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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Suggested Psi range from 5500-7k rpms?



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      02-27-2008, 10:10 AM   #1
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Suggested Psi range from 5500-7k rpms?

Heres a Procede question?

Shiv suggest 15psi max at 5500 rpms, i run 94.7 octane. After that the boost should taper..

what should the boost taper too.. I run my car hard and for long periods of times at high speed on the autobahn. Whats the suggest normal to high PSI that i can play with my settings to taper too up to 7krpm and will still be efficient?..

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      02-27-2008, 04:29 PM   #2
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Oh comon, all the turbo knowledge and no one knows what the suggested max tuned psi from 5k-7k rpms is... ?
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      02-27-2008, 04:37 PM   #3
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How long do you want your car to last?

Seriously, asking anyone's opinion is kinda worthless unless they can say without a doubt that running the car at this boost in 2 years won't destory the turbo.

No long term testing, and is that boost based on the datalog or a boost gauge?? It appears the two are not the same
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      02-27-2008, 04:44 PM   #4
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Robert, remember that you only experience boost when the car is accelerating once up to speed My understanding is that the extreme boost is reduced.

Obviously the turbos spin over but they are not under the load that they would be on HARD acceleration.

Having seen your logs, I'd not worry about it too much, take it up a % or two and see what happens.

End of the day, ANY modifications to the engine are probably going to reduce your engine's life, but how much and how badly, depends on the level of tune you take it to, but you're putting your car to exremes that have not been tested by anyone else, so you're just going to have to test it and take it easy.

I'd say if you're serious about doing it a bosst gauge is now a must... Mine gets to me in 1 week

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      02-27-2008, 05:24 PM   #5
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Quote:
Originally Posted by Serjames View Post
Robert, remember that you only experience boost when the car is accelerating once up to speed My understanding is that the extreme boost is reduced.

Obviously the turbos spin over but they are not under the load that they would be on HARD acceleration.

Having seen your logs, I'd not worry about it too much, take it up a % or two and see what happens.

End of the day, ANY modifications to the engine are probably going to reduce your engine's life, but how much and how badly, depends on the level of tune you take it to, but you're putting your car to exremes that have not been tested by anyone else, so you're just going to have to test it and take it easy.

I'd say if you're serious about doing it a bosst gauge is now a must... Mine gets to me in 1 week

SJ
Thanks James,

Its not that I want to overboost and kill my turbos life.. but im trying to figure out, when i do up the TQ values, what a normal boost tapering amount should be.. of course i dont want to push it, but i have no idea what a normal drop after 5500rpms is..

As for the boost guage, im going to get one as well as i think its quite a wise idea..

cheers
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      02-27-2008, 05:28 PM   #6
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As others have said, it depends on how long you want your turbos to stick around. The stockers are very small and shaft speeds are something to definitely keep in mind as you run higher boost numbers in the upper RPM range. I'm not sure that there is a clear answer to the question of max allowable boost before the reliability of the turbos begins to be significantly impacted. More time and experience will be needed.
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      02-27-2008, 06:45 PM   #7
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Originally Posted by A418t81 View Post
As others have said, it depends on how long you want your turbos to stick around. The stockers are very small and shaft speeds are something to definitely keep in mind as you run higher boost numbers in the upper RPM range. I'm not sure that there is a clear answer to the question of max allowable boost before the reliability of the turbos begins to be significantly impacted. More time and experience will be needed.
I'm not an expert by no means...but your SHOULD TAPER in the higher range. DINAN does it!!! Theres a reason. I even heard the stock does as well. Theres some kind of surge that occurs high up. I also think theres a reason DINAN is considering larger turbos...for this same reason.
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      02-27-2008, 07:11 PM   #8
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Quote:
Originally Posted by TooFastTooFurious View Post
I'm not an expert by no means...but your SHOULD TAPER in the higher range. DINAN does it!!! Theres a reason. I even heard the stock does as well. Theres some kind of surge that occurs high up. I also think theres a reason DINAN is considering larger turbos...for this same reason.
i do not even own a proced, but i remember reading shiv's recommendations of reducing boost past 5,500 rpm. do a good search and i am sure u will find the specific info u r looking for.
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      02-27-2008, 07:55 PM   #9
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Quote:
Originally Posted by TooFastTooFurious View Post
I'm not an expert by no means...but your SHOULD TAPER in the higher range. DINAN does it!!! Theres a reason. I even heard the stock does as well. Theres some kind of surge that occurs high up. I also think theres a reason DINAN is considering larger turbos...for this same reason.
Well i def know that i should taper.. the question is by how much?


