Looking for ways to reduce EGT

[RSchwarzli]

So other than turbo, what things can I do to reduce my egt's?



I gather changing my timing to 16-16. 5 or so us a good start. Is there anything else? What else can I do to make the motor more efficient without spending much?



Thanks!



Robert

 

[Midnite]

An easy and cheap thing to do is to do something about the crappy stock muffler. On my '92 I replaced it with a simple straight thru type muffler, and on my 2000 I replaced it with the muffler eliminator pipe from Geno's. You don't gain a whole lot from doing that, but you do gain some, especially if you've already done some fuelling mods.

Mike

 

[RSchwarzli]

I agree! Currently strait piped!

 

[NIsaacs]

What are your EGT's? What or when are they too high? What temp do you consider too high? I have found the 1st gen likes low rpm for pulling hard. About 28 psi max boost and 1700/2100 rpm. I assume this is due to cam timing/profile, pump timing and the non-wastegated turbo. If high rpm is your goal the HX35 you mentioned will help some. What axle gears do you have?



My preference is gear fast run slow (rpm). High rpm is fun for dyno's, truck pulls and drag racing, anything for short periods. However the 1st gen will thank you to stay in the trq. band for pulling hard for long periods of time and stay out of the HP band. High rpm creates heat everywhere, uses more fuel and stresses all moving parts.



Nick

 

[RSchwarzli]

Nick,

you and I are on the same page. While towing in the tq band foot 90% to the floor I saw 1250 after 10 sec. Granted I started at 50 mph / 1600 rpm and held it while going up a steep grade as I wanted to see how toasty it got. My guess is if I did start a hill at a more moderate speed I may have less issue. But mt mind is still in the fact that when I hit the Rockies and high altitude, hill speed will be an issue after a minute or so anyways.

Gearing is 3. 07s with a stock getrag and I do have a gear vendors going in to help with gearing choices.

I would prefer to keep rpm under 2100. I am not a fan of revving diesels. They have the tq may as well use it. I may need 2500 rpm for fan cooling but as far as egt goes.....

Does that give enough back ground info?

 

[NIsaacs]

Dang! 3. 07 axle with the 5spd is rare. All the early trucks with the 3spd auto used that ratio. That should give you an awesome pulling gear, 4th. and a go home gear 5th. I still think with your power levels you will be fine. My 91 dyno's very close to yours, 263/708 at 28 psi. factory turbo w/16 and factory 3" exhaust no muffler. However if you have the factory 1990 radiator, that is smaller then the 91. 5 cross flow. Still, again talking fall weather where you live, is probably on the cool side. Also, most Rocky Mountain roads are speed limited so that will help too.



I have done a lot of hauling over the mountains in Colorado and did not see much difference in the elevation causing high temps. You said you wanna keep it cheep so just drive it as is, you will be impressed at how well that little turbo does. And yes, thank you for the truck info, you did good



Just as an FYI, my 91 at 310,000 has the original clutch, the 01 with 170,000 has the original clutch, however the Ford has used up several 12" Chevys, several 5th gears, one 3rd gear and one overdrive gear in the AUX. transmission. In all fairness it was built and used for hauling logging equipment, heavy, steep and soft roads.



Nick

 

[RSchwarzli]

That's great. Thanks!

well my truck was an auto. I coverted it to a getrag about a year ago as I had most of the parts leftover from the crewcab project!

4th is great. 2500 is the top of it and I am doing dead on 80. Perfect for towing!

Thanks again for the info. Much appreciated!

 

[cerberusiam]

Well, what would help is regearing to the correct gears for the trans. I can see where you may run into some problems with those gears, a heavy load, and elevation.



The 3. 07 was only with an auto and severely reduced towing weights for a reason. The engine flat does not like to run at the leverage they end up at under load. They will but you see the results with the EGT's.



Biggest\best change you could make if you want to tow is back to 3. 55's or even 4. 10's and a taller tire. Much better mechanical advantage and lot easier to control the EGT's under varying conditions.

 

[NIsaacs]

cerb, I am going to dis-agree a little. You always have good info, so it is only going to be a little



As a tow vehicle, the early Dodge Diesel, 3. 07 gears and an auto was marginal at best. For start ability the 3. 07 was too high and too low for cruising (even empty) especially out here in the west with wide open freeways and 100 miles to anywhere. So I agree.



However, 3. 07 gears with a standard is very useable. 10,000 lbs is not heavy for this truck. All the 1/2 tons will pull this. If this truck were to be used as a commercial hauler I would say yes, go to a 3. 50 gear. 4. 10's with the little Getrag's short overdrive restricts your cruise speed and allows you to pull almost any hill in 5th. Not good, the 3. 50 or higher will force a down shift, good!



