300tdi Max EGT - Defender Source
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  #1  
Old May 8th, 2011, 12:46 AM
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Neill Thornton
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300tdi Max EGT

OK everyone, time for another blonde question from NDD.

I am feeling froggy about tweaking the VE pump on my 300 tdi. However, I want to make sure I don't bake my turbo in the process. Is there any wisdom out there as far as what is too hot for EGTs? Being here in San Diego we have lots of mesas and finger canyons so being able to not drop to 50-55 on the freeway when a slope approaches would be nice.

But, before I go tweaking the max load fuel amount, I need to know how high I can go. Not looking to make my poor 90 into a F1 car, just trying to get the best out of it. I already have a large intercooler to try and cool down the compressed air.

I tried searching and didn't really find anything. So.... anyone have an idea?
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  #2  
Old May 8th, 2011, 01:12 AM
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I've always heard that 1400 degrees (measured pre-turbo) is the melting point. Lots of guys run 1200 degrees as max. Myself, I limit my EGT's to 1100 since my EGT sensor is after the turbo, mounted in the EGR blanking plate. I find that at max throttle, while carefully watching the EGT's, I can very slowly start backing off the throttle, maintain maximum attainable speed, and watch the EGT's drop without loosing speed.

If your going to increase your fuel, do the fuel screw first, 1/4 turn will make a big difference and 1/2 of a turn will make a huge difference. Be ready for more smoke though. Check out some Dodge Cummins sites as they have VE pumps too and go into alot of detail about improving performance. One site I visited had a Dodge Cummins PU, smoking a Vette in the 1/4 mile.
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Old May 8th, 2011, 02:14 PM
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Neill Thornton
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OK, call me crazy but I thought the EGR plate sits right on the exhaust manifold just before it hits the turbo? Are we talking about 2 different places?

Does anyone disagree with a 1200 degrees pre-turbo maximum?
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  #4  
Old May 8th, 2011, 02:30 PM
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I have a 300tdi and spoke with the tech guys at Garrett about this same issue. I was told that 1330f was max for the turbo by Garrett so just to play it safe I run around 1150f max at my elevation but keep in mind as you climb in elevation the fueling ratio stays the same so they will run hotter with more fuel, less air.
I live at 8000ft and routinely drive to 12000ft so that may not be an issue for you.

Measured pre turbo. if you measure it post turbo you are just guessing.

Quote:
Originally Posted by navydevildoc View Post
OK, call me crazy but I thought the EGR plate sits right on the exhaust manifold just before it hits the turbo? Are we talking about 2 different places?

Does anyone disagree with a 1200 degrees pre-turbo maximum?
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  #5  
Old May 8th, 2011, 03:00 PM
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1300 is fine as a max as long as you have a gauge pre turbo.
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  #6  
Old May 8th, 2011, 03:05 PM
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Neill Thornton
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Right, and the EGR plate sits just before the turbo, yes?
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  #7  
Old May 8th, 2011, 03:06 PM
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Quote:
Originally Posted by navydevildoc View Post
OK, call me crazy but I thought the EGR plate sits right on the exhaust manifold just before it hits the turbo? Are we talking about 2 different places?

Does anyone disagree with a 1200 degrees pre-turbo maximum?

EGR plate is before the turbo on a 300TDi.
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  #8  
Old May 8th, 2011, 03:21 PM
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Neill Thornton
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Thanks Tony, just wanted a second opinion on it before I made a blonde hair mistake and blow something up.
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Old May 9th, 2011, 12:56 AM
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Tony is right the plate is pre-turbo on the 300tdi, sorry, I was thinking of the one on my '85 524td, it's after. The EGT sensor probe tip should sit mid way in the exhaust stream, so I bougt one that is 2" long to get it there.
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  #10  
Old May 9th, 2011, 01:07 AM
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Neill Thornton
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No worries Dennis, just wanted to make sure I was thinking of the right place!
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Old May 9th, 2011, 02:38 AM
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Don't worry about it Dennis, I finally had to go look because I started second guessing!
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  #12  
Old May 9th, 2011, 09:15 AM
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Quote:
Originally Posted by navydevildoc View Post
OK, call me crazy but I thought the EGR plate sits right on the exhaust manifold just before it hits the turbo? Are we talking about 2 different places?

