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  1. Anyone here run without a BOV?

    This will be my only post in this thread.Some background on me- I am currently going back to school for engineering. I try to read any engineering white paper I can get my hands on when it comes to centrifugal pump/impeller design. Some of you have read my analysis in the billet wheel thread...
  2. Flowmonster High Flow Cat

    Resurrecting this.They ARE a 49 state legal cat with proper GVWR numbers. I installed one of these flowmonsters last October to pass CO emissions and passed with flying colors. I tested the car before and after, and there was a 75%+ reduction in HC and CO (I was right on the edge of passing...
  3. Kamak STS 9 blade turbine

    Kinugawa turbo Online shopping Cart - MitsubishiScroll down. All three sizes are available- 05h, 06SL2 and 06h4
  4. factory 2 piston big rotor upgrade 276mm-294mm

    And that's kind of what I'm getting at. Larger front rotors or calipers, all else equal, results in more front bias. More front bias is detrimental to the performance of a street car, which typically has too much front bias anyway to cater to the lowest common denominator driver. You end up with...
  5. factory 2 piston big rotor upgrade 276mm-294mm

    Just curious- and I've asked this before on this site and no one answered- Do you guys actually do any math with these upgrades to determine the effects on brake bias, or just hope/assume it all works out?Jake Latham's 2000 Radical ProsportIf it works, it works, but I think full disclosure...
  6. Billet 11 Blade 20G 374hp/369tq 91 pump

    Elevation does hurt spool quite a bit. When I moved from Minneapolis (~sea level) to Arvada, CO (5400ft) there was 300-400rpm more lag before the turbo would hit. So the spool you're seeing isn't too indicative of how the wheel would spool for most people. I knew it would spool slower than the 7...
  7. Billet compressor wheels

    What is your actual elevation? Google places Layton, UT between 4300 and 4800 ft.It's pretty obvious that the people in your other thread trying to compare to a 16g at sea level at the same boost don't understand how altitude affects turbochargers.That's actually one of the reasons the...
  8. Billet 11 Blade 20G 374hp/369tq 91 pump

    Elevation affects turbo cars a lot more than people realize. I'm not ruling out his tune, but the lower ambient air pressure at higher elevation makes some pretty drastic changes to how a turbo car behaves. A lot of people erroneously assume that turbos magically compensate for altitude.25psi...
  9. Billet 11-Blade 20g Compressor Wheel

    Weight doesn't affect spool as much as you'd think it does. This is something that I've only realized lately. The amount of fluid work the compressor is trying to do has a larger effect. Wheels that move more air take longer to spin up through the turbine's low efficiency region. Slow moving...
  10. Billet 11-Blade 20g Compressor Wheel

    Wow, that seems laggy. I run the 7 blade with a TD05h in an 8cm² housing, and I can hit 30psi by ~3500rpm in 3rd gear, and I'm at higher elevation than you are.It sounds normal for a 20g with a TD06 in an 8cm housing. I'd be willing to bet that antisurge housing is costing you some...
  11. Billet 11-Blade 20g Compressor Wheel

    What turbine wheel and housing size?
  12. TD06-3 Turbo

    Depends who you talk to. Garrett engineers seem to recommend using less than a wheel ratio of 1.25, closer to 1 being better (This is ratio of compressor exducer to turbine inducer). I think that has a lot to do with most of Garrett's range using different sized compressor exducers as you change...
  13. Billet compressor wheels

    Weird. I weighed the 05h shaft TurboLab sent me, which was 183g, and an MHI 05h from a 14b, which was 184g.The Kinugawa TD06SL2 is 225g. My TD06 was also 268g, as sqr said above.
  14. Billet compressor wheels

    People keep misusing that term.Extended tips refer to the tips of the exducer on the compressor wheel. The term does not refer to the height of the blades.This is a picture of the extended tips of a KTS wheel:Interesting that the kinugawa wheel weighs the same as my TD05h (Mine was...
  15. Billet compressor wheels

    All good examples, thank you. In contrast, most of the EFR compressors are 7 (14) blades, while the Toyota/Hitachi CT26 variants were all 5 blade, similar to the MAP wheels, and were notoriously inefficient at high boost. I think it would be prudent before trying to figure out a 'general rule'...
  16. Billet compressor wheels

    I don't think it would be correct to call that a "general" rule, as it's pretty clear from the models (which Busemann derived by observing and cataloging actual compressor behavior) that more blades are, generally speaking, more efficient. The efficiency gains that come as you add blades decays...
  17. Billet compressor wheels

    I'm not so sure.The 7 blade wheel doesn't surge at all mated with an 05h turbine in an 8cm² housing on my car. I've seen 30psi (Pressure ratio of 3.45 at my elevation) at 3500rpm in 3rd gear briefly with zero hint of surge. Granted, the 7 blade has the advantage of higher blade count (14)...
  18. Billet compressor wheels

    Those mother####ers told me less than a month ago that wheel wasn't available and wouldn't be for quite a while.
  19. Making DIY ignition cut / REV limiter?

