Using BT tool to read boost

Brey335i · 10-23-2010, 02:42 AM

I have a buddy who just got the Dinan Stage 1 for his 135. But he feels like there isn't a significant difference at all. I already told him that the Dinan Stage 1 is a conservative tune, but he want to ensure that they really dd flash his car with it.

So is there a way to use the BT tool to read the amount of boost or some other way to clearly tell whether he has Dinan or not? I know there will be some answers like "if the traction control goes off in 2nd gear. blah blah" but he really wants hard data

Thanks

enrita · 10-23-2010, 02:44 AM

boost gauge?
or with BT tool:
Target boost in PSI= (target boost BT -100)/100*14.5
Boost in PSI= (pressure in front of throttle valve -1000)/1000*14.5

scrufy · 10-23-2010, 02:53 AM

Quote:

Originally Posted by enrita

boost gauge?
or with BT tool:
Target boost in PSI= (target boost BT -100)/100*14.5
Boost in PSI= (pressure in front of throttle valve -1000)/1000*14.5

Wow! thanks Enrita. I only used the BT to clear my codes and never really looked at the stuff it showed. I'm going to do this tomorrow.
Thanks again for that...

Brey335i · 10-23-2010, 02:55 AM

Quote:

Originally Posted by enrita

boost gauge?
or with BT tool:
Target boost in PSI= (target boost BT -100)/100*14.5
Boost in PSI= (pressure in front of throttle valve -1000)/1000*14.5

So you're saying that the Target Boost - 100 then multiplied by 14.5 should give you the exact psi? Thanks. I'll let him know.

This probably means a late night for me. He's gonna have me riding along with him all night logging hahaha

Brey335i · 10-25-2010, 04:05 PM

Yeah sorry for reviving this thread again... but:

Went out to try it, choose Target Boost Pressure to datalog. Returned a highest value of 1557.81.

Now the way I understood enrita, we would subtract 100 from that number. Divide by 100. and then multiply by 14.5. However, that yields a number far too high.

If we follow his second approach, it yields a final number of 8.08 psi. That seems right, but we didn't choose to datalog pressure in front of throttle valve. We chose to datalog Target Boost Pressure.

Anyone able to clarify this for me?

F104 · 10-25-2010, 04:50 PM

Quote:

Originally Posted by Brey335i

Yeah sorry for reviving this thread again... but:

Went out to try it, choose Target Boost Pressure to datalog. Returned a highest value of 1557.81.

Now the way I understood enrita, we would subtract 100 from that number. Divide by 100. and then multiply by 14.5. However, that yields a number far too high.

If we follow his second approach, it yields a final number of 8.08 psi. That seems right, but we didn't choose to datalog pressure in front of throttle valve. We chose to datalog Target Boost Pressure.

Anyone able to clarify this for me?

Mine is a 320d. When i log i get 2.57 Bar (it reads 2,570.00 on the datalog) boost which is about correct. That is absolute, so 1.57 bar 'real' boost pressure. To get Psi multiply that by 14.5, so 22.7psi boost. You read probably 1.557, so 0.557 real boost, times 14.5 is 8.07 psi. If you want to get real academic you have to subtract the real ambient pressure instead of 1.0bar

Ilma · 10-25-2010, 04:57 PM

BT tool will return boost values in kilopascals or such.

You have to convert that to psi first and then apply Enrita's equation.

Go figure.

1 kilopascal = 0.145037738 pounds per square inch, so the post prior to mine is correct.

10-23-2010, 02:42 AM	#1
Brey335i Banned 112 Rep 4,771 Posts Drives: e46 ///M3 Join Date: Oct 2009 Location: Austin, TX iTrader: (11)	Using BT tool to read boost I have a buddy who just got the Dinan Stage 1 for his 135. But he feels like there isn't a significant difference at all. I already told him that the Dinan Stage 1 is a conservative tune, but he want to ensure that they really dd flash his car with it. So is there a way to use the BT tool to read the amount of boost or some other way to clearly tell whether he has Dinan or not? I know there will be some answers like "if the traction control goes off in 2nd gear. blah blah" but he really wants hard data Thanks
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10-23-2010, 02:44 AM	#2
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	boost gauge? or with BT tool: Target boost in PSI= (target boost BT -100)/10014.5 Boost in PSI= (pressure in front of throttle valve -1000)/100014.5 __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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10-25-2010, 04:05 PM	#5
Brey335i Banned 112 Rep 4,771 Posts Drives: e46 ///M3 Join Date: Oct 2009 Location: Austin, TX iTrader: (11)	Yeah sorry for reviving this thread again... but: Went out to try it, choose Target Boost Pressure to datalog. Returned a highest value of 1557.81. Now the way I understood enrita, we would subtract 100 from that number. Divide by 100. and then multiply by 14.5. However, that yields a number far too high. If we follow his second approach, it yields a final number of 8.08 psi. That seems right, but we didn't choose to datalog pressure in front of throttle valve. We chose to datalog Target Boost Pressure. Anyone able to clarify this for me?
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10-25-2010, 04:57 PM	#7
Ilma Colonel 184 Rep 2,841 Posts Drives: 2008 135i Join Date: Nov 2008 Location: Mississauga iTrader: (0)	BT tool will return boost values in kilopascals or such. You have to convert that to psi first and then apply Enrita's equation. Go figure. 1 kilopascal = 0.145037738 pounds per square inch, so the post prior to mine is correct.
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