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Originally Posted by vr4lover
ok just a few questions that i think i need cleared up before i start to mod out my vr4.
1. Wastegate. What is it and what does it do?
2. Blow off valves. Do i need 1 or 2? And where do i put it(them)?
3. Boost controler. Is it worth having without upgraded internals or fuel pump and injectors?
4. What is the main differance that makes more hp in the later gens vs the 1st gen?
5. If i buy a different downpipe do i need one with an 02 eliminator for a 92 vr4?
6. What can i do to beef up the tranny?(manual)
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i'll reply to this one too
1. A wastegate functions by opening and closing allowing how much boost will be run by the turbocharger. It stays closed until the controlled boost level is achieved, then opens up.
2. You wouldnt need 2 unless you are trying to accomplish some sort of show, 1 bov is plenty, although i do recommend replacing the stock blow off valve (bypass valve) because it tends to leak. A common cheap replacement is the 1st generation dsm (eclipse/talon/laser) blow off valves
3. Get yourself a proboost mbc for now, its $18, and you can turn up the boost to roughly 14.5 psi max without any problems, any higher and you will hit fuel cut. The internals can take a beating, nobody has ever maxed out the 3/S internals yet, and is predicted that they can hold up to 1,000 hp (4 bolt main) and the 2 bolt main has proven to hold over 600 hp. If you do get an mbc, you will need an aftermarket boost gauge, but you can get a VDO for around 30 bucks from
www.importpoweronline.com
4. The only difference in power between the 1st gens and 2nd gens are the boost levels. You can easily take care of that by removing the nipple restrictor in your boost solenoid, and then you will be making 2nd gen boost levels.
5. Aftermarket downpipes will bolt up without problems if they are made for the 3/S.
6. To beef it up, really nothing, only thing you can do is get a more powerful clutch and a lightweigh flywheel. My buddy with a BPU RT/TT has trouble holding his power at 14.5 psi and therefore needs a better clutch.