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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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10-17-2008, 11:47 PM
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#1 | | Wunder? Wonder?? Wander???
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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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KA-t 13psi daily
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10-18-2008, 12:18 AM
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#2 | | Head Moderator
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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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10-18-2008, 10:02 AM
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#3 | | Banned (ABWS)
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Check all the clamps on the charge pipes & connections,sounds like a boost leak.
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10-18-2008, 11:04 AM
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#4 | | Wunder? Wonder?? Wander???
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i'll buy some brake clean and check for leaks then.
thanks
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KA-t 13psi daily
S10 v8 project
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10-20-2008, 07:22 PM
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#5 | | Wunder? Wonder?? Wander???
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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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KA-t 13psi daily
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10-21-2008, 09:06 AM
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#6 | | RS.net, where our google ads make absolutely no sense!
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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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10-21-2008, 04:35 PM
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#7 | | Wunder? Wonder?? Wander???
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| Quote:
Originally Posted by ncrx  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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KA-t 13psi daily
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10-21-2008, 05:30 PM
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#8 | | Head Moderator
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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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10-21-2008, 08:34 PM
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#9 | | RS.net, where our google ads make absolutely no sense!
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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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10-21-2008, 10:07 PM
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#10 | | Head Moderator
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Originally Posted by ncrx 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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10-21-2008, 10:22 PM
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#11 | | OMGWTFBBQ is a common word I say everyday
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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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10-21-2008, 11:53 PM
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#12 | | RS.net, where our google ads make absolutely no sense!
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Originally Posted by Lomac Or even running too rich and blowing out the spark... | yes very possible. what car is this for neways?
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10-22-2008, 01:08 AM
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#13 | | Wunder? Wonder?? Wander???
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90 240sx turbo ka
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KA-t 13psi daily
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10-22-2008, 07:05 AM
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#14 | | RS.net, where our google ads make absolutely no sense!
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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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10-22-2008, 12:52 PM
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#15 | | Wunder? Wonder?? Wander???
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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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KA-t 13psi daily
S10 v8 project
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10-22-2008, 05:45 PM
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#17 | | Head Moderator
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Originally Posted by ncrx 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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10-22-2008, 07:06 PM
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#18 | | RS.net, where our google ads make absolutely no sense!
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Originally Posted by Lomac 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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10-22-2008, 09:36 PM
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#19 | | Head Moderator
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Originally Posted by ncrx 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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03-15-2009, 01:51 PM
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#20 | | Everyone wants a piece of R S...
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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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04-02-2009, 06:10 AM
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#21 | | NOOB, Not Quite a Regular!
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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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04-24-2009, 12:27 AM
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#22 | | RS.net, where our google ads make absolutely no sense!
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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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