boost over 30 psi???

[BRayls]

I have read here many times that we don't want it ,to much egt heat. so here is my resultsI ran mine with stock elbow and egt's were at 800 real quick,by 3rd gear. with the edge supplied,they are at 760 after a half mile of wot. now after a friend returned from haisley's with a blocked one,I also ran my old one ,and still am. egt's with the blocked elbow are at 670 at the half mile mark. boost is only 37. 5 max on the x-mon. buddys auto hits 40,isspro. both while keeping egts lower than before,and on recommendation from one of the best. so what gives????I might add they pull a little better in high now.

 

[XcumminsX]

half mile at WOT and you have 760 . I dont think thats right



Nick

 

[curatchko]

I think someone has a bad thermocouple.



Stock truck will hit 1250 WOT for 1/2 mile. Edge box on top of that will eclipse the 1300 barrier. Increasing the boost should drop the EGT's a couple hundredish... but there ain't nobody WOT at 760 degrees..... shoot these trucks cruise at 600 and up.

 

[mattymac]

are you pre or post turbo on your coupler? even cold for post mount.

 

[BRayls]

post,I am one of them guys that does not want to buy a turbo if I have a probe problem. the auto truck of my buddys hits 900. both of us are running the level 5 on the ez also. being that we both read about the same cruising,I thought the temp differance (egt's)between the trucks was ,trans. as I get out of the throttle for shifts and he does not. thus allowing him to get 900 easier than I. as for no trucks reading that cool,wrong I know of a few(all of them that I know) that are the same,here on the flat lands.

 

[Prairie Dog]

With the TST on level 5/5 and a stock elbow, my truck only kisses 1200 (pre of course) and then backs down a little as the revs climb. It wont go any higher than 30 psi boost.

Here's question about elbows. Why not just drill a small hole in the stock elbow (same size as aftermarket) instead of changing it out? Is this just not accurate enough?

 

[MCummings]

Originally posted by BRayls

post,I am one of them guys that does not want to buy a turbo if I have a probe problem.

Looks like you might be buying (or under warrenty) a whole new engine because of inaccurate EGT.



Just how far away is the probe from the turbo?



Merrick

 

[BRayls]

please some replys that are useful. after all I have checked my gauge and it is nice and accurate. if it were going to burn up it would have long ago,after all I have over 19,000 miles on it. it is not my first to mod either. prairie dog the stock elbow has a bigger hole than we want. you have to plug it and drill plug or just plug it,like we done on the older trucks. so far I only read posts saying I have a bad gauge or thermo,that is incorrect. well at work I installed the thermo and hooked up the gauge to a furnace with 3 other temp readers on it and the one I am using is ok. so please post on the topic. not something you cannot possibly tell is bad from in front of your computer.

 

[MCummings]

BR,



I wasn't saying your gauge is reading incorrectly. (I guess I did. . )



What I meant to say, is although your EGT gauge is dead on accurate,, the temp is probably alot higher where it needs to be monitered.



That being said,, I guess I have no grounds to seriously go on about having a motor replaced... I didn't hurt my motor untill I sustained EGT of 1800*. I would hit 1600 for a LONG time,, but no immediate damage untill I sustained 1800* for 1/2-1 mile with a 49' trailer.



Merrick

 

[Don-T]

BRayls

Is the temperature probe in the exhaust manifold (pre turbo) or is it in the exhaust pipe (post turbo)? If it is in the exhaust pipe the numbers you are getting sound reasonable but that means the exhaust temperature in the manifold is much higher, maybe 1200 degrees.

 

[MCummings]

Originally posted by BRayls

post

Merrick

 

[robertyoke]

Originally posted by MCummings

BR,





I didn't hurt my motor untill I sustained EGT of 1800*. I would hit 1600 for a LONG time,, but no immediate damage untill I sustained 1800* for 1/2-1 mile with a 49' trailer.



Merrick

:--)

 

[Matt400]

Originally posted by BRayls

please some replys that are useful.

Ok I will try but I am a Diesel newbie and my info comes from more study than hands on at this point so take it for what its worth...



With your post mounted probe, AFE and added boost the temps make since to me- why?

The probe may be seeing 300 deg less than actual plus you are pumping way more air which leans the mixture, lean mixture on a Diesel will reduce EGT's as I understand but not on a gas motor.



What setting is that Edge box on?



Ok old-timers educate me some more if I'm wrong cuz I am still sponging up all the info TDR has to offer

 

[Forrest Nearing]

the FAA allows EGT probes pre-turbo on airplanes... and they're crazy anal about what parts are allowed and what their lifecycles are...



you don't want to buy a turbo, but there's a good chance you'll be buying an engine if you're not careful... you can pick up a good HX35 on ebay for a couple hundred bucks... you'd be lucky to get a good engine for a couple thousand...



Forrest

 

[mattymac]

does anyone know the efficiency range on our stock turbos? the 600's use bigger compresser housings with an electronic w/g control valve, and all stock could get to 1200 deg. at 34-29 lbs of boost, (top end fluxuates). with edge ez lvl. 4 can hit 1250 deg. at a level 40 lbs. seems cool givin additional hp. but arent these little turbos out of their effeciency range at that much boost?

 

[timjones]

At 34-35 psi boost is about all the stock turbo is good for. Yes it can make more 42-43 psi, however what happens is that the charge air gets real hot and looses effect. the reason for the fancy filters and good intercoolers is to keep the temp down. hot air at high boost is not as useful as colder air at a lower pressure. The second problem is the exust side is very small so you end up with huge back pressures, which mean that your not scavaging the bad stuff out, giving you a contaminated charge left is the chamber then adding real hot charge in = bad.