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TDI Fuel Economy Discussions about increasing the fuel economy of your TDI engine. Non TDI related postings will be moved or removed.

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Old March 28th, 2019, 16:43   #856
fouillard13
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Any update if there was an increase of MPGs?
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Old March 28th, 2019, 19:28   #857
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I got about 2~3 mpg better with high temp thermostat than I did both before and after I ran it. That said, I started getting coolant in my oil (blown head gasket) while I was using the higher temp thermostat, I totally don't know if my issue was caused by or related to the higher temps. I had 2 very loose head bolts (sub 10 ft/lb removal torque). I probably should have just re-torqued, but I tore the head off.
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Old April 3rd, 2019, 04:06   #858
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Dremd,

Loose head bolts? That's scary. I bet you have a warped cylinder head.

The high temp idea is not good. We do think a thermostat that opens at around 90-95c is just fine. Certainly, if it opens 175, you will suffer fuel economy losses, and what is worse, all temperature gauges for about every VW starting in the AHU's LIES. It will be 190 on the dash, but not change from actual temps of 175 to 210. That, in my opinion, is the WORST idea, being lulled into complacency by a worthless temperature gauge. Then, you want to risk the upper boundary of the engine temps? NOT ME.

Just your case alone, dremd, is another part of the problem when you overheat. The head warps high in the middle and you have water blowing out and oil in the reservoir.

Retorquing loose head bolts will not cure a warped head. Neither will ARP head studs fix what is basically, a damaged cylinder head.

Dremd, now that your cylinder head is off, you can easily check for warp. A marginally warped head will bow between the manifold side head bolts and you can see the bridging between boltsby shining a light behind a straight edge.

A badly warped head will allow the camshaft to rock in the journals, when you clean off the oil from cam and cam saddles. The head will need the journals align bored to straighten the cam shaft journals. I don't know too many who do that, but we have the align boring tools.

When we build cylinder heads and blocks, we install a heat tab. The tab has a lead melt out in it's center that is gone at 230 degrees. You don't have to test the upper limits to warp an cylinder head. Regularly being above 200 degrees will do it.

The block will also warp. But it warps in the opposite direction as the head. The low place will be the webs between cylinder bores and can be checked with a machinist's block laid across the head bolts in line with cylinder webs between 1-2, 2-3, 3-4. If you see daylight, it's not flat.
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Old April 3rd, 2019, 05:17   #859
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Quote:
Originally Posted by Franko6 View Post
Dremd,
Loose head bolts? That's scary. I bet you have a warped cylinder head.
.
I sent the head off to YOU in early 2015! I don’t know if you did mill the head, but said it wasn’t significantly warped. You replaced 2 valves, had some comments on head looking like it had high miles (true) sold me a cam and told me to use a machinist straight edge to check block for straightness. I got Starrett 380-24 24-Inch Steel Straight Edge https://www.amazon.com/dp/B0006J4GKK..._QnkPCbFA0045F and I couldn’t get a piece of paper underneath it in any spot with all of the combinations that I could come up with, having the block still in car did limit it some, but I feel ok about it. I used ARP studs to bolt it down which you didn’t really like the idea of, but being a recovering MKIII Supra owner I insisted on.
That was 30,000 miles ago and no more coolant in oil according to Blackstone.

I haven’t driven the car much in the last 2 years due to the delight of EV’s, but every time I turn the key it runs as good as ever
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Old April 23rd, 2019, 17:51   #860
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I performed this mod and are monitoring temps through bluetooth dongle ams torque pro app.
I am seeing average temperatures 212f - 219f.


Reading this thread those temps appear normal.



I want to confirm with you guys this is ok numbers?
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Old April 23rd, 2019, 18:08   #861
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You're fine...
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Old April 24th, 2019, 02:51   #862
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Gates 33209S, Amazon link
This is the [now] 5th mention of this PN (2 or 3 times under Stant) that is also a 195 F thermostat, and first mention in this thread.
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Old April 25th, 2019, 21:07   #863
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Quote:
Originally Posted by Digital Corpus View Post
Gates 33209F, Amazon link
This is the [now] 5th mention of this PN (2 or 3 times under Stant) that is also a 195 F thermostat, and first mention in this thread.
This fits, even with the added piece on the back?
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Old April 26th, 2019, 02:11   #864
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Quote:
Originally Posted by turbovan+tdi View Post
This fits, even with the added piece on the back?
What added piece?

Also, I corrected my typo including an 'F' instead of an 'S' in the PN. Could you please adjust your quote to match?
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