how many degrees to add on egt reading?

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how many degrees to add on egt reading?

Postby rockmike » Wed Jan 30, 2013 2:36 pm

Ive got some differant info from differant peeps.My hx35 has the egt probe in the cast exhaust elbow(this is where the PO put it) How many degrees should I be adding to what my gauge is reading for tru piston air temps?

Thanks.
93 d350 extra cab 5 speed dually.

Mods: hx35,rotated fuel pin,bosch 190 inj.,BHAF with smooth intake tube,3200 rpm spring,M&H dynamic timing spacer,isspro EGT and boost gauge,Auto meter tach, fuel press. gauge.Diamond eye 4" exhaust,Sno Stage 2 W/M kit.

Real trucks dont use spark plugs!
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Re: how many degrees to add on egt reading?

Postby skilletky » Wed Jan 30, 2013 2:41 pm

i think its 250 to 300*f
92 d350, arp's, orings, 150lb springs, 4200 gsk ,ground pin ,64/71/14 ,ddp inj's, ats manifold, tim's tubez, ats trans, FASS, locker, timing + a tooth, bcdd intake

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Re: how many degrees to add on egt reading?

Postby RCCUMMINS89 » Wed Jan 30, 2013 2:47 pm

Depends on some things.....

It'll be slower to heat up when it's in the downpipe. So by the time your engine reaches 1300 your probe may only be reading 800.... but if you keep in it long enough it'll show closer to the real reading.

But the "rule of thumb" is 300. So when you are towing down the road and it reads 700 you are around a grand.
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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Re: how many degrees to add on egt reading?

Postby rockmike » Wed Jan 30, 2013 3:01 pm

Excellant.Ya I was having guys tell me 200* Ithought that was kinda low...then others are telling me 350* 150* range of info? wasnt sure what to trust.Im talkin my readings while pullin a looong grade,thats really the only time im runnin hot.I hate doing math in my head when im pullin a hill,cause im busy watchin my boost trying to keep it under 35 psi,watching my EGT's then adding numbers to it,meanwhile watching my mirrors planning my time to pull out and make the pass on the slow movin big rigs as to not lose rpms...ALOT! going on driving these hoped up tow rigs lol
93 d350 extra cab 5 speed dually.

Mods: hx35,rotated fuel pin,bosch 190 inj.,BHAF with smooth intake tube,3200 rpm spring,M&H dynamic timing spacer,isspro EGT and boost gauge,Auto meter tach, fuel press. gauge.Diamond eye 4" exhaust,Sno Stage 2 W/M kit.

Real trucks dont use spark plugs!
rockmike
fuel screw!!!!
 
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Re: how many degrees to add on egt reading?

Postby dunes450r » Thu Jan 31, 2013 8:58 am

I read someone's info somewhere about having both pre and post turbo probes, and there wasn't a set difference between the two. depending on how high the temp was determined if the spread was greater or less. can't seem to find it now though
1990 W250 getrag, 3.07's, 60k on full rebuild, DAP 5x14's, 12cm WG, 366 spring, 2nd gen IC not hooked up yet
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Re: how many degrees to add on egt reading?

Postby rockmike » Thu Jan 31, 2013 9:30 am

Interesting,I dont like the probe there.Like I said earlier, somtimes you got alot going on in the cab when pullin long hills in traffic,I would prefer to just look at my gauge and know what temps are hitting my pistons and of coarse the actual temp thats hitting my pistons with out doing math.I got a rebuild kit for hx35 when I pull it to rebuild im going to plug that hole in the elbow and drill my exhaust manifold.

Appreciate the great info.
93 d350 extra cab 5 speed dually.

Mods: hx35,rotated fuel pin,bosch 190 inj.,BHAF with smooth intake tube,3200 rpm spring,M&H dynamic timing spacer,isspro EGT and boost gauge,Auto meter tach, fuel press. gauge.Diamond eye 4" exhaust,Sno Stage 2 W/M kit.

Real trucks dont use spark plugs!
rockmike
fuel screw!!!!
 
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Re: how many degrees to add on egt reading?

