Boost VS EGTs

[AndrewKing]

HI All,



I'll be towing alot of sod here shortly... . the trailer weight will be a maximum of about 14K (lawn is big and I'll be making many trips so as not to exceed the GVW of the trailer)... ... I haven't gotten up the nerve to tap the manifold yet to install the EGT guage and I have heard that it is possible to exceed safe limits w/ a relatively stock truck..... My question is, can I use my boost guage as a rough indicator of how hot the EGTs are?..... Anybody have any rough idea what sustained running at 15 lbs boost is in terms of EGTs?... Are there any charts or formulas that can be used so I know how or hard or easy I need to be on the accelerator?... . I won't be speeding, since most of the roads

are windy 2 lane roads although there will be a stretch of highway I can run it up to 55 or so... . I usually tow 3500 lbs or so regualarly for the lawn care business I am in but I will be taking it easy with all that additional weight.



Thanks for any and all help



Andrew

 

[bgilbert]

Whadda ya waiting fer? Tap that manifold!

My question is, can I use my boost guage as a rough indicator of how hot the EGTs are?.....

NO.

Anybody have any rough idea what sustained running at 15 lbs boost is in terms of EGTs?

Could be fine, could be nuclear meltdown.

Are there any charts or formulas that can be used so I know how or hard or easy I need to be on the accelerator?... .

NO. GET R DUN! You'll have no idea til you do.

 

[BJMarshall]

I have found on mine and several others that I have worked on that as long as I don't let the boost get over 20 the egt's will stay at or under 1200 when loaded heavy. I know our trucks are modified differently, but it takes fuel to make boost, and the turbo is on the map at least to 25. If you aren't fueling enough to make over 25psi then I wouldn't worry too much. Keep the turbo well within its map, and your egt's won't get too high.

All of this is assuming everything else is in order. No boost leaks, or plugged air filter, rpm's kept up, etc.

Don't worry about tapping the manifold. Piece of cake.

Barry

 

[tugboatphil]

Andrew,



Ditto what Bill said. If you're worried about shavings dropping inside, it can be avoided. I was changing exhaust housings when I installed my pyro probe. If you aren't going to do anything else, consider taking the bolts out, that secure the turbo to the manifold. Stick a piece of cardboard in between and put a couple bolts back in. Do your drilling and tapping. Vacuum out the shavings and you'll have it done.



Good luck!

 

[TKingsbury]

I towed a few times before I got gauges, and a few times since. I've found if you keep the boost somewhere in the middle of 0 and max and keep the revs up (engine won't be working too hard) you'll be A-ok.

Travis. .

 

[AndrewKing]

Thanks guys... . maybe I'll bit the bullet and try tapping the manifold since the weather is supposed to be nice the next couple of days... ... I am really curious about those EGTs... .

Andrew

 

[BushWakr - RIP]

If you do the 'fish 'N drill' method you'll be just fine... . On the other hand if you prefer to remove the turbo you can follow tugboat's method with one variation... . just stuff some rags into the exhaust manifold well past were you're drilling and then drag them out when you're done... . just don't forget to remove them when yer finished... . don't laugh it has happened before. .





pb... .

 

[Mel Fuelling]

M&W turbo kits for farm tractors(30 years ago) had instructions to drill and tap the exhaust manifold while running the tractor at a fast idle (1,200rpm).

I have installed several pyrometers this way with no problems. Using this method on inline 6 cylinder motors has always seemed to produce a steady outbound air flow for me. Wear good eye protection though!!

Mel

 

[Greenleaf]

I don't care to work on things attatched to the engine. I prefer to remove the item(s) as opposed to lean oiver the grille/fender. If you have to tap, it's much easier to remove the manifold and work on the bench and vice. You have to replace the blown out exhaust gaskets anyway. And port the manifold. And get down under the turbo to fix that oil leaking and. and. and... ... ... ... ... .



The same is true with governor spring installation. Might just as well pull that pump and replace ALL the potentially leaking o rings. Yada yada yada



Just my . 02 worth guys.



-S

 

[JLEONARD]

Mel, I actually like that idea... I may try it next time...

Talk about a HOT job!! :-laf :-laf

Jay

 

[BushWakr - RIP]

Jay, you're just plain twisted dude..... Ohhh... . get some goggles and a bit 'O muffler wrap for your soon to be blistered/sooted up ole puss... ... geeezzzz.....



pb...

 

[JLEONARD]

Jay, you're just plain twisted dude

Hey... I resemble that remark :-laf :-laf