Heat soak, what to expect

ShockWave · 06-29-2012, 12:54 PM

when the oil hit 220 the car start to lag. anyone know how to fix it?

Pelican170 · 06-29-2012, 04:35 PM

Man, my car sits at 220F on the regular and i dont notice any slow downs from it... Lucky me

mults · 06-29-2012, 04:56 PM

Quote:

Originally Posted by Montez

Yesterday here it was 107 here in DFW....ughhh I drove the Z to work and midway through my commute it felt much more guttless (oil temp never rose above 200) when I punched it to get on the freeway, later that eve I drove the Max to Nordstrom. After a while it felt guttless to, Vq's just hate heat.

An old article from Oct 09 R/T Observed:

An observation we made over the week was the VQ's sensitivity to temperature. Engines prefer cool weather, but the VQ absolutely detests hot days.

This lack of power is not from the hotter oil temperature, it is from the hotter ambient air temperature. Warm air is less dense, so it makes less power. This is why cooler air makes your car run better. Think of an intercooler for FI.

vividracing · 06-29-2012, 05:54 PM

Quote:

Originally Posted by kenchan

Quote:

Originally Posted by brucelidat

how about an oil cooler? that's not really a performance mod, more of a safety/mechanical maintenance accessory

i suppose a oil cooler is a performance mod cause you can run your engine a lot harder in the same conditions.

ive not seen my oil temp go up that high. 225F is about where i max out even with spirited driving. but my area only goes up to about 95F max..

True, but I really doubt it's going to affect your emissions/inspection. Even California won't trip on that afaik.

Quote:

Originally Posted by kenny's 370z

is it possible to run an inside cab switch to be able to turn the fans on and off and still let the car turn on the fans with a switch hooked up ? i know a guy that did this to an eclipse and it worked great.thoughts ?

Anything's possible

A relay, some wire, toggle switch, and maybe some diodes should get the job done. Just run a 12V wire to a switch, and have the relay trigger the fan(s). I haven't looked at how the fans are controlled on the Z34 so you may need to use some diodes to prevent confusing the BCM or something. I haven't done much hacking on a CAN Bus car.

kenny's 370z · 07-04-2012, 06:43 PM

^ it works when the engine is off but as soon as i start the car,the ecu takes over regardless of the simple switch.if you do find out how to be able to do it with the engine on,id be happy to make a small donation to your favorite charity lol.

binary0x01 · 07-05-2012, 06:57 PM

The AC does help with oil temps, I'm not sure what's up exactly but it is 100% observed since I've got my car, regardless of driving style, AC on = cooler oil temps.

I've not added an oil cooler yet to the stock Nissan water-to-oil one.

Would be interesting to note how much power is actually lost while keeping AC on, maybe around 5 to 10 hp max, I really don't feel much (maybe would on the track though... when I go at some point, only just over 560 miles on mine)

DIGItonium · 07-06-2012, 06:26 PM

Last week temps were so hot that my oil temps almost touch 240F. I don't think it's pulling timing, but more like limiting throttle. I can feel the car accelerating and hitting a wall as if throttle opening was limited. Physically flooring it has no effect. It's a weird feeling, but I "wstar" made a good point about the ECU limiting throttle opening at low revs. This is one really hot summer.

wstar · 07-06-2012, 07:14 PM

Yes, on a stock ECU, turning on the AC will keep oil/water temps a bit lower in the heat. It's because the stock ECU turns on the electric radiator fan(s) at lower temps when the AC is on than when it's off. UpRev can set them to turn on whenever you want regardless of AC

Baer383 · 07-06-2012, 07:20 PM

I'm surprised some of you guys are having issues with oil temp,the past 4-5 day in Atlanta has been 95+ and 3 of those days were over 103deg and my oil temps haven't gotten past 210.

wstar · 07-07-2012, 12:18 AM

Quote:

Originally Posted by DIGItonium

Last week temps were so hot that my oil temps almost touch 240F. I don't think it's pulling timing, but more like limiting throttle. I can feel the car accelerating and hitting a wall as if throttle opening was limited. Physically flooring it has no effect. It's a weird feeling, but I "wstar" made a good point about the ECU limiting throttle opening at low revs. This is one really hot summer.

The throttle limits wouldn't be directly related to heat though, that's just a general thing. This engine does pull timing when things get hot. The ECU is very dynamic about timing. It's looking at very sensitive knock-sensor data and basically always keeping itself just under the threshold of hard knock. So you can think of it as pulling timing in the heat, or adding lots of useful advance when things are cold, but either way it's trying to safely make the most of the available conditions given air temp/pressure, fuel octane, etc.

homeryansta · 07-07-2012, 12:25 AM

yeah, I've been noticing that lately as well. It has been over 100 degrees lately in MN and I have no lower end power. However, when it hits 3.5k rpm or so, there is a burst of power.

DIGItonium · 07-07-2012, 10:57 AM

Thanks for the clarification, wstar. How does this affect your updated throttle tables? I really hate the feeling of not being able to open up the throttle more than anticipated under 2k and even worse when hot.

