust manifold cracked at several
>> > places, but that's just coincidence :-)
>> >
>> > So, do we really need the aux rad? IIRC my water temp only went
>> > from 1 bar 'below normal' to 'normal', but I must say this was with
>> > a very inefficient turbo.
>> >
>> > But what if the turbo is back up to spec again (after rebuild),
>> > what if the exhaust manifold is replaced with the performance
>> > Dialynx EM? More performance is more heat.
>> >
>> > I was looking at the high capacity rad from Dialynx but it's not
>> > cheap. I do have a good stock 48cm main rad from a CoupeQ but it
>> > lacks the extra aux rad header. I've read in the archives a few
>> > people had no problems what so ever removing their aux rad while
>> > keeping the stock rad.
>> >
>> > What do you think, is it safe to delete the aux rad and keeping the
>> > stock rad considering a Dialynx EM and rebuild turbo will be  
>> fit ???
>> >
>> > To be honest with you, I need to cut some repairs in order to save
>> > money. If the aux rad could be removed while keeping the stock rad,
>> > this would be a major cost-saver.
>> >
>> >
>> > Regards,
>> > Maurits
>> >
>> > 1986 GV (Swiss WR)
>> > 1985 CGT KV
>> > 1982 GL DD
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>