View Poll Results: What's your MAX boost?
< 25 psi
27
14.44%
25-27 psi
50
26.74%
28-30 psi
73
39.04%
31-35 psi
29
15.51%
> 35 psi
8
4.28%
Voters: 187. You may not vote on this poll
What's your MAX boost?
Post Fiend
Joined: Oct 2005
Posts: 10,626
Likes: 7
From: Plano TX and Brentwood TN
Are you running the stock airbox or aftermarket one? Aftermarket one might make the computer think that your running more boost then you really are if it is allowing more air in(I'm not too sure about that, but that is just what I would think).
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Posting Guru
Joined: Mar 2006
Posts: 1,798
Likes: 2
From: SoCal, SD CO. East
Originally Posted by tex25025
Are you running the stock airbox or aftermarket one? Aftermarket one might make the computer think that your running more boost then you really are if it is allowing more air in(I'm not too sure about that, but that is just what I would think).
Post Fiend
Joined: Oct 2005
Posts: 10,626
Likes: 7
From: Plano TX and Brentwood TN
Originally Posted by ozx3+1
It's a stock air box, but I think that I also need to check it! If the turbo side housing is wrapped and not sealing correctly (a known issue to Ford) I may be drawing uncleaned air from there. In any event, the MAF reads the volume of air that rushes into the system. Clean or dirty, stock or AM, the MAF has the ultimate read. Maybe that's something to gently clean as well...
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Posting Guru
Joined: Mar 2006
Posts: 1,798
Likes: 2
From: SoCal, SD CO. East
Originally Posted by tex25025
I just don't know, 33 just seems high to me for a gen. econo tune, especially when I only see 29 with my hybrid race. Could your turbo be stuck in a position that would cause high boost numbers with such a mild tune? Sorry for the spitballing here, just trying to come up with something.
Senior User
Joined: Aug 2007
Posts: 469
Likes: 1
From: lake park, MN
don't worry about it oz, I notised on my truck if I was running the datalogger on the xcal 3 the boost was showing about 3-5 psi off from what my Issapro boost gauge showed coming from the elbow. with the hybrid race tune from matt if im hard on it I can get it to come up to 34-35 for a short period. From what I understand from someone most of us know its nothing to worry about. He has the cylinder pressure so low cause of timing that the boost can be higher and there still is not alot cyl pressure compared to regular timing. Its safe man!
Post Fiend
Joined: Oct 2005
Posts: 10,626
Likes: 7
From: Plano TX and Brentwood TN
Originally Posted by denman81
if im hard on it I can get it to come up to 34-35 for a short period.
Senior User
Joined: Aug 2007
Posts: 469
Likes: 1
From: lake park, MN
I get that too, but with that hybrid there always seems to be a little more to give ya a nice big smile on yer face when you do get her to the floor.
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Posting Guru
Joined: Mar 2006
Posts: 1,798
Likes: 2
From: SoCal, SD CO. East
This may be a little long
Originally Posted by denman81
don't worry about it oz, I notised on my truck if I was running the datalogger on the xcal 3 the boost was showing about 3-5 psi off from what my Issapro boost gauge showed coming from the elbow. with the hybrid race tune from matt if im hard on it I can get it to come up to 34-35 for a short period. From what I understand from someone most of us know its nothing to worry about. He has the cylinder pressure so low cause of timing that the boost can be higher and there still is not alot cyl pressure compared to regular timing. Its safe man!
- The timing is set to fire the injectors when the piston is at (near?) TDC, therefore there is less time for prolonged heat activity to occur within the cylinder walls
- Because the heat activity is NOT prolonged in the cylinder (heating the piston, cylinder walls, engine oil, etc) it exits as hotter exhaust gas
- Keeping in mind that heat activity withing the cylinder raises the cylinder pressure and has the potential of lifting heads, etc, this technique is a good thing... The timing strategy of the Hybrid Race is easier on the top end of the motor as a result
- This timing method transfers the kinetic energy to the bottom end of the motor (exploding gases forcing the pistons & rods down) into the significantly stronger area of the 6.0 power plant
- Because the exhaust gases are significantly hotter, and the fact that heat expands there is more exhaust pressure
- Exhaust pressure (or volume) is the power that spins the impeller on the turbo inlet side (that in kind, spins the output side forcing more air through the intake)
- Hotter exhaust=more volume=faster impeller spin=MORE BOOST!
Last edited by OZX1; Feb 12, 2008 at 02:48 PM.
Postmaster
Joined: Apr 2006
Posts: 3,294
Likes: 1
From: Neptune Beach, FL
Originally Posted by ozx3+1
Well I learn something new every day. After talking with Matt (always a pleasure) I have a very good understanding of why the Hybrid Race tune has my truck (maybe your truck too) running the great way that it does.
....
....
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Posting Guru
Joined: Mar 2006
Posts: 1,798
Likes: 2
From: SoCal, SD CO. East
Originally Posted by Storm
That is good info.. My concern is the lifespan of the Turbo operating at boost pressures it's not use to.. Or overspinning of the turbine..
It seems that the material used in the turbo's manufacture are some whizzbang stuff that can withstand a helluva lot more heat than the pistons can... "The turbo may not live 500,000 miles" but pistons melt fast.
Postmaster
Joined: Apr 2006
Posts: 3,294
Likes: 1
From: Neptune Beach, FL
Originally Posted by ozx3+1
Matt did speak to this. In his direct experience; if your boosting 44psi for a long pull up a hill it'll shear the shaft and send the impeller into the muffler (or words to that effect...) Boosting 35psi in peak events is not a bad thing.
It seems that the material used in the turbo's manufacture are some whizzbang stuff that can withstand a helluva lot more heat than the pistons can... "The turbo may not live 500,000 miles" but pistons melt fast.
It seems that the material used in the turbo's manufacture are some whizzbang stuff that can withstand a helluva lot more heat than the pistons can... "The turbo may not live 500,000 miles" but pistons melt fast.
Glad you got your mind at ease Oz.. Told you it be ok.. Now just walk around and call yourself Nova.. Casanova..
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Posting Guru
Joined: Mar 2006
Posts: 1,798
Likes: 2
From: SoCal, SD CO. East
Originally Posted by Storm
I figured that much.. Lemme go test it LMAO
Glad you got your mind at ease Oz.. Told you it be ok..
Glad you got your mind at ease Oz.. Told you it be ok..
Originally Posted by Storm
Now just walk around and call yourself Nova.. Casanova..
Postmaster
Joined: Apr 2006
Posts: 3,294
Likes: 1
From: Neptune Beach, FL
Originally Posted by ozx3+1
Yeah, but I have to get all analytical and stuff...
Originally Posted by ozx3+1
Casanova? That's my wife's pet name for me! Y'all been talkin?