    The problem is that if you cut off the power to the coils while they're charging, you get a spark.You need a method that waits for the charge period to end, for the spark to occur and then kills the next charge event. The method you're proposing could cause serious detonation.
  20. VGT - Blaylock Switchblade

    I've wondered for several years how hard something like this would be to implement in one of our turbos. Kindasorta like the VGT on the RDX turbos, except those have two volutes and a valve that closes one off.
  21. Billet compressor wheels

    Depends on the housing too. The older big16g housings can be machined for larger wheels, but the evo3 housings are thinner and may not have enough material for a TD06 wheel. TurboLab says they've successfully machined an E3 housing for a TD06SL2 wheel, which has about 1.3mm smaller exducer than...
  22. Billet compressor wheels

    No, I had a TD06-18g and a 20g before. Now I have the 20g 7 blade ET wheel and a TD05h-8cm².I agree that a larger turbine is a better match, but I was looking for response more than max HP. So far it has all the power of a TD06-18g with much better response. I didn't know they had 18g sized...
  23. Billet compressor wheels

    You'll see surge on the boost gauge, and usually you'll hear it. The needle will flutter and it'll make a ch-ch-ch sound at full throttle. You're not likely to surge with an A/S housing.So how does the 11 blade spool? I've yet to see anyone actually running it. When are you hitting full boost?
  24. Billet compressor wheels

    It won't be.I got to drive my car with the new turbo yesterday. It's a KTS 7 blade with a TD05h-8cm² hotside. Ran it up to 20psi consistently so far and not a hint of surge. It's making roughly the same power at each boost level as the 20g did with a TD06 turbine in the same 8cm&#178...
  25. Billet compressor wheels

    The TD06 had enough meat for the taller wheel. Must just be a few weird old TD05h shafts that are a bit shorter.
  26. Billet compressor wheels

    Just a heads up, the KTS wheels may not fit some turbine shafts.The taller wheel does not leave enough threads on some shafts for a nut. I have a TD05h shaft from a 14b (right hand thread, 12mm turbine nut) that does not have enough thread for a KTS wheel, but the TD05h shaft TurboLab sent me...
  27. Billet compressor wheels

    The smaller TD05 compressor housing will cost a little bit in maximum flow, but will be more efficient at high pressure ratios, and will feel as if it spools quicker. Surge line doesn't appear to move much, if at all.
  28. Billet compressor wheels

    Me too. Sure is purty. I want to test it with the TD06-8cm² turbine that's in the car right now, but eventually it'll be paired with an 05h turbine in an 8cm² GMC housing. I'm kind of curious if the 06 will be a better match for it (i.e. lots more top end without much difference in spool). I...
  29. Billet compressor wheels

    According to Busemann's model, as radius ratio (inducer/exducer) approaches 1, efficiency drops dramatically. It's relatively constant up until ~0.6 in the blade counts we're working with, but then the curve falls off after that. Lower blade radius ratio is, as a rule, results in better...
  30. 20G internal wastegate bracket

    The difference is that you have lots of meat on the back of the housing by the comp snap ring to drill into. OP doesn't. He may need a different compressor housing.
  31. Billet compressor wheels

    Weird, should be the opposite. More blades are more efficient at pushing airflow according to all of the centrifugal pump models, but take up space in the volute. The 11 blade should flow more, but spool slower and be a bit less efficient at higher boost. This is somewhat borne out by the way...
  32. Billet compressor wheels

    I wish I could see the plot. That guy's using a ridiculous hotside for it, but it's interesting to hear that 60lb is possible from a 52mm compressor.Edit, there it is. Looks like it's on std correction. I'd rather see uncorrected, but I'll take what I can get :DThe lag really isn't even that...
  33. Brand new Borg warner s360 blew

    Brad Penn oil: AAI Speed Equipment, 303.422.35715985 Lamar St , Arvada , 80003Reported price was $45/case.I believe there's a location in Englewood that sells it as well. Duggan Petroleum I think.. It is near the intersection of Santa Fe and Oxford in Englewood.Hill Petroleum is a...
  34. turbo smart waste gate??

