Went to Engine Cutout, ? Did I Hit Range 4-6
09-27-2015, 09:41 AM
#1
Three Wheelin'
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Went to Engine Cutout, ? Did I Hit Range 4-6
Background - Recently my TT 6M was in for service and major inspection. During the inspection my independent dealer found one of my two turbo actuators was stuck and I wasn't getting full boost. They fixed it and needless to say my TT performs a lot better with much quicker throttle response.
Yesterday - I over revved my TT in 3rd gear because 1) I wasn't paying attention to my tach and boost gauge, 2) I was surprised at how fast my TT accelerated after I fixed my actuator, 3) I was more concerned about the quick lane change I was making and, 4) I was (although most won't admit it) having fun and probably showing off. But, isn't that why we buy a TT?
Over Rev - Because I went to cutout (rev limiter), realized it and quickly shifted into 4th, did I set a DME code 4 or higher?
Yesterday - I over revved my TT in 3rd gear because 1) I wasn't paying attention to my tach and boost gauge, 2) I was surprised at how fast my TT accelerated after I fixed my actuator, 3) I was more concerned about the quick lane change I was making and, 4) I was (although most won't admit it) having fun and probably showing off. But, isn't that why we buy a TT?
Over Rev - Because I went to cutout (rev limiter), realized it and quickly shifted into 4th, did I set a DME code 4 or higher?
Last edited by 4ocious; 09-27-2015 at 12:27 PM.
09-27-2015, 09:49 AM
#2
Rocky Mountain High
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It's possible, although it may just be a stage 3 over rev. I've hit the limiter before and I have some stage 4 over revs on my DME. I've never had a mechanical over rev due to a missed downshift.
Don't worry about it.
Don't worry about it.
09-27-2015, 11:13 AM
#3
Rev Limiter, hitting it, usually happens in an upshift, is there to prevent the engine from going into the redline territory and since it didn't go pass the redline, it probably didn't hit anything pass range1-2
Over Revs, happens in a down shift and the engine is spinning so fast that rev limiter can't limit it and it almost always go pass the redline, how high, hard to say
Over Revs, happens in a down shift and the engine is spinning so fast that rev limiter can't limit it and it almost always go pass the redline, how high, hard to say
09-27-2015, 12:25 PM
#4
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Rev Limiter, hitting it, usually happens in an upshift, is there to prevent the engine from going into the redline territory and since it didn't go pass the redline, it probably didn't hit anything pass range1-2
Over Revs, happens in a down shift and the engine is spinning so fast that rev limiter can't limit it and it almost always go pass the redline, how high, hard to say
Over Revs, happens in a down shift and the engine is spinning so fast that rev limiter can't limit it and it almost always go pass the redline, how high, hard to say
09-27-2015, 01:15 PM
#6
I would say likely level 1 or maybe 2. Agree with a few others here. Unless you are hauling @ss and shift down into a very wrong gear, you are likely not going to get into the higher ranges.
Given how you described your actions, I bet you only have level 1, not even a two.
DC
Given how you described your actions, I bet you only have level 1, not even a two.
DC
09-27-2015, 02:46 PM
#7
Rocky Mountain High
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I understand that hitting the limiter will most certainly cause a stage 3 over rev and can cause a stage 4. Please correct me if my information is wrong.
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09-27-2015, 02:50 PM
#8
Rocky Mountain High
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Is this the correct range for the 997.1 TT?
Stage 1: 6800 - 7000
Stage 2: 7000 - 7200
Stage 3: 7200 - 7400
Stage 4: 7400 - 7900
Stage 5: 7900 - 9000
Stage 6: >9000
Stage 1: 6800 - 7000
Stage 2: 7000 - 7200
Stage 3: 7200 - 7400
Stage 4: 7400 - 7900
Stage 5: 7900 - 9000
Stage 6: >9000
09-27-2015, 02:57 PM
#9
Rennlist Member
Background - Recently my TT 6M was in for service and major inspection. During the inspection my independent dealer found one of my two turbo actuators was stuck and I wasn't getting full boost. They fixed it and needless to say my TT performs a lot better with much quicker throttle response.
Yesterday - I over revved my TT in 3rd gear because 1) I wasn't paying attention to my tach and boost gauge, 2) I was surprised at how fast my TT accelerated after I fixed my actuator, 3) I was more concerned about the quick lane change I was making and, 4) I was (although most won't admit it) having fun and probably showing off. But, isn't that why we buy a TT?
Over Rev - Because I went to cutout (rev limiter), realized it and quickly shifted into 4th, did I set a DME code 4 or higher?
Yesterday - I over revved my TT in 3rd gear because 1) I wasn't paying attention to my tach and boost gauge, 2) I was surprised at how fast my TT accelerated after I fixed my actuator, 3) I was more concerned about the quick lane change I was making and, 4) I was (although most won't admit it) having fun and probably showing off. But, isn't that why we buy a TT?
Over Rev - Because I went to cutout (rev limiter), realized it and quickly shifted into 4th, did I set a DME code 4 or higher?
09-27-2015, 03:32 PM
#10
Rocky Mountain High
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Good idea.
I checked mine and found that I did have a few stage 4 over revs since I purchased the car. I've hit the limiter, but I've never missed a downshift. That's why I made my comments.
I checked mine and found that I did have a few stage 4 over revs since I purchased the car. I've hit the limiter, but I've never missed a downshift. That's why I made my comments.
09-27-2015, 03:41 PM
#11
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As a general rule.. If you bounce the Rev limiter with a STOCK tune (stock limiter setting), you will trip Type 1 and most likely Type 2 OverRev's.. One can hit a Type 3 overRev shifting from 1st to 2nd IF you hit water or ice.. The fuel cut will NOT engine brake the rotating assy (crankshaft and 28.5 lb dual mass flywheel)..
It is almost impossible to hit a Type 4 or Type 5,6 on a STOCK tune when hitting the fuel cut limiter.
The classic Type 4 thru 6 OverRev's are recorded when you miss a shift>>5th into 2nd gear when you wanted 4th gear.. The worst is the upshift mistake of 4th into 5th but is forced into 3rd gear under full boost and engine load. The result is an engine RPM over 12000... The timing chains break, with the pistons collecting the exhaust valves... The dash lights up like a Xmas tree and you lose power with an engine shutdown..
It is almost impossible to hit a Type 4 or Type 5,6 on a STOCK tune when hitting the fuel cut limiter.
The classic Type 4 thru 6 OverRev's are recorded when you miss a shift>>5th into 2nd gear when you wanted 4th gear.. The worst is the upshift mistake of 4th into 5th but is forced into 3rd gear under full boost and engine load. The result is an engine RPM over 12000... The timing chains break, with the pistons collecting the exhaust valves... The dash lights up like a Xmas tree and you lose power with an engine shutdown..
09-27-2015, 03:58 PM
#12
09-27-2015, 11:44 PM
#15
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If you have recorded Type 4 OverRevs you either have a tuned ECU or your engine is operating over 7400 RPM's... Fuel cut is at 6750... You have to be going down the 1-70 done the mountain pass missing the shift point to hang the engine RPM... More often than not, a missed shifted occurred.
My main point is, most cars will not incur type 4 thru 6 OverRevs.. Mechanical forced RPM's usually is the root cause...
My main point is, most cars will not incur type 4 thru 6 OverRevs.. Mechanical forced RPM's usually is the root cause...