Honda Civic Performance - JDM Discussion Engine tech, forced induction, springs, shocks, brakes, tires, etc.

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Old 23-Aug-2003, 01:46 PM
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would changing the head in my crx and putting something else with vtec make a significant difference?
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Old 23-Aug-2003, 01:47 PM
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yes
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Old 23-Aug-2003, 01:47 PM
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not as much as a b16 would but you'll gain more top end
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Old 23-Aug-2003, 01:49 PM
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are there any downfalls to doing this?
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Old 23-Aug-2003, 01:50 PM
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ummm pending you dont over rev your motor you should be fine.... when you run the sohc vtec ecu it will allow you to rev maybe 100 rpm more.... which will make your bottum end go kaboom...

kinda like what matt recently did LOL
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Old 23-Aug-2003, 01:51 PM
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meaning what.. if i dont hit redline in my current car (6500rpm) i'll be fine?
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Old 23-Aug-2003, 01:52 PM
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correct... like my motor revs to 7500 and that will snap a rod and such on yours
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Old 23-Aug-2003, 01:52 PM
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doesn't a head provide better top end? i won't achieve this if i can't really rev higher ...
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Old 23-Aug-2003, 01:53 PM
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are you talking about a new head... or header??
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Old 23-Aug-2003, 01:54 PM
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ok you mean a head...

which shouldn't be confused with getting head...
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Old 23-Aug-2003, 01:58 PM
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it will provide more power throughout the power band... mostly on the top end though cause of the vtec cam lobes
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Old 23-Aug-2003, 01:58 PM
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how much gain can i expect?
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Old 23-Aug-2003, 01:59 PM
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i'm not 100% sure... you might get 20hp
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Old 23-Aug-2003, 01:59 PM
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hmmm it might be worth it afterall .. thanks
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Old 23-Aug-2003, 02:00 PM
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its a bit crappy to wire in though
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Old 23-Aug-2003, 03:30 PM
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you will need a sohc vtec head and 92-95 sohc vtec ecu...then convert it to obd1 (wireing will be a slight bitch for an amature)

you shoudl be fine all the d series bottom ends are the same its' nto liek the si bottom is stronger it has the same rods...yoru compression will be boosted to into the low 10:0's so maybe a fpr to get alittle for fuel into the cylinders....or a vafc to tune it good...
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Old 23-Aug-2003, 11:45 PM
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Si rods are not the same as on a cx motor both d series i've seen them both and they are not the same.... a 1.5L cx motor can not handle being reved to 7500 or 7800 depending on which ecu your using....

there is a reason why honda has the red line at 6500 on the crx Si's..... its cause it can't handle being rev'd higher.... putting on a d6 or y8 head will allow the motor to rev to 7500 which pushes it far beyond what it can handle
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Old 24-Aug-2003, 07:28 AM
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Rick, 7500 will not ruin Mikes motor, I reved the crap out of my zc sohc, same motor inhence,

I also had an integra ecu on seans black crx, and reved it too 7800 rpms..


the reason my motor blew is #1 because the bottom end was an automatic, and I removed the revlimiter, and it died about 8300-8500 rpms


usually you can go about 300 rpms - 500 rpms higher than stock cuttoff.
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Old 24-Aug-2003, 07:31 AM
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btw, Mike If you go with vtec, you dont NEED to wire OBD1 ...
its a pain in the ***.

just get a pw0, or pr3, or use a "chipped for vtec" ecu..

that way it plugs in and can utilize VTEC with 1 more wire depending..instead of a "conversion - harness"
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Old 24-Aug-2003, 10:47 AM
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handa put rev limiters in there cars for a reason....

bumping the redline of a car by 1000 rpm is not a good thing to do
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