sohc vtec
Honda-Tech Member
Joined: Jan 2006
Posts: 10,443
Likes: 2
From: Rochester, New York -> Santa Clara, CA
Re: sohc vtec (THC07)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ser13 »</TD></TR><TR><TD CLASS="quote">whats the safest rpm to drop a 1.6 sohc vtec stock but dc headers i switch gear at about 4,000 rpm and it drops to 2,500rpm is that good</TD></TR></TABLE>
Safest RPM drop?
It shouldn't matter if you shift at 7k everytime, it's the same ammount of "drop" each time. Yeah 7k will put more stress on the motor, but regardless of how you slice it, you're still going from 1st (3.25) to 2nd (1.9) with an FD of 4.25 - those numbers are static, they NEVER change, therefore the drop is the same, everytime, there's no "better drop" or "worse drop" in RPM's. What there is though is what RPM's are better for your engine. From my experience D16Z6's and D16Y8's seem to work well over 2.5k. I wouldn't shift at 2k b/c that's just too low. You can on most cars...but most cars have more displacement than a civic, which increases torque, therefore enables you to shift lower.
You said you shift at 4k - that's perfect.
When I'm not beating on my car/winding it out/etc (driving normally). I shift at 4.5k RPM's (I like to shift before VTEC but the stock tach isn't 100% accurate).
With that said, the way you shift now (at 4k) is fine, as long as it's over 3.5 or so your RPM's won't be too low - you strain the engine if your RPMs are too low so lower isn't always better.
at THC07:
Kalin...you can run totally different shift patterns b/c you're running a 2.2L engine :-\ - the 1.6L has a lot less tq. due to its displacement, therefore cannot afford to shift at low as an h22 can...but know this...
Modified by Syndacate at 10:35 PM 11/25/2006
Safest RPM drop?
It shouldn't matter if you shift at 7k everytime, it's the same ammount of "drop" each time. Yeah 7k will put more stress on the motor, but regardless of how you slice it, you're still going from 1st (3.25) to 2nd (1.9) with an FD of 4.25 - those numbers are static, they NEVER change, therefore the drop is the same, everytime, there's no "better drop" or "worse drop" in RPM's. What there is though is what RPM's are better for your engine. From my experience D16Z6's and D16Y8's seem to work well over 2.5k. I wouldn't shift at 2k b/c that's just too low. You can on most cars...but most cars have more displacement than a civic, which increases torque, therefore enables you to shift lower.
You said you shift at 4k - that's perfect.
When I'm not beating on my car/winding it out/etc (driving normally). I shift at 4.5k RPM's (I like to shift before VTEC but the stock tach isn't 100% accurate).
With that said, the way you shift now (at 4k) is fine, as long as it's over 3.5 or so your RPM's won't be too low - you strain the engine if your RPMs are too low so lower isn't always better.
at THC07:
Kalin...you can run totally different shift patterns b/c you're running a 2.2L engine :-\ - the 1.6L has a lot less tq. due to its displacement, therefore cannot afford to shift at low as an h22 can...but know this...
Modified by Syndacate at 10:35 PM 11/25/2006
Honda-Tech Member
Joined: Jan 2006
Posts: 10,443
Likes: 2
From: Rochester, New York -> Santa Clara, CA
Re: sohc vtec (streettuned)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by streettuned »</TD></TR><TR><TD CLASS="quote">On crappy tires i drop at 3000 and shift at 7000. My car breaths pretty good with cheap boltons.</TD></TR></TABLE>
Shifting at 7k on a daily basis isn't in any way, shape, or form healthy for your car. ..And you only do this with crappy tires?
LoL
Ur messed up in the head bro...
Shifting at 7k on a daily basis isn't in any way, shape, or form healthy for your car. ..And you only do this with crappy tires?
LoL
Ur messed up in the head bro...
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