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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 > My V2 datalogging, 15.2psi @ 90% on 93 octane



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      12-22-2007, 07:45 PM   #23
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Quote:
Originally Posted by Hokie 335i View Post
I thought we were supposed to do a 2nd/3rd pull? That's what I was doing. Could this also cause the higher boost?

Also, just wanted confirmation from you Shiv, I'm definitely getting the same power as other people at 15psi though regardless of the torque value setting, right?
Please read the documentation at the v2.0.2 documentation site. It will explain the kind of runs you need to do.

And yes, it is boost level that dictates power output, not necessary the User TQ settings.

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      12-22-2007, 07:45 PM   #24
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Originally Posted by that guy nico View Post
what's the highest boost we should be running safe wise?
On pump gas, I like to keep things to a maximum of 14.5-15psi. This is excluding short-term boost spikes.

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      12-22-2007, 10:03 PM   #25
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Quote:
Originally Posted by shiv@vishnu View Post
Please read the documentation at the v2.0.2 documentation site. It will explain the kind of runs you need to do.

And yes, it is boost level that dictates power output, not necessary the User TQ settings.

Shiv
I did read the documentation, that's why I did successive 2nd/3rd gear pulls. This is what is said: "If local speed laws prohibit you from going that fast, do successive 2nd to 3rd gear pulls with minimal cool down between runs. This will get things sufficiently hot to induce maximum boost levels. If you see 14.5-15psi at 5500rpm, leave your User Torque table alone. You are already running the maximum allowable boost pressure."

I lowered my torque settings down to 89% tonight before heading out. I'll leave it there for a few days and then re-do the datalogs since everything should be adapted. I gotta say the car does drive like a bat out of hell in 1st/2nd/3rd especially at higher RPMs. It's just so much smoother. The only thing I'm missing is the super easy passing power in lower RPMs (under 3.5k) in 4th-6th gears. Sounds like V2.03 might take care of that!
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      12-22-2007, 10:18 PM   #26
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Quote:
Originally Posted by Hokie 335i View Post
I did read the documentation, that's why I did successive 2nd/3rd gear pulls. This is what is said: "If local speed laws prohibit you from going that fast, do successive 2nd to 3rd gear pulls with minimal cool down between runs. This will get things sufficiently hot to induce maximum boost levels. If you see 14.5-15psi at 5500rpm, leave your User Torque table alone. You are already running the maximum allowable boost pressure."

I lowered my torque settings down to 89% tonight before heading out. I'll leave it there for a few days and then re-do the datalogs since everything should be adapted. I gotta say the car does drive like a bat out of hell in 1st/2nd/3rd especially at higher RPMs. It's just so much smoother. The only thing I'm missing is the super easy passing power in lower RPMs (under 3.5k) in 4th-6th gears. Sounds like V2.03 might take care of that!
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      01-04-2008, 10:06 PM   #27
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curious. i havent logged yet due to the weather. 16 deg. this morning. but i had my friend watch the boost guage on the user software and he said at 6500 rpm i was making 14.7 psi. seems like alot of us are making the high boost number at the default settings. need to logg asap. damn weather! i should have stayed in west palm beach.
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      01-04-2008, 10:08 PM   #28
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Quote:
Originally Posted by chris b. View Post
curious. i havent logged yet due to the weather. 16 deg. this morning. but i had my friend watch the boost guage on the user software and he said at 6500 rpm i was making 14.7 psi. seems like alot of us are making the high boost number at the default settings. need to logg asap. damn weather! i should have stayed in west palm beach.
No way you're making that kind of boost at 6500rpm at WOT. What he saw was a boost spike caused by the throttle closing just before redline. I never see much more than 12-13psi at 6500rpm regardless of what I have in the user tq table.

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      01-04-2008, 10:10 PM   #29
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ok then i should only be concerned with what im making at 5500 then correct, and adjust accordingly?
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      01-04-2008, 10:13 PM   #30
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ok then i should only be concerned with what im making at 5500 then correct, and adjust accordingly?
Yep. But you shouldn't ignore higher boost at higher rpm. It's just very unlikely given turbo limitations. But I can say with confidence that you're friend didn't read boost when the throttle was fully open.

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      01-04-2008, 10:15 PM   #31
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agreed. need to get these loggs done. think the weather will give me innacurate readings?

thanks for the quick reply's
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      01-04-2008, 10:16 PM   #32
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agreed. need to get these loggs done. think the weather will give me innacurate readings?
Inaccurate readings? I don't see why.

