Turbo on a long trip

[azjl#3]

there we go; someone who RTFM!

almost every truck on the highway is spinning a turbo; they've routinely been doing this for decades already.
follow a guideline like the one shown here (from your Users Manual!) and you won't have any problems.

Please report, reading manual goes against logic.

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[grimmjeeper]

Please report, reading manual goes against logic.

Manual was for 3.0 diesel. Not for 2.0 gasser.

 

[yokramer]

The other huge factor when comparing turbos is boost pressure. The 2.0t tends to run about 12psi I believe. The ecodiesel 24-26psi. Even if you put a 2.0 diesel in it, running double the boost pressure is going to make the same or more heat than the 2.0t gas engine. Combine that with the low hp output of a diesel that small and they'd likely run 35+ psi. At that point I'm betting the little diesel runs hotter by a large margin. Of course the new 2.0t gas version is going to run up to 34psi which could make heat an issue if they put it in the wrangler.

The 2.0 runs in the low 20s for boost according to the gauge the Tazer gives you on the dash.

 

[Zandcwhite]

The 2.0 runs in the low 20s for boost according to the gauge the Tazer gives you on the dash.

Tazer uses MAP sensor for boost so you have to subtract standard atmospheric pressure (14.7 psi at sea level). You're seeing 7-10psi of actual boost the way I undertand it.

 

[grimmjeeper]

Tazer uses MAP sensor for boost so you have to subtract standard atmospheric pressure (14.7 psi at sea level). You're seeing 7-10psi of actual boost the way I undertand it.

If that's the case, my diesel showing 30 psi on the gauge would really be 15 or so...

 

[yokramer]

Tazer uses MAP sensor for boost so you have to subtract standard atmospheric pressure (14.7 psi at sea level). You're seeing 7-10psi of actual boost the way I undertand it.

The Gulia guys are saying they are seeing 22-27psi actually measured so Id would assume around there for the Jeep version. Considering the new one is going to be low 30s in boost and 50-60more hp the low mid 20psi number sounds reasonable.

Edit to add:

From Eurocompulsions site

Turbo pressures are very linear on this tune, peaking at 24psi up from 20-21psi from the factory, sustaining and then dropping back down to 20 near redline. This helps keep catalyst temps under control and allows for a slight bump in spark advance for power without compromising safety.

 

[Zandcwhite]

If that's the case, my diesel showing 30 psi on the gauge would really be 15 or so...

Depends on if the gauge uses the map data or actual boost. The map sensor needs to tell the ecu the total air pressure for tunning and therefore includes atmospheric pressure. Most dedicated boost gauges only measure boost. The tazer uses map data for sure.

 

[ObiMatt87]

I would agree with all the inputs here: In general, this modern engine is not a worry. That said, I had a 1986 Merkur XR4Ti that was a turbo. The cooling on that one really wasn't sufficient compared to the amazing (and complex) systems of today, but it did just fine, even living in Phoenix for a period, where it would reach 115 in the summer. For that one, if I was on a long trip, I would let it idle a bit as it cooled down following a long segment. Today, probably not necessary, but would probably do it just to extend the life of the engine. Turbos are used on everything these days, and the turbo lag I had back then has pretty much been eliminated as well. You should be GTG.

 

[Guv]

Wasn’t too many years ago that big rig turbos just had oil for cooling the center section. The advent of gasoline engines with turbos made the liquid cooling plumbing pretty much a necessity and most diesels today have liquid cooling systems too. The only part of a turbo that cares about excessive heat is the shaft bearing hence the advice to let it cool down a little bit before shutdown. We actually had some, although not common, ball bearing turbos. The ones I worked with were for very small 3 and 4 cylinder engines.

 

[THAW]

Tazer uses MAP sensor for boost so you have to subtract standard atmospheric pressure (14.7 psi at sea level). You're seeing 7-10psi of actual boost the way I undertand it.

Subtracting atmospheric pressure from the Tazer Vac/Boost display isn't necessary.

I monitor Tazer Vac/Boost on the dash while driving (set my EVIC to show the radio on the top/center, and set my Tazer to Vac/Boost), and I just compared it against JScan Manifold Air Pressure; the Tazer does the math.

 

[gato]

I don’t care for the emissions crap on it but I still love it.

And you know what they say about opinions.

Sure, but there is no opinion in the fact that Jeep stopped making the diesel because of the nightmares it caused. You may like it or not. But you can not buy a new one. It is dead.

 

[Guv]

I think a 4 cylinder turbo diesel would be awesome. Sure it would appeal to a small crowd but that reasoning doesn’t stop them from offering the 392.

 

[Zandcwhite]

Subtracting atmospheric pressure from the Tazer Vac/Boost display isn't necessary.

I monitor Tazer Vac/Boost on the dash while driving (set my EVIC to show the radio on the top/center, and set my Tazer to Vac/Boost), and I just compared it against JScan Manifold Air Pressure; the Tazer does the math.

Good to know, so jscan shows ~14psi higher than the tazer displays?

 

[THAW]

Good to know, so jscan shows ~14psi higher than the tazer displays?

Yup. Both gauges move pretty fast, but roughly I saw 15 PSI for JScan MAP when the Tazer transitioned from Vac to Boost.

 

[Tr4ckD4ys]

Good to know, so jscan shows ~14psi higher than the tazer displays?

Yup. Both gauges move pretty fast, but roughly I saw 15 PSI for JScan MAP when the Tazer transitioned from Vac to Boost.

I’m coming to this late and have no context but thought I’d chime in on boost pressures. I have used a JB4 with logging for a while, both in tuned and untuned form.

Stock I see a maximum of 20psi on my MY24 2.0T (I’m referring to MY because these engines were changed a bit from pre-MY24 including who produces the turbo, as well as related sensors and valves). On average I see max 17 psi during normal driving when pushing a bit harder from a stop. To get the 20psi, you’d have to floor it all the way through from 3rd gear to 5th gear.

Tuned I see up to 25 psi, but also just an average of 17-19psi on normal driving.

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