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Shift points and VTEC

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Old Aug 17, 2007 | 12:57 PM
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Default Shift points and VTEC

Still trying to figure out this close ratio six speed. I havent really got out and flogged it extensively yet, but the few times ive taken the car through the power band a couple gears...two things concerned me.
1. It seems the gear ratios and rev limiter leave me falling out of VTEC on the 1-2 shift. Roughly 5800 rpm it seems. Can anyone confirm this?
2. In an effort to prevent this i shifted as fast as possible and was met with the clutch turning gooey on me. Cars only got 26k on the odo, not to mention fairly light and void of torque, so i was dissapointed to say the least. Ill have to stick with smooth and brisk instead of violent and fast. Is there any way to increase clutch pressure on the stocker? I have no confidence in this clutch whatsoever. Especially with the higher rpm's this little four runs and the fact that i will be road coarsing it.

the whole vtec at 6000rpm thing is mind boggling to me. Especially in first gear city driving. Its seems nothing more than a receipe for a fried clutch. Im trying to merge and im like "cmon...cmon...FINALLY" Give me some grunt at 4500rpm at least. Im sure theres ecu mods that would address this but im sure my dealer would love to throw away my warranty if i did that. Im gonna talk to my dealer about it.

Sigh* This car is like a nfl half back with ADD. Once you wake it up its outstanding.
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Old Aug 17, 2007 | 01:11 PM
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you have an AP2 (2004+ s2000) which comes with a clutch delay valve (CDV) which is why your clutch is turning gooey and slowing your shifts. you're going to have to remove the CDV to get rid of this issue
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Old Aug 17, 2007 | 01:11 PM
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here's a diy removal

https://www.s2ki.com/forums/index.php?showtopic=282205
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Old Aug 17, 2007 | 01:12 PM
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Originally Posted by wanabmmaboy,Aug 17 2007, 01:57 PM
1. It seems the gear ratios and rev limiter leave me falling out of VTEC on the 1-2 shift.
Yup -- on the F22C that's correct. But you have that extra displacement to make up for it.

Do not "shift as fast as possible". You're going to (at best) ruin the synchros or (at worst) misshift and blow up your engine at the same time as you lock up the rear wheels and slide off the road.

We're talking upshifts here, and you want to time the shifts such that the engine slows down during the shifting process to just the right speed for meshing in with the new gear. This does not happen slowly, but it doesn't happen instantaneously either.

(As for the CDV -- my car doesn't have one so luckily I don't have to worry about that.)

You will either get the hang of driving the car at high RPMs or you won't. But there's no way to magically make a small, high-rpm engine have power at low rpms. (OK, there is one way -- turbocharge it).
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Old Aug 17, 2007 | 01:43 PM
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It can be done! I don't always punch it, but every now and then I'll do some pulls through the first 4 gears. If you can manage to shift just before rev limiter, you should still be in the v-tec cycle.
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Old Aug 17, 2007 | 02:36 PM
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Hmmmm... Sounds like you just bought the car and were expecting to engage in some red light to red light tire smoaking street drag racing. If so, you will be very disappointed. You need to get a big displacement muscle car for that (in the past, I've had cars with up to 440 cu in displacement). You should have driven it before the purchase. Below are some examples of what the car does well (there is one "red light" type video that might be what you are looking for). The euro guys don't have cheap gas and muscle cars, so they learn how to drive.

http://youtube.com/watch?v=nfG1Pq0hAmY 269
http://youtube.com/watch?v=ihtrrcgoVj4 Ferrari
http://youtube.com/watch?v=psj872-lTUA lotus
http://youtube.com/watch?v=fdfODwFQ6vE Nurburgring
http://youtube.com/watch?v=xPk3tbsw5-w phone
http://youtube.com/watch?v=0TQ5jGiiMlI


http://youtube.com/watch?v=gTkZ40Ycdzw exhaust 9000
http://youtube.com/watch?v=MD0SkzD7Ymg exhaust wind
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Old Aug 17, 2007 | 06:34 PM
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Why did they not just lower the vtec switch over point to 5000, to keep the same power band?
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Old Aug 17, 2007 | 06:51 PM
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Originally Posted by overst33r,Aug 17 2007, 07:34 PM
Why did they not just lower the vtec switch over point to 5000, to keep the same power band?
Why not just lower it to 100 RPM? If a little is good, then more must be better, right?

The VTEC cams come on when it is helpful to the engine to have them come on.
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Old Aug 17, 2007 | 07:52 PM
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Originally Posted by mikegarrison,Aug 17 2007, 06:51 PM
Why not just lower it to 100 RPM? If a little is good, then more must be better, right?

The VTEC cams come on when it is helpful to the engine to have them come on.
So a 3000rpm powerband is not anymore helpful than a 2000rpm powerband?
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Old Aug 17, 2007 | 08:29 PM
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Not if you're making less power in the first 1000rpm of that 3000rpm powerband. VTEC isn't just some magical thing where if you set it, that's where your power is.

Why don't we just have VTEC on all the time?
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