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EVOIV

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Everything posted by EVOIV

  1. I think there is a difference. Normally, an external wastegate is mounted on a separate pipe from the exhaust manifold. So when the wastegate is opened, some air bypasses flowing through the turbo. If the wastegate is mounted on the exhaust housing of the turbo, the exhaust air always flows into the turbo and then out through the wastegate...so the air never bypasses the turbo.
  2. amu: In terms of driveability, I am strictly talking about *when* the turbo starts making boost...not really considering whether or not the car is on/off boost between gear changes. And to me, my personal opinion is that a car making 1bar at 4500rpm is a little laggy for street. Just my opinion, but other people may think that's fine for the street.
  3. Hmmm...would be interesting to see a car with that setup. I've never seen it done before. But in most setups the wastegate is mounted on a separate pipe off the exhaust manifold, and don't manufacturers usually tune the length of the manifold for equal pressure?
  4. Oops! Sorry, I forgot that there was a larger one - the 25g. I think 1bar at 4500rpm is still a little laggy for street use...but then I guess it's all to personal preference. I used to have a GT3037S on my 2L and that wouldn't make any boost until 3500rpm. So 1bar probably around 4500rpm...and I thought that was a little too laggy for street.
  5. Yeah, go the s14...or even a 180. Or even better, buy a Toyota ECHO and turbo it like Top Secret
  6. I can see what you're saying, but no matter how well you do it it will never be as smooth as it was originally. And seeing that exhaust gases are going to flow through this real fast, it will cause some form of turbulance problems. Would even cause more back pressure than normal and wouldn't that disturpt the flow of the exhaust gas and affect the spinning of the turbine wheel and the whole turbo as a result? amu: I think the 20G could produce more than 250kW@wheels. Probably more closer to 300kW@wheels? You said boost kicks in at 4500rpm and this is not laggy??? Or did you mean full boost (1bar) at 4500rpm?
  7. Getting a dump pipe now Hiep? I heard that an exhaust improves fuel economy...but then again, I don't know why!?
  8. Hmm...I guess it will have to be quite precise and smooth as to not disrupt exhaust flow? Me myself I would personally stay clear from tampering with turbos, especially the exhaust housing as it's designed to flow smoothly. But then again I'm no expert
  9. Is that the TIAL wastegate? Also, I think you'd be very lucky if you got full boost before 3500rpm. Unless your max boost is 7psi? It is a very large turbo, exhaust housing anyway.
  10. Hmm...it just occured to me, looking at your picture of your turbo and wastegate...does that mean that you have cut a hole into the exhaust housing of the turbo? I believe that a wastegate has two outlets. One usually bolts onto the manifold, where the exhaust gases enter the wastegate...and then the other outlet is for the wastegate piping to flow out to excesss exhaust. Am I right in assuming that you have cut a hole in the exhaust housing? If so, how was this done?
  11. Awww...that's the whole point of an external wastegate isn't it? What's the use if it's not going to dump straight out to atmosphere? I used to do that. Great sound when it opens at full boost!!! To me, an external wastegate is like a BOV. Although they do have functionality (reduces lag/better boost control), everyone knows that the real reason is for the sound. Be that a whoosh or a bark. A whoosh and a bark is even better Let me know how the car sounds when the turbo is spooling. My previous turbo made a much louder noise than my standard one at present. It was a kinda high pitched noise that got louder. You should get no probs from the cops unless you zoom past them at full boost, cos that's the only time you will ever hear the wastegate. Just be careful, that's all. Hope the results are good!!!
  12. I might have an HKS GT3037S turbo for sale later. One is rated at 450PS the other at 480PS. How did you blow up your SR? Too much boost?
  13. I am not sure if putting the external wastegate on the exhaust housing would be such a good idea. I'm no expert, but wouldn't that setup increase the amount of heat as the exhaust housing is gonna be damn hot, and so is the wastegate? I think the real problem with that setup is that you will need a good manifold to suit. Will the manifold be nice flowing and one that is matched? Anyway, would be interesting to see the results. The turbo does seem pretty big, hopefully not too laggy on the RB25. What happens if you want to change to a smaller exhaust housing? You'll have to weld off the wastegate too right? Another thing, is the manifold a high mount? If so, won't you have problems shutting the bonnet of the car with the wastegate sticking out? Or is it a low mount manifold? Room in the engine bay could be a problem. I guess you could always cut a hole in the bonnet and let the wastegate stick out
  14. Well, FYI I used to run an HKS GT3037S with 0.6 compressor housing and 0.73 exhaust housing on a 2L engine. It wasn't until around 3500rpm did the car make any decent boost. I think the 0.86 exhaust housing might be OK, but depends upon what you define as "street driveable". But I wouldn't go any larger than a 0.86...that's my opinion anyway. Just out of interest, where is Garrett from? Is HKS from Japan? It seems that the two most popular choices for turbos in Japan are HKS and TRUST. What brand of turbos do people in the US use? Anyone?
