this probably sounds really stupid but i dont know that much about the engine computer and i really want my h23 non vtec prelude to rev out longer. What kind of chip or computer or w/e exactly is it that i buy to make my 95 SI rev out to about 7500-8000......?........i already tried searches but none of the results gave a straight answer...i already posted this in the "Tech/Misc." forum but no replies.......help!...

 

You didn't get an answer to this question before because it is rediculous......to put it nicely.

Why do you want to rev the motor that high? This ought to be interesting. lol

 

i just want my gears to be a little longer......lol ....i just want to be able to rev out as long as the vtec prelude......around 7500............so what do i need to buy and about how much would it cost

 

basically there is no point in revving the h23 to that point because there is no power up there and you risk damaging your engine. .

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by -95LudeSI- &raquo;</TD></TR><TR><TD CLASS="quote">i just want to be able to rev out as long as the vtec prelude......around 7500............so what do i need to buy and about how much would it cost</TD></TR></TABLE>

A VTEC engine, perhaps?

 

VTEC preludes are ment to rev higher so that they can shift at a higher RPM which will drop them back into vtec for the next gear. H23's are non vtec, therefore does not need a higher redline.

But if you must rice it out, you can buy a spoon chipped and programmed p14 (OBD1) ecu on ebay for around $300.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by chitownrida &raquo;</TD></TR><TR><TD CLASS="quote">basically there is no point in revving the h23 to that point because there is no power up there and you risk damaging your engine. . </TD></TR></TABLE>


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by -95LudeSI- &raquo;</TD></TR><TR><TD CLASS="quote">i just want my gears to be a little longer......lol ....i just want to be able to rev out as long as the vtec prelude......around 7500............so what do i need to buy and about how much would it cost</TD></TR></TABLE>
If you want your gears long then get a different tranny. Once you go passed redline in a h23 you are risking floting a valve

 

There is a reason that the H23 crank is not used in the higher RPM H22 engine. The H23 engine has a longer stroke & a very poor rod/stroke ratio. Thus, it's not meant to rev high. This is eactly why many of the H23/H22 frankenstein engines do not last long, the H23 crank was not made to rev past 7000 rpms max.

 

Your computer is not what will allow you to rev higher, your valvetrain is

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92SleeperH23 &raquo;</TD></TR><TR><TD CLASS="quote">Your computer is not what will allow you to rev higher, your valvetrain is</TD></TR></TABLE>

The computer allows you to rev higher.... the valve-train allows you to withstand this higher rpm without going to ****.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PrecisionH23a &raquo;</TD></TR><TR><TD CLASS="quote">The computer allows you to rev higher.... the valve-train allows you to withstand this higher rpm without going to ****.</TD></TR></TABLE>

right...that's what i meant. Allows your engine to handle the higher revs

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dougs96SI &raquo;</TD></TR><TR><TD CLASS="quote">VTEC preludes are ment to rev higher so that they can shift at a higher RPM which will drop them back into vtec for the next gear. H23's are non vtec, therefore does not need a higher redline.
</TD></TR></TABLE>

Not really. The H22 revs that high beceause it makes power up there; not just because the Honda engineers thought it would be cool to shift that high. VTEC does not determine appropriate gearing: the powerband does.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by luder94si &raquo;</TD></TR><TR><TD CLASS="quote">There is a reason that the H23 crank is not used in the higher RPM H22 engine. The H23 engine has a longer stroke & a very poor rod/stroke ratio. Thus, it's not meant to rev high. This is eactly why many of the H23/H22 frankenstein engines do not last long, the H23 crank was not made to rev past 7000 rpms max.</TD></TR></TABLE>

Wrong. The H23 VTEC usually fails because the guy that built it built it wrong. The R/S ratio is not hardly any worse than the H22, and the stroke is not THAT much more.

Want to rev higher? Get a new ECU programmed to rev that high, upgraded cams, springs, retainers, and some extensive portwork on the head and intake. Until you have a HIGHLY modified H23 and are going for big power n/a (as if there is such a thing w/ an H23 ), there's no point in trying to make it rev that high.

 

new valves. valve springs. new retainers. retarded timings. destoke it.

oh yeah, go get a RSX type S.

get someone to chip ur ecu and let it rev up to 9k. then, go rev it to 9k so i can laugh at you when you come back and make a post about why ur engine blew up.

 

how about sell the lude and get a car w/ a B16A in it

then in a few months, he'll be asking for more torque.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cpforyou &raquo;</TD></TR><TR><TD CLASS="quote">a few months, he'll be asking for more torque.</TD></TR></TABLE>

LOL...Isnt that the truth

 

kid, i had a 91 Si lude with a B20 in it. be glad with the power that the H23 has. and 6500 rpm aint bad at all, most V6, V8 cars wont go over 5500,6k. reving it past 6500 for H23 or 7500/8k for h22 is crazy and leave it to the B16, B18 people to rev it over 8k

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LudeyKrus &raquo;</TD></TR><TR><TD CLASS="quote">Want to rev higher? Get a new ECU programmed to rev that high, upgraded cams, springs, retainers, and some extensive portwork on the head and intake. Until you have a HIGHLY modified H23 and are going for big power n/a (as if there is such a thing w/ an H23 ), there's no point in trying to make it rev that high.</TD></TR></TABLE>

He could also just put a H22 head on there.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tarheelsoldier &raquo;</TD></TR><TR><TD CLASS="quote">kid, i had a 91 Si lude with a B20 in it. be glad with the power that the H23 has. and 6500 rpm aint bad at all, most V6, V8 cars wont go over 5500,6k. reving it past 6500 for H23 or 7500/8k for h22 is crazy and leave it to the B16, B18 people to rev it over 8k</TD></TR></TABLE>

or the f20c which comes in an ap1/ap2. or the k20

and the longer gears??



you want longer gears usually for gas saving purposes. what the hell is the point of revving higher when u lose power and u accelerate slower because of the gearing ratios.