NissanGuy23 · 07-07-2012, 04:45 PM

ImageUploadedByTapatalk1341693922.311950.jpg

MJB · 07-07-2012, 04:53 PM

Its been in the 100's here in central Texas as well. I can really feel power loss in these conditions. I was thinking about getting a vented hood to try and let some of that heat escape from the engine bay.

Man, I can't wait to get back home to WA state next year!!!! If it gets in the high 80's during the summer, thats considered a hot day for us, lol.

Baer383 · 07-07-2012, 04:59 PM

Quote:

Originally Posted by NissanGuy23

Attachment 50192

That's nothing I have a shot on my phone last week of 115deg.

06-29-2012, 04:35 PM	#47 (permalink)
Pelican170 Track Member Join Date: Jul 2010 Location: Sandy Hook, CT Posts: 972 Drives: Nissan 370z Nismo Rep Power: 16	Man, my car sits at 220F on the regular and i dont notice any slow downs from it... Lucky me __________________ Fast Intentions CF Exhaust - Fast Intentions HFC's - HPS Tubes w/ AFE Dry Flow Filter's

07-06-2012, 06:26 PM	#52 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	Last week temps were so hot that my oil temps almost touch 240F. I don't think it's pulling timing, but more like limiting throttle. I can feel the car accelerating and hitting a wall as if throttle opening was limited. Physically flooring it has no effect. It's a weird feeling, but I "wstar" made a good point about the ECU limiting throttle opening at low revs. This is one really hot summer. __________________

07-06-2012, 07:14 PM	#53 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	Yes, on a stock ECU, turning on the AC will keep oil/water temps a bit lower in the heat. It's because the stock ECU turns on the electric radiator fan(s) at lower temps when the AC is on than when it's off. UpRev can set them to turn on whenever you want regardless of AC __________________ 7AT Track Car! Journal thread / Car setup details

07-06-2012, 07:20 PM	#54 (permalink)
Baer383 A True Z Fanatic Join Date: Aug 2010 Location: Lawrenceville,Ga Posts: 4,293 Drives: My foot up your azz Rep Power: 30	I'm surprised some of you guys are having issues with oil temp,the past 4-5 day in Atlanta has been 95+ and 3 of those days were over 103deg and my oil temps haven't gotten past 210. __________________ 2013 ZL1 754 rwhp 747 rwtq

07-07-2012, 12:25 AM	#56 (permalink)
homeryansta Enthusiast Member Join Date: Apr 2011 Location: Brooklyn Park, MN Posts: 424 Drives: 04 se-r spec v, 370z Rep Power: 14	yeah, I've been noticing that lately as well. It has been over 100 degrees lately in MN and I have no lower end power. However, when it hits 3.5k rpm or so, there is a burst of power. __________________

06-29-2012, 12:54 PM	#46 (permalink)
ShockWave Enthusiast Member Join Date: Dec 2011 Location: houston Posts: 303 Drives: 350z Rep Power: 14	when the oil hit 220 the car start to lag. anyone know how to fix it?

07-04-2012, 06:43 PM	#50 (permalink)
kenny's 370z Base Member Join Date: Jun 2012 Location: TN Age: 58 Posts: 243 Drives: 2012 frontier sv v6 Rep Power: 13	^ it works when the engine is off but as soon as i start the car,the ecu takes over regardless of the simple switch.if you do find out how to be able to do it with the engine on,id be happy to make a small donation to your favorite charity lol.

07-05-2012, 06:57 PM	#51 (permalink)
binary0x01 Track Member Join Date: Jun 2012 Location: Idaho Posts: 892 Drives: 2012 6-SPEED 3.7L Z Rep Power: 14	The AC does help with oil temps, I'm not sure what's up exactly but it is 100% observed since I've got my car, regardless of driving style, AC on = cooler oil temps. I've not added an oil cooler yet to the stock Nissan water-to-oil one. Would be interesting to note how much power is actually lost while keeping AC on, maybe around 5 to 10 hp max, I really don't feel much (maybe would on the track though... when I go at some point, only just over 560 miles on mine)

07-07-2012, 10:57 AM	#57 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	Thanks for the clarification, wstar. How does this affect your updated throttle tables? I really hate the feeling of not being able to open up the throttle more than anticipated under 2k and even worse when hot. __________________

07-07-2012, 04:45 PM	#58 (permalink)
NissanGuy23 Track Member Join Date: Oct 2011 Location: West Chester, PA Age: 36 Posts: 752 Drives: 09 370Z NISMO PG 6MT Rep Power: 15	ImageUploadedByTapatalk1341693922.311950.jpg

07-07-2012, 04:53 PM	#59 (permalink)
MJB A True Z Fanatic Join Date: Aug 2011 Location: Tacoma, WA Age: 41 Posts: 1,498 Drives: a POS truck Rep Power: 496	Its been in the 100's here in central Texas as well. I can really feel power loss in these conditions. I was thinking about getting a vented hood to try and let some of that heat escape from the engine bay. Man, I can't wait to get back home to WA state next year!!!! If it gets in the high 80's during the summer, thats considered a hot day for us, lol. __________________ 09 Nismo #0483 sold. Viper or C7 next time around. Last edited by MJB; 07-07-2012 at 05:01 PM.

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