  15. Yes, good luck! That turbo seems very large by all means, hope it's not too laggy for street use.
  16. This Garrett vs HKS debate has been around for a long time now. To settle this, what really needs to be done is testing an HKS turbo with the near equivalent Garrett turbo on the same car, under the same conditions. Many people say Garrett are just as good as HKS, people say HKS are a lot better than Garrett. I don't think anyone really knows unless they've seen it. All that I can say is that the world seems that HKS is more reknown than Garrett. For performance cars anyway. Would anyone disagree? Now one possible explanation is that HKS turbos are featured in many more world reknown cars, hence boost their popularity. It's just like "Sony". Obviously they did something right to gain such a name. But just like Sony, HKS turbos are far more expensive than their seemingly equivalent counter parts. Having said that, doesn't necessarily mean that all HKS products are superior. As I am sure you will find that some things made by Sony aren't the best, and there is a lot more competition out there that is just as good, if not better! Same things go for turbos, and everything else on the market. One thing that I am sure of is that HKS turbos are not the same as Garrett turbos, and therefore there obviously must be a difference. Also, it is well known that HKS turbo are more efficient at higher boost than Garrett turbos. But I have not seen the proof, but if it's such a big "rumour" then there probably is some truth to it. As for which turbo makes more power, or responds better...I don't know.
  17. I still think a 38mm wastegate is too small for such a large turbo that's rated at 600hp. I think it would be equivalent to the HKS GT3240, as I believe that is rated at 600hp too? And I'm sure the kit for that turbo comes with the 50mm HKS wastegate, at least. The smallest HKS wastegate is 40mm.
  18. That's one HUGE turbo!! Is that the GT3540?
  19. Yes, Garrett can supply the "core" of the HKS GT2530, but I am pretty sure that they can not replicate the HKS GT2530 turbo. Meaning that they can't provide you the HKS specific compressor trims. I believe that the turbine trims for HKS and Garrett are the same, it's just the compressor trims that are different. Or maybe I'm wrong? Are HKS turbine trims different too?
  20. I have a 50mm HKS external wastegate. If you go to the HKS USA website, it's called the "Racing Wastegate S/S". The wastegates come with different springs, and mine was the 1.3bar one I think. It was too strong for my application, so a local mechanic put in a different spring (I think) so that the wastegate opens at a lower boost level. Just found out that there's a new GTII Wastegate, looks very nice!!!
  21. Can't larger turbos flow more air because of the larger size of the turbo? I'm pretty sure of that. Think of it this way, a small hose flowing air through it with a small valve to bleed off excess air. If you have a much larger hose flowing air through it with the same sized valve then there is obviously going to be more pressure built up at the small valve and hence restrict flow of the air. Using a larger sized valve for the larger hose will let more air flow out at a lower pressure which will not restrict air flow as much. Now in my analogy, replace hose with turbo and valve with wastegate. I agree that GCG know their stuff, as they seem a reputable company...but what about HKS? I am pretty sure they know a thing or two about turbo systems too
  22. The size of the wastegate isn't everything, but it is still important to use a correctly matched wastegate for the sized turbo. I think a 38mm wastegate for such a large turbo as the GT3540 is too small. They really should supply a 50mm wastegate at least. The wastegate should match the flow of the turbo. So I guess a larger turbo would require a larger wastegate for better boost control.
  23. Steve: If you are interested in wastegate sizes, the external wastegate that I got with my 3037S kit has a 50mm outlet. It's the racing wastegate with stainless steel flange. Not the top of the range HKS GT wastegate (that has a 60mm outlet), one below that. Which wastegate are you getting?
  24. Yes, I'm pretty sure that Garrett do make the HKS turbos...but from what I've heard, you can not buy HKS turbo parts from Garrett. Example: HKS specific compressor trims are only for HKS and if you asked a Garrett dealer to sell you an HKS specific trim, they can't/won't. So, the only way to get an HKS compressor trim is to buy an HKS turbo. Nothing "HKS" can be gained from Garrett. Garrett make their own trims to match their own turbos. I think the bottom line is: Garrett make HKS turbos. HKS do their own research and development and ask Garrett to make the specific trims...etc which HKS then sell as their own turbos. Garrett have their own turbo line up and specs. You can't ask Garrett to make you an HKS turbo, because they are probably legally not able to.
  25. I agree, it's all to personal preference. But nowadays a new Garrett is around the same price as a good second hand HKS turbo. And from what I've heard, the HKS turbos rarely break down unless the engine detonates and scrapnel causes the turbine wheel to be damaged - just like my turbo. In most cases, it's the engine that's gonna blow before the turbo does.
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