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Go Back   REVscene Automotive Forum > Technical Discussion > Advanced Forced Induction & N/A Engine Tuning

Advanced Forced Induction & N/A Engine Tuning This forum is brought to you by Racing Greed in Port Coquitlam.
Supercharger vs Turbocharger vs NA? Hondata vs Megasquirt? 94oct vs 87oct? Through technical discussion, let's find out what will the best option for you...

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Old 10-17-2008, 11:47 PM   #1
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Need Boost help!!

On my way to K-town and my turbo starts acting up... when i start to hit boost around 5psi the turbo the bov shutters and kicks all my power out!!! WTF!!! so i basically had to stay out of boost the whole way to kelowna (110 is hella lame!!) so im trying to figure out whats going on.. boost creap?? mayb vaccume issues??? manifold leak? anything will help. thanks guy
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Old 10-18-2008, 12:18 AM   #2
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Did you play with the adjustment screw? Perhaps the BOV spring is starting to go?

Also, like you said, it could be a vac leak. Do you have a vac gauge (either separate or a dual boost/vac gauge) to check? You can also use something like Brake Clean and spray it around all of your vac lines to check for any air leaks.
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Old 10-18-2008, 10:02 AM   #3
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Check all the clamps on the charge pipes & connections,sounds like a boost leak.
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Old 10-18-2008, 11:04 AM   #4
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i'll buy some brake clean and check for leaks then.
thanks
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Old 10-20-2008, 07:22 PM   #5
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alright so on saturday checked for leaks... nothing... of course.. drove the car around on saturday and it drove fine... On the way home today turbo was good threw 1 2 3 gear but soon as i got into 4th gear and started hitting 5psi it kicks out.. mayb bov problems? i duno guys still throwing darts at the drawing board
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Old 10-21-2008, 09:06 AM   #6
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I'd check your plugs, possibly not cold enough or the tips are burnt out.
I'd also check your fuel pump / pressure.
Finally I'd check your injector duty cycle.
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Old 10-21-2008, 04:35 PM   #7
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I'd check your plugs, possibly not cold enough or the tips are burnt out.
I'd also check your fuel pump / pressure.
Finally I'd check your injector duty cycle.
Plugs are brand new.. Wat do you mean by cold enough.. i have been noticing the pump takes awhile to power up on start up.. how can i check my injector cycle... Rx-7 injectors( just so you know)
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Old 10-21-2008, 05:30 PM   #8
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Cold/Hot is often referred to when talking about the heat range of spark plugs. A colder plug is able to shrug off heat better than a hotter one, often allowing for better spark when the engine is running at a higher temperature.
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Old 10-21-2008, 08:34 PM   #9
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Have you had the a/f checked? I'm guessing you might be running lean and detting.
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Old 10-21-2008, 10:07 PM   #10
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Have you had the a/f checked? I'm guessing you might be running lean and detting.
Or even running too rich and blowing out the spark...
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Old 10-21-2008, 10:22 PM   #11
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i'm not sure if this is true, but if the waste gate is messed up or left open then your hot pipe isn't getting any air so the car isn't getting any power.

but then again it'd probably be quite loud.
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Old 10-21-2008, 11:53 PM   #12
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Or even running too rich and blowing out the spark...
yes very possible. what car is this for neways?
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Old 10-22-2008, 01:08 AM   #13
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90 240sx turbo ka
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Old 10-22-2008, 07:05 AM   #14
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I would consider getting a consult cable with nissan data scan software. should be like 100$ or so. google plms developments.

you can get a read out of all factory sensors, see what your injectory duty cycle is, see if the maf is maxed out etc.

also what heat range spark plug are you using? at the very minimum i would say you would need a 6, but might need a 7.

what are u using for fuel mgmt? safc? chip?
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Old 10-22-2008, 12:52 PM   #15
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Safc for my fuel management..

I'll check the heat on the plugs and im in the mits of reading threw plms developments looks like that might help me out.
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Old 10-22-2008, 01:53 PM   #16
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if you can get a cable cheaper locally

you can always get the freeware versions of software

http://300zx-twinturbo.com/conzult/downloads.htm

http://www.sr20forum.com/calumsult/1...nsult-faq.html

see post 3
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Old 10-22-2008, 05:45 PM   #17
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also what heat range spark plug are you using? at the very minimum i would say you would need a 6, but might need a 7.
Depends on what brand you use.... some brands change their rating up or down, depending on who it is.
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Old 10-22-2008, 07:06 PM   #18
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Depends on what brand you use.... some brands change their rating up or down, depending on who it is.
Ok i've only used ngk's all my life, so im talking in ngk speak. I can't vouce for any other..

I currently use bkre8ix's on my gti-r. I'm running 17psi and roughly 330ish hp.
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Old 10-22-2008, 09:36 PM   #19
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Ok i've only used ngk's all my life, so im talking in ngk speak. I can't vouce for any other..
I'm running one step colder Bosch Platinum+2's and I believe their rating system is the lower the number, the colder it is.

I just wanted to throw the rating system discrepancy out there, is all.
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Old 03-15-2009, 01:51 PM   #20
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Im going to have to say its possible your running lean. Perhaps the fuel pump is giving out, and cannot provide enough fuel at WOT thru 4th gear.

What is your wideband reading? What fuel pump are you running? SAFC is barely a tuning device, i use one, and in all honesty, there are MUCH better tuning devices out there.

What size injectors are you running? What FPR are you using? What fuel pump? Are you tuned strictly with the SAFC, or are you using a FMU(rising rate fpr)?
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Old 04-02-2009, 06:10 AM   #21
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ahh live and learn

three words SPARK PLUG GAP unless u have some supporting ignition mods i can tell you allready its too big try .25-35
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Old 04-24-2009, 12:27 AM   #22
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clutch maybe slipping? on my old turbo honda it did that on 4th gear at 5psi. Eventually 3rd gear and so on. or it could be plugs.
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