Hey All,

First time post, been floating around for awhile now. My upgrades are as follows, gauge set, ford AIS air box, magnaflow exhaust, 3 1/2 down pipe, 4" rest of the way out. I got the gauge cluster about 3 months ago with the addition of the air box. My pyro gauge is mounted about 3 inches from the top of down pipe, I know everyone has been saying to go pre turbo, but ford dealer that installed setup said they always mount it this way. Anyway, while crusing at 70, my gauge reads about 500, boost a little over 5 on a flat grade. Going up a small grade might bounce it up to 600 on the pyro.
After the addition of the exhaust I was expecting the temp to go down but am finding no real difference at crusing speed, still between 500-600, although I do notice a slight drop in the boost at speed, like it's not having to work as hard?? I have done these mods due to the fact I pull a 5er, dry weight of about 9300lbs. This truck was new to me about six months ago, have not hooked camper up yet, so not sure how it will pull. Should have hooked it up before mods to get readings but it's in storage, Ia winters and all. So my question is this, am I expecting to much?? Is this normal?? I am pleased with the way it runs, better responce since the exhaust upgrade, turbo seems to spool quicker, not nearly the lag I had before, that's a plus. Some insight would be great. I have no intention of putting a chip in, truck is used as daily driver and to pull the camper. I'm hoping to see a little increase in gas milage, still on first tank and it seems that I'll get a few more miles out of her, so that is a plus also. These mods were done to a 02 SD Crew 4x4, 7.3 PSD.

Thanks again for all the help, just love reading the post here on this site.

Mike

 

I don't really have any experience with a post-turbo mounted pyrometer - but with a pre-turbo I didn't see a lot of difference in EGT's when I got my new exhaust. Maybe a 100* difference or so but I only had my exhaust on for a week before I got a tuner so I can't say a whole lot. In general I think maybe cruising speed temps might not change as much as if you are pulling up a hard hill?? With an intake and an exhaust without a chip you have to be running a little cooler - I'm wondering if maybe it has something to do with the post-turbo probe placement. That's my only guess. Maybe someone else with post turbo experience will join in here.......

 

get a mild chip, its the best way to get power and you shouldnt run too hot. I have my pyro mounted post turbo. I see anywhere between 500 and 600 crusin down the road. Maybe 800 if im pulling my trailer. The hottest ive seen was 900 or so pullin a 8000# boat up a long grade in 4th gear, on it. That to me, is my limit on temps. I usually back off around 800 though.

 

When you're cruising down the road at 70, you're not putting much of a load on the engine. You likely won't see much difference in temps or boost at those speeds. It's when there's a load on the engine that the intake, downpipe. and exhaust are going to prove their worth. Once you hit a long hill with your 5th wheel on the back, you'll see lower temps and higher boost than you would have stock. It's not too late to get your probe moved over to the pre-turbo position. It will tell you a lot more there. Pre-turbo, it will warn you before you get into the danger zone. Post-turbo, since it reacts so slowly in comparison to pre-turbo, will not get you the important information in time for you to react, or, if you're very cautious, you'll back out of the throttle before you really have to.
Just my $.02.

 

Exactly right.

Also, at cruise the pre and post turbo pyro's will read about the same thing, but the difference between them grows quickly as the load increases. With five tons in tow it will be worth you while to switch it to pre turbo.

 

Thanks for the input guys, will have to wait and see my readings with the camper hooked up.

Mike

 

I had my pyro mounted post turbo by someone else also. The highest reading I was getting was 900, after changing to pre-turbo I can shoot well over 1250. Over 1250 your definately hurting the turbo, I would recommend moving it to pre-turbo so you can have true readings. I have seen where alot of people claim a 300 degree difference and that might be true at the lower end but the higher the EGT's get, the more the spread is. Something else about pre-turbo is how quickly the readings change, both hot and cool down. If you aren't running a chip the EGT's should be ok but if you add any power they will go up. JMO