Just wanting to know if anyone has any experience or here-say on Garrett's GT530BB kit. That is, 2x GT2554R Turbo's, the step-down's from the GT28's. I'm contemplating either one of these kits, of having either some Auto or Manual Turbo's Hi-Flowed for extra power. Power goal is around 270-280rwkw which I think would be plentiful in a 90% road car. Main consideration is keeping boost threshold low. I don't honestly care for top speed, just looking for turbo's that will not choke up at 210rwkw, will provide excellent on/off throttle response for Auto-x, and have the low down torque to throw the back end out effortlessly if need be. Don't want to have to wring the engines neck to make power. Do Hi-Flow's slow down boost response significantly? Will Auto Cam's help spool a Turbo sooner than Manual Cam's? I suppose the real question is.. These with the Manual Z's, do you find 230-245rwkw lacking? Would you like another 20-30rwkw? I am planning on a non-turbo rear-end swap with a manual going in mine, and feel that 230rwkw might not be enough.
I find that power level just fine for the street especially with a few mods to help to reduce lag (split dumps, good tune etc), even on the track while it wasn't amazing on the straight line it certainly didn't let me down. If I was looking to mod my zed id probably go for handling mods not power
Yeah that's what I was thinking. LS2 HSV's would probably pip a 230rwkw Z in a drag I presume for instance? Lots of modified ones around too.. even S13's etc. with a GT2871R would probably pip a 230rwkw Z till 100+km/hr.
530BB's used to be the go to turbo for the purposes you listed because they were highly responsive yet still put out good power. However, with some of the mods that have been developed you can get that kind of response (or better) with GT28R's (2560 / 600R) Unfortunately I don't have a graph that has the 530BB with identical mods to compare the response of each accurately. That said, you can do the kind of power you are looking for on stock turbos though it will probably be pushing the engine a little harder than you'd like. Lastly, torque of them all: Personally, they're both great turbos and I don't think you would be disappointed with either with appropriate mods. Edit: Scratch that.
Thanks for going out of your way to post that Zductiv. :zlove: According to these graphs, the 530BB's make the same Torque at the same RPM as the Stock Turbo graph, and the torque graph falls at the same RPM around 4800-4900, albeit not as steeply as the stock turbo. I presume the stock turbo graph is of the Sport 500 or similar, or are they just OEM manual turbo's, do you know? That torque graph is a good example of what I'm looking for. Look how much more area under the curve the smaller turbo has compared to the 28r's under 5krpm. 400ftlb's is seen 500rpm sooner. That would be telling on a skid pan. ... Hmm. Are the 530BB's even worth the outlay given they only make slightly more power and shift the torque curve to the right without adding much if any more torque? Or do you believe they are limited up higher by OEM Cams? Is spool even affected negatively by larger duration Cam's? Would I be correct by saying larger duration cams and small-ish turbo's would provide an excellent trade-off, that was the consensus of opinion among 3SGTE owners anyway with their engines.
Awesome power figure Chili, and you're obviously pretty happy with the result of the hi-flows, was there much of a trade off with boost response with the bigger cores? I looks like I'll be going down this path come mid this year. :zlove:
Not enough to be really obvious(maybe 300-400rpm higher up)and that means SFA for street use. Biggest trade off for me was a very bad experience with Garrett in Sydney(if I had to do it again I would use someone like Precision Turbo's). The Garrett experience caused me to need a complete engine rebuild, due to poorly assembled turbo's disintegrating their bearings into the engine oil(goodbye engine).
To be perfectly honest, I don't know what the actual dimensions are of the internals(and following the unsatisfactory nature of the dealings, I doubt I ever will). All I know is that I have 360deg thrust bearings and seals(and the second rebuild has been working without a hitch). What I do know is that following the initial failure, when I went to pick-up the turbo's for the second time, they were having difficulties doing the final assembly. This resulted in me being "signed in" to the Clean Room to see what was going wrong. They could not get the wastegates to go back on(due to the actuator arms not fitting into place)so they suggested customizing some arms to make them fit. I pointed out that "if they fitted before disassembling, then they must still fit afterwards" and if this was not the case, then someone had mixed them up with the wrong parts. They were adamant that this was impossible because "they never work on a pair of turbo's as a set". This proved to be exactly what was wrong, they had mixed the parts of both turbo's(and had subsequently "clocked" both with the others specs).:W: Dis-assembly and reassembling with the correct parts saw everything fit as intended, and they have continued to operate as expected since then. The same can't be said for our mutual respect for each other in regard to future dealings.:bash:
