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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Controlling the water temps on the track

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Re: Controlling the water temps on the track

Post  docwyte on Thu Oct 02, 2014 12:11 pm

Where'd the content go on some of our posts?

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Re: Controlling the water temps on the track

Post  docwyte on Thu Oct 02, 2014 1:05 pm

Well, I looked around and the carbon fiber ones weren't a whole lot more, so I bought them, along with the hood scoop.

Hopefully this helps, I'd love coolant temps to not exceed 210F...

http://roadracemotorsports.com/store/index.php?main_page=product_info&cPath=81&products_id=2113
http://roadracemotorsports.com/store/index.php?main_page=product_info&cPath=81&products_id=852

Just got home and was able to measure the hood to make sure these would fit. I was freaking out a little about that and am happy to report there's plenty of space for them...

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Re: Controlling the water temps on the track

Post  zeusrotty on Thu Oct 02, 2014 6:55 pm

Doc did you get my email on the vent?

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Re: Controlling the water temps on the track

Post  racertomtom on Thu Oct 02, 2014 9:51 pm

Rich L. wrote:Steel ones that I used.

http://www.928motorsports.com/parts/louvers.php

Rich, are these 26 gauge louvers about the same thickness as the hood skin or are they thinner?

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Re: Controlling the water temps on the track

Post  docwyte on Fri Oct 03, 2014 10:31 am

Eric,

I did and I was about to buy the vent when I noticed where it would ship from. I need these no later than this coming Wednesday and that didn't look possible. So I decided to get the matching hood vent from Road//Race.

I'm really hoping I see a 20-30 degree drop in water temps from these...

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Re: Controlling the water temps on the track

Post  Lemming on Fri Oct 03, 2014 12:26 pm

docwyte wrote:
I'm really hoping I see a 20-30 degree drop in water temps from these...

Doc, are you running an under tray as well? If not, you need to.
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Re: Controlling the water temps on the track

Post  docwyte on Fri Oct 03, 2014 1:27 pm

Yep, I have my front splitter, than an aluminum piece that starts before the splitter stops and extends back.

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Re: Controlling the water temps on the track

Post  racertomtom on Fri Oct 03, 2014 9:45 pm

This is an interesting 3 part article on differential pressures, which creates cooling flow using undertrays, spoilers, and vents.

http://www.autospeed.com/cms/article.html?&A=2159
http://www.autospeed.com/cms/article.html?&title=Undertrays-Spoiler-Bonnet-Vents-Part-2&A=2160
http://www.autospeed.com/cms/article.html?&title=Undertrays-Spoiler-Bonnet-Vents-Part-3&A=2162

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Re: Controlling the water temps on the track

Post  docwyte on Fri Oct 03, 2014 11:54 pm

Interesting articles.

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Re: Controlling the water temps on the track

Post  Lemming on Sat Oct 04, 2014 7:05 am

Read those articles long ago.  Here is the aero chart for a 924, notice that the greatest negative pressure is a the beginning of the hood and extends back to just above the middle of the wheel.  This is the place to put your vents.

Note:  up is negative pressure on this graphic.  The pressure differentials also show why you need to run the rubber strip between the firewall and hood, it keeps high pressure from entering from the base of the windshield (think cowl induction for the entire engine bay; therefore increased engine bay pressure and less flow through you radiator).

Edit: just reread the thread and Rich posted this on page 1

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Re: Controlling the water temps on the track

Post  money pit 951 on Sat Oct 04, 2014 3:58 pm

Can people share the temps they're seeing and where they are being measured?

I've year to see any water temp problems with the car. Water temp is measured on the pass side head and usually hovers around 205(ish). I have a high flow water pump and an aftermarket all Al rad (forget which one it is)
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Re: Controlling the water temps on the track

Post  944convert on Sat Oct 04, 2014 4:58 pm

docwyte wrote:Hmmm, ok, so a naca duct or reverse louvers on either side there would help...

I think I'm going to drop the car at the body shop to have them open up the front license plate area, the header panel and maybe vent the hood too...
That's exactly where the 924 Turbo NACA duct is located(over the right side exhaust manifold). Just mirror it to the left side as well. Suck that exhaust manifold heat right outta there.

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Re: Controlling the water temps on the track

Post  Lemming on Sun Oct 05, 2014 9:47 am

money pit 951 wrote:Can people share the temps they're seeing and where they are being measured?

I measure mine on the rear of the passenger head. I'm hoping the new broad foot nose, ducting, and under tray help to keep my temperatures down. Two weeks ago at Barber, my temps never went above 210oF. Ambient temp was high 80's/low 90's and sunny.

