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Old 05-13-2009, 04:36 AM   #1
mxpro252
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Default Driving without hoodscoop bad for turbo?

Is there any danger in driving my 07 wrx for a few days without the hoodscoop and just having the open hole in the hood?
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Old 05-13-2009, 04:51 AM   #2
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If you stay out of boost you'll be fine.
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Old 05-13-2009, 05:07 AM   #3
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You'll prob heat soak.. but like nsfw if you're not racing you should be fine.
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Old 05-13-2009, 05:53 AM   #4
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Well if you think about the function of the hood scoop and the splitter is to bring air into your intercooler and onto your turbo. If you remove that factor your going to have A MAJOR less cooling efficiency. SO like everyone else said. Just drive normal and don't be jetting around anywhere.

So yea, just stay out of boost. Why are you taking it off for a couple days anyways?
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Old 05-13-2009, 11:25 AM   #5
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Quote:
Originally Posted by fearmywrx View Post
Well if you think about the function of the hood scoop and the splitter is to bring air into your intercooler and onto your turbo. If you remove that factor your going to have A MAJOR less cooling efficiency. SO like everyone else said. Just drive normal and don't be jetting around anywhere.

So yea, just stay out of boost. Why are you taking it off for a couple days anyways?
^^What he said, but I'd like to add on that what will happen is that your car will pull timing due to the warmer IAT. It'll be almost as if you were running no intercooler at all.
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Old 05-13-2009, 11:51 AM   #6
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^^What he said, but I'd like to add on that what will happen is that your car will pull timing due to the warmer IAT. It'll be almost as if you were running no intercooler at all.
IAT is measured at the MAF, before the intercooler. Not passing air over the intercooler will have zero effect on measured IAT. It will raise actual IAT, but the ECU doesn't know that, so if you get on it you might start knocking. That said, do as everyone else has said and stay out of boost.
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Old 05-13-2009, 12:07 PM   #7
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Well said ^^^
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Old 05-13-2009, 01:50 PM   #8
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So I know I have gotten into boost so next question would be how would I know if anything has been damaged?
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Old 05-13-2009, 01:52 PM   #9
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compression and leakdown test
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Old 05-13-2009, 02:09 PM   #10
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Im sure it will be fine.
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Old 05-13-2009, 02:24 PM   #11
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If it runs and sounds the same its prob fine, justg do what everybody is saying and put the bitch back on.
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Old 05-13-2009, 03:00 PM   #12
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Ya ill have my new scoop on tomorrow. It's not off cause I think it looks cool, it was in an accident
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Old 05-13-2009, 03:16 PM   #13
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Quote:
Originally Posted by the suicidal eggroll View Post
IAT is measured at the MAF, before the intercooler. Not passing air over the intercooler will have zero effect on measured IAT. It will raise actual IAT, but the ECU doesn't know that, so if you get on it you might start knocking. That said, do as everyone else has said and stay out of boost.
That's what I meant. Sorry, yes, the timing will be pulled because of the knocking, not because the car reads the higher IAT.
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Old 05-13-2009, 03:40 PM   #14
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It's not off cause I think it looks cool, it was in an accident



Catch a bird? Almost pulled that off in my 05... I miss my 05
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Old 05-13-2009, 05:56 PM   #15
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^^ HAHA that’s what i was thinking, man with sti scoops the bird would just get stuck on the top mount. Imagine that you open your hood and there is a bird dead on your top mount.
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Old 05-13-2009, 09:15 PM   #16
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Thanks for the responses. This is my first turbo'd car so I'm kinda clueless. But I'm also an over thinker too so a leak down and compression test is the only way to find out if somethings wrong? It still runs fine and sounds fine but I worry a lot
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Old 05-13-2009, 10:15 PM   #17
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even if you were pinging with the warmer less dense combustion chamber air, the knock sensor should prevent any damage from occuring. Feel any timing pull?
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Old 05-13-2009, 10:52 PM   #18
mxpro252
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What's timing pull? Or heat soak?
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Old 05-14-2009, 01:58 AM   #19
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What's timing pull? Or heat soak?
heat soak is exactly what it sounds like. The intercooler is just sittin there absorbing heat from the engine without the air from the hood scoop to cool it down.

Timing pull means your ecu retarding ignition timing. simply put, retarded timing=slower acceleration. Feel any difference in acceleration compared to before?
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Old 05-14-2009, 11:12 AM   #20
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I haven't driven it much so its hard to tell if it's slowed down. It still feels quick, if the timing has changed Its not real noticable. Everything sounds and feels fine to me but I can't tell if something might be off a little. That's why I was looking for a way to test it and eliminate the possiblity of something being wrong.
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Old 05-14-2009, 11:36 AM   #21
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even if you were pinging with the warmer less dense combustion chamber air, the knock sensor should prevent any damage from occuring. Feel any timing pull?
If that were the case, nobody would blow motors due to detonation, but they do. The knock sensor isn't perfect, and isn't even used above 6k RPM or so (due to noise).

Chances are the engine is fine though, in order for a day's worth of detonation to kill the motor, it has to be pretty bad, like audible bad.
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Old 05-14-2009, 02:18 PM   #22
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Quote:
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...in order for a day's worth of detonation to kill the motor, it has to be pretty bad, like audible bad.
Are you sure about that?
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Old 05-14-2009, 03:55 PM   #23
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and just something i was thinking about, the car is pretty much stock, so if it can still get up to 60mph in 6 seconds everything is probably how it should be right?
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Old 05-14-2009, 10:48 PM   #24
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Are you sure about that?
haha that is a debate all in itself..

I've been in a Dakota 5.9L R/T that detonated everytime the gas pedal was looked at day in/day out and never lost compression..

Then again guys loose rings/lands from 1 non-audible det..

I honestly think its the luck of the draw/knock... 1 bad/bad knock could do a piston or bearing in... Or it might last months with them poor little bb's bouncing around in that tin can

-Jerod
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Old 05-14-2009, 11:52 PM   #25
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The worlds going to end
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