Postby rockmike » Thu Jan 31, 2013 9:37 am

Off topic now: you guys mind givin a stab at what HP range y'all think im at with my truck?Hoping to get it on a dyno this spring so I know.

Fuel screw is a ways from run away,quite a ways away from that I believe,I run about 35psi WFO Full synthetic throughout the drivetrain.

Thanks!
93 d350 extra cab 5 speed dually.

Mods: hx35,rotated fuel pin,bosch 190 inj.,BHAF with smooth intake tube,3200 rpm spring,M&H dynamic timing spacer,isspro EGT and boost gauge,Auto meter tach, fuel press. gauge.Diamond eye 4" exhaust,Sno Stage 2 W/M kit.

Real trucks dont use spark plugs!
rockmike
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Re: how many degrees to add on egt reading?

Postby RCCUMMINS89 » Thu Jan 31, 2013 9:42 am

275 range to the ground.
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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Re: how many degrees to add on egt reading?

Postby Tacoclaw » Thu Jan 31, 2013 11:45 am

I'd bet around 200-230, do you have an upgraded lift pump?
1990 W250 4x4
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Re: how many degrees to add on egt reading?

Postby rockmike » Thu Jan 31, 2013 12:43 pm

Yes I do,it runs at about 13-14 psi at cruise.I think im close to 275 teasing 300hp the truck runs hard!I was goin around a gradual corner the other day at about 40 mph in 4th gear and stomped on it a bit and it broke the duals loose :shock: and went slide ways :shock: but whatever its at im pretty damn happy with my truck now,shes got strong fuel press with awsome volume and runs strong! :mrgreen:
93 d350 extra cab 5 speed dually.

Mods: hx35,rotated fuel pin,bosch 190 inj.,BHAF with smooth intake tube,3200 rpm spring,M&H dynamic timing spacer,isspro EGT and boost gauge,Auto meter tach, fuel press. gauge.Diamond eye 4" exhaust,Sno Stage 2 W/M kit.

Real trucks dont use spark plugs!
rockmike
fuel screw!!!!
 
Posts: 94
Joined: Mon Jan 21, 2013 3:58 pm
Location: Benton City,Wa.
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Re: how many degrees to add on egt reading?

Postby RCCUMMINS89 » Thu Jan 31, 2013 1:25 pm

Ya... the more I think about it you might be around that 300+ mark. Even though you don't have a maxed pump and have small injectors, it is moving quite a bit of fuel. I can tell from your egts, boost, and what you pull the pump down to.
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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Re: how many degrees to add on egt reading?

Postby Diesel Dawg » Fri Feb 01, 2013 1:52 pm

On post turbo egt keep it below 975-1,000 and youll be ok. You can pull sustained mountains at that temp.
92 D-350 reg. cab,dually,c.t.d.,auto,3.54s,fuel screw 2+turns,smoke screw3 turns,star wheel all the way down,,B.H.A.F.,,gauges,DennyT stage 2 pin,366 spring next!!!
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Re: how many degrees to add on egt reading?

Postby bmoeller » Sat Feb 02, 2013 11:34 am

Some say, kind of figure the spread on the EGTs as 10* per 1# of boost. Still think that may be a bit on the low side.
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Re: how many degrees to add on egt reading?

Postby RCCUMMINS89 » Sat Feb 02, 2013 11:43 am

Um..... I could almost buy that.

at 30# the spread would be 300, at 40 400.... I would say it is a little low though.
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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Re: how many degrees to add on egt reading?

Postby cougar » Sat Feb 02, 2013 11:59 am

dunes450r wrote:I read someone's info somewhere about having both pre and post turbo probes, and there wasn't a set difference between the two. depending on how high the temp was determined if the spread was greater or less. can't seem to find it now though

That might have been me. I have never seen more the a 200° split in all conditions. It all depends on were your probes are relative to each other.
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92 W250 HD 47RH with Compushift. Upgraded H1C to 62/60/16, Scheid Lightning VE, 60# valve springs, DAP 7X.010 injectors, 4" DE exhaust, home made cooler tubes.
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