Prior to that the car typically ran in the 220 range, sometimes getting to 230 in a hot race. Interestingly, my oil temps rarely exceed 220, measured in the pan.

I'm also running a high flow water pump with a two row griffin radiator.
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Re: Controlling the water temps on the track

Post  docwyte on Sun Oct 05, 2014 11:32 am

Turns out my Autometer water temp gauge reads 10F high. I'm also measuring from the passenger side head.

So at it's peak, temps were around 240F. Earlier this summer I saw 230F. On the street I rarely see over 180F. I'm hoping the hood vents and reverse scoop create enough negative pressure to draw more air through the radiator as well as vent the heat from the headers to keep water temps to no more than 210-220F.

Oil temps could be as high as 270F on track, I'm hoping that the new front mounted oil cooler and vents help with that too.

Bad combo of ambient temps of close to triple digits (track temps of 120+) and high altitude here...

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Re: Controlling the water temps on the track

Post  Rich L. on Sun Oct 05, 2014 1:33 pm

My setup is a Wizard radiator with stock fans, opened up 944 n/a bumper and vents in the front part of the hood. Temps measured at the back of the passenger head using the factory gauge in the dash. I see 220-230 F water temps when I run in the Oregon desert at 100 F ambient and 2500' of elevation. But running up here in Seattle close to sea level and 80 F ambient the water runs at 160-170 F which is the thermostat opening temp.

My oil temps push 250 with an RX7 oil cooler in place of the intercooler behind a vented nose panel. This is measured in the thermostat before the cooler.

Rich
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Re: Controlling the water temps on the track

Post  docwyte on Sun Oct 05, 2014 4:03 pm

Now add another 3500' of elevation Rich and you'll experience what I am...

My setup is a RH/RD radiator, holes cut in the OEM turbo front bumper, dual 11" Spal fans, SLP 160 degree thermostat and an Evans water pump, with front splitter and undertray.

About to add the reverse hood scoop and louvers.

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Re: Controlling the water temps on the track

Post  zeusrotty on Sun Oct 05, 2014 8:27 pm

You may want to switch to a circle track radiator like mine if all of this doesn't work.

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Re: Controlling the water temps on the track

Post  phlip on Mon Oct 06, 2014 7:40 am

zeusrotty wrote:You may want to switch to a circle track radiator like mine if all of this doesn't work.

Got any pics, specs or model number of the radiator you're running? Is circle track the brand?
How was install and fitment?
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Re: Controlling the water temps on the track

Post  docwyte on Mon Oct 06, 2014 8:45 am

I'm not sure I can fit any larger of a radiator than what I have now. Street temps, if anything, are too cold, it's sitting around 170-180F on the street.

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Re: Controlling the water temps on the track

Post  money pit 951 on Mon Oct 06, 2014 8:59 am

docwyte wrote:I'm not sure I can fit any larger of a radiator than what I have now.  Street temps, if anything, are too cold, it's sitting around 170-180F on the street.

That just sounds low - esp if 170 gauge was really 160 since you said it was reading 10F high. What thermostat are you running?
I wouldn't want 170 at the head - I would think carbon buildup and incomplete burns would be an issue
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Re: Controlling the water temps on the track

Post  docwyte on Mon Oct 06, 2014 9:05 am

SLP 160 tstat. It is what it is. I'm more concerned about what the track temps are.

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Re: Controlling the water temps on the track

Post  money pit 951 on Mon Oct 06, 2014 9:27 am

docwyte wrote:SLP 160 tstat.  It is what it is.  I'm more concerned about what the track temps are.
But you're running a thermostat, right?
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Re: Controlling the water temps on the track

Post  docwyte on Mon Oct 06, 2014 9:28 am

Yes. An SLP 160 tstat.

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Re: Controlling the water temps on the track

Post  948 on Mon Oct 06, 2014 12:07 pm

docwyte wrote:Yes.  An SLP 160 tstat.
Doc, I found that the LT1 SLP low temp stat had a smaller open cross sectional area than the standard temp unit; ~15% less.....Both were Wahler brand, IIRC
Though I doubt something like this would solve all your problems, it couldn't hurt to ensure you have the most flow possible....in general, more flow means more cooling.
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Re: Controlling the water temps on the track

Post  zeusrotty on Mon Oct 06, 2014 1:03 pm

i am running this radiator.

http://www.summitracing.com/parts/gri-1-85201-h

Mounting was done with aluminum brackets. Super easy and you could DIY. The car is in now getting new heads and a new cam and tune so i cant really take pics. I am also running dual 10" spal fans at 2200 cfm a piece. i did have to have a bug hole put in the lower left of the rad for the stock Porsche temp sensor. It works really well.

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Re: Controlling the water temps on the track

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