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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 > GIAC Stage 1 boost graph - WOT 3rd



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      09-04-2009, 04:12 PM   #1
enrita
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GIAC Stage 1 boost graph - WOT 3rd

Was doing some BT logs so i thought why not sharing my low boost
Big thanks to Prince ///M for making the graph !
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      09-04-2009, 04:26 PM   #2
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Thanks for sharing =D

Why does it drop around 2 PSI @ 5K? I mean that drop is instant!?
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      09-04-2009, 04:29 PM   #3
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Apparently with catless dps stage 1 goes in overboosting and therefore there is a drop.
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      09-04-2009, 06:14 PM   #4
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Quote:
Originally Posted by enrita View Post
Apparently with catless dps stage 1 goes in overboosting and therefore there is a drop.
Is that bad? So I'm assuming that this won't happen with the appropriate tune for the mods.

Kinda like running stg1 on PROcede when you're fully catless, when you should be running stg3.

Maybe it's more beneficial for those who are heavily modded to wait till stage 2+ comes out on GIAC, which is what I'm waiting for.......
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      09-04-2009, 08:48 PM   #5
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Quote:
Originally Posted by enrita View Post
Apparently with catless dps stage 1 goes in overboosting and therefore there is a drop.
Maybe that was happening at the dynojet as well.
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      09-04-2009, 08:50 PM   #6
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That looks like the 5k waffle to me. Very interesting, would very much like to know what is causing that cut-off.
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      09-04-2009, 09:34 PM   #7
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What is interesting is the target precedes the actual.

On my B5 S4 GIAC, I would get a similar issue but only at the onset of throttle opening.
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      09-04-2009, 10:44 PM   #8
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thats the kind of shit that will jerk you arund in your car and make it buck like a mechanical bull...

Trust me - I know.... It sucks
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      09-05-2009, 12:08 AM   #9
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Here is my boost log from one of the runs that I did during the video.
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      09-05-2009, 04:57 AM   #10
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that looks...... well, bad.
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      09-05-2009, 07:27 AM   #11
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Quote:
Originally Posted by Mr. 5 View Post
Here is my boost log from one of the runs that I did during the video.
Can you rescale to PSI for easier referencing? But otherwise, that looks correct and thanks.
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      09-05-2009, 09:23 AM   #12
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Quote:
Originally Posted by Borsig View Post
that looks...... well, bad.
If you're talking about mine, I don't understand why you think that.
Remember that the peaks and valleys were when I shifted.

Quote:
Originally Posted by scalbert View Post
Can you rescale to PSI for easier referencing? But otherwise, that looks correct and thanks.
I'll see what I can do to re-scale.
How do you get the actual PSI from the BT outputs? Because I know for a fact that I'm not getting 18-19 psi.
Thanks.
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      09-05-2009, 09:31 AM   #13
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Quote:
Originally Posted by Mr. 5 View Post
If you're talking about mine, I don't understand why you think that.
Remember that the peaks and valleys were when I shifted.
think he was referring to mine Mr.5 . Maybe Borsig can go a big deeper on his comment so that i can understand why. I post this stuff to learn from other members and understand how the tune work.
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      09-05-2009, 10:58 AM   #14
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No no, my bad guys...

I was thinking that Mr.5's graph was from a single gear pull, not one where he shifted.
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      09-05-2009, 11:02 AM   #15
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Quote:
Originally Posted by Mr. 5 View Post
I'll see what I can do to re-scale.
How do you get the actual PSI from the BT outputs? Because I know for a fact that I'm not getting 18-19 psi.
Thanks.
Create a new column in Excel and use the following formula:

=(A1-10)/10*14.5

But replace the A1 with the appropriate cell for the pressure in front of throttle. Then copy and paste to the rest of the rows.
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      09-05-2009, 04:51 PM   #16
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Quote:
Originally Posted by scalbert View Post
Create a new column in Excel and use the following formula:

=(A1-10)/10*14.5

But replace the A1 with the appropriate cell for the pressure in front of throttle. Then copy and paste to the rest of the rows.
Thanks for that equation Scalbert! I've always wondered how to determine the actual PSI based on the BT logs.
Here's the same graph but I put things into better perspective using your equation.

I started in 2nd gear at 40mph, then went to 3rd and ended in 4th.
GIAC states that the reason why actual boost is higher than specified is due to running the stage 1 tune on a stage 2 car. I'm slightly overboosting but this should be taken care of in a couple weeks.
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      09-05-2009, 04:57 PM   #17
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There is that strange boost oscillation around 5200RPM, it occurs in all graphs. And Mr. 5 graph is not on the dyno, its on the road. Can't be said that it is the dyno's fault because the software is tuned for the road...
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      09-05-2009, 05:09 PM   #18
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Quote:
Originally Posted by cstavaru View Post
There is that strange boost oscillation around 5200RPM, it occurs in all graphs. And Mr. 5 graph is not on the dyno, its on the road. Can't be said that it is the dyno's fault because the software is tuned for the road...
Not on relatively stock cars with a catback only or less.
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      09-05-2009, 05:33 PM   #19
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We are all too tuned for stage 1. would be nice to hava a member with stock car and stage 1.
I am sure the issue on our cars will be resolved with stage 2 or higher.
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      09-05-2009, 06:11 PM   #20
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We are all too tuned for stage 1. would be nice to hava a member with stock car and stage 1.
I am sure the issue on our cars will be resolved with stage 2 or higher.
Agree. I was warned before I got the flash that my car might not run perfect since my car is stage 2 running a stage 1 tune, but if this isn't considered perfect, I'm really looking forward to what they consider perfect.
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      09-05-2009, 06:19 PM   #21
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Quote:
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Agree. I was warned before I got the flash that my car might not run perfect since my car is stage 2 running a stage 1 tune, but if this isn't considered perfect, I'm really looking forward to what they consider perfect.
! While i am waiting i am going to test and stack a jb+ on top of Giac pushing 1 extra Psi 
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      09-05-2009, 07:16 PM   #22
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! While i am waiting i am going to test and stack a jb+ on top of Giac pushing 1 extra Psi 
Be carefull man.
Tomorrow, I'm meeting up with a manual trans JB3 with the same mods installed. I couldn't find an MT procede.
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