GIAC Stage 1 Max Psi

sleepergm · 12-03-2010, 06:33 AM

Hi,

I have the stage 1 Giac software and was wondering what the max boost I should be reading? I only get 11psi max...

On a side note, I was supposed to have stage 2 installed today and went for a test drive after the install and am still only getting 11psi. Makes me think they installed stage 1 again.

What Psi should I register with stage 2?

Thanks

vasillalov · 12-03-2010, 07:13 AM

You probably have a boost leak. Giac S1 is about 14psi. S2 is about 16.9 psi.

FLA 335 · 12-03-2010, 08:28 AM

Hey, if you are reaching the TQ targets with less PSI you won't see 13.6 psi...

Meaning do you have other mods? Downpipe, intercooler, intake, exhaust, etc ??

Giac works on TQ targets not strictly pSI...

vasillalov · 12-03-2010, 09:24 AM

^^^
Very true!

techlogik · 12-03-2010, 09:28 AM

Quote:

Originally Posted by FLA 335

Hey, if you are reaching the TQ targets with less PSI you won't see 13.6 psi...

Meaning do you have other mods? Downpipe, intercooler, intake, exhaust, etc ??

Giac works on TQ targets not strictly pSI...

Explain?

tscdennab · 12-03-2010, 09:42 AM

Quote:

Originally Posted by techlogik

Explain?

GIAC and BMW software work on torque targets. The engine sais "I need X lb-fts of torque" and then boost is upped until that torque is reached. If supporting mods are employed, such as an intercooler which helps for cooler (and denser) air entering the engine, a lower boost of colder air provides the same oxygen levels as a higher boost of hotter air.

cent778 · 12-03-2010, 10:10 AM

Quote:

Originally Posted by vasillalov

You probably have a boost leak. Giac S1 is about 14psi. S2 is about 16.9 psi.

I am inclined to agree with Vasillalov.

Stage 1 should be boosting around 13.8psi +/- 1psi depending on conditions (weather, AIT, supporting mods etc...)

In order to be running S2 you are required supporting mods. I have seen boost between 16-17.1psi on my S2 tune.

Best to check for leaks, do a 3rd or 4th gear pull and register your boost levels.

vasillalov · 12-03-2010, 10:33 AM

cent778,

What DV/BOV are you using?

enrita · 12-03-2010, 10:39 AM

You would limp if you had a boost leak since you could not reach the tq targets....i am more inclined to think you boost gauge is not calibrated right.

cent778 · 12-03-2010, 10:44 AM

Quote:

Originally Posted by vasillalov

cent778,

What DV/BOV are you using?

Running stock DV and no BOV as I'm a A/T.
The stock DV are holding up pretty well so, if it's not broke don't fix it

vasillalov · 12-03-2010, 10:47 AM

Quote:

Originally Posted by cent778

The stock DV are holding up pretty well so, if it's not broke don't fix it

Cool! Thanks. I am also running the stock DVs and they seem to be doing fine. I am running S1 as I need to get an intercooler, which has to wait till the spring.

sleepergm · 12-03-2010, 08:07 PM

I have all the required mods ... I am inclined to think I have a boost leak somewhere since I have never seen more than 11psi of boost. The mechanic who installed the stage 2 said the ECU needs to adapt ...? Is this true?

I think I will need to pressure test the whole system?

My current mods are - Custom DP, Forge intercooler and DV, Eisenmann Race Exhaust, Injen DCI Intake, Stage 2 Gaic Software, Burger O2 Fix, air scoops.

If I have a boost leak will the car throw a code?

Where should I check first?

Thanks

enrita · 12-03-2010, 10:04 PM

You would boost More if you had a leak and the car would probably limp. Do you have a boost gauge? Which one?
Let the car adapt and recalibrate the boost gauge.

sleepergm · 12-03-2010, 10:50 PM

Hi Enrita ...

I have a regular manual boost gauge ... by Turbo boost I think. Should be reading fine - but I might have a break in the line running into the guage maybe. The car does not burn over in second gear only breaks the tires loose in first. So i know I am not putting the power down.

If I give the ECU more time to adapt ... will the boost increase? That is what the tech who installed it said. It has only 18 miles since the install of G2 ...

Also just drove the car more ... and it feels hesitate at higher boost levels - not smooth when accelerating - leading me to think there is a boost leak. Still only holding 11psi.

Daya · 12-04-2010, 10:54 AM

cooler outside temps will also result in lower peak boost

enrita · 12-04-2010, 06:04 PM

Quote:

Originally Posted by sleepergm

Hi Enrita ...

I have a regular manual boost gauge ... by Turbo boost I think. Should be reading fine - but I might have a break in the line running into the guage maybe. The car does not burn over in second gear only breaks the tires loose in first. So i know I am not putting the power down.

If I give the ECU more time to adapt ... will the boost increase? That is what the tech who installed it said. It has only 18 miles since the install of G2 ...

Also just drove the car more ... and it feels hesitate at higher boost levels - not smooth when accelerating - leading me to think there is a boost leak. Still only holding 11psi.

just take the car back to the shop that did the GIAC installation and let them troubleshoot.

tscdennab · 12-04-2010, 06:19 PM

Quote:

Originally Posted by sleepergm

but I might have a break in the line running into the guage maybe.

That is a BIG issue. It's a leak. It doesn't only cause your gauge to misread, it causes the engine to misinterpret some things too.

