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JohnJL's Avatar
 
Join Date: Jan 2005
Location: Toronto, Ontario
Posts: 4,725
Hi guys, sorry for the lapse. I've moved to Toronto, started a new job and am still awaiting the import of the cars...

I promised to post a PSI/Intake air temp graph. Finally got around to it. Here's a 13-second snippet from a log going around the track. The blue line is KPA, it peaks around 13psi. I couldnt get it to show up on the Legend.

You can see that intake air temps as measured at the entrance to the intake manifold goes from 39C to 41C. 40C is about 104F. Ambient temps that day were 29C or 84F.

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2007 911 Turbo - Not a toy
1985 911 Cab - Wife's toy
1982 911 3.2 Indiash Rot Track Supercharged track toy
1978 911 3.0 Lichtbau toy "Gretchen"
1971 911 Targa S backroad toy
Old 03-17-2010, 04:16 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #41 (permalink)
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Join Date: Dec 2002
Location: Seattle
Posts: 659
Someone in this thread said they thought it was geeky to have an IC in/out temp gauge. I disagree. It's one of the only gauges I focus on when I'm on the track on a hot day. On the street, it's highly unlikely that you'll ever reach a dangerous IC outlet temp, so maybe it's not necessary. But on the track, under long periods of sustained boost with limited cooldown, I think it's critical. I was told long ago that if the IC outlet reaches 130 deg or more, it's time to back off or risk high combustion chamber temperatures that may be damaging (i.e., may promote detonation). For those who log and review the IAT sensor from their engine management systems, that's fine. But unless you have a readout for instant feedback, I think it's risky to do a retrospective look at such critical information. Last year, we had a track day in Seattle on the hottest day ever on record; air temps were 103 F and track temps were 150 F. I found that after 7 or 8 laps, even with a massive IC, I'd see IC outlet temps climb above 130 F. By backing down to 7/10 for half a lap every so often, I could bring those temps down very quickly. On normal "hot" days here, I rarely exceed 130, but I can get pretty close.

I use a Davtron in/out gauge, model 307FD. The sensors have been installed in the IC inlet and outlet. On the outlet side, the IAT sensor is right next to it. (BTW, I tapped the IC for the sensor threads; I don't like the idea of a nut on the inside that may get loose.) I can log and review the IAT data as well on my DTA system, but by then it's too late! It's like logging your oil temperature and later finding that you exceeded the limit. The Davtron readout is mounted in a little aluminum box that's placed where the ashtray used to be. In that same box, I have an AFR readout and a couple of electrical switches (one for an oil cooler fan and one to turn on the DTA data logging).

BTW, I happen to have a spare Davtron readout and sensor pair, which I'm willing to sell reasonably. Please PM me if you're interested.

Rob

Here's an early incarnation of my gauge box, when I was running CIS and a 915 transmission. At that time, I was more concerned about frying the transmission than the engine, so I had transmission cooling and a transmission temp gauge.




Then later, I converted to EFI and a 930 transmisson, so I now cared more about frying the engine rather than the transmission, so I put an AFR gauge in the place of the transmission temp gauge. The red switch is for the fan, the black one for logging data to the DTA ECU. Sorry about the glare; it's the only photo I have.

Old 03-18-2010, 10:04 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #42 (permalink)
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Join Date: Jun 2005
Location: Birmingham, Alabama
Posts: 267
Rob930

Any photos showing where you taped the IC for both sensors?

I agree, that's a bad area to have a potentially loose nut.

Thanks
Old 03-18-2010, 10:12 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #43 (permalink)
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drmatera's Avatar
 
Join Date: Aug 2009
Location: Nicholson, Ga
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yes, I would be interested. I was just on Davtrons site last night

email me at sales@racepartsolutions.com
Old 03-18-2010, 10:15 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #44 (permalink)
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Join Date: Dec 2002
Location: Seattle
Posts: 659
Jim,

Unfortunately, I don't have good photos, but here's one that may help. This shows the IC off the car and lying on its back. On the left side of the photo, you can see a brass fitting (that was already in a port on the IC when I got it) that I drilled out and tapped for the Davtron inlet temp sensor. The white wires are the pigtails on each of the Davtron sensors. The actual location of the Davtron outlet temp sensor can't quite be seen in that photo, but it is located in a tapped hole I drilled into the 3 in. pipe that goes from the IC to the TB. The brass fitting on the right side of the IC in the photo is the IAT sensor. So the IAT and Davtron temp sensors are within a few inches of each other. Hope this helps.

drmatera,

Email sent.

Rob

Old 03-18-2010, 12:12 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #45 (permalink)
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Join Date: Mar 2008
Location: So Cal
Posts: 7
Here's where I bought mine - Fjo Racing Products Digital Gauges

It is the Fast Response Air Temp Gauge from FJO. It also says 1 left at the $70 price when I bought mine last April. I bought two via online cart and did not have any issues with Alamo. Don't worry about the sensor, you can pick up the GM open air fast response sensor (like the ones use for Megasquirt) at any of the parts place like Autozone and such.
Old 03-18-2010, 12:26 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #46 (permalink)
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