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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 10-06-2008, 02:30 AM   #1
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Over rev.....ouch!

Hi guys, was racing my friend in his BMW 330, changed to 3rd gear, thought i was in gear but wasnt. I flattened the accelerator pedal and once i had realised that i wasnt in gear, the revs were already at the end of the dial and the car made a bit of a weird sound. I slowed down and it was idleing very roughly and the car was shaking. I drove to my house really slowly in 1st about 1km away. Was pissed off so i locked the car and went inside. The next morn i checked for boost pipe leaks, oil leaks and found nothing. Started it up, still idleing roughly shaking and sounds like its not firing on all cylinders. Got all upset again and went inside. This morning i started it up, still idleing roughly but not too badly. Drove it to work and by the time i got here it was back to normal, boosting normally and all good. How weird. Was it a limp mode perhaps or what?
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Old 10-06-2008, 05:48 AM   #2
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Most of the time when this happens that valves float and the pistons put a nice kink in the valve stem bending them all making the car run like crap or not run at all afterwards.

I would say count your blessings because it sounds like the car made it by without killing it's self.
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Old 10-06-2008, 05:53 AM   #3
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dont stray too far from home. there may be a fractured part in there that isnt quite failed yet. but push it and its bound to fail.
had this happen in a peugeot 405 a long time ago. it ended up being a failure in the head. so long ago i dont even remember the cause anymore.
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Old 10-06-2008, 06:54 AM   #4
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Look at the plugs. Any extra blowby or oil consumption? Stock pistons don't like being accelerated that fast.

I regularly take my Vig on stock and big cam valve-train to 7200 so it is unlikely that you got it to rev that tight unless in wrong gear. Couple weekends ago saw a drag car 9k in 3rd got to second.. It ruined everything.
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Old 10-06-2008, 07:07 AM   #5
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Originally Posted by GenuineSaab View Post
Look at the plugs. Any extra blowby or oil consumption? Stock pistons don't like being accelerated that fast.

I regularly take my Vig on stock and big cam valve-train to 7200 so it is unlikely that you got it to rev that tight unless in wrong gear. Couple weekends ago saw a drag car 9k in 3rd got to second.. It ruined everything.
Thanks. Going to check the plugs this eve. Think i might just replace them anyway. The car really does seem 100 percent. Thought i had bent a conrod. If i did damage valves, pistons or head then surely it would not suddenly be 100 percent? I thought maybe that by revving it high it over fueled which caused the irratic idleing?
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Old 10-06-2008, 07:12 AM   #6
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Originally Posted by GenuineSaab View Post
Look at the plugs. Any extra blowby or oil consumption? Stock pistons don't like being accelerated that fast.

I regularly take my Vig on stock and big cam valve-train to 7200 so it is unlikely that you got it to rev that tight unless in wrong gear. Couple weekends ago saw a drag car 9k in 3rd got to second.. It ruined everything.
Was in neutral, but thought that i had engaged 3rd, so i only revved it to the max for a split second or so. Why no rev limiter, or do u have to be in gear?
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Old 10-06-2008, 07:15 AM   #7
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pretty sure there is a rev. limiter at 6200...
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Old 10-06-2008, 07:21 AM   #8
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Quote:
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pretty sure there is a rev. limiter at 6200...
But you can still over rev if your in the wrong gear
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Old 10-06-2008, 07:22 AM   #9
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But you can still over rev if your in the wrong gear
but it kind of hard to do in neutral.
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Old 10-06-2008, 07:27 AM   #10
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but it kind of hard to do in neutral.
true
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Old 10-06-2008, 09:16 AM   #11
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I would do as Nick suggest, check each plug, keep track of what hole they came out of and see if one is really wet or anything. Put in a new set of plugs and re-set the ecu and see how it does.

Reading the plugs should tell you some information if there is a problem with one of the cylinders,

good luck,

John
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Old 10-06-2008, 10:53 AM   #12
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I would do as Nick suggest, check each plug, keep track of what hole they came out of and see if one is really wet or anything. Put in a new set of plugs and re-set the ecu and see how it does.

Reading the plugs should tell you some information if there is a problem with one of the cylinders,

good luck,

John
Thanks i will do that. So good to have all your input. The agents here in S A are really clueless, and there are no tuners who know SAABs.
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Old 10-06-2008, 03:32 PM   #13
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As stated before in the thread, if this happened in neutral like he said, the motor should have just bounced of the rev limiter. Can't hurt to check the things stated, but I think the car should be fine.
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Old 10-06-2008, 03:54 PM   #14
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I'd bounce my car off the rev limiter time and time again at autocrosses, as other have said, the rev limit is there, and the only way to exceed it really should be from downshifting instead of upshifting. A no-load trip up to 6500rpm or so should not destroy anything.
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Old 10-06-2008, 04:00 PM   #15
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haha any of you remember Jak Stoll at the Carlisle Show in '06, he was bouncing his car of the limiter non stop.
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Old 10-06-2008, 04:15 PM   #16
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If you pull the plugs and can rotate the engine through, you can look through the spark plug holes with a small flashlight and see the tops of the pistons, this way you could check to see if the valves hit them.
Also, you could do a compression check to see if you have a bent valve (will not seat correctly, therefore low compression).
lastly, you could check to make sure your timing chain did not jump a tooth. This can sometimes happens, especially if components are worn, and will make the car run funny, idle erratic, run hot, etc.. Line up all the timing marks and check.
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Old 10-07-2008, 03:26 AM   #17
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If you pull the plugs and can rotate the engine through, you can look through the spark plug holes with a small flashlight and see the tops of the pistons, this way you could check to see if the valves hit them.
Also, you could do a compression check to see if you have a bent valve (will not seat correctly, therefore low compression).
lastly, you could check to make sure your timing chain did not jump a tooth. This can sometimes happens, especially if components are worn, and will make the car run funny, idle erratic, run hot, etc.. Line up all the timing marks and check.
Thanks i will check all those things. Was also thinking that maybe it was the wastegate that got stuck open!
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Old 10-07-2008, 03:35 AM   #18
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I would do as Nick suggest, check each plug, keep track of what hole they came out of and see if one is really wet or anything. Put in a new set of plugs and re-set the ecu and see how it does.

Reading the plugs should tell you some information if there is a problem with one of the cylinders,

good luck,

John
I know in another thread u mentioned that bcpr8es are better than bcpr7es plugs. Which do u recommend i use? The daytime temps here in S A are very high.
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Old 10-07-2008, 06:49 AM   #19
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You should run the BCPR7ES.

Since you are in the heat a larger intercooler will make it much happier..
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Old 10-07-2008, 07:22 AM   #20
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haha any of you remember Jak Stoll at the Carlisle Show in '06, he was bouncing his car of the limiter non stop.

"I'll show you a 7k redline..." BRAAAPPP BRAPPPP BRAPPP

I think that's when he quit drinking.
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