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Boost Question

1K views 12 replies 7 participants last post by  Mikes7.3 
#1 ·
Lets see if someone can shine some light on this for me.

2000 f350 7.3 PSD (mods in sig) 188K on the clock. I made a diy boost fooler with a simple pressure reg that internally bleeds downstream. It does work havn't seen a SES light since. Unplugged my waste gate, and even with the 6.0 IC I cannot get over 25 psi of boost. Have checked for leaks. I'm thinking maybe the turbo is giving out. Starting to surge alot when towing but only in OD. :dunno:

Let me hear some opinions....

Thanks,
 
#2 ·
25 doesnt sound bad... Might check your boost with a AE program... Might be a boost gauge issue or the line too.
 
#3 ·
25 is decent for a chipped SD with the stock turbo
 
#5 ·
Some trucks do some dont... I could not get over 25-27 and still put down 326 hp before the turbo and injectors... With a DI chip. Now with injectors and such I see 38psi...

Got to remember that boost doesnt equal more power, just more heat. If your not smoking, EGT's are good, and the power is there I would bet your doing fine... I also changed the Boost gauge from a Autocrap to a Isspro and picked up about 3PSI...
 
#10 ·
Actually.... more boost generally means more restriction. Whether or not it means more heat depends a lot on where in the turbo's map range you are.

John... I would expect the 6.0 IC to actually lower you boost, not raise it. That doesn not mean that performance will not increase. The IC swap gives you less restriction accross the cooler (which means less boost) and also cools the charge air better (which again potentially means less boost). The cooler air is denser, and shows a lower pressure, but most likely delivers just as much (if not more) oxygen as the warmer charge air at a higher pressure.
 
#6 ·
Ive never seen over 26 psi out of mine and that was on the pedal real hard to pass a big rig
 
#8 ·
I have one at each location... both read about the same, with in a # or so...
 
#9 ·
My egt's are ok. When I unplugged the wastegate i went from 23 psi to 25-26 and dropped the egt's at wot a little. Now I still hit 1300+ but not as fast.

Yes my fooler is in the map line with my boost gauge. And yes the tap for the gauge is before the regulator :D
 
#11 ·
It makes sence Aaron, but it didn't work that way. I didnt expect any gains in boost when I changed ic's but it went from 20psi to 22-23. It's not that i'm trying to hit 30+ pounds I just thought it should be capable according to what i've seen/heard (or think i've seen/heard :D I starting to think i dreamt it :D)
 
#13 ·
John I don't think you have a problem with your turbo 25 is good but if you want to see 30 psi boost and eliminate your surge put an ATS Housing on and leave your stock wheel on. The intake side of the ATS housing is 4" compared to 3"-3.5". Your turbo acts like a compressor it forces air into your cylinders. The more air you force into your cylinders the more fuel you can burn and burn efficently. You have the 6.0 i/c that helps to cool the air and allows you to cool more air (cool air is denser than warm air has more molecules i.e more oxygen) and will help you even more if you get a larger charger, but you haven't increased your air supply past stock. You get more air in your cylinders =
hotter explosion turns your turbine faster which in turn turns your compressor wheel faster which forces more in and on and on. Here is a site for a basic explanation on turbos.
Howstuffworks "Turbochargers: Lots More Information"
I have hit 32 psi boost and could have gone a little higher I think but I backed out of it. Air is the key element in making our trucks run, the cooler the air the better.:D
I like the way my truck runs and tows now but, if I was going to do any more mods I would get a bigger turbo first and have my chip re-flashed for the 140 aggresive by Jody.:cool:
 
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