    What part of "not easy" did you not understand?If ebay parts worked, they'd be easy. Part of the challenge of building a fast, cheap and reliable car is not just researching which knockoff parts work and which parts don't, but in finding parts from other applications that not only work, but...
  35. turbo smart waste gate??

    Eh, brand names are for people with inferiority complexes. Any idiot can swipe a credit card and build a cookie cutter car with brand name parts. It takes actual ingenuity to go fast for less. "Fast, cheap, and reliable" is entirely possible. Fast, cheap, reliable, and easy is not.It would be...
  36. Agx Coilovers

    The rough ride is pretty much standard for AGX's. Their high speed damping is way too stiff, even on full soft.
  37. turbo smart waste gate??

    There's nothing wrong with how the TS knockoffs work. I've actually held one in my hands. If you haven't, then maybe it would be best to keep your opinion to yourself. They are quality parts, just blemished. They're just not worth the money of a real gate (and IMO, the real gates aren't worth...
  38. turbo smart waste gate??

    Be aware that there were a run of knockoffs a few years ago. They perform just as well as a real gate, but don't pay the price tag of a real gate for one. Look at the cap, if it says 'desigaed in australia' it's the knockoff. Worth $70 tops. I've run one of the knockoffs for several years now...
  39. Billet compressor wheels

    That's the case with pretty much all the cast 20g wheels on ebay. The kamak 20g has the thinner hub and the inducer blades taper upward toward the hub slightly, probably 2mm taller than an MHI wheel, and still only weighing 61g. Only difference I can tell from the Kamak on my desk and that...
  40. Billet compressor wheels

    Are the blades taller than the 20g? The aero looks the same as the old kamak cast wheel. If the aero is the same, it'll perform the same. The kamak wheel was about 61g as well. The 16g below your post definitely has some changes to the aero, most notably more blade sweep from inducer to exducer...
  41. Billet compressor wheels

    Kamak's billet wheel is a 5/5. I'm inclined to think it should flow like a 20g but spool like the cast wheel without the surge (maybe even quicker- less blades=less weight).My reasoning for this line of thought was something I read on here or EvoM from FP about the older (I assume it's older...
  42. Billet compressor wheels

    The newer swept version of the kamak 20g is also taller by a couple mm. Looks like their "stock" 6/6 is about the same spec as the kamak wheel, and the same weight.I guess I'm a different demographic then. I don't want more flow out of the 20g, I want similar flow with better spool and no surge.
  43. Billet compressor wheels

    I also have my doubts about whether these billet wheels are going to spool faster.This guy lists weight as 70.5g: 20g Billet Compressor Wheel OE Interchangeable 11 Blade with Extended Tip TD05 | eBayThat's actually quite a bit heavier than most of the new cast wheels. For example:MHI...
  44. Billet compressor wheels

    Apparently they didn't read Garrett's white paper #2 on Burst and Containment LOLThe champ car guys have exploded Ti compressor wheels though. From what I read, it blew the back of the car apart.Back on topic though- I think these billet wheels will likely require anti-surge housings. If...
  45. Billet compressor wheels

    The housings aren't really a gamble, IMO. You either machine it correctly or you don't, and it's not a rotating part so the incidence of failure for the housings should be low to zero. I've never had an issue with their compressor wheels, quality-wise, but I've only been running them for about 3...
  46. Billet compressor wheels

    That's what my turbo started its life as.I upgraded that syty turbo to a kinugawa 20g wheel/05 housing. That's where the surge problems came from. At sea level, it would spool (on a TD06 turbine, mind you) just above 3000rpm. There's more lag up here in CO, but it would still surge badly in...
  47. Billet compressor wheels

    Question is can any of those billet wheels run in a TD05 compressor housing without surging horribly at part throttle in higher gears? I love how fast the 20g spools in the smaller housing (significantly faster than an 18g in an 06 housing), but I had to change out the compressor because of part...
  48. Billet compressor wheels

    Why not pair it with something you already have data for so we can see just how they perform vs a known quantity?Scientific method FTW.
  49. Perrin BOV?

    It's not misleading at all if you actually understand how the valve works, as designed by yamaha.The valve does not operate on pressure between manifold and charge pipe. It operates on a pressure differential created by a vacuum transfer valve. It allows pressure into both chambers at the...
  50. Perrin BOV?

    If I can ask, contenders in what way? What makes one valve better than the others?Since BOVs do, in fact, cost significant turbo response between shifts, do some valves allow less crappy response than others?The fastest setup is no valve at all- which has been documented fact since the...
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