Wastegate or bov - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

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post #1 of 11 Old 04-13-2014, 04:36 AM Thread Starter
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Wastegate or bov

Alright guys question time. I threw a set of industrial injection phat shafts on my 6.4 cause the shaft broke on the low pressure turbo. I have been told and heard rumors about the big turbos creating to much pressure in the system if you suddenly close the throttle. I have a bov here at home and now see that make wastegate kits that can be fabricated on. My question is what do you guys think as far as which would be better.

Mike

'09 F-250 Lariat Crewcab Longbed
6.4 PSD
Spartan tuned
DPF deleted
Industrial Injection twins

EGR to be deleted once I get the blowoff valve installed and lots of other upgrades to come.

Sold:

97 Ford F250 HD Supercab XLT Longbed
AFE Stage 2 Intake
3" dp
Bully Dog exhaust
Hypertech programmer-getting 6 pos chip soon
Hankook all-terrains on Mickey Thompson classic II
Autometer: Pyro, Trans, Boost guages in A-pillar
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post #2 of 11 Old 04-13-2014, 06:11 AM
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It's kinda apples and oranges. If you are worried about chopping the throttle and pressure spiking you need a BOV. If it's sustained pressures you are worried about a wastegate is suppose to limit max driveline pressure to whatever you have it dialed in at.


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post #3 of 11 Old 04-13-2014, 06:38 AM
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Before you just take "somebody's" word on what your truck is doing for pressures, why don't you monitor your backpressure and see what it is and what the max is at any time during WOT? I doubt you are having backpressure issues.

And CountryAggie is correct, the two are completely different and do not overlap in any area. Wastegate is on your drive pressure side and a BOV is on your intake side. A BOV simply opens when you let off the accelerator suddenly and lets the built up "boost" that is in the intake out so that it doesn't try to force backwards through your turbo veins and stress your turbos.

2010 CC/SB FX4 Lariat.. Tuned By Eric@IDP and Matt@Gearhead

Thinking about getting rid of the stock 6.7 turbo?
Check this out... and research before buying



http://www.powerstroke.org/forum/6-7...ustration.html

http://www.powerstroke.org/forum/6-7...round-2-a.html
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post #4 of 11 Old 04-13-2014, 01:11 PM Thread Starter
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Alright. Yea I'm worried about the pressure spiking when I close the throttle quickly. I've heard it stresses the turbos and could possibly lift the heads and that I'd like to avoid. Thanks guys for the help. My old 7.3 was much easier.
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post #5 of 11 Old 04-13-2014, 02:51 PM
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Since a diesel engine has no throttle body (or way to limit air intake) I don't think a BOV is of use. I don't think you can make too much boost with stock turbos... that's not to say running around with the right foot down on a 300 tune is all kittens and rainbows, but
the engine is going to ingest the compressed air when you lift without issue.
Run 70psi on stock head bolts, yeah, I bet the heads might lift
typically its the high drive pressure that isn't any good, particularly with nitrous - this is thought to push the exhaust valves open (overcoming the valve springs) and possibly contact the piston. Installing a wastegate will limit your drive pressure, but as Woodboy said, why not monitor drive pressure and see what you have before you go down the waste gate road. Plenty of high hp trucks running around without a wastegate
Just my thoughts!

08 F350 CCSB 4x4 01/07 Job 1
0.030" de-lipped slugs, 70+ atmosphere turbo, ARP studs, Mild Ported Heads (w/bronze guides), Flo-Pro EGR Delete
Mini Maxx Race tuner, AFE exhaust turbo back, S&B Intake, Sinister coolant filter
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post #6 of 11 Old 04-13-2014, 03:10 PM Thread Starter
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Groove, I will keep that in mind. And I don't have stock turbos anymore so you know. I still have all the EGR on my truck. It's next to go. Just wanted to keep pressures out of the intake.
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post #7 of 11 Old 04-13-2014, 04:53 PM
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Quote:
Originally Posted by kw900driver View Post
Groove, I will keep that in mind. And I don't have stock turbos anymore so you know. I still have all the EGR on my truck. It's next to go. Just wanted to keep pressures out of the intake.
yup, chuck out all that EGR stuff

