egt temps when towing

[6.5 MONEY PIT]

hey guys I just added the fsd , 80 hp ssdiesel chip , air intake, duramax fan upgrade, I tow a 7500 lb travel trailer I dont have any gauges yet and I was woundering if any of you have had the temp of the egts go up with simlar mods as I post up above while towing , I cant afford the gauges just yet and I dont want to toast anything until I can get them and be able to monitor the boost and egts thank Dan

[Husker 6.5]

hey guys I just added the fsd , 80 hp ssdiesel chip , air intake, duramax fan upgrade, I tow a 7500 lb travel trailer I dont have any gauges yet and I was woundering if any of you have had the temp of the egts go up with simlar mods as I post up above while towing , I cant afford the gauges just yet and I dont want to toast anything until I can get them and be able to monitor the boost and egts thank Dan
Based off of what you listed for modifications, I sincerely hope that you also added 4" exhaust when you chipped the truck. The reason is that with the increased fueling from the 80 hp chip, your EGT's will soar if you can't get rid of the exhaust gasses quickly. The stock exhaust system, especially the turbo downpipe, can barely handle the stock engine under load. Of the two, opening up your exhaust flow is more important than opening up your intake if you're adding more fuel, to keep your EGT's down. If you didn't add an exhaust system, I personally would do that before adding gauges if where I had to spend limited funds mattered.

That being said, whether you installed an exhaust system or not, without gauges the best thing you can do for your engine' health and longevity while towing is KEEP YOUR RIGHT FOOT OUT OF THE ACCELERATOR PEDAL!!! Having all that power on hand is tempting to use, but the farther down the go pedal goes, the higher EGT's go. Getting on max boost and fueling will drive EGT's up quickly, especially under the load of towing. Drive moderately until you have the ability to monitor the vitals. If you can only afford to add one gauge at a time do EGT 1st, then trans temp, then boost. Reason: the chip limits boost to 15 psi constant, high tranny temps will cost you $2G+ for a rebuild, but high EGT's will cost you an engine and turbo at $5G+.

Hope this helps.

Husker 6.5

[sixnickel]

I agree with Husker 6.5 100% But I would put the old chip back in till you had a EGT Gage or the 4" exhaust. Running the way you are is like playing Russian Roulette with 2 rounds in the gun. Your going to be pulling that hill and that Power Joke starts to pass you we can't have that so you push a little harder on the throttle I almost got him! Just a little more, you know the story!! personally I feel gages are the first thing that way you can see whats going on with all the other improvements.

[w_huisman]

hey guys I just added the fsd , 80 hp ssdiesel chip , air intake, duramax fan upgrade, I tow a 7500 lb travel trailer I dont have any gauges yet .... .... I cant afford the gauges just yet and I dont want to toast anything until I can get them and be able to monitor the boost and egts thank Dan

If you can't afford gauges, you can't afford a new engine. Pull that chip until you can afford one, or the other. ;)

I guarantee your EGT's easily get into the danger zone without pulling any load. Pulling that 7500lb trailer, well.....:eek:

It's your truck, do what you like.

BTW: EGT's can still get excessive with a larger exhaust. IMO----> GAUGES FIRST - Exhaust is a distant but definite second.


95 6.5L 3/4tn 4x4 Suburban Boat Puller: 215,000 miles, 4L80e, "F" VIN, 4.10's, relocated pmd,
home-made Turbomaster, Flowmaster Crossover, 3" Flowmaster Downpipe, 3-1/2" Straightpiped
exhaust, 285/75/16 Revos, boost & pryo gauges, hi-idle switch, 98 HO waterpump, chipped,
single 190deg RobertShaw stat, Injectors @ 210,000, 5521 IP & Timing Set @ 215,000

[6.5 MONEY PIT]

hey guys I do have a 3" exhaust already I removed the cat and have a raven hi flo muffler, I all so had a 3" cross over pipe made, I guess my next question would be even if I had the gauges how do you keep the temp from going up , is it just laying off the gas pedal or if I turn down the boost on my boost controler for the turbo ? and can the engine temp gauge give any indication if the temps in the egt are up or is that just the engine its self. I also already rebuilt the trans so I dont want that again ,, thank for your help

[Husker 6.5]

hey guys I do have a 3" exhaust already I removed the cat and have a raven hi flo muffler, I all so had a 3" cross over pipe made, I guess my next question would be even if I had the gauges how do you keep the temp from going up , is it just laying off the gas pedal or if I turn down the boost on my boost controler for the turbo ? and can the engine temp gauge give any indication if the temps in the egt are up or is that just the engine its self. I also already rebuilt the trans so I dont want that again ,, thank for your help

A 3" exhaust system isn't much larger than the stock 2.75", however the biggest improvement is the 3" aftermarket turbo downpipe vs the stock "squashie". A 3" crossover doesn't make any difference as the key is getting rid of gasses post turbo.

94 up boost is controlled by the computer, about 7 psi max. stock, 15 psi max. with Walt's 80hp chip, unless you're running a mechanical wastegate controller. If you are, and have a boost gauge, under load you should not exceed 15 psi. If you do, back off the adjuster. Too high of boost pressure without extensive internal engine mods to a stock 6.5 will blow head gaskets, break head bolts or bend rods:eek: :eek: !

