Lowering Exhaust Temps

[Patriot_RAM]

Hey Guys,



I'm running a TST PMCR with the standard program (for now), stacked with an EZ on level 3. When I run the TST on 5/6 or 6/7, I get a TON of power and the EGTs are reasonable. When I turn the TST up to 8/8, it feels like I'm getting even more power, and the boost gauge tells me that I probably am (it goes higher than when I'm on 6/7).



My question is about the temps. With the TST on 8/8, I'm seeing temps that are WAY too hot. What's the best thing to do to cool this puppy down with what I have?



Different wastegate setting? Nitrous? Water/Meth? Suggestions?



Thanks!

 

[TCluff]

Hey Guys,



I'm running a TST PMCR with the standard program (for now), stacked with an EZ on level 3. When I run the TST on 5/6 or 6/7, I get a TON of power and the EGTs are reasonable. When I turn the TST up to 8/8, it feels like I'm getting even more power, and the boost gauge tells me that I probably am (it goes higher than when I'm on 6/7).



My question is about the temps. With the TST on 8/8, I'm seeing temps that are WAY too hot. What's the best thing to do to cool this puppy down with what I have?



Different wastegate setting? Nitrous? Water/Meth? Suggestions?



Thanks!

how much boost are you running, water meth is a good choice, your engine will handle 60 psi with no sweat, well at least it will hold as long as you dont let the egts go to high, what are you seeing for egts now, where is your pyro probe located????????????

 

[Diesel Nut]

Maybe and intake horn (banks or ats) or an intercooler upgrade? The banks intercooler comes with the intake horn. Not a banks fan myself, but they do make some good parts! Maybe a rocktech crank sensor to give you a little more timing when into it. You must be making some good power, huh?!



Second thought here, what fuel press are you seeing at these levels, and how hot is too hot? Does it feel like it falls on its nose? I just wonder if you are draining the rail and the injectors aren't spraying so much as dribbling.

 

[BigGunZ]

1st step... . air
2nd step... . air
3rd step... . air
etc.
etc.
etc.

(air meaning, both in and out)

 

[BIG BOB]

Have you checked your "Drive Pressure"?



My drive pressure was way to high, thus creating alot more heat. I removed the Edge Boost Elbow (I might mention that my highest boost with the Edge Elbow was 40#'s) and replaced it with the stock elbow. I still could not get them down to match the boost level. My Drive Pressure is 52#'s and my boost is 39-40#'s max. So I still have the same boost level as with the Edge Elbow. But have done this, my EGT's have dropped 60*'s. It hard and takes alot of time to hit 1500 now at WOT over 100 mph, and those temps are only in OD. Never come close to those temps in 1st, 2nd or 3rd.

 

[Patriot_RAM]

My boost on those higher settings is in the 60psi range. The EGTs are getting high -- I'm not sure how high, but high high. Will water-meth increase the boost? I really want to be in the 55 psi range... My pyro is on the manifold just behind where it turns down to go to the turbo.



Regardless of my power settings, the fuel pressure on the low pressure side stays fine, usually around 15psi, even at WOT. I haven't really noticed it feeling like it runs out of fuel in the rail, but it's hard to tell for sure without being on the dyno. It feels like a smooth power curve all the way to 3k rpm.



As far as air -- I have an airraid intake, AFE torque tube, SPS66 turbo, 4" turndown / downpipe and 5" straight pipe exhaust.



Big Bob -- I'm assuming that "drive pressure" is the amount of pressure in the exhaust manifold, is that correct? If so, I've never measured that. Is there a gauge available for this? I'm assuming it's something like the boost gauge, but I'm assuming the plastic tubing would melt if I used one of those. Or... . That might not be what drive pressure is since I'm not 100% sure.



Thanks for the info thus far!

 

[bmoeller]

I've heard that you still use a boost and and the nylon line, but you get a length of copper tubing. Attach the one fittingto the manifold, then to the copper (coiled up), then the nylon to the gauge. The coiled copper gets rid of the heat.



Never done it yet, but that was how it was explained to me.

 

[BIG BOB]

Big Bob -- I'm assuming that "drive pressure" is the amount of pressure in the exhaust manifold, is that correct? If so, I've never measured that. Is there a gauge available for this? I'm assuming it's something like the boost gauge, but I'm assuming the plastic tubing would melt if I used one of those. Or... . That might not be what drive pressure is since I'm not 100% sure.



Thanks for the info thus far!

You are correct. I use a 60# DiPricol boost gauge with a copper line. I just take out the EGT probe and attach the copper line, should be the same fitting, and run it into the cab from the passengers side. Then go for a spin and check drive pressure with the boost level.

 

[JStieger]

drive pressure

Here's my drive pressure setup:



https://www.turbodieselregister.com/forums/showthread.php?t=143546



Here's where I measured the boost versus drive pressure of my SPS 66 until 40 psi, when my wastegate activated:



https://www.turbodieselregister.com/forums/showthread.php?t=143838



Maybe you're draining the rail pressure causing the fuel to not atomize properly thereby making smoke and heat??? With 100 Hp injectors I feel comfortable EGT and boost wise to run with the MP-8 on 40-50% plus TST twins on 4x4. I can't remember what the rail pressure was, but if the roads are good (no snow) I'll check tomorrow.



I haven't tried running with the MP-8 off yet to see what is the highest I can run the TST up to yet as I kind of like running with a bit of extra pressure + TST on timing only. The MP-8 definitely give a bit of a low end kick around town.

 

[Patriot_RAM]

This is really good information guys. I appreciate the input.



Here's another question -- If I'm draining the rail, obviously I need to back the fueling off just a tad. If I was to add a snow performance system, what does it use to increase the hp/tq? Do I have to get more fuel to the engine, or does the water meth itself increase the power?



Where's a good place to look at rail pressure gauges? My current gauges are white face with black bezel.



Thanks!

 

[JStieger]

Where's a good place to look at rail pressure gauges? My current gauges are white face with black bezel.

If you do a search under TDR member Matt400, you'll find more than enough info! If you don't want to buy the SPA gauge you can hook up a digital multimeter to the fuel rail pressure sensor before the signal is manipulated by the pressure box and measure the voltage off the middle wire (run the leads into the cab). In the search you'll find a table that list the rail pressure versus voltage so what you'll look for is whatever minimum voltage corresponds to say ~13,000 psi rail pressure (based on other people's dynos where HP was observed to drop off). If you see this minimum voltage, you have to back off on the settings. If you don't see this voltage, then increase the settings until you do.

 

[DPKetchum]

How about more/bigger intercooler?