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03-29-2018, 08:32 AM
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#1
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Name: JustinP8770
Title: Rookie
Status: Not Here
Join Date: Jul 2017
Location: Southeast, Nebraska
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Posts: 14
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Max momentary egt
Finishing up a 12 valve rat rod build and having more egt issues than we expected. What is the maximum egt we should allow on a stock internal 12 valve in a manual transmission rat rod application that only lasts while you are in it between shifts? Thank you
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03-29-2018, 09:15 AM
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#2
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Name: Snedge
Title: Comp Diesel Sponsor
Status: Not Here
Join Date: Sep 2006
Location: Western Pa.
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Posts: 18,832
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What a loaded question. "How hot is too hot"?
-Depends on why it's hot
-Depends on how well it runs.
-Depends on how much un-burnt fuel escapes the tail pipe.
-Depends on the definition of momentary
-Depends on how much work the Rat is actually doing at these high temps
How hot is hot? What are you seeing?
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03-29-2018, 09:34 AM
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#3
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Name: JustinP8770
Title: Rookie
Status: Not Here
Join Date: Jul 2017
Location: Southeast, Nebraska
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Posts: 14
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Id say it runs darn good. Smokes black but when we try to turn it down a little performance drops off drastically. Id say temp is up there for a couple seconds. Will peg 1800 degree pyro.
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03-29-2018, 09:37 AM
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#4
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Name: WUnderwood
Title: CompD Minion
Status: Not Here
Join Date: Aug 2006
Location: Texas
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Posts: 8,418
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I'd check for boost leaks first.
Also, I see you are new to this forum. Welcome sir. The more information you can give us regarding the fuel/turbo(s)/timing/trans/pistons/rods/etc, the more we can help you. "Hot" is a very relative term.
__________________
2011 Ford F-150 Lariat 4X4
RIP BFD99, jponder, and Forrest Nearing
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03-29-2018, 09:59 AM
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#5
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Name: DISTURBED
Title: YEA WE RIDE THE SHORT BUS
Status: Not Here
Join Date: Nov 2007
Location: Winchester, Va
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Posts: 6,417
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Timing could play a big part in this as well as injector and turbo combo. Whats the specs on the build?
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Thanks, Jeremy
01 CTD Retired sled puller, dedicated "Twin Turbo" tow rig
96 CTD "TOO" Disturbed 3.0 - Built by Disturbed Diesel Performance
96 CTD "The Sickness" 2.6/2.8- Built by Disturbed Diesel Performance
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03-29-2018, 10:00 AM
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#6
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Name: JustinP8770
Title: Rookie
Status: Not Here
Join Date: Jul 2017
Location: Southeast, Nebraska
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Posts: 14
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1997 engine. Stock rods, pistons, rings, and cam. Fire ringed. 5x.013 injectors, 61.5mm s300, intercooled, I don't think we have boost leaks. Reading 60 lbs of boost at intake manifold. I went thru a diesel shop and had them help me set this up but the sales person I was dealing with that selected turbo, injectors and set my pump up he left the business before we got it running. They installed 5k gsk and he said one step below full cut dv's
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03-29-2018, 10:05 AM
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#7
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Name: JustinP8770
Title: Rookie
Status: Not Here
Join Date: Jul 2017
Location: Southeast, Nebraska
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Posts: 14
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Timing is 18. they said i was flowing just short of 500cc
Last edited by JustinP8770; 03-29-2018 at 10:11 AM.
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03-29-2018, 10:08 AM
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#8
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Name: 95cummins5.9
Title: Old man ***** gossiper
Status: Not Here
Join Date: Jun 2012
Location: U.S.A
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Posts: 4,715
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Who's 5x13s? How you like them? I'd bump timing to 24 ish if it's a toy.
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03-29-2018, 10:21 AM
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#9
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Name: wwentzler
Title: Diesel Enthusiast
Status: Not Here
Join Date: Jan 2017
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Posts: 152
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first issue is that s362 is way way out of efficiency map
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03-29-2018, 10:26 AM
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#10
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Name: CorneliusRox
Title: Seasoned Rookie
Status: Not Here
Join Date: Dec 2012
Location: Detroit, MI
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Posts: 4,154
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I've seen plenty of budget built 12V pullers peg a 2200F gauge all the way down the track and just keep working.
Just don't let your coolant boil and I think you'll be okay.