REMEMBER: More boost in and of itself does NOT equate to more power in a diesel, it means more available air for combustion. More FUEL equates to more power, and needs more air to be combusted, and larger diameter exhaust to get rid of the increased combustion gasses. OVERFUELING (black smoke out the tailpipe) is BAD, it drives EGT's dangerously high very rapidly, as can too small of an exhaust doing the same thing, too (increasing EGT's by restricting the exhaust flow). I have seen pictures of an aquaintance's chipped Cummins with stock exhaust, and the exhaust manifold and driveside of the turbo were glowing cherry-red right before the manifold cracked, the turbo seized, three exhaust valves and seats melted along with their piston crowns and everything quit working$$:eek:

If your vehicle is chipped (for increased fuel delivery, that's how extra power is made) TURNING DOWN BOOST has the opposite effect of RAISING EGT's by promoting overfueling due to lack of O2 for combustion. Raising boost (see warnings above) will lower EGT, as will water/methanol injection, and nitrous, also.

You can keep EGT's down by simply keeping your right foot out of it! Reducing unburned fuel reduces EGT's.

Engine coolant temp is an indirect indicator of EGT; HOWEVER, by the time you notice an appreciable increase in coolant temp you'll have toasted a head! A PRE-TURBO pyrometer is the only way to monitor EGT's accurately, and is a neccessity if you have performed any engine mods that increase fuel delivery.

Hope this helps.

Husker 6.5

[Husker 6.5]

I agree with Husker 6.5 100% But I would put the old chip back in till you had a EGT Gage or the 4" exhaust. Running the way you are is like playing Russian Roulette with 2 rounds in the gun. Your going to be pulling that hill and that Power Joke starts to pass you we can't have that so you push a little harder on the throttle I almost got him! Just a little more, you know the story!! personally I feel gages are the first thing that way you can see whats going on with all the other improvements.

Probably more like with four in the gun, or like the idiot who played Russian Roulette with one round in the clip of his semi-auto pistol:D :D

[6.5 MONEY PIT]

Thanks Husker 6.5 that was very helpful , I will either go and get at least the pyro gauge or pull the chip out until I can get the gauges, I dont mean to be a pain in the ass but how hard is it to instll egt gauge and what better pre turbo or post turbo a far as the two go?

[Husker 6.5]

Thanks Husker 6.5 that was very helpful , I will either go and get at least the pyro gauge or pull the chip out until I can get the gauges, I dont mean to be a pain in the ass but how hard is it to instll egt gauge and what better pre turbo or post turbo a far as the two go?
See my post. Pre-turbo is the ONLY way to go. Post-turbo, the exhaust has already cooled 150-250*F and you can not get an accurate idea of what the EGT is as it's leaving the exhaust ports, and that is the critical temp for valve, head, and piston survival!

Well, I've already drilled and tapped my exhaust manifold since it and the turbo are off due to my pulling both heads, so it was really easy to do. The spot I used was that little square pad cast onto the front of the manifold just below the turbo mount. It's like that's what it was cast for.

On, it's a bugger, and you always run the risk of metal shavings getting into the turbo. That said, the trick everyone uses mounted is to idle the engine while drilling and tapping to blow the chips out of the hole. Try this tip also: Take a powerful magnet and stroke the drill bits and tap that you are going to use lengthwise about thirty times, this will magnetize them and chips will cling to them that don't get blown out. Use three bits, 1/8, 1/4, and the final size recommended on the 1/8th pipe-thread tap. It will make drilling easier and more accurate. Shut the engine off after drilling to let the manifold cool down. Once cool, restart the engine and tap the hole. Use some light machine oil to lube the tap, once started, go 1/2 turn forward, 1/4 turn backwards while tapping to clear the tap flutes of chips (no broken tap), and only run the tap in half way to keep the pipe taper.

Congratulations, you can now screw in your probe.

PS: Make sure what size pipe thread the probe needs to be tapped to. Most use 1/8 pipethreads, but some use 1/4. Always best to get it right the first time.

Hope this helps.

[6.5 MONEY PIT]

thanks again Husker 6.5 very helpful . Ill keep you posted , this is all new to me the Diesel that is, I have so much money into this truck I was ready to give up until I found a few of these diesel sites I have replace both heads and gaskets injector pump , lift pump, fuel pump, rebuilt trans, 3" exhuaust, all new front stearing and suspention, shocks, tires I just put new brakes and roters/drums all the way around, both rear axle seals four wheel drive front accuatior and now the paint is chipping off the hood , roof ,and quater panels it never ends with this suburban, the funny thing is I thought I was getting a good deal on it when I bought it 4 years ago it only had 82.000 mi on it and I picked it up for 8500.00 bucks now it only has 126,000 on it . but I have invested more than that into already oh well enought of my crying , the good thing is it is finally starting to become a reliable vehicle thanks to guys like Walt and SS diesel , and the help from guy like you on the form thanks again Dan ,:D

[3bals]

Another trick taught to me by an oldtimer, is to fill the flutes of the tap with good old fashoned lard. It lubes the tap and collects the shavings too.

Jody

[Husker 6.5]

Another trick taught to me by an oldtimer, is to fill the flutes of the tap with good old fashoned lard. It lubes the tap and collects the shavings too.

Jody
Sounds yummy, hot lard and metal chips blowing out the exhaust manifold! Anybody for a Funnel Cake? You guys dug out yet up in the Twin Cities? It's 68* right now, and you can't even tell we had a nasty blizzard 10 days ago.

Husker 6.5

[3bals]

Sposed to be 58 tomorrow. Still lots of snow. I emailed you a week ago with no response. Must have got lost in cyber space.

Jody