HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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Electric Fans

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Electric Fans

Post  ghostcloak on Sat Nov 20, 2010 2:10 am

I was curious if anyone knew what the max CFM the stock 951 fan is. I have found a couple of options from Summit Racing, both of which are >3600CFM. In standstill traffic with temps >100*, my 300rwhp LT1 would reach up to 205*. A larger radiator is on order, but I'd still like a decent electric fan too cool it off.
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Re: Electric Fans

Post  Arthropraxis on Sat Nov 20, 2010 8:04 am

What radiator and fan setup are you running now? Are you using the Porsche relay for fans or an independent 2 or 3 relay system? There are many people at LS1tech.com running the Taurus fan with a two relay dual speed setup successfully.
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Re: Electric Fans

Post  948 on Sat Nov 20, 2010 4:57 pm

On a 951 radiator you would be hard pressed to find a better fan set-up. If I had a larger radiator I would try and duplicate the stock shroud with two powerfull fans. The best fans are SPAL...hands down.(SPAL makes the Ford fan you mentioned)
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Re: Electric Fans

Post  ghostcloak on Sat Nov 20, 2010 8:33 pm

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This was the radiator I'm looking at upgrading to. Currently, I'm running to stock 951 setup in my 944 (using the Porsche relay for fans). It's adequate for cooling a mild cam LT1.

I'm not saying the SPAL isn't a great company, but I their numbers aren't #1.

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$459 and 4,600cfm

vs

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$449 and 3168cfm

Spal does have a single 3300cfm 16" fan that's worth looking into:
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$209

I've seen similar single 15"/16" fans, with 3000-3300 cfm ratings, but at around $100 more.

Decisions decisions...

I considered the Taurus fan, but have had not luck finding one locally from a 3.8l Taurus Sad


Last edited by ghostcloak on Sat Nov 20, 2010 8:44 pm; edited 1 time in total
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Re: Electric Fans

Post  Admin on Sat Nov 20, 2010 8:39 pm

First off, use a straight bladed fan if you can. It will move more air than the curved fan blades.
Second, both fan setups you posted are to large to fit in between the frame rails in the area of the radiator. Were you going to modify the mounting area? Why not just use the Turbo radiator? It will work just fine even for a built motor.

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Re: Electric Fans

Post  xschop on Sat Nov 20, 2010 8:49 pm

Have you tried a 160* T-stat?
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Re: Electric Fans

Post  ghostcloak on Sat Nov 20, 2010 8:54 pm

Yeah, I realized I would have to modify the mounting area. I know the dimensions are a bit larger...

Why not just use the Turbo radiator? It will work just fine even for a built motor.

I've had this setup for 2 years now with consistent results. When the ambient temp is over 100* (and it gets real humid here in NC too), the setup is barely adequate in cooling the motor with normal driving. Any extended "sprited" driving in the summer risks overheating, so summer track days are out of the question unless it's a "cool" day. Unacceptable, imo. This is my experience.

^ Nope. 190* In the Fall/Winter/Spring, the car warms up and stays at 190* all day just fine. In the winter when I was playing in the snow, the fans never came on (TMK). I suppose I could consider it, but I've detagged the car this winter... Time for an power upgrade (maybe another 100hp or so), so my concern for cooling is even greater. I figured it's time to swap to a QT bellhousing, get the firewall reinforced, the torque tube rebuilt, and upgrade the cooling setup while the motor is pulled.

FWIW, the radiator is setup with an aluminum baffle/shroud so all the air is forced through the radiator.


Last edited by ghostcloak on Sat Nov 20, 2010 8:56 pm; edited 1 time in total (Reason for editing : .)
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Re: Electric Fans

Post  Bluemach1 on Sat Nov 20, 2010 9:10 pm

If your willing to spend the money you can get the exact fit but a two row radiator that is set up to accept the stock dual fans. I have this and the workmanship looks amazing. I havent installed it yet so I can not comment on its performance.

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Re: Electric Fans

Post  Arthropraxis on Sat Nov 20, 2010 9:58 pm

Can the LT1 PCM control the fans like the LS1?
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Re: Electric Fans

Post  Admin on Sun Nov 21, 2010 9:42 am

Yes.

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Re: Electric Fans

Post  Arthropraxis on Sun Nov 21, 2010 10:04 am

You could try running the fans off the PCM using a 3 relay system first. That would be the cheapest and easiest option. Then if that doesn't work switch to a different radiator and fan setup. That way you would already have an improved wiring system in place prior to installing the new radiator and fans.
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Re: Electric Fans

Post  948 on Sun Nov 21, 2010 10:47 am

FWIW, CFM numbers in a catolog mean nothing and you really can't compare each manufacturer with confidence....its kind of like trusting HP numbers from Ford during the 80's and 90's
BTW SPAL has more fans in use by more OEM's than flexalite could even dream about......
You could call SPAL and Flexalite, ask what their test parameters are for their CFM testing, then you can determine if each number can be compared.
I personnally bought comparable fans from Flexalite and SPAL, put them over the stock rad and measured the air flow using a carb flow meter.....the SPAL beat the Flexalite, it drew more current and made more noise too Cool . The stock 951 fans, with their larger spacing from the rad core and deeper fan blades had a higher flow than either....

I would stick with a good 951 rad, stock fans and control it via the PCM.
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Re: Electric Fans

Post  944-LT1 on Sun Nov 21, 2010 11:27 am

using a carb flow meter

How dare you use a British synchrometer on a German car!




.......Damn twin SU's. Laughing I know thats why you even had one. Laughing Laughing

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Re: Electric Fans

Post  ghostcloak on Sun Nov 21, 2010 5:55 pm

^^ You make a very valid and convincing point... I didn't know that the 951 fans were so effective... Alas, I will rewire it in with the PCM and look at upgrading to the al. unit Bluemach1 suggested if I'm still needing more.

Thanks fellas. Very Happy bounce
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Re: Electric Fans

Post  Porch on Sun Nov 21, 2010 6:43 pm

You could always put the stock fans on the back of the radiator, then use just about any other fan on the front as a "pusher".

Are there any cooling mods that can be done to the LT1's? The reverse flow setup just doesn't work very well...
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Re: Electric Fans

Post  Arthropraxis on Sun Nov 21, 2010 7:01 pm

Oil cooler with thermostat?
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Re: Electric Fans

Post  ghostcloak on Sun Nov 21, 2010 9:21 pm

^ That's a brilliant idea. I think my oil runs too cool. Even when I'm pushing the engine hard, oil temp is usually at 200-205*. Only in the summer will it get up to 215-220*. I have an oil cooler, but I need to definitely get a thermostat for it so it's running at a consistent temp in any given situation.

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