I mean should i be seeing the boost drop to around 8psi or 12psi after 5500 rpms? whats seems to be the most common psi range the procede drops to after 5500rpms up to redline..

im just wondering this so when i play with my user torque values, i dont over do it.. i want a safe and normal range, and the psi range after 5500rpms that would be suggested by shiv, but i have no clue what this..
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      02-28-2008, 04:59 AM   #10
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Ok

As per this post

http://www.e90post.com/forums/showth...light=datalogs

It seems like the psi tapers to around 11 psi after 5500rpms to redline..

Would people say this is a healthy amount of boost?..

The thing is, with my V2.02, i drop to like 6-8 psi and i want to make the right adjustments without overdoing it....

If i try to match my psi values to be similar to the post listed. Should i be ok?.. Yes i will only have this car for 1 more year.


Im finding it funny to get a simple response on what the average Procede user tapers to redline after 5500rpms
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      02-28-2008, 05:22 PM   #11
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Aww comon people.. has no one a clue what boost they taper to after 5500rpms? this should be common knowledge... i
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      02-28-2008, 07:01 PM   #12
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Quote:
Originally Posted by rambino View Post
Aww comon people.. has no one a clue what boost they taper to after 5500rpms? this should be common knowledge... i
It depends on the ambient temperature, etc. There is no single value it will drop to. I have seen it drop to 8 - 9 PSI by redline when cool out and the car just got warmed up. But I have also seen it hold 12+ PSI when the ambient temperatures were up and the car was fully warmed.
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      02-28-2008, 11:09 PM   #13
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It depends on the ambient temperature, etc. There is no single value it will drop to. I have seen it drop to 8 - 9 PSI by redline when cool out and the car just got warmed up. But I have also seen it hold 12+ PSI when the ambient temperatures were up and the car was fully warmed.
i understand the differing of boost pressure as related to outside temps, but what do YOU think is a relatively safe max psi boost, and how do you think the boost should taper at say 5,500 rpm to redline (if that is the right rpm to start the taper) regardless of outside temps.... or in other words a general guideline if you may.

thanks
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      02-28-2008, 11:14 PM   #14
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i understand the differing of boost pressure as related to outside temps, but what do YOU think is a relatively safe max psi boost, and how do you think the boost should taper at say 5,500 rpm to redline (if that is the right rpm to start the taper) regardless of outside temps.... or in other words a general guideline if you may.

thanks
That is a somewhat loaded question. Since we are in the infantile stages of knowing what this engine can take, it is a stab...

But I would wager that 14 - 15 PSI could be handled in cool weather. However, the turbos could not maintain the equivalent density amount in warm weather of about 16 - 17 PSI at high revs.
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      02-28-2008, 11:32 PM   #15
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That is a somewhat loaded question. Since we are in the infantile stages of knowing what this engine can take, it is a stab...

But I would wager that 14 - 15 PSI could be handled in cool weather. However, the turbos could not maintain the equivalent density amount in warm weather of about 16 - 17 PSI at high revs.
your comments understood and duly noted.
what about boost taper ? do you agreee that taper should start at 5,500 rpm ? and what should it taper down to? we all understand that this is just your own personal guess based on insufficient information as you so correctly pointed out.
in the end, we all make our own personal decisions based on the best information available + common sense.

thanks
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      02-29-2008, 04:02 AM   #16
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No that i would do this, but with the Procede User Tq Settings,

If i say adjusted the values from 5500-7000 rpms to say 98% (which i wont) would the procede boost to say around 14psi at thos ranges or is the procede map automatically designed to control and taper boost down regardless of the tq settings around those ranges..

Ultimatley i want to try to adjust the values to get 15psi asap all the way until 55000rpms and then taper down to 10-12psi to redline.. (Any thoughts on this?.. does this sound reasonable?, is it possible to do with the TQ Settings?)
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