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  #1  
Old June 5th, 2008, 04:36 PM
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Running hotter

My 110 has been running in the 190 range which makes me happy. I do not have cats so I tuned my MAF to non-cat settings which leaned up the mixture and it runs great and gets 3 mpg better as a result.

I drove on the interstate to the airport and the temp was running in the 205 range which does not make me happy, I was running 60-65 mph. Off the highway the temp comes back down to the 190 range but it is running hotter than it was.

My question is, would leaning up the mixture really make it run that much hotter or is it time to flush the rad?

I am running 50/50 coolant water mix with water wetter.

Thanks for your thoughts.
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  #2  
Old June 5th, 2008, 05:18 PM
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Keith Kreutzer
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Lean usually makes for a hotter burn and more power to a point. More power usually means a bit more heat.

Did this problem arise right after you changed the tune? Can you hear any pre detonation? You may benefit from a set of colder plugs if it's running that much leaner. 3 MPG kinda sounds like you are.

Ceramic coating on the exhaust manifolds can help too (I've heard)
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  #3  
Old June 6th, 2008, 12:02 AM
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Got anything in front of the radiator that may be blocking air flow?
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  #4  
Old June 6th, 2008, 10:18 AM
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No pre-ignition problems, it runs much smoother since the tune change. I set my MAF sensor voltage at 1.15 down from 1.89. I may tweak it a bit but I really like the way it runs.

I have SS headers and put header wrap tape on them which has kept the heat down in the engine bay. The heat is now more intense by my right foot and I am wondering if I am not heating my transmission fluid up since the lines run next to the Y pipe, I am going to shield them with some reflective material and may extend the header wrap further down the exhaust.

I did spray out my radiator fins yesterday and was amazed at the amount of dirt that was still in there. I am pretty good about cleaning up after wheeling but evidently not thorough enough.

I ran the truck in the driveway after cleaning the fins and the temp held at 190 at 2000 rpms sitting still. Good so far but it was not a complete test of the system. I am going to flush the rad on Saturday just for good measure. So I have made a bit of progress but am not convinced that I have totally solved the problem yet.

I will update after the changes mentioned have been made.
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  #5  
Old June 6th, 2008, 12:08 PM
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jim pendleton
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I think a larger radiator core would benefit you.

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  #6  
Old June 6th, 2008, 02:35 PM
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I would go for a larger core in an instant but where do you get one?
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Old June 6th, 2008, 02:39 PM
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I can have one built for you. PM me if you like.

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  #8  
Old June 9th, 2008, 09:40 AM
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Ok so here is the status report.

I flushed the radiator this weekend and have very good flow through the rad. It has a nice swirl on the right side when the cap is off.

On the test drive it ran between 180 and 190 with an outside temp close to 100

Judging from the condition of the flow during the flush I would say that the dirt in the fins was primarily responsible for the rise in temp. There was enough air flow to run normally with ambient temps below 90 but when the outside temps got higher I needed more air flow to cool the engine.
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  #9  
Old March 28th, 2009, 03:27 PM
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Quote:
Originally Posted by landrovered
Ok so here is the status report.

I flushed the radiator this weekend and have very good flow through the rad. It has a nice swirl on the right side when the cap is off.

On the test drive it ran between 180 and 190 with an outside temp close to 100

Judging from the condition of the flow during the flush I would say that the dirt in the fins was primarily responsible for the rise in temp. There was enough air flow to run normally with ambient temps below 90 but when the outside temps got higher I needed more air flow to cool the engine.

How did you flush your rad? Water hose in the back yard?
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  #10  
Old April 7th, 2009, 04:20 PM
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Could you tell a little about how you retuned the MAF? What plugs/ignition are you running? Where can I find a little more on the MAF tuning? I cant recall any other threads Ive read on the subject.
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  #11  
Old April 7th, 2009, 04:30 PM
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S. Smith
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MAF Tuning info...

http://www.v8engines.com/carbs-2.htm

About 3/4 of the way down the page.

EDIT: As for ignition etc. I am running NGK plugs, STI plug wires and a stock coil.
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