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Need Help Big Time !!! Geting Scared

 
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Old 01-04-2008, 01:05 AM
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Need Help Big Time !!! Geting Scared

ok so heres the low down .. i have a 94 honda prelude that HADa f22 non vtec engine and it blew so i did the h22 swap.. well i got the f22 tranny bolted to the h22 vtec motor.. and everyone is saying its slower and what not then i hear its better gearing and that im going to loose vtec and whatnot... please help

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Old 01-04-2008, 01:42 AM
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my friend has the f22 tranny and his pulls hard. he has the h22a1 with bolt ons and he wasnt behind mizlude by much and miz has the type s.
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Old 01-05-2008, 12:51 AM
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mine is the h22a4 though ! would that make any difference
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Old 01-05-2008, 01:42 AM
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Marginal. I'm not familiar with the gearing on the F22 trannys, so can't comment on that. But you shouldn't lose VTEC if you do everything properly.
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Old 01-05-2008, 02:27 AM
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F22 trannys are geared higher. They are way more durable but not as efficient. Since it's tougher than H22 trannys, it shifts a little slower so you may want to think about getting a performance clutch as well as a short shifter to aid it. H22A4's VTEC will work fine but you risk having it disengage everytime you shift at high speeds b/c of the nature of f22 trannys. Depending how you're shifting, your rpms will be more inclined to drop below 5K kicking out VTEC everytime you change gears. But you could just redline the $#@* out of your H22 to make sure you stay in VTEC! hahaha
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Old 01-05-2008, 02:44 AM
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I personally really disliked the m2l5 transmission & gearing in my old Accord.
that link above should further explain the gear ratios for you.
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Old 01-05-2008, 03:31 AM
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just get a neo and change the vtec disengagement down.
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Old 01-05-2008, 07:03 PM
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No don't do that.

The VTEC crossover point is set at the optimal point from factory. Meaning that when the two torque curves cross over is when the cam changes. Although whether or not it's 5000, 5200 or 5400RPM is open to opinion. Unless you have done something to the engine to warrant shifting the VTEC crossover point from the factory setting leave it where it is.
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Old 01-05-2008, 07:04 PM
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so what sould i do anything ???
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Old 01-05-2008, 07:06 PM
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so what if you fall out of vtec...
just go back into it?
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Old 01-07-2008, 02:01 PM
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if you have a vafc or an ecu which allows you to change air fuel and vtec shift point you should actually notice a gain in performance if you change your vtec shift point to 4800 rpm and set disengagement to about 4750 - i dunno about US speed laws but if your driving constantly at 90mph u will be in vtec all the time, i dont know what mods you have but it should work with minor bolt on mods like induction kit, exhaust, manifold. you will also find that your vtec is not as aggresive as before but is more smoother and the power will still be there.
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Old 01-07-2008, 02:47 PM
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Quote:
Originally Posted by thomas97 View Post
so what if you fall out of vtec...
just go back into it?
With my H22 and M2Y4 tranny, when I really get on it hard, and shift right towards red-line (around 7k - 7.25k), I stay in V-tec, and pull HARD on the shift. I'd say that when I upshift, I come in right around the 5k mark, this way V-tec stays engaged (v-tec on a 5th gen engages right around 5200 rpm, but it disengages lower, around 4600 - 4800 i believe. It's done like this so that if you are floating right around the 5200 mark, v-tec isn't engaging/disengaging rapidly... Once it engages, it won't disengage till the RPMs drop sufficeiently, this is also helpful on the shifts, because this way when you up-shift, even if you drop down to the 4.8-5.0k range, you are still staying in v-tec because you haven't hit the disengagement point yet). With the F22 tranny, the gearing is longer. Therefore, even if you shift close to your red-line, you may not come into your next gear at a high enough RPM for v-tec to stay engaged. So sure, you can always "go back into" v-tec, but you may lose valuable hundredths or even tenths of a second getting your rpms back up to that 5200 mark so that v-tec can pull again... because we all know that our cars are somewhat limp when they are out of v-tec.


But, like everyone else said, the main pro to this setup is better fuel efficiency because you will be keeping your rpms lower for the most part.
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Old 01-07-2008, 02:52 PM
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Quote:
Originally Posted by R8GYY View Post
if you have a vafc or an ecu which allows you to change air fuel and vtec shift point you should actually notice a gain in performance if you change your vtec shift point to 4800 rpm and set disengagement to about 4750 - i dunno about US speed laws but if your driving constantly at 90mph u will be in vtec all the time, i dont know what mods you have but it should work with minor bolt on mods like induction kit, exhaust, manifold. you will also find that your vtec is not as aggresive as before but is more smoother and the power will still be there.

You should never change your v-tec engagement/disengagement points unless you are doing it while tuning. The proper method for doing this would be to do two dyno runs... one with the v-tec engagement point set very low so that your engine stays in v-tec the entire run... and one with v-tec engagement set very high so that your engine doesn't go into v-tec at all. You take these two dyno plots and overlay them on top of each other, and set your v-tec engagement point to the point closest to where your two torque curves cross eachother. Simply lowering your v-tec engagement point without a proper tune is not recommended at all. Also, your engagement and disengagement points should be MUCH more separated than 50 rpms. See my post above for an explanation why.
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Old 01-07-2008, 03:56 PM
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just bounce it off the 8000 rpm line..that way u know u gonna be in vtec all the time..prob solved..lol
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Old 01-10-2008, 12:07 AM
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