Engine/Transmission (1998.5 - 2002) 14cm housing = >>>>>EGT's Help

[Whitmore]

Here's the deal, I just put on a 14cm housing and now I can easily hit 1500* pre turbo before I hit 90 mph with an empty truck, this is with my comp on 5x5 and I have 275's as well, the 14 cm housing is the only mod I have made in a while. With my stock turbo and pulling my 27' 5er up a 7% grade and the comp on 5x5 I could only reach 1350 and it wouldnt climb any higher.

What's the deal and how do I correct it, I cannot pull my 5er with this combo, on the same grade I could hit 1300* with my comp off and no 5er





Lost in Wyoming, Kevin

 

[LSMITH]

If the 14 housing is not wastegated that would explain it. What happened to your peak boost with the 14? What is your peak boost?

 

[Whitmore]

It is wastgated and to tell you the truth the egt's were so high that I forgot to look closely yo the boost gauge but I think it was in the area of 34 psi, Piers said he would preset it to open at 34



:{ Kevin :{

 

[Whitmore]

How bout it fellas, I dont want to go back to my 12cm housing



cheers, Kevin

 

[LSMITH]

Dang hoss, they should have dropped 100-150 with a 14 wastegated housing. What was your peak boost with the 12 housing?

 

[Whitmore]

Thats what Piers said too... ... ... ... . 150* drop thats why I got it, my peak boost with the 12 cm housing was 38 psi.



cheers, Kevin

 

[LSMITH]

Dang Kevin, makes no sense at all. I am out of ideas too.

 

[Whitmore]

Piers told me that the hx40 was not good with the HO as far as egt's go unless you are in the high high hp range, he basically said that the 14 cm housing was the best I could get for my setup, he thinks that the HO and the higher compression has something to do with it



Lost in Wyoming, Kevin

 

[Cummins4Life]

Whitmore, get ahold of member "muddymess" he had a similar problem with his HO I bet he could help.

 

[MUDDY]

kevin,



same prob i had. loose wire comp and dd2s my egt was higher than i liked at 7 to 9k foot elev and warm day on my 02 eth towing the tt. since i had the pac-brake i took al's recomend to swap stock turbo to a pdr35/16 [nonwastegated] hoping for a 150 degree reduction. well lemme tell ya that after nathan swapped turbos for me i hit the mnt and had to litterally pay more attention to pyro than road. that needle jumped to 1450 before i ould let up. shot up fast. hills that i would normally climb 75 w/ tt i had to downshift and do 55 with my pyro runnin 1350 with a light pedal. i wuz . i couldnt use the truck. i expected a good reduction but instead recieved a big increase. a small short grade would be enuff to jump that needle up. no idea how hot it wouldve climbed. i nearly got into a wreck as i had to pay more attention to pyro than road. boost with comp on 1x5 and the dd2s was 32 psi. 28 or 29 w/ box off if i remember rite



well, i called piers and he did me right. got a pdr 40/16 and i sold the pac and got a bd remote from piers. got that 40 on there and tried the mnt . i wuz a happy boy. cruzin temps w/ tt were higher than i like at nearly 1,000. a slight hill wld be 1100. a bigger hill it wld go reeeeeeaaaaaaalllllyy slow tween 11 and 1200 and even slower tween 12 and 1300. awesome. the higher cruzin towin temps of 1,000 dont hurt nuthin. hill climb temps were then reasonable. my eth was a good pullin rig then. appeared that power was up. dynoed 381/800 on 12/14. loosewire comp on 1x5 and dd2s with that 40. you NEED the pdr 40 on that eth. it worked for me kevin.



now it is strange the 14 is makin you so hot. many have good results w/ it. im glad i didnt swap the 16 for the 14. glad i went to the 40. piers said it was a mistake for al to sell me the 16 for my eth. works good on the 12v s.



i too cldnt hit 90 empty with the 35/16 w/o gettin pyro too high. since adding the 40 i could play all day at triple digit speeds and still have pyro reasonable. also turbo lag was not a prob. piers mods do work



now a ?. would lag be too great with the 275s [comp off]. if so its time to step up to dd2s if ya get the 40. also ya need the 40 to help ya burn the xtra fuel the comp gives in 5x5.

 

[BILLUA]

It is possible that your problem lies in the 5x5 setting on yr comp. The larger housing does not spool as quick off the bottom and you are still adding a ton of fuel with low boost settings. . I just upgraded to a 40x16 and put my box on smoke 3x2 and the egt's under dead stop acelleration were much lower... Having less fuue come in untill the turbo gets a chance to spool will settle your EGT"S down... For towing, try your box on 3x2 or 3x1 and compare your EGT's to see waht gives you the best compromise... i believe that 5x5 is just way to much fuel at low boost ...



Please post the results of waht you find out...



Cheers, Bill

 

[Roger rodbolt]

Whitmore,

First thing is that your Jacobs brake has a tiny passage in the elbow or outlet plus it has the shaft/valve further restricting air flow. The small e-brake is stealing the benefit from your 14cm housing.



Next, I've found that small injectors and high settings on the comp box = high egts, period. You can make the same horsepower with larger injectors and a much lower Edge Comp setting. This will yield lower egts because the fuel gets injected early via the large injectors instead of late due the the Comp box making the VP44 inject the fuel LATE.



Last, get a exhaust/turbo blanket from Geno's Garage and build a heat shield for you BHAF (if you don't have one).



I have another idea to try first if you want to PM me, hate to post it because it may seem like product bashing to some.

Larry

 

[LSMITH]

Originally posted by Roger rodbolt

Next, I've found that small injectors and high settings on the comp box = high egts, period. You can make the same horsepower with larger injectors and a much lower Edge Comp setting. This will yield lower egts because the fuel gets injected early via the large injectors instead of late due the the Comp box making the VP44 inject the fuel LATE.

Words of wisdom right there^^^^, applies to ALL 24V trucks and not just ETH's too.

 

[GeneralMachine]

Just Wandering

Ive been thinking on this problem and have wondered if we put on the bigger turbo more volume, im thinking that the engine could get to lean and there's the high ex temp. Harv

 

[Whitmore]

I am still puzzled

Even with the comp off and an empty truck on a 6-7% grade if I go wot I can still hit 1300-1350* before it stabilizes out, I am happy with my power level and think I may just go back to my 12 cm housing and sell the 14. With the 12cm and my 5er on at a 7% grade I could only hit 1300 tops and this was on 5x5, not that I run it on 5x5 towing but I just had to see what it would do. I find it interesting about the comment on injectors vs. boxes and am considering the rid of the comp and maybe just go to bigger injectors??? Will have to think alot on that one.



Also I still have a blown computer so this will be my last post for about a weak. I will let all you know what happens here.



cheers, Kevin

 

[Whitmore]

OK guys, heres what I did, I put the 12cm housing back on and my egt's are back down and are no longer a problem, now I have to figger out why the the 14cm was doing what it was doing



cheers, Kevin