__________________
Corey - BSME '21 Tesla Model 3 Perf
'22 DMax AT4 2500
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03-29-2018, 10:28 AM
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#11
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Name: JustinP8770
Title: Rookie
Status: Not Here
Join Date: Jul 2017
Location: Southeast, Nebraska
Member`s Gallery
Posts: 14
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Scheid, ya id say I like them but haven't really driven it very far yet. She is a heck of a runner
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03-29-2018, 10:33 AM
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#12
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Name: Redrider2911
Title: Too Much Time
Status: Not Here
Join Date: Nov 2015
Location: Yakima, WA
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Posts: 780
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External gate?
__________________
49 Willys Pickup. 5600lb. 11.8sec @115mph 1/4. 12 valve. MegaSquirted 47RH. 3.54 posi rear. 35" tires. 64mm HE351ve, S475 (75/96/1.32), A/W Intercooler. AFC mods. 5x16s. 191 DVs, 180 pump. 23*. 85psi. Build Thread
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03-29-2018, 10:34 AM
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#13
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Name: Redrider2911
Title: Too Much Time
Status: Not Here
Join Date: Nov 2015
Location: Yakima, WA
Member`s Gallery
Posts: 780
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And of course. We need pics of the rat to fully diagnose your issue.
__________________
49 Willys Pickup. 5600lb. 11.8sec @115mph 1/4. 12 valve. MegaSquirted 47RH. 3.54 posi rear. 35" tires. 64mm HE351ve, S475 (75/96/1.32), A/W Intercooler. AFC mods. 5x16s. 191 DVs, 180 pump. 23*. 85psi. Build Thread
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03-29-2018, 10:38 AM
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#14
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Name: JustinP8770
Title: Rookie
Status: Not Here
Join Date: Jul 2017
Location: Southeast, Nebraska
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Posts: 14
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Non waste gated.
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03-29-2018, 10:40 AM
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#15
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Name: turbo2387
Title: Nipple Fluffer
Status: Not Here
Join Date: Jun 2011
Location: Indiana
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Posts: 665
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60psi from a single s362? Holy $hit!!!! Is this turbo wastegated? It clearly needs a gate or more of it. My bet is your drive pressure are off the charts. Shoot for high 40’s psi. Tune the gate and take some top end fuel away.
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03-29-2018, 10:42 AM
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#16
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Name: Redrider2911
Title: Too Much Time
Status: Not Here
Join Date: Nov 2015
Location: Yakima, WA
Member`s Gallery
Posts: 780
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Also. Anything else done to the pump besides the comp cuts and GSK? I would probably suggest going to a smaller DV and definitely put an external gate on that thing. I too am curious to what your drive pressure is.
__________________
49 Willys Pickup. 5600lb. 11.8sec @115mph 1/4. 12 valve. MegaSquirted 47RH. 3.54 posi rear. 35" tires. 64mm HE351ve, S475 (75/96/1.32), A/W Intercooler. AFC mods. 5x16s. 191 DVs, 180 pump. 23*. 85psi. Build Thread
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03-29-2018, 10:44 AM
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#17
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Name: Redrider2911
Title: Too Much Time
Status: Not Here
Join Date: Nov 2015
Location: Yakima, WA
Member`s Gallery
Posts: 780
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Quote:
Originally Posted by JustinP8770
Id say it runs darn good. Smokes black but when we try to turn it down a little performance drops off drastically. Id say temp is up there for a couple seconds. Will peg 1800 degree pyro.
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Manual transmission? You letting off for the shift, losing spool, then slamming the throttle right after the shift and that's when your EGTs jump and then they come back down after you get back on top the turbo? Or are they that hot through a full WOT pull?
__________________
49 Willys Pickup. 5600lb. 11.8sec @115mph 1/4. 12 valve. MegaSquirted 47RH. 3.54 posi rear. 35" tires. 64mm HE351ve, S475 (75/96/1.32), A/W Intercooler. AFC mods. 5x16s. 191 DVs, 180 pump. 23*. 85psi. Build Thread
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03-29-2018, 10:50 AM
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#18
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Name: Snedge
Title: Comp Diesel Sponsor
Status: Not Here
Join Date: Sep 2006
Location: Western Pa.
Member`s Gallery
Posts: 18,832
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1800 Doesn't scare me. I promise you that turbo is scared though.
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03-29-2018, 10:51 AM
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#19
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Name: JustinP8770
Title: Rookie
Status: Not Here
Join Date: Jul 2017
Location: Southeast, Nebraska
Member`s Gallery
Posts: 14
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Yes letting off to shift. The egt build as the rpm builds. Never stayed in it long enough to see if they come back down
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03-29-2018, 10:52 AM
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#20
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Name: JustinP8770
Title: Rookie
Status: Not Here
Join Date: Jul 2017
Location: Southeast, Nebraska
Member`s Gallery
Posts: 14
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