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Old 05-15-2012, 10:08 AM   #1 (permalink)
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will EGT effect water temp on a TDI

I have a small cooling issue when climbing over passes in Colorado. I want to put a bigger intercooler on the rover to help power and wanted to know if anyone has experience with a bigger intercooler helping lowering water temp.

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Old 05-15-2012, 10:26 AM   #2 (permalink)
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I suspect a better radiator would have a better effect?

Depending on age etc it could well be bunged up with gunge.
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Old 05-15-2012, 10:38 AM   #3 (permalink)
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Thermal load.

If the EGT is high, the thermal load in general is high. Reduce the EGT, and the coolant temp will drop.

Not saying a bigger intercooler will be MORE effective than a 'better' radiator for coolant temps - but the rest of your engine will thank you.
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Old 05-15-2012, 12:06 PM   #4 (permalink)
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Quote:
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Thermal load.

If the EGT is high, the thermal load in general is high. Reduce the EGT, and the coolant temp will drop.

Not saying a bigger intercooler will be MORE effective than a 'better' radiator for coolant temps - but the rest of your engine will thank you.
Both would probably be a better idea. According to my radiator contractors, intercoolers are rarely the cause of any problems as they don't get gunked up like radiators do. They may corrode but inside, they are usually pretty good.

A fan clutch might be a good idea as well depending upon the conditions of overheating. Fan clutches are inexpensive and easily replaced.
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Old 05-15-2012, 12:39 PM   #5 (permalink)
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well you cant climb passes balls out...

egt is important, but an intercooler is blocking airflow, which is thin to begin with.

how is your fan? mine is LOUD (working hard/locked) on passes.
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Old 05-15-2012, 01:51 PM   #6 (permalink)
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Intercoolers do get blocked/plugged oil accumulates inside and sucks up dirt and soot if you have an EGR.

Lower EGT's will help cooling a bit but not much. But retarding the timing a few degrees will raise EGT and lower coolant temps a bit. but all of this is a "bit".

As I recall Ed your running pretty conservative on your EGT's though. I would inspect your cooling system and upgrade where possible.
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Old 05-15-2012, 02:22 PM   #7 (permalink)
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I have a newer 5 core radiator and electric fan with ajustable temp setting, over Vail pass temp started to climb so I slowed down. I have the old clutch fan so I think I will switch it out and test it over vail pass.



Ed

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Old 05-15-2012, 03:42 PM   #8 (permalink)
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Show us your electric fan?
Some are very good, but many (aftermarket) electric fans are junk. Do you have a cowling around your fan?

A bigger intercooler is always a good thing, lowering the inlet manifold temps will reduce the cooling load a little. IDI engines have had overheating problems avoided by fitting an intercooler, but IDI engines put out a lot more waste heat than di engines do.

Last edited by Dougal; 05-15-2012 at 03:45 PM.
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Old 05-15-2012, 04:40 PM   #9 (permalink)
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I exploded my heater hoses over Vail pass last summer... running too much go pedal...

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Old 05-15-2012, 04:59 PM   #10 (permalink)
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Quote:
Originally Posted by rock90 View Post
electric fan with ajustable temp setting,

Ed
Dear Lord, why?

The mechanical fans worked for a LONG time, but NO, everybody wants a fancy electric fan...

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Old 05-15-2012, 08:08 PM   #11 (permalink)
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I love electric fans. They are far superior if you get a properly sized one. I converted my 1300l unimog to an elec fan and the results have been huge over the old power hungry belt setup.

I find elec fans to be even better suited for diesels.

Ed, post up some pics of your fan setup.
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Old 05-15-2012, 09:43 PM   #12 (permalink)
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I run electric on the tdi also, been like that for years. Sensor in the bottom hose.

Fan is from some car, its a big 5 blade job complete with metal shroud and fits the tdi rad with minimal fuss.

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Old 05-16-2012, 08:55 AM   #13 (permalink)
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When I say it runs high temp I mean it runs high in the normal range. normally run in low part of normal temp range for gauge

I run a Kenlow electric fan because of the winters in Colorado. It never runs in winter.
I like the electric fan. I get a little better mpg and I have better access to engine.


I got the one with the highest CFM they had. it cover the entire radiator. I have the old clutch fan and shroud.

I am getting a Allisport large radiator size intercooler and I think that will fix it.

Last edited by rock90; 05-16-2012 at 08:59 AM.
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Old 05-16-2012, 10:06 PM   #14 (permalink)
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Quote:
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When I say it runs high temp I mean it runs high in the normal range. normally run in low part of normal temp range for gauge

I run a Kenlow electric fan because of the winters in Colorado. It never runs in winter.
I like the electric fan. I get a little better mpg and I have better access to engine.


I got the one with the highest CFM they had. it cover the entire radiator. I have the old clutch fan and shroud.

I am getting a Allisport large radiator size intercooler and I think that will fix it.
You need to post some pics.

It sounds like you have a round fan with no shroud on a rectangular radiator.
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