I recenty purchased a bone stock '99 Prelude V-TEC base model w/ auto trans. I lowered it and added a after-market alluminum under drive crank shaft
pulley. Then I added on some headers & free flow cat. What I noticed is it changed the power band of the V-TEC but it robbed the mid range & top end power. i ended up removing the exhaust & went back to stock. Can anyone explain why this happened or was I supposed to upgrade something when adding headers to a H22A. Mechanicaly the motor was perfect before the perf upgrade.
There is 149k on the car. So far no issues with trans. fluid was clean when I got the car. I replaced the fluid anyway. I did use Honda ATF fluid. What does the trans have to do with exhaust robbing power from a motor anyway. With stock exhaust the VTEC runs perfect. Little sluggish on take off. then the first came kicks in till 4rpms then the 2nd cam kicks in till 7 rpms. With the exhaust almost the same except you can feel loss of HP's.
Okay, for your power issues: The 5th gen has a decent tubular exhaust manifold from the factory. Unless you dump some serious coin on a high-end header, you aren't going to gain much more than decibels. So basically, you're probably running a high flow cat sandwiched between a stock exhaust and near-stock header. That said, it's possible that you've actually added restriction, or at the very best, matched the stock flow. The best cat in the world isn't going to do anything when it's bottle necked at both ends.
Back to your tranny. Start searching the forum, and make sure you have plenty of kleenex. You'll need it for the tears you're gonna be shedding.
Whilst your searching you might also want to read up on the possible issues with running an aluminium crank pulley since they lack a harmonic balancer.
OK...So unless you do some serious engine upgrades like cams, head work and lower end work the headers doesn't do sh__ to a VTEC. What to you suggest for bolt on upgrades (if any) to increase power??
There is 149k on the car. So far no issues with trans. fluid was clean when I got the car. I replaced the fluid anyway. I did use Honda ATF fluid. What does the trans have to do with exhaust robbing power from a motor anyway. With stock exhaust the VTEC runs perfect. Little sluggish on take off. then the first came kicks in till 4rpms then the 2nd cam kicks in till 7 rpms. With the exhaust almost the same except you can feel loss of HP's.
Automatics are horribly slow, and no amount of money will make them fast. This has been proven time and time again.
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Pretty sure that various headers (plural ok here, but each car being a S4 only has one header) have been dyno proven to provide a gain even on an otherwise stock motor. Not talking anything that is basically the stock header, but just in stainless steel though.
To get the most though you need to tune and with an auto I believe you are stuck running piggybacks (just another of many drawbacks to an auto).
Pretty sure that various headers (plural ok here, but each car being a S4 only has one header) have been dyno proven to provide a gain even on an otherwise stock motor. Not talking anything that is basically the stock header, but just in stainless steel though.
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Vague? Compared to the OP not saying what header they fitted and that all headers have no effect. Just saying that some headers have been shown to bring some gains just by themselves. Specific examples weren't required. If anyone cares about the potential gains of various headers, they can search.
hey tee dot, why you such a dick? who cares if its v-tec or vtec? the guy obviously likes his car and just because yours is different and is a manual doesnt mean he wants to hear your jabs about how much his car sucks because its an auto.. be a more positive person and productively add to discussions with people who clearly enjoy their cars without your approval. he wasnt asking if you liked his car, he was asking a perf question. get lost.
lol! This thread is headed in the right direction...
I don't see any problem with his response. He just stated a fact: the automatics ARE slow and unreliable
But still it's not nice to disrespect people and their cars. EDIT : Just answer the damn question that people want to hear . I know certain PO people get on this hype
As some people like to say. Dyno will only help you out and prove that your loosing power I haven't seen any one say anything about getting dyno to prove if you have lost or gained power. You should work on it from there to find out wth is wrong. BTW I found out recently that my old SiR had 3 inch custom extractors on it and it gave my S Spec a run for it's money when I raced it with my friend. Yes the SiR was an SS
hey tee dot, why you such a dick? who cares if its v-tec or vtec? the guy obviously likes his car and just because yours is different and is a manual doesnt mean he wants to hear your jabs about how much his car sucks because its an auto.. be a more positive person and productively add to discussions with people who clearly enjoy their cars without your approval. he wasnt asking if you liked his car, he was asking a perf question. get lost.
Helpful hint: The '' emoticon at the end of my v-tec vs. vtec statement let on that the tone of my sentence was meant to be taken in a good natured fashion. You can always get a good idea of the tone of someone's post by their use of emoticons. For example, if I use a & a emoticon when responding to you, you can assume that I think you are a dumbass fvcktard, which I do.
As far as SS vs. 5-speed trannys go, I didn't take any jabs at him. I simply made him aware of the ongoing problems with the SS tranny. Would you rather I just let him find out the hard way? Again, & come to mind.
Not everybody is content in the misspelling of certain acronyms, and blindly trusting in a mechanical component that's been a proven weak link. You're certainly welcome to continue skipping down that path like some half-retarded sheep, though!
Helpful hint: The '' emoticon at the end of my v-tec vs. vtec statement let on that the tone of my sentence was meant to be taken in a good natured fashion. You can always get a good idea of the tone of someone's post by their use of emoticons. For example, if I use a & a emoticon when responding to you, you can assume that I think you are a dumbass fvcktard, which I do.
As far as SS vs. 5-speed trannys go, I didn't take any jabs at him. I simply made him aware of the ongoing problems with the SS tranny. Would you rather I just let him find out the hard way? Again, & come to mind.
Not everybody is content in the misspelling of certain acronyms, and blindly trusting in a mechanical component that's been a proven weak link. You're certainly welcome to continue skipping down that path like some half-retarded sheep, though!
1. emoticons are juvenile.
2. he's not asking your guys opinion of his tranny or car.
3. you guys can inform or give from your seemingly encyclopedic knowledge base of which cars "suck," in a more civil fashion and still get your point across.
4. if you're from "t-dot" as in toronto that would explain a lot.
5. if being a "sheep" means taking other peoples point of view into consideration before "telling them how it is," then sure label me a sheep.
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You can file me under the list of people who don't care.
& a 
emoticon when responding to you, you can assume that I think you are a dumbass fvcktard, which I do. 
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