Jump to content
SAU Community

Recommended Posts

Hey all i recently started pulling down my RB25 DET due to a loss in power and i was planning to send my turbo away to GCG to get it Hi-Flowed anyways.  In the process i found a substantial crack in my exhaust manifold so now i am re thinking the hi flow option as now i need a new exhaust manifold.  My end goal is running 300rwkw which i knew was a stretch for a Hi-Flowed anyway.  My question is now that i need a new manifold am i better off getting an aftermarket manifold and t3/t4 turbo or just replacing it with a stock one and running the Hi-Flowed?

At that power goal and a high-flow Id go stock too. A top mount setup will cost more and be more work. If you want more power in the future (like most of us do after a while :D) you can then sell the highflow and go top mount

Thanks for the reply's.   They do look better ceramic coated:1312_thumbsup_tone3:haha. Does anyone know what the power limit is on the stock manifold? and where i can source a new one?

 

I sold my normal rb25det manifold for 20€ here in Finland. I assume you can get a good condition used one for similar price elsewhere too as people are going top Mount all the time and just want to get rid of the oem stuff.

 

I wouldnt bother with coating. Save the money for something else

New price at $300 - $500 is OK - my top mount cost $1600 although you can get cheaper ones. Stock one will easily do 300RWKW. I bought a highflowed RB25 turbo from GCG many years ago - today I would definitely go with Hypergear

stock manifolds crack for two reasons, aftermarket exhausts weigh considerably more than stock, so they need that support bracket near the cat, it often doesn't get replaced. The second issue is the torque wrench is impossible to get into the engine bay to tighten up the manifold nuts, use an open ended spanner on the torque wrench to get a hand feel for the required torque, then replicate that torque as you are tightening the the nuts...also FFS buy a new set of studs, yokes and washers when you change the manifold, as the mani heats up it grows, too tight, or old yokes and washer and the mani will not be able to move as it should.

  • Like 1
I sold my normal rb25det manifold for 20€ here in Finland. I assume you can get a good condition used one for similar price elsewhere too as people are going top Mount all the time and just want to get rid of the oem stuff.
 
I wouldnt bother with coating. Save the money for something else
Ceramic coating is seriously one of the best things you can do for manifolds or any exhaust parts. Increases the lifespan whilst maximizing heat transfer. Not too expensive either. Cost me $200 to get the manifold coated
Ceramic coating is seriously one of the best things you can do for manifolds or any exhaust parts. Increases the lifespan whilst maximizing heat transfer. Not too expensive either. Cost me $200 to get the manifold coated
Sure it might be good for them. However most oem manifolds are still rocking good after 25 years so dont think coating them is gonna do much. And even if it did, you could just buy of new good condition second hand one for less than the coating costs. Id rather use that 200$ on a better spec turbo.
  • Like 2

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Just trying to get my head around this. At 5psi of boost, you turn on your wmi pump, and then you're using a 3000cc injector, to allow flow upto the actual engine, where you have your 6x200cc injectors and a 500cc injector. If the above is correct, what advantage are you obtaining by having the 3000cc injector blocking flow, is this just incase a line breaks between that injector and the motor you can stop flow immediately? Or are the 6x200cc and 500cc less injectors and just spray nozzle?
    • Welcome! New member myself, but I had an R33 back in 2002. Best advice I could give, based on my experience: if you're running the factory turbo, be very conservative with boost. I made the mistake of just fiddling around with the boost controller and cranking the boost for fun, and the end result was my intake pipes popping off frequently from the constant deluge of oil that was being blown into the recirc by the stressed-out turbo, which itself was siphoning oil from the engine and farting it out both sides of its centre bearing (or something to that effect). If I could do it all again, I would have gotten a new turbo and had a tune dialled in professionally and then just left it alone! Funny you mention the metal shavings in the gearbox, as I had the same thing - the probe plug (magnetic drain plug, essentially) would come out caked with shavings. At least it was doing its job. Not sure if that's just sacrificial wear and part of the deal, or if my gearbox was shagged, but I wasn't abusing it. Enjoy the R33 - they're a dying breed, and if they weren't $35k+ on CarSales in Queensland, I might have picked up one of those again, instead of the 370GT I own now (though I'm loving the 370GT, that big 3.7L V6 just hits different).
    • Howdy folks. I owned an R33 back in 2002, which was thoroughly beyond my capacity (financially speaking) to maintain/insure, so we parted ways in 2004. Fast forward 21 years (to literally yesterday, in fact) and I'm now the proud owner of a 2007 V36 370GT. I'm happily surprised by how much power the VQ37VHR makes, compared to the RB25DET, considering the latter is turbocharged. I had planned to add a turbo at some point but I'm on the fence about whether I'll even need it (though I do love the sudden onset of extra torque). Any other 370GT owners around the traps, I'd love to hear about your experiences with this car (good and bad).
    • Perhaps the answer is... more jacks!* *proper jacks must be used.  
    • I NEVER think about using a scissor jack unless there is absolutely no other alternative. f**king things are dangerous, annoying and stupid.
×
×
  • Create New...