Second hose blew after first WOT with new IC

badh3ro · 07-06-2015, 01:27 PM

Hello!
So couple days back I decided to upgrade my car with 3" downpipes and big intercooler (KL racing aka big tom).
Everything went smooth during the install exapt that we forgot to mark O2 sensors and decided to test drive car any way, well after 10 min of driving we heard LOUD explosion under the car with turned out to be hose from my new intercooler.

Today we switched lamda sensors and changed damaged hose with was totaly blown.
I thought that I passed all my problems so I've switched my cobb to drive stg2+ (mildest map on FBO).
During first WOT hose exploaded again...

What could possible cause hose to expload like that? Explosion was rly LOUD and scared the shit out of me bouth times.
Hose's with I am using look kinda like stock ones, just larger and small difference in material, could they just be bad? Never thought that intercooler has so much pressure in it to blow plastic hose like that.

Car - 335i e92 2007 MT euro
Tune - cobb st2+ drive
Intercooler - KL racing aka BIG TOM
Downpipes - 3", no dp fix.
I do have a wastegate rattle with I can hear only after 3000rpm.

csu87 · 07-06-2015, 02:02 PM

cheap silicone couplers will blow like that under higher pressures. not familiar with what kind of couplers they are using in that kit. Take a look at the ends of the coupler and see how many layers there are.

jazredgt · 07-06-2015, 02:15 PM

Stock blow off diverters or aftermarket blow off valve? Did you accidently forget to hook the vac line back to the BOV's? That would cause no where for the air to go except kaboom hose or couplers. Eventually kaboom turbo too.

Tiago@VRSF · 07-06-2015, 06:46 PM

Poor quality silicone couplers, clamps or improperly beaded tubing/piping will cause continuous blow off issues.

tc535i · 07-06-2015, 06:49 PM

blew into pieces? or just blew off the car?

what boost are you seeing at "stg 2+"?

Mike@N54Tuning.com · 07-06-2015, 09:22 PM

What kind of clamps are you using?

Mike

F80Mmm · 07-07-2015, 11:17 PM

plastic hose? hmmm

T-Bolt clamps are a man's best friend

+1 VRSF downpipes + intercooler

badh3ro · 07-11-2015, 12:21 PM

I am sorry for such a late reply, was very beasy lately.
It was just poor quality hoses, I bought some reinforced ones and WOT my car at least 10 times now in 2-3-4 gear's and didn't had any problems (stock tune tho, don't want to risk with cobb yet as I have to drive around 1500 miles tomorrow).

I had normal plastic\rubber hoses, with apperently couldn't hold the pressure of big intercooler.

07-06-2015, 01:27 PM	#1
badh3ro Enlisted Member 9 Rep 43 Posts Drives: f32 430d Join Date: Apr 2014 Location: Valencia iTrader: (0)	Second hose blew after first WOT with new IC Hello! So couple days back I decided to upgrade my car with 3" downpipes and big intercooler (KL racing aka big tom). Everything went smooth during the install exapt that we forgot to mark O2 sensors and decided to test drive car any way, well after 10 min of driving we heard LOUD explosion under the car with turned out to be hose from my new intercooler. Today we switched lamda sensors and changed damaged hose with was totaly blown. I thought that I passed all my problems so I've switched my cobb to drive stg2+ (mildest map on FBO). During first WOT hose exploaded again... What could possible cause hose to expload like that? Explosion was rly LOUD and scared the shit out of me bouth times. Hose's with I am using look kinda like stock ones, just larger and small difference in material, could they just be bad? Never thought that intercooler has so much pressure in it to blow plastic hose like that. Car - 335i e92 2007 MT euro Tune - cobb st2+ drive Intercooler - KL racing aka BIG TOM Downpipes - 3", no dp fix. I do have a wastegate rattle with I can hear only after 3000rpm.
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07-06-2015, 02:02 PM	#2
csu87 Banned 2130 Rep 3,553 Posts Drives: 09 335xi Join Date: Nov 2013 Location: Northern Colorado iTrader: (0)	cheap silicone couplers will blow like that under higher pressures. not familiar with what kind of couplers they are using in that kit. Take a look at the ends of the coupler and see how many layers there are.
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07-06-2015, 02:15 PM	#3
jazredgt Estoril Tings 80 Rep 441 Posts Drives: 2020 X3M 2018 X3 M40i Join Date: Jan 2013 Location: Jacksonville, FL iTrader: (0) Garage List 2020 BMW [0.00] 2018 BMW X3 M40i [0.00]	Stock blow off diverters or aftermarket blow off valve? Did you accidently forget to hook the vac line back to the BOV's? That would cause no where for the air to go except kaboom hose or couplers. Eventually kaboom turbo too. __________________ 2018 X3 m40i - MHD Stg 1 2020 X3M - Stock
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07-06-2015, 06:46 PM	#4
Tiago@VRSF 2108 Rep 43,350 Posts Drives: F90 M5 Join Date: Dec 2007 Location: Doral, FL iTrader: (99) Garage List 2014 F30 328xi [0.00] 2015 F82 BMW M4 [0.00] 2013 Ducati 1199 Pa ... [0.00] 2008 BMW 335i [0.00]	Poor quality silicone couplers, clamps or improperly beaded tubing/piping will cause continuous blow off issues.
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07-06-2015, 06:49 PM	#5
tc535i Lieutenant Colonel 222 Rep 1,818 Posts Drives: 2007 335i, 2001 330i, 1995 M3 Join Date: Sep 2013 Location: West Los Angeles iTrader: (1)	blew into pieces? or just blew off the car? what boost are you seeing at "stg 2+"?
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07-06-2015, 09:22 PM	#6
Mike@N54Tuning.com Joint Chiefs of Staff 5044 Rep 116,174 Posts Drives: 2007 335i, 2015 M3 Join Date: Dec 2008 Location: N54tuning.com iTrader: (89)	What kind of clamps are you using? Mike
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07-07-2015, 11:17 PM	#7
F80Mmm Private First Class 73 Rep 191 Posts Drives: 18 F80 M3 ZCP, 09 E90 335i 6MT Join Date: Jan 2013 Location: Mountain View, CA iTrader: (3)	plastic hose? hmmm T-Bolt clamps are a man's best friend +1 VRSF downpipes + intercooler __________________ 2009 BMW 335i 6MT/MHD Wedge Custom E60/VTT Inlets/VRSF DP's/VRSF 7" HD FMIC/Boost Concepts FPM-1 E85 Fuel Pump/BMS DCI/BMW PE/ER CP/Tial BOV/BMS OCC/RB PCV/19" Gunmetal Forgestar F14's Deep Concave/Michelin PS4S/Ohlins R&T Coilovers/Swift Springs/Spec Stg 2+/Icon Motorsports M3 Rep Front Bumper
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07-11-2015, 12:21 PM	#8
badh3ro Enlisted Member 9 Rep 43 Posts Drives: f32 430d Join Date: Apr 2014 Location: Valencia iTrader: (0)	I am sorry for such a late reply, was very beasy lately. It was just poor quality hoses, I bought some reinforced ones and WOT my car at least 10 times now in 2-3-4 gear's and didn't had any problems (stock tune tho, don't want to risk with cobb yet as I have to drive around 1500 miles tomorrow). I had normal plastic\rubber hoses, with apperently couldn't hold the pressure of big intercooler.
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