I read that Turbine Doc seems to think its around 220 degrees. Anybody know for sure? I hit 216 (as measured by my odb2 software) at sustained 11 PSI.

I've heard that 220 is the magical number. You will know when you hit it because it's like hitting a brick wall...

Lyndon digs into the ECM's, he must know that info?

DTC78 equiv..................

What does an intercooler bring your temp down to? Mine is a smaller intercooler i dont know the measurements but i am wondering if it would help out on the IAT

any intercooler will help out on iats.

What does an intercooler bring your temp down to? Mine is a smaller intercooler i dont know the measurements but i am wondering if it would help out on the IAT

For those wondering what an IC is & why we do it read herehttp://www.bankspower.com/Tech_bigdensity.cfm properly sized IC will net about 30F delta between ambient and post turbo on a hot day (100F) on that kind of a day I run 130F IAT, in 50F nets about a 70F IAT on mine

Thanks for that DOC

I logged mine with the OBD2 program. Mine heated up to 246 degrees before it cut fuel. It did it over and over at the same point. It is an F code engine.

I logged mine with the OBD2 program. Mine heated up to 246 degrees before it cut fuel. It did it over and over at the same point. It is an F code engine.

what psi were ya at?

15.5 psi. It just cut the fuel for a second and away it went again for another few seconds and then it cut again for a second ...... I assume it would have done this all day if I would have held it down.

Before I get flamed I just did this to find out where it cuts fuel. I have it set at 12 psi most of the time.

I assume you had the boost fooler set to make sure it didnt see the extra 3.5 psi?

Nope - I have not bothered with a boost fooler yet. My reflash was supposed to take care of that but I really have not checked it close enough to know for sure. I have had the truck cut fuel with less boost, hotter ambient temperatures and a longer pull and it did the same thing. I am just assuming that it is the iat cutting my fuel. It has been cold and rainy here for a few days so I have been waiting for better conditions to try another test with a bunch of the extra data removed from the log. Hopefully that will give me the real answer. It seems that if the boost level/voltage has argued with either of the computers it trips a boost voltage code and throws the truck into a limp home mode until the next restart. I have tried the iat with both computers and they both tripped fuel just after 240 degrees.

cool. sounds good.

I towed this weekend with my scanner hooked up and the highest I got was 304 degrees IAT and my fuel rate was 74mm3. Highest fuel rate I saw was 78mm3. At stock boost without the boost fooler was 11PSI and 278 degrees IAT. With the boost fooler and 15PSI was when I got the 304. Want Heath to hurry up and get the water to air intercooler done.

Ok guys , Im new to diesels and Im sure its been explained before but could someone explain " defueling " to me ? Ive read the above posts and comments like " hitting the wall " sound familiar to me .
For example : I made a machanical wastegate controller because something was wrong with the vaccum setup . Anyway I had it dialed in to hold 8psi sustaned running it at 2800rpm . I and was concerned that when I loaded the camper on that the boost would go through the roof on grade , BUT ! it would hold at 10psi , loaded , on grade . Now I know Banks said 10psi is max safe so thats what I would hold at with the gage , but it didnt matter because if I tried to put my foot down any futher it would " hit the wall " ! There was no benifit from trying to accellerate any harder because there wasnt anything left .
Is this what you guys are talking about , and if it is , what causes it ?
Thanks
Jim

defueling or "hittin the wall" is caused when iats get to hot. the computer reads this over heating and cuts fuel which in turn cuts boost. when youre going down the road gettin on it and this happens it feels like youve a brick wall cause you suddenly loose power. sometimes it throws codes and you have to pull over and restart the vehicle.

Thanks . Youve just explained to me whats happening to my truck ! Now that I have the machanical wastegate controller . I get the SES light after a spike in boost, like if it downshifts an bumps up over 10 psi . I stop , shut it of at the fueling station then on restart it goes away . I was just reading about wastegates and " Boost Foolers " . Now for my next question because I havent found the answer to that yet as Im reading . Whats a boost fooler , and is that what I need to stop the SES light from commig on ?
Thanks
Jim

a boost fooler mounts on one of the three wires coming off the boost sensor. this allows you to run more than stock boost with out throwin a code. this, as far as i know, will not solve a iat defuel. my question is, when your ses light comes on does your truck suddenly slow down. if your light comes on and nothin else happens you might just be throwin a over boost code and a boost fooler would fix this. just my opinion but 10 psi seems a little low for iats to cause defuel. my blazer never defueled until about 17 or 18psi without chip. after my chip it never defueled even at 21 psi.

I kinda figured thats why the SES light comes on because it didnt come on before I put the machanical controller on .. I need to find out where to get a boost fooler . My "Hittin the wall " I probably more due to the fact that the load is quite a bit at over 4000lbs .

well if youre not getting the defueling then your not really hurtin anything. youre not "hittin the wall" if you engine isnt defuelin. its just saying to much boost but 10 psi aint to much. i recentally pulled about 8000 pounds up through the mountains at 60 to 70 and never had mine defuel.

i had some defueling happen this weekend pulling my camper 6000# in the white mountains i was trying out the autozone cone filter half way up the grades it started losing power put the pedle to the floor and nothing like i never stepped on it , probley not a smart thing to try with out gauges , temp never went over 210 with water wetter. i had a 3" pcv connector on the cone it melted a little so for the return trip i put the stock box back on not as much power and alot of black smoke pulling the grades but no defueling same temp 210 going up 180 on the flats . temp out those days about 85

Thanks I think Im understanding this now , just learning some of the terminoligy of it all . Im also finding out that I need to do something about tourque converter lock up on grade . That 4000lbs is not a pull behind thats the weight dropped in the bed from an Artic Fox truck camper , then add all the gear and the family and she gets real heavy! So where do I find a boost fooler ?

Buy one from Kennedy is easiest, or build one is cheapest search for boost fooling for schematics

Thinks thats what Ill do . Im very close to a chip and intercooling . Kinda got the bug after all the little mods , well the cooling upgrade might not be concidered little but a must after running too hot for my comfort last year !

Just wondering if the airbox ChevyDave built lowered his IAT's . Thats a nice build and i am considering aswell

Was that the guy that put the little scoop on his fender?

Correct