12-03-2010, 06:33 AM	#1
sleepergm Lieutenant 35 Rep 541 Posts Drives: White 335i M-Tech Join Date: May 2007 Location: Hong Kong iTrader: (2)	GIAC Stage 1 Max Psi Hi, I have the stage 1 Giac software and was wondering what the max boost I should be reading? I only get 11psi max... On a side note, I was supposed to have stage 2 installed today and went for a test drive after the install and am still only getting 11psi. Makes me think they installed stage 1 again. What Psi should I register with stage 2? Thanks
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12-03-2010, 07:13 AM	#2
vasillalov Mad Linux Guru On The Loose 1121 Rep 5,396 Posts Drives: 2008 335i Sedan, 2023 M3 Join Date: Aug 2009 Location: Chicago, IL iTrader: (5) Garage List 2023 BMW M3 [0.00] 2008 335i E90 [8.00]	You probably have a boost leak. Giac S1 is about 14psi. S2 is about 16.9 psi. __________________ 6MT \| COBB \| AR \| AE \| Forge DV \| HPF \| P3 Gauge \| Hybrid Intake \| O.S.Giken TCD \| All M3 bits \| TCKLine \| StopTech \| UUC \| ER \| SPEC
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12-03-2010, 08:28 AM	#3
FLA 335 Captain 24 Rep 746 Posts Drives: 2009 335i (SOLD) !!!!! Join Date: Sep 2009 Location: Miami Fl iTrader: (7)	Hey, if you are reaching the TQ targets with less PSI you won't see 13.6 psi... Meaning do you have other mods? Downpipe, intercooler, intake, exhaust, etc ?? Giac works on TQ targets not strictly pSI... __________________ 2009 BMW 335i Sedan / Auto / Paddles / Sport / BMW Assist / Heated seats / JB Matte Black Grill / Tischer First Aid Kit w\Triangle / Tischer Hood Pad / "Custom" rear fog switch <---- SOLD!!!!
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12-03-2010, 09:24 AM	#4
vasillalov Mad Linux Guru On The Loose 1121 Rep 5,396 Posts Drives: 2008 335i Sedan, 2023 M3 Join Date: Aug 2009 Location: Chicago, IL iTrader: (5) Garage List 2023 BMW M3 [0.00] 2008 335i E90 [8.00]	^^^ Very true! __________________ 6MT \| COBB \| AR \| AE \| Forge DV \| HPF \| P3 Gauge \| Hybrid Intake \| O.S.Giken TCD \| All M3 bits \| TCKLine \| StopTech \| UUC \| ER \| SPEC
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12-03-2010, 10:33 AM	#8
vasillalov Mad Linux Guru On The Loose 1121 Rep 5,396 Posts Drives: 2008 335i Sedan, 2023 M3 Join Date: Aug 2009 Location: Chicago, IL iTrader: (5) Garage List 2023 BMW M3 [0.00] 2008 335i E90 [8.00]	cent778, What DV/BOV are you using? __________________ 6MT \| COBB \| AR \| AE \| Forge DV \| HPF \| P3 Gauge \| Hybrid Intake \| O.S.Giken TCD \| All M3 bits \| TCKLine \| StopTech \| UUC \| ER \| SPEC
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12-03-2010, 10:39 AM	#9
enrita Major General 159 Rep 7,378 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	You would limp if you had a boost leak since you could not reach the tq targets....i am more inclined to think you boost gauge is not calibrated right. __________________ 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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12-03-2010, 08:07 PM	#12
sleepergm Lieutenant 35 Rep 541 Posts Drives: White 335i M-Tech Join Date: May 2007 Location: Hong Kong iTrader: (2)	I have all the required mods ... I am inclined to think I have a boost leak somewhere since I have never seen more than 11psi of boost. The mechanic who installed the stage 2 said the ECU needs to adapt ...? Is this true? I think I will need to pressure test the whole system? My current mods are - Custom DP, Forge intercooler and DV, Eisenmann Race Exhaust, Injen DCI Intake, Stage 2 Gaic Software, Burger O2 Fix, air scoops. If I have a boost leak will the car throw a code? Where should I check first? Thanks
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12-03-2010, 10:04 PM	#13
enrita Major General 159 Rep 7,378 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	You would boost More if you had a leak and the car would probably limp. Do you have a boost gauge? Which one? Let the car adapt and recalibrate the boost gauge. __________________ 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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12-03-2010, 10:50 PM	#14
sleepergm Lieutenant 35 Rep 541 Posts Drives: White 335i M-Tech Join Date: May 2007 Location: Hong Kong iTrader: (2)	Hi Enrita ... I have a regular manual boost gauge ... by Turbo boost I think. Should be reading fine - but I might have a break in the line running into the guage maybe. The car does not burn over in second gear only breaks the tires loose in first. So i know I am not putting the power down. If I give the ECU more time to adapt ... will the boost increase? That is what the tech who installed it said. It has only 18 miles since the install of G2 ... Also just drove the car more ... and it feels hesitate at higher boost levels - not smooth when accelerating - leading me to think there is a boost leak. Still only holding 11psi. Last edited by sleepergm; 12-04-2010 at 04:54 AM..
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12-04-2010, 10:54 AM	#15
Daya Lieutenant Colonel 200 Rep 1,741 Posts Drives: e92 335 space gray/coral red Join Date: Sep 2006 Location: Chicago iTrader: (1) Garage List 2007 E92 335 [9.66]	cooler outside temps will also result in lower peak boost __________________ GIAC S2 \| Brembo GT BBK 355/345 \| BBS CH-R \| Michelin Pilot Super Sports \| AR Design: DP, S1 Oil Cooler, OCC \| AMS FMIC \| Bastuck Quad Exhaust \| Borla MP \| KW V1 \| Stett: CAI, CP \| Forge DV \| P3 Boost Gauge \| Arkym: Front Lip, Rear Quad Diffuser \| Vorsteiner CSL Trunk \| LUX H8 \| ModMyNav \| MFD M3 Sideskirts \| BMW M-Tech Front/Rear Bumpers, Edition Grills
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