1st gear and 3. 07's will launch 10,000 lbs no problem. Once the truck is rolling, the gear choices make any rear axle ratio equal. He will be mostly forced out of 5th loaded so now the truck is kinda a 4spd. However as a daily driver this combo is great. I see in Robert's sig. he has two other trucks he can use for most of his towing needs. I think he is just playing with the 90 Nuf' ramblin I guess



Nick

 

[RSchwarzli]

Well, what would help is regearing to the correct gears for the trans. I can see where you may run into some problems with those gears, a heavy load, and elevation.



The 3. 07 was only with an auto and severely reduced towing weights for a reason. The engine flat does not like to run at the leverage they end up at under load. They will but you see the results with the EGT's.



Biggest\best change you could make if you want to tow is back to 3. 55's or even 4. 10's and a taller tire. Much better mechanical advantage and lot easier to control the EGT's under varying conditions.

Agreed. I did look into that. In the end, I got a gear vendors unit to assist with that. Best of all worlds. I do have two 3. 54 axles in the garage left over from the crew if that does not work, but I suspect with the splitting ability, it should work out better plus with the higher cruise ability.

 

[RSchwarzli]

cerb, I am going to dis-agree a little. You always have good info, so it is only going to be a little



As a tow vehicle, the early Dodge Diesel, 3. 07 gears and an auto was marginal at best. For start ability the 3. 07 was too high and too low for cruising (even empty) especially out here in the west with wide open freeways and 100 miles to anywhere. So I agree.



However, 3. 07 gears with a standard is very useable. 10,000 lbs is not heavy for this truck. All the 1/2 tons will pull this. If this truck were to be used as a commercial hauler I would say yes, go to a 3. 50 gear. 4. 10's with the little Getrag's short overdrive restricts your cruise speed and allows you to pull almost any hill in 5th. Not good, the 3. 50 or higher will force a down shift, good!



1st gear and 3. 07's will launch 10,000 lbs no problem. Once the truck is rolling, the gear choices make any rear axle ratio equal. He will be mostly forced out of 5th loaded so now the truck is kinda a 4spd. However as a daily driver this combo is great. I see in Robert's sig. he has two other trucks he can use for most of his towing needs. I think he is just playing with the 90 Nuf' ramblin I guess



Nick

Agreed again. The 1990 was originally a 727. It sucked! Lol it really did. Don't get me wrong, it never let me down, but I also could not really do the speed limit on the top end either.



as I am not an auto fan, and as I had the getrag parts left over from the crewcab, well, it was a long winter while the project was being re painted!



Yes, playing a little is true. But as there are two trailers dad needs moved, and one will be behind the mega, well that means the 90 needs to get it's act together! :-laf



Thanks again guys!

 

[cerberusiam]

cerb, I am going to dis-agree a little. You always have good info, so it is only going to be a little

Oh, disagree all you want. Thats what discussions are all about.



I agree completely with what your saying Nick, it will pull it and it makes a great DD with light towing on the flats. However, at 5k or less load not 10k and no way is a good idea on a long term basis at elevation and grades.



Do it once to see what its like and watch all the paramters to see whats happening, then, regear and do the same thing again. When you run a comparison I am pretty sure you will see what I mean.



The mechanical leverage is what I am talking about and once you go over 6-7k it really starts making a difference in how you can drive to keep temps in check. Not only EGT's, engine temps and especially trans temps sky rocket when that mechanical advantage gets too far out. Need I mention just how susceptible a G360 is to heat and its life expectancy?





I know he is playing with it and he has other toys so just throwing the normal things out there to keep the perspective. I would not feel right if I let him take off into the mountains without having some input that could impact the trip, good or bad.

 

[RSchwarzli]

And I appreciate that more than you know cerb!

 

[cerberusiam]

Yes, playing a little is true. But as there are two trailers dad needs moved, and one will be behind the mega, well that means the 90 needs to get it's act together!

If it was me and had the time, I would put the HX35 on it and swap the axles to the 3. 55's and drive it. Monitor boost, EGT's, even maybe trans temps, and see how it drives and what happens.



You can always throw the 3. 07's back in there later and run the same tests in not so critical of a scenario. Thats my thing, I like to play also.

 

[fox]

Why not just change the exhaust housing to a smaller one? That will move more air. But, you may want to find a wastegated one.

Like a 16 with the wastegate. butter spool up and cooler too.