So which is it guys? For 9psi should one use 2.5" exhaust or 3"?
By the way is it still possible to obtain the Motorvations 9psi pulley? Do they have a website or do you just have to call the guy?
If I chose to go the Accord pulley route do I replace the stock crank pulley with the 98-02 Accord crank pulley and call it a day? I assume I'll need a different belt? If I were to do this could I instead use a lightweight underdrive pulley?
Man I swear this is one of the quietest least helpful forums I've ever joined. What is it you all think I need to search more? Some of us have a wife and two kids to devote our time to after we get out of our full time jobs and can't spend 30minutes searching. I have been doing lots of research ever since I bought this car and haven't found definitive answers. Please help people.
Man I swear this is one of the quietest least helpful forums I've ever joined. What is it you all think I need to search more? Some of us have a wife and two kids to devote our time to after we get out of our full time jobs and can't spend 30minutes searching. I have been doing lots of research ever since I bought this car and haven't found definitive answers. Please help people.
Nobody on this forum knows what they are talking about anymore.
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dont use an underdrive. if you actually searched you would find that its a questionable product. whats the point of getting an underdrive accord pulley? wouldnt that just bring it back to ~prelude pulley size? ask prepreludesh. i believe he has an accord pulley and is running 9 psi with 2.5" exhaust
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David
01 SSM SH
93 d15 auto del slo gone and FORGOTTENexcept for a few memories....
I think nobody answers this question because they might not've had experience with both. In order to fairly tell you that answer, I would have to tune my car on the dyno with my 9psi setup and my 2.5" exhaust, then quickly take it off and put on a 3" exhaust and tell you which made more power.
For the record, my only dyno tuning session wasn't even on a true 2.5" exhaust, the header collector was 2.5", into 3" (on both ends) catalytic convertor, then into a 2.36" Greddy Evo2 Cat Back Exhaust. So my numbers aren't even what they could've been.
If/when I get my car dyno'ed again, it will have a 2.5" exhaust all the way thru (which it has now), but I don't ever plan on going for full 3", I just don't see the point yet for me.
However, Geramy (the Einstein of Supercharged Preludes) will tell you that 3" is the only way to go.
And yes, i do have a 98-02 Accord Pulley and yes, it does bump it up to 9psi. One time I observed 10psi flash across my boost gauge. You need a slightly larger belt, but the simple trick to finding out the size is to take a piece of string and run it all around all of the pulley's it'll spin on and then measure out that straight distance. Viola, you've got your belt length.
Also, if you don't have time to search, what makes you think you have time to work on your car? You say you have a wife and 2 kids, shouldn't you be spending your money and time on them?
Man I swear this is one of the quietest least helpful forums I've ever joined. What is it you all think I need to search more? Some of us have a wife and two kids to devote our time to after we get out of our full time jobs and can't spend 30minutes searching. I have been doing lots of research ever since I bought this car and haven't found definitive answers. Please help people.
First off, 3" exhaust will without a doubt in my mind make more power than 2.5". I can't find it now, but I saw an NA RSX-S dyno comparing 2.5" and 3" and the 3" made significantly more power through the whole rpm range. No noticeable loss down low. People who say a smaller exhaust is needed for low-end torque will probably cite such phenomena as "back pressure", which is preposterous. Mass flow (and velocity) is all you care about, not "back pressure."
I think this fallacy comes from domestic V8 engines with very short 4-1 headers/manifolds where the exhaust plays a larger role in scavenging. Our headers are quite long, by comparison, and I think the exhaust pulses are pretty well summed at the point they reach the exhaust pipe, proper. The downside is that 3" will be somewhat louder and routing/ground clearance can be an issue, as well as being more expensive and slightly heavier. If you don't understand what any of this means and care to understand it...you guessed it, search!
Secondly, I will say I helped answer your question about 450cc injectors, in another thread, so I have now established myself as being helpful, at least in your case. So, don't even try to claim I'm not.
However, this quoted statement of yours is incredibly arrogant, in my opinion. YOU are so busy and important that instead of YOU spending 30 minutes to figure out an answer to YOUR question, YOU expect everyone else to be at YOUR beck and call? Wow. Let's play that game...I run my own business, am in graduate school full-time and have a girlfriend. I guess I have all the time in the world to regurgitate hackneyed information for others when I'm not doing research for or working on my own car.
If you're going to ask a question (which I can only assume you know you could find the answer to with a moderate amount of looking), at least think about not having an attitude about it.
No I'm Hispanic and Christian...plus I'll probably be paying someone to do anything supercharger or exhaust wise (no time lost for me). When I do work on my car it's usually a good opportunity for my son to play outside or learn from me...money wise I can afford it for the most part, but that's why I'm staying away from rebuilding the whole engine like I did on my Sol which just wound up being stolen anyways.
As far as pulley goes I didn't think underdrive pulleys were different sizes from stock to avoid using different belts, just different weight. After doing a search for one on ebay though it almost looks like the OBX underdrive crank pulley is universal fit for Accord 2.2L, Accord 2.3L & I believe Prelude was on that list as if to say all these crankshaft pulleys are same size???
Go for the 3". I agree with the above statement made about the V8 collector fallacy being applied to Honda motors. I'm currently running the Jackson blower on the H22 in my Civic, underdriven to 9 psi with the Accord pulley. I have a 2.5", and I am definitely loosing some power, according to almost every knowledgeable source I have looked at. A lot of NA builders are even doing 3" pipes for fully built H22s, and with higher boost levels, velocity no longer trumps volume in the primary exhaust unit. Unlike turbos, you can still utilize scavenging with a good header; think nice long primaries, and a good 4-1 setup (assuming you want a high top-end). After that, however, you want to get that exhaust out as easily as possible. I'm not an engine builder with six dynos in my garage, but that's the most common and most logical answer that I came to when researching this and asking those who know for my setup. Good luck!
Everyone else is probably right, 3" is the way to go. I personally went with 2.5" because at the time, I didn't see what sense it made to have an exhaust that was 2.5" all the way to the catalytic convertor to then suddenly go to 3". In the future, if I decide to get a bigger exhaust, I'll make sure to get some dyno runs in before and after just to show if there were any improvements.
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