BD Exhaust manifold kits

[sootie]

Originally Posted by Black AOD

I know, right. Youd think they have learned by now.

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They fail in stock form?

[Black AOD]

Originally Posted by sootie

They fail in stock form?

Not commonly but some.

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[HeavyAssault]

Originally Posted by 6.7Bison

I bought a set for my 2011. Turbo started surging/fluttering under steady throttle up a hill with or without a trailer at 52-54 mph just like it's laid out in TSB 11-12-14. So while I'm in this far replacing to an updated '14 turbo and WW2 (make fun of me if you wish) I was going to do the studs and manifolds for reliability after hearing about them being fairly common to break and hopefully some performance (wasn't too much more expensive than stock replacements). I asked BD about what to expect and got a nondescript:
"Our manifolds improve on the reliability of the Ford manifold, while improving the radius’s from each cylinder."
It will be mid June before I get them in the truck but they look good in person. I can let you know more after install. I don't think I will be able to pinpoint specifics on performance of the manifold upgrade though since I have more changes going on at the same time.

Thank you. Sounds like the drive ability will be where you get the improvement. Maybe monitor the PIDs a tad more to see what changes. I know in the past my mods like this made the turbo much more driveable and had better spooling. Airflow makes it all go....

[6.7Bison]

HeavyAssault,

Any specific PIDs you want me to compare? I'm struggling thinking of one that might tell me how much better the manifold is flowing. EGTs maybe? There is a back pressure measurement but I believe that is across the ***.

[HeavyAssault]

I don't know where a 2011 pulls EBP so I can't help there. I would say it's not going to be just one overall.



Fuel Pressure, Boost, EGT, EBP (if location is known), MAF. The Boost/EBP ratio would be good data to collect. If 2011 EBP is pre-turbo that would be awesome.



Post mods I'd say if the turbo/motor was more responsive there may be a drop across the board to which I'd say that shows a flow path improvement.


I know I'd pull up whatever PIDs seem reasonable with whatever device you are using. Then just data log the info. Maybe down the road there could be some targeted PID collection while dropping others off.



I got the new CTS3 which gives me plenty of data to follow. You are doing alot of mods. I doubt we could say XXXX changed it the most but the overall package can be shown to have an significant impact. Sure people want to buy one thing and get the best result. People need to realize there's more than one thing that makes great gains.

[jcain]

Doubt you see any tangible difference. The runner lengths didn't change hardly

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[HeavyAssault]

I'd agree on a mainly stock truck. With any significant mods to the airflow path, there's going to be additional changes made....is it 100HP? No, but there's going to be change made in performance.


I liken my experiences to my 6.0L that got the basic mods done. It drove amazingly, had impressive pedal response, HP & TQ improved, and had decent MPGs.



Biggest changes for my 6.0 were with the ported intake manifold, P-Max w/single plane wheel, modded y-pipes.

[6.7Bison]

Originally Posted by HeavyAssault

I don't know where a 2011 pulls EBP so I can't help there. I would say it's not going to be just one overall.



Fuel Pressure, Boost, EGT, EBP (if location is known), MAF. The Boost/EBP ratio would be good data to collect. If 2011 EBP is pre-turbo that would be awesome.



Post mods I'd say if the turbo/motor was more responsive there may be a drop across the board to which I'd say that shows a flow path improvement.


I know I'd pull up whatever PIDs seem reasonable with whatever device you are using. Then just data log the info. Maybe down the road there could be some targeted PID collection while dropping others off.



I got the new CTS3 which gives me plenty of data to follow. You are doing alot of mods. I doubt we could say XXXX changed it the most but the overall package can be shown to have an significant impact. Sure people want to buy one thing and get the best result. People need to realize there's more than one thing that makes great gains.

I can't find where that specific PID is being pulled from but its never gotten above 1 psi so there is no way that is drive pressure unless my truck is a miracle. I've found *** inlet pressure but from what I remember from fluids mechanics that won't tell us anything about the improvements made upstream. I will log it just in case we think we can learn anything from it's results.

I'm using a Car Scanner Pro app and a Micro Mechanic Bluetooth OBDII. Got the bluetooth connector as a grab-bag Christmas present and paid $8 for the app and I must say I am very happy with it especially for what I have in it.

I'm going to do a log of boost, fuel rate, fuel pressure, egt, vgt position, *** inlet pressure, and maf this afternoon. I did one this morning for intake air temp, boost, maf, and cac temp for the compressor wheel comparison. I will do another one involving ambient temp, intake temp, cac temp, egt, egr temp, and egr rate as I'm doing some thermal coating as well and want to see how my temps are effected.

I agree that it makes little sense to go in and swap out just the exhaust manifolds on an otherwise stock truck. But if you need to replace them anyway or have other modifications it would play well with, every little bit helps.

[Sleepersilverado]

I did not read all this but I bought a set as I was putting the motor back together and I found out the stock ones were not true anymore. Did not know that but I suppose when Cody had truck getting compounds that pass side was changed to 16+. Anyway I got lucky and BD sold me the new pass side while it was still a R&D part. They are beast compared to stock.

Believe it or not had more clearance on head studs than factory.

[HeavyAssault]

Looks like a great piece!