If it's been modified ......
They are "De-tuned" by the manufacturers. A re-map gives them what they were designed to have, power wise.
14 February 2011, 06:18 PM
#32
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If you are scared of revving it then get a diesel or low revving V8!
14 February 2011, 09:02 PM
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14 February 2011, 09:05 PM
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15 February 2011, 09:04 AM
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Have you had much technical and mechanical experience?
Les
15 February 2011, 09:18 AM
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15 February 2011, 10:10 AM
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You just don't understand what I was saying. Try reading my post again. Do you rev your engine up to the point where it wont rev any higher or do you change up at the point where the engine will be at the best speed to pull best in the next gear in order to maintain the overall acceleration performance? Taking the engine up to valve bounce or where it runs out of further power means that the pressure in the cylinders decreases and the reciprocating forces are at their highest with little cushioning effect. Good way to knacker your engine as quickly as possible for a lesser overall performance anyway.
Have you had much technical and mechanical experience?
Les
Have you had much technical and mechanical experience?
Les
If you want the fastest time down the 1/4 you need to take it up to almost redline between shifts. It's the only way especially on a turbo.
15 February 2011, 10:38 AM
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I've spoken to a couple of tuners and had the same answer about the rev limiter. If you let the impreza hit the limiter you run the risk of the cambelt jumping, snapping or buffeting the timing up due to the 'bouncing' which occurs when you hit the redline.
It depends on what standard turbo you have also with regards to shift changes. A td04 on a standard uk classic will run out of puff before the redline but hits boost early so you would naturally change gear at the peak power, no?
Obviously this is different for each turbocharged car as they are all set up differently.
Last edited by chocolate_o_brian; 15 February 2011 at 10:39 AM.
15 February 2011, 12:07 PM
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Disagree Tony
I've spoken to a couple of tuners and had the same answer about the rev limiter. If you let the impreza hit the limiter you run the risk of the cambelt jumping, snapping or buffeting the timing up due to the 'bouncing' which occurs when you hit the redline.
It depends on what standard turbo you have also with regards to shift changes. A td04 on a standard uk classic will run out of puff before the redline but hits boost early so you would naturally change gear at the peak power, no?
Obviously this is different for each turbocharged car as they are all set up differently.
I've spoken to a couple of tuners and had the same answer about the rev limiter. If you let the impreza hit the limiter you run the risk of the cambelt jumping, snapping or buffeting the timing up due to the 'bouncing' which occurs when you hit the redline.
It depends on what standard turbo you have also with regards to shift changes. A td04 on a standard uk classic will run out of puff before the redline but hits boost early so you would naturally change gear at the peak power, no?
Obviously this is different for each turbocharged car as they are all set up differently.
If you change gear at peak power you drop down way below it because of the gear ratio change. That is why you change at near redline. At redline power may be tailing off but as the next ratio engages you are closer to peak power again; you keep the peak power nicely between your shifts if you like and that gives you better average power for the duration of any given gear.
Plus with turbos, especially tuned cars with big turbos, they can be very 'peaky' and you might only have full boost over the last 2 or 3k.
15 February 2011, 12:37 PM
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Disagree Tony
I've spoken to a couple of tuners and had the same answer about the rev limiter. If you let the impreza hit the limiter you run the risk of the cambelt jumping, snapping or buffeting the timing up due to the 'bouncing' which occurs when you hit the redline.
It depends on what standard turbo you have also with regards to shift changes. A td04 on a standard uk classic will run out of puff before the redline but hits boost early so you would naturally change gear at the peak power, no?
Obviously this is different for each turbocharged car as they are all set up differently.
I've spoken to a couple of tuners and had the same answer about the rev limiter. If you let the impreza hit the limiter you run the risk of the cambelt jumping, snapping or buffeting the timing up due to the 'bouncing' which occurs when you hit the redline.
It depends on what standard turbo you have also with regards to shift changes. A td04 on a standard uk classic will run out of puff before the redline but hits boost early so you would naturally change gear at the peak power, no?
Obviously this is different for each turbocharged car as they are all set up differently.
If you change gear at peak power you drop down way below it because of the gear ratio change. That is why you change at near redline. At redline power may be tailing off but as the next ratio engages you are closer to peak power again; you keep the peak power nicely between your shifts if you like and that gives you better average power for the duration of any given gear.
Plus with turbos, especially tuned cars with big turbos, they can be very 'peaky' and you might only have full boost over the last 2 or 3k.
15 February 2011, 12:49 PM
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Thats a bite!
Am all for modifying, gives people a chance to personalise otherwise we'd all be the same.
Am all for modifying, gives people a chance to personalise otherwise we'd all be the same.
he is a trolling *** clown, ignore him.##
Why would you go on a modified car forum and say that if you werent craving for attention in your old folks home, instead of trolling us with sh1te, press the emergency button next to your bed, a nurse will show up sooner or later and give you drugs to keep you quiet, then you might stop posting blatant attempts to give yourself some attention, in other words, stop it pete, your getting really boring now, or has dementia set in and you dont remenber all the sh1te you post?
Why would you go on a modified car forum and say that if you werent craving for attention in your old folks home, instead of trolling us with sh1te, press the emergency button next to your bed, a nurse will show up sooner or later and give you drugs to keep you quiet, then you might stop posting blatant attempts to give yourself some attention, in other words, stop it pete, your getting really boring now, or has dementia set in and you dont remenber all the sh1te you post?
15 February 2011, 12:58 PM
#49
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Disagree Tony
I've spoken to a couple of tuners and had the same answer about the rev limiter. If you let the impreza hit the limiter you run the risk of the cambelt jumping, snapping or buffeting the timing up due to the 'bouncing' which occurs when you hit the redline.
