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Old 01-08-2014, 08:27 PM   #1 (permalink)
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Grill block / Heat in transmissions...?

Hi, I admire lots of the work people have done here with aero mods but I do wonder about some of the parts that are not monitored by temp gagues. Auto transmission fluid in power steering and teansmissions gets very hot and its life is shortened greatly by high temps. A quick web search will give many sites that show a direct relationship between temp and fluid life.

My 98 V6 cmary has a trans oil cooler ans a small power steering fluid cooler (this is just a loop of metal tube with the fluid passing through it. It is about 1.5 feet ling and it sits in front of the radiator).

Grill blocks would reduce the airflow over these parts and as there is no temp gague for them I would never know how hot they are.

A gearbox or power steering failure is a huge cost, probably more than a lifetime of fuel saving from the grill block, even more frequent servicing of these things would probably eat up the money saved in fuel.

I have not heard any mention of this issue, possibly with the gentle driving it is not an issue? Anyone had any problems or thoughts?

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Old 01-08-2014, 08:42 PM   #2 (permalink)
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Welcome!
you might look at my posts on the Infiniti Q45.
I installed a digital trans temp gauge when I couldn't recode the scangauge.
I also ran twin trany coolers, a 9" and 7"
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ECO MODS PERFORMED:
First: ScangaugeII
http://ecomodder.com/forum/showthrea...eii-23306.html

Second: Grille Block
http://ecomodder.com/forum/showthrea...e-10912-2.html

Third: Full underbelly pan
http://ecomodder.com/forum/showthrea...q45-11402.html

Fourth: rear skirts and 30.4mpg on trip!
http://ecomodder.com/forum/showthrea...tml#post247938
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Old 01-08-2014, 08:44 PM   #3 (permalink)
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see this thread:
http://ecomodder.com/forum/showthrea...ion-22573.html
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MetroMPG: "Get the MPG gauge - it turns driving into a fuel & money saving game."

ECO MODS PERFORMED:
First: ScangaugeII
http://ecomodder.com/forum/showthrea...eii-23306.html

Second: Grille Block
http://ecomodder.com/forum/showthrea...e-10912-2.html

Third: Full underbelly pan
http://ecomodder.com/forum/showthrea...q45-11402.html

Fourth: rear skirts and 30.4mpg on trip!
http://ecomodder.com/forum/showthrea...tml#post247938
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Old 01-08-2014, 08:52 PM   #4 (permalink)
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how hot is your trans getting? my car has been a bottom breather only for years, haven't done anything with the trans fluid since before that, and the fluid still looks great
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Old 01-08-2014, 08:55 PM   #5 (permalink)
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i think the power steering issue would be relative to vehicle weight, i've disabled mine, so i wouldn't think it ever really had to work that hard... actually it probably created more extra heat than actually did work
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Old 01-08-2014, 11:02 PM   #6 (permalink)
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Thanks for those links and info, I have no idea how hot my trans is, but as I think about a grill block the trans temp is a concern.
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Old 01-09-2014, 05:54 PM   #7 (permalink)
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heat

Quote:
Originally Posted by matt36415 View Post
Hi, I admire lots of the work people have done here with aero mods but I do wonder about some of the parts that are not monitored by temp gagues. Auto transmission fluid in power steering and teansmissions gets very hot and its life is shortened greatly by high temps. A quick web search will give many sites that show a direct relationship between temp and fluid life.

My 98 V6 cmary has a trans oil cooler ans a small power steering fluid cooler (this is just a loop of metal tube with the fluid passing through it. It is about 1.5 feet ling and it sits in front of the radiator).

Grill blocks would reduce the airflow over these parts and as there is no temp gague for them I would never know how hot they are.

A gearbox or power steering failure is a huge cost, probably more than a lifetime of fuel saving from the grill block, even more frequent servicing of these things would probably eat up the money saved in fuel.

I have not heard any mention of this issue, possibly with the gentle driving it is not an issue? Anyone had any problems or thoughts?
*On the highway,an automatic transmission's torque converter would be locked,operating at the same mechanical efficiency as a manual (about 96%).
*Transmission heat is a function of transmitted power.
*If the grille block is lowering overall drag,then the transmitted power at any given speed will be lower,and the transmission should actually run cooler.
*Since some automatics are actually sharing the lower manifold of the radiator,the transmission,by design,may be operating at around 230-degees F.,governed,otherwise,by the engine thermostat.
*The power steering has essentially nothing to do on the highway and the ram-air flow volume of cooling air,is enormous compared to any heat flux coming off the power steering cooler.
*Modern cars are using a complete suite of full-synthetic lubes,which can withstand temps to 700-degrees F without undoing their designer long-chain molecules.
*In urban driving,the thermal clutch-fan,or electric cooling fan should protect everything.
*Internal ducting, guide vanes,and turbulence screens of a proper grille-block actually increase the delta-P across the radiator/heat-exchangers,increasing the efficiency of the factory cooling system,making the fan's work even easier.Which justifies the blocking.
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Old 01-10-2014, 10:08 AM   #8 (permalink)
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Unless you're towing or traveling through mountains, you're probably going to be fine.

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