So, you think that’s hot; I’ve recorded a transient peak IAT of 130C/266F in a heat soaked dyno situation, on a 101F day.

 

For those looking to measure core-in and core-out temps, here's a probe and fitting that would fit perfectly into the bungs of the DFIC:
http://www.pace-sci.com/temperature.htm
Check out the PT916 probe and the fitting below it.
Not too expensive, but you'd have to get a gauge...which might be expensive. My Davtron runs about $160 retail.

cheers,

 

When there was first talk about the VGS and higher IAT's, this was my first (and really only) possible reason. It still makes sense to me. Your BPV leak scenario is not somthing I thought of though... I would think that would be easy to troubleshoot though, like by experimenting with a stiffer, and looser spring...

Still have the VGS, at least for now...

 

If I made a 4 channel unit that read values to a compact fash card and a user selectable display (individual temp readings or deltas), I think I could do the control unit for about $100. Display for about $50 and probes could be these guys listed from Pace for $20 each... That would be about $250 for a four channel set up with logging. Anyone intersted?

Matt

 

Might want to check with Peter first before going through the effort .

Would love to see what you envision for a display... I think it would be quite popular, esp for those with a DFIC...

 

Just a bit. There is also the adjustment of the BPV butterfly. Generally this is done in concert with the VGS.

 

I was thinking about that too, but one catch with this is one would have to have higher boost to have higher temps..... Enough so that it woulsd show up on the boost gauge or T-MAP reading.....

Matt

 

Ahh, hello?? Where do I sign? Do you take PayPal...??
I'm first in line after the other guy...
btw, the Davtron displays are great--little rectangles about 2"x1". 4 of these in line, or in a 2x2 matrix would be fantastic.

thanks, Matt!

 

If you come to MOTD07, please come join us up on the hill for our first annual Mini OCD gathering

 

you can also get some vfd (vacume) displays that have been removed from cahs registers and such. I spent a great deal of time programming one to display temps from 4 temp sensors in my computer on the front of my case. You can get them in back lit as well for very cheap... usually 4 lines by 8 characters for less then 20 bux. I also have diagrams for the circuit boards I made... not sure if they would be the same for you as mine were just serial ports and a controller chip.

I'll dig up those links, my software and diagrams

 

Yep...
The "great little rectangles" gave him away didn't it?

 

I knew he wouldn't be able to get these out of his mind...

 

Actually, I love those little red displays, Sid...
My friends want to go back to AMVIV in 07, but I'd rather go to the Dragon. However every time I look at the map, it seems further to go there than to Las Vegas. I wonder why?
Still, a meeting of the really OCD NAMers would be a sight to see. Is Monk coming too...?

cheers,

 

I'd get in line for that Matt! thanks for asking.

 

Sign Me Up!!!

 

Here's the deal, the higher the restriction, IC core, the more heat the SC will make. The heat soak condition just adds to the issue. I think 1 of the reasons we don't see these high IATs are because of core flow. For an efficent IC to work properly there is a carful balence of core flow & exterior TE. The testing that I did this summer, with the VGS & without was almost worthless, just way too hot to tell, but in the rain, the little time I had, the VGS only made a less than 2% temp difference.

I would expect Dr Phils temps to be higher because of climate, compared to here, but they are, % wise, too high IMHO. As we say, while resting under the car, on the creeper, with a pillow, "sumpin aint right......"

 

Could be & Captin America, maybe.

 

Your temps from what I remember are similar to mine. Forgot what IC you're running.
2% eh? Not much difference.

 

Well, the worst thing I ever did was get the temp probes! Since my reported temps are so much higher than everyone else's now I'm obsessed with finding an explanation for the observations. Here are some of the ideas I've come up with:
1. The probes are reading something more than the air temperature. They are SS and mounted to the IC body, albeit with rubber grommets to reduce direct heat transfer.
2. The probes are reading incorrectly. They read ambient temperature correctly, so I doubt it's this.
3. The meter is not calibrated, but it is a high quality unit that appears to accurate.
so, if the readings are correct, then why so high?
4. The altitude (5000ft) causes IATs to be much higher than at lower altitudes.
5. It could be the VGS, but I removed it, and temps are still very high.
6. My airbox temperatures are very high, but how?

Ah, I give up. I might just remove the probes and plug the holes in the DFIC up... Did I say I have an obsessive personality?
cheers,

 

Obe, yes we did have similar results. 2% in the rain, in the 80s and real bad air. You know air can be pretty good in the rain ( not that day ). The only thing from that thread that I don't remember was heat soak recovery, I think it was good? I do know I liked the interior of the GSR. I have a Forge. The last we had any thoughts on the 2 designs was with the exterior fin density, the Forge being less than less than any IC I've seen.

Phil, a Zen moment would help. Realy, where are you going with these numbers? They won't make the IAT issue go away without a new mortgage & a vacation from work ( the day job ) so you can realy get your teeth into the 6 issues. If the car is running well & you're giving those GTI guys a whipping, that's all that counts, right?

After spending a bunch of time ( who cares ) fabing a box for my K&N, heat fences w/ insulation for under hood heat management, using most of my 16g aluminum ( that I care about ), I took it all out to pollish it ( cause I thought - after gathering some numbers ) and everything worked better ( how about this for a run on sentence ), what. Woah, I'm another one of those white guys in a Vonage ad... It would have been cheaper to break the picture window.. I gave away all the polished bling, realy cool ( kwel is more better ), under hood Mini parts. I think I'm all better now.
1 I don't wake up at 3:30 AM any more
2 I don't feel the need to buy more stuff to make sure the stuff I make doesen't work
3 The belief that you spent good money on crap is true. The JCW crew will back me on this 1 ( they even have a team - they buy some craptistic stuff for their cars, then brag about it. Who knew? )
4 The purpose of money is to make sure the government & the citizens of the US of A are safe from possible problems with Ketchup
5 Have no clue of what to write for 5
6 IMHO #6 is a realy neat number

See? Now you won't need a week at Betty Ford

 

Ah, Steve, that was just I needed, thanks. Actually, while you were writing your words of wisdom I ordered a little cheepie gauge with probe to measure the temperatures in the airbox. It will help in figuring out if my FAD is doing anything good, and in the spirit that Matt expressed, it will give me a little more information about the air getting in to the intake system.
Time to think about something else...
again, thanks.
(PS I am thinking of putting the VGS back as the 3200 rpm flatness is killing me, and it goes away with the VGS)
cheers,

 

Well one thing seems to have come of this. The VGS isn't a major heat issue.

Remember Phil, there's a built in help system here.

 

random Q for you all since you are the **** OCD set about this and will be sure to give me good advice. I can pick up a used Alta core for $250. Silly to spend more for a newer direct flow design, or is there that much difference? My goal for this car was bang for the buck mods only (promise to the wife....famous last words, I know).

 

Well, just my HO, but for the money, that's a great deal! Make sure you get the Alta diverter, and modify it, and a really big scoop--the M7 Ram Intake is the best scoop for this cooler I believe.
There is also a thread here talking about smaller mods using insulation, that will help get the most out of that IC.

cheers,

 

Yer splitting hairs really.
For the $450 dollar difference you won't gain much. Yes there are minor pressure drop differences and the DFIC may have some cooling advantages but $450 will buy you some other nice goodies.
Like I'll sell you my old Alta intake without the tube for $50 you pay the shipping.