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      01-04-2008, 10:18 PM   #33
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extremely low ambient temp doesnt matter? im sure dme will compensate, maybee im just looking too far into it. need to just do it. thanks.

-do you remember what type of dyno we used in albany back in april?
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      01-10-2008, 04:51 PM   #34
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Shiv, I'm bringing this issue back up because since I first posted it you have now stated that increasing the torque numbers give you additional power without always giving a big increase in boost and that other factors are making the power increase. This makes me believe that I am making less power than I should be since I have to go down under 89% to get my boost under 15psi (outside spikes). I am also worried that I seem to be the only one making over 15psi stock when running at 90 and 89% torque. Is there anything else that could be wrong?
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      01-10-2008, 04:54 PM   #35
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Just replied to you in the other thread.

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      01-10-2008, 05:13 PM   #36
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Hokie,

don"t worry so much.
your datalogs look great!

if you are making 15 psi boost, you are getting full power.
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      01-10-2008, 05:31 PM   #37
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bro those are great datalogs! Safe is for the birds!
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      01-10-2008, 06:01 PM   #38
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Well evidently it's not normal as Shiv said in the other thread. Shiv, thanks for getting back to me, I'll try datalogging it this weekend at 70%. Does anything else look out of the ordinary in my datalogs?
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      01-10-2008, 06:32 PM   #39
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Quote:
Originally Posted by Hokie 335i View Post
Well evidently it's not normal as Shiv said in the other thread. Shiv, thanks for getting back to me, I'll try datalogging it this weekend at 70%. Does anything else look out of the ordinary in my datalogs?
Actually, you're datalogs look great.

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      01-11-2008, 07:56 AM   #40
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Sorry if im hijacking,,

Shiv, in germany i have equivalent to 94.7 us Octane.. Would i be safe to boost up to 15.5 with this? I do plan on datalogging and posting once i get things installed..

Thanks..
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      01-11-2008, 11:29 AM   #41
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Originally Posted by shiv@vishnu View Post
Actually, you're datalogs look great.

Shiv
What about the points where the boost drops off and then picks back up all while RPMs are increasing? I see other datalogs where the boost is a smooth plateau through an entire pull. This isn't shown in the 90% log but it is in the 89% log I have in the other thread that you commented on.
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      01-11-2008, 12:57 PM   #42
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Sorry if im hijacking,,

Shiv, in germany i have equivalent to 94.7 us Octane.. Would i be safe to boost up to 15.5 with this? I do plan on datalogging and posting once i get things installed..

Thanks..
Keep maximum boost in the 14.5-15psi range as per the suggestions. Even on your 95oct fuel

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      01-11-2008, 12:59 PM   #43
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Quote:
Originally Posted by Hokie 335i View Post
What about the points where the boost drops off and then picks back up all while RPMs are increasing? I see other datalogs where the boost is a smooth plateau through an entire pull. This isn't shown in the 90% log but it is in the 89% log I have in the other thread that you commented on.
Totally normal for boost to drop a bit in the 4500-5000rpm range. This is due to a big cam timing phase shift. If you look at your torque curve (you'll need to dyno your car for that), this area will be nice and flat. Nothing to worry about.

If you may also see a bump in boost towards redline (6800-7000rpm). This is caused by the throttle starting to automatically close. When this happens, you get a bump in pressure in the intercooler tube (where we are measuring boost). This is normal too. And, as mentioned many times, you will also get a spike of boost when you lift off the throttle for the same reason.

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      01-11-2008, 01:15 PM   #44
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Originally Posted by shiv@vishnu View Post
Totally normal for boost to drop a bit in the 4500-5000rpm range. This is due to a big cam timing phase shift. If you look at your torque curve (you'll need to dyno your car for that), this area will be nice and flat. Nothing to worry about.

If you may also see a bump in boost towards redline (6800-7000rpm). This is caused by the throttle starting to automatically close. When this happens, you get a bump in pressure in the intercooler tube (where we are measuring boost). This is normal too. And, as mentioned many times, you will also get a spike of boost when you lift off the throttle for the same reason.

Shiv
Sounds good Shiv. I'll go out and log some more runs this weekend at 70% and then back around 90%. Is there ANYTHING that could be causing my car to generate the >15psi at 89-90% that I should be looking for? I'm guessing it's not wiring since I get no limp modes or codes but could it be a kinked hose or something? I just really wish I could get my car to run at 13-13.5psi at 90% like everyone else since I'm at sea-level and I'm running in normal temps so I'm just looking for anything that I could go check to see if it's messed up.
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