re-read my post and wanted to add to it - think of on a gas car with a turbo. You are hammering on it and then lift your foot. Throttle blades close and trap the boosted air between compressor wheel and the now closed throttle blade(s). If the pressure is high enough, you can stall the turbo or what not. Installing a BOV bleeds off this pressure. On the diesel engine we don't restrict air / only fuel so when you lift the boost created by the still spinning turbo is just fed into the engine

good luck!
what turbos are you running BTW?

08 F350 CCSB 4x4 01/07 Job 1
0.030" de-lipped slugs, 70+ atmosphere turbo, ARP studs, Mild Ported Heads (w/bronze guides), Flo-Pro EGR Delete
Mini Maxx Race tuner, AFE exhaust turbo back, S&B Intake, Sinister coolant filter
Lifted nicely on 20" wheels
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post #8 of 11 Old 04-13-2014, 08:08 PM
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Quote:
Originally Posted by groove View Post
Since a diesel engine has no throttle body (or way to limit air intake) I don't think a BOV is of use. I don't think you can make too much boost with stock turbos... that's not to say running around with the right foot down on a 300 tune is all kittens and rainbows, but
the engine is going to ingest the compressed air when you lift without issue
.
Run 70psi on stock head bolts, yeah, I bet the heads might lift
typically its the high drive pressure that isn't any good, particularly with nitrous - this is thought to push the exhaust valves open (overcoming the valve springs) and possibly contact the piston. Installing a wastegate will limit your drive pressure, but as Woodboy said, why not monitor drive pressure and see what you have before you go down the waste gate road. Plenty of high hp trucks running around without a wastegate
Just my thoughts!
This is highly inaccurate on the BOV situation, you can simply go outside right now and hold your brake, build boost, and let off the throttle suddenly and you will have compressor surge, some people call this 'turbo barking'. It is very hard on turbos and a BOV can be very valuable on larger turbo setups or expensive setups or just turbos more prone to surging. On a stock 6.4 turbo setup it doesn't seem to need a BOV because they are very robust. But diesels can definitely have turbo surge and the sudden drop in RPMs with boost will cause this and you will also find many people that run Elite high powers or max powers (but not limited to) etc. will have BOV installed on these setups

2010 CC/SB FX4 Lariat.. Tuned By Eric@IDP and Matt@Gearhead

Thinking about getting rid of the stock 6.7 turbo?
Check this out... and research before buying



http://www.powerstroke.org/forum/6-7...ustration.html

http://www.powerstroke.org/forum/6-7...round-2-a.html
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post #9 of 11 Old 04-14-2014, 04:40 PM Thread Starter
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Groove, I'm running Industrial Injections twins. They are nice and sound awesome.

And Woodboy, I am having that barking if I close the throttle fast. I just have quite a bit money invested and want to protect my investment.

Mike

'09 F-250 Lariat Crewcab Longbed
6.4 PSD
Spartan tuned
DPF deleted
Industrial Injection twins

EGR to be deleted once I get the blowoff valve installed and lots of other upgrades to come.

Sold:

97 Ford F250 HD Supercab XLT Longbed
AFE Stage 2 Intake
3" dp
Bully Dog exhaust
Hypertech programmer-getting 6 pos chip soon
Hankook all-terrains on Mickey Thompson classic II
Autometer: Pyro, Trans, Boost guages in A-pillar
Beans IDM Mod
Dana 60 swap
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post #10 of 11 Old 04-14-2014, 05:48 PM
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my bad guys

08 F350 CCSB 4x4 01/07 Job 1
0.030" de-lipped slugs, 70+ atmosphere turbo, ARP studs, Mild Ported Heads (w/bronze guides), Flo-Pro EGR Delete
Mini Maxx Race tuner, AFE exhaust turbo back, S&B Intake, Sinister coolant filter
Lifted nicely on 20" wheels
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