Does anyone disagree with a 1200 degrees pre-turbo maximum?
It is.
I think what you want to do is try and adjust the pump such that you get the performance you want with the min amount of smoke. You then want to watch the egts as you push it up one of those long grades you refer to. I usually downshift @ 1250. The temp drops immediately when you do.
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Old May 9th, 2011, 06:41 PM
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Under throttle, low pressure, on the boost guage, equates to high EGT's and high pressure (good air flow to take away high temp's) equates to greatly reduced EGT's.
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Old May 9th, 2011, 08:16 PM
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max egt

Just remember that Aluminum melts at 1220 f. The cylinder head on a 300tdi is Aluminum. Yes it has cooling water jackets that help but the turbo compressor housing is also aluminum with no water cooling. I am sure there is a way to calculate the amount of heat soak to the aluminum compressor housing to figure out how high you can push it. Cylinder heads are expensive if you warp or crack one on a 300 tdi so play it safe by a couple hundred degrees. Ask me how I know.

------ Follow up post added May 9th, 2011 06:33 PM ------

Check out this link for tuning if you have not already seen it.




http://www.landroverweb.com/Pdf-file...ines_Rev_2.pdf
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  #15  
Old May 23rd, 2011, 11:49 AM
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1328 constant pre-turbo. I try to keep mine below 1000 max. It normally cruises at 65mph between 550 and 700 hundred depends on the load/terrain. Ive touched 1100 for short periods of time though. Anyways I have the 2.8HS TGV turbo on my 300Tdi.

Regards,
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  #16  
Old May 23rd, 2011, 05:26 PM
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Neill Thornton
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Quote:
Originally Posted by defeyago View Post
1328 constant pre-turbo. I try to keep mine below 1000 max. It normally cruises at 65mph between 550 and 700 hundred depends on the load/terrain. Ive touched 1100 for short periods of time though. Anyways I have the 2.8HS TGV turbo on my 300Tdi.

Regards,
This was going to be my next question, I thought maybe my EGT sensor was no good as I wasn't ever over 750, usually hovering about 500.

Looks like I have some wiggle room....
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Old August 4th, 2011, 10:57 PM
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I'm planning on ordering an EGT kit (gauge & sender) from eGauges and install the sender on the EGR blanking plate. To confirm: the EGR blanking plate is pre-turbo, right? So this location should give an accurate reading?

Second question. Has anyone ordered the kit from eGauges before? Do you know if the sender is long enough to fit in this location for a proper read? The site doesn't say how long the included sensor is.
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  #18  
Old August 5th, 2011, 01:31 AM
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Neill Thornton
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Yup, the EGR plate on a 300Tdi is pre-turbo.

I also ordered the VDO kit from eGauges. It will come with a bushing that the probe bolts to. I had Josh (crash303) TIG weld it on to my EGR plate at an angle so that it was sitting in the exhaust stream.

I can take pics in a day or two when I finally get home.
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Old August 5th, 2011, 09:33 AM
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Thanks Neill. No rush at all as it'll be a couple weeks before I get to it. Just wanted to make sure the included probe/sender is long enough. Sorry to hear about all the trouble on your trip.
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Old August 5th, 2011, 09:53 AM
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Quote:
Originally Posted by defeyago View Post
1328 constant pre-turbo. I try to keep mine below 1000 max. It normally cruises at 65mph between 550 and 700 hundred depends on the load/terrain. Ive touched 1100 for short periods of time though. Anyways I have the 2.8HS TGV turbo on my 300Tdi.

Regards,
X2. I've touched 1100 maybe once. around a thousand and I'm laying off a bit on the throttle. I just replaced a cracked head and don't want to do that again. I don't know what caused my cracked head, but it must have happened before I installed my EGT gauge. Now I'm smarter.
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