It depends on what standard turbo you have also with regards to shift changes. A td04 on a standard uk classic will run out of puff before the redline but hits boost early so you would naturally change gear at the peak power, no?
Obviously this is different for each turbocharged car as they are all set up differently.
I've spoken to a couple of tuners and had the same answer about the rev limiter. If you let the impreza hit the limiter you run the risk of the cambelt jumping, snapping or buffeting the timing up due to the 'bouncing' which occurs when you hit the redline.
It depends on what standard turbo you have also with regards to shift changes. A td04 on a standard uk classic will run out of puff before the redline but hits boost early so you would naturally change gear at the peak power, no?
Obviously this is different for each turbocharged car as they are all set up differently.
If you change gear at peak power you drop down way below it because of the gear ratio change. That is why you change at near redline. At redline power may be tailing off but as the next ratio engages you are closer to peak power again; you keep the peak power nicely bracketed between your shifts if you like and that gives you better average power for the duration of any given gear. You are maximising the area below the power curve.
Plus with turbos, especially tuned cars with big turbos, they can be very 'peaky' and you might only have full boost over the last 2 or 3k.
15 February 2011, 09:02 PM
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That is why I said 'almost' redline.
If you change gear at peak power you drop down way below it because of the gear ratio change. That is why you change at near redline. At redline power may be tailing off but as the next ratio engages you are closer to peak power again; you keep the peak power nicely bracketed between your shifts if you like and that gives you better average power for the duration of any given gear. You are maximising the area below the power curve.
Plus with turbos, especially tuned cars with big turbos, they can be very 'peaky' and you might only have full boost over the last 2 or 3k.
If you change gear at peak power you drop down way below it because of the gear ratio change. That is why you change at near redline. At redline power may be tailing off but as the next ratio engages you are closer to peak power again; you keep the peak power nicely bracketed between your shifts if you like and that gives you better average power for the duration of any given gear. You are maximising the area below the power curve.
Plus with turbos, especially tuned cars with big turbos, they can be very 'peaky' and you might only have full boost over the last 2 or 3k.
Is there an echo in here
I was referring to standard cars not modded ones.
But we'll agree to disagree then
16 February 2011, 02:18 PM
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Thanks 5t.
As usual TDW never seems to undertand other peoples' posts.
Relying on the the rev limiter is a silly thing to do for the reasons quoted above.
Very often going any distance past peak power in the rev band is not an advantage anyway if you are looking for best overall performance. The power available drops off significantly at the higher revs up to the red line and as turbos develop so much more torque than a normally aspirated engine at the lower revs, then often you will actually achieve a better overall time to the max speed you wish to attain by changing up a bit earlier and using that torque up to the peak power rev figure and not so far above it as the redline figure.
That will also preserve your engine better as I said in my earlier post. It is what I meant by not thrashing the engine.
I used to do that with my racer too and the car's performance was every bit as good or better than redlining the engine. I had other high performance cars close up to compare my car's performance with.
Les
As usual TDW never seems to undertand other peoples' posts.
Relying on the the rev limiter is a silly thing to do for the reasons quoted above.
Very often going any distance past peak power in the rev band is not an advantage anyway if you are looking for best overall performance. The power available drops off significantly at the higher revs up to the red line and as turbos develop so much more torque than a normally aspirated engine at the lower revs, then often you will actually achieve a better overall time to the max speed you wish to attain by changing up a bit earlier and using that torque up to the peak power rev figure and not so far above it as the redline figure.
That will also preserve your engine better as I said in my earlier post. It is what I meant by not thrashing the engine.
I used to do that with my racer too and the car's performance was every bit as good or better than redlining the engine. I had other high performance cars close up to compare my car's performance with.
Les
16 February 2011, 02:30 PM
#53
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Thanks 5t.
As usual TDW never seems to undertand other peoples' posts.
Relying on the the rev limiter is a silly thing to do for the reasons quoted above.
Very often going any distance past peak power in the rev band is not an advantage anyway if you are looking for best overall performance. The power available drops off significantly at the higher revs up to the red line and as turbos develop so much more torque than a normally aspirated engine at the lower revs, then often you will actually achieve a better overall time to the max speed you wish to attain by changing up a bit earlier and using that torque up to the peak power rev figure and not so far above it as the redline figure.
That will also preserve your engine better as I said in my earlier post. It is what I meant by not thrashing the engine.
I used to do that with my racer too and the car's performance was every bit as good or better than redlining the engine. I had other high performance cars close up to compare my car's performance with.
Les
As usual TDW never seems to undertand other peoples' posts.
Relying on the the rev limiter is a silly thing to do for the reasons quoted above.
Very often going any distance past peak power in the rev band is not an advantage anyway if you are looking for best overall performance. The power available drops off significantly at the higher revs up to the red line and as turbos develop so much more torque than a normally aspirated engine at the lower revs, then often you will actually achieve a better overall time to the max speed you wish to attain by changing up a bit earlier and using that torque up to the peak power rev figure and not so far above it as the redline figure.
That will also preserve your engine better as I said in my earlier post. It is what I meant by not thrashing the engine.
I used to do that with my racer too and the car's performance was every bit as good or better than redlining the engine. I had other high performance cars close up to compare my car's performance with.
Les
That is why doing a fast 1/4 takes skill in a manual.
You need to get close to reline then shift to get a good time.
You try shifting at 5 grand and I'll shift at 7.5 grand and we'll see who wins.
16 February 2011, 03:06 PM
#54
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You were the one to bring up the rev limiter in the first place and also to say that the engine is protected by it and all you need to do is to keep changing the oil and it wont suffer.
Why are you saying that I would be changing up at 5K when I never mentioned a figure?
You have to know all the facts, not just guess at it.
Les
16 February 2011, 08:54 PM
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