s2d4
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Re:1993 MR2 Turbo - Tuning Stages
2012/10/16 11:04:55
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slower response? isn't it using the same turbine housing?
so with the newer compressor fins design, wouldn't it be more responsive?
Looking at the compressor map, as well as other dyno comparisons so far, it appears GTX series spools faster and loves boost, so higher hp too.
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darius
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Re:1993 MR2 Turbo - Tuning Stages
2012/10/16 11:19:09
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I'm at the "Bolt on" Stage and still very happy with my current setup
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MR2QIK
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Re:1993 MR2 Turbo - Tuning Stages
2012/10/16 11:24:27
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The jury is still out on that one (I've yet to see definitive results although some tuners I've spoken to say it will respond better). I pretty much set the expectation low & it very well may exceed my comment. But at the very least, I'd expect close to GT3076 power with similar spool to a GT3071 
MR2QIK - "The Little Car That Could"  320rwkw @ 19psi (pump fuel, no giggle gas) 11.96 @ 116mph (with 228rwkw)
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MR2QIK
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Re:1993 MR2 Turbo - Tuning Stages
2012/10/16 11:26:00
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Bolt on stage of a Gen3 is more fun than a bolt on Gen2 though. I couldn't live with a CT26, the fact it dies after 6000rpm is an instant annoyance in my books.
MR2QIK - "The Little Car That Could" 320rwkw @ 19psi (pump fuel, no giggle gas) 11.96 @ 116mph (with 228rwkw)
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just_ace
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Re:1993 MR2 Turbo - Tuning Stages
2012/10/16 12:01:28
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gtx all have anti surge housings which as i understand will contribute slightly to lag
gtx have higher efficiency compared to the gt in the higher boost range, however your limited by whatever fuel your running anyway, they'd go well with E85, but with 98oct as most tend to run max 20psi you can't mak full use of the potential.
this is as i understand it.
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MR2QIK
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Re:1993 MR2 Turbo - Tuning Stages
2012/10/16 12:15:23
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^ couldn't have summarised it better myself
MR2QIK - "The Little Car That Could" 320rwkw @ 19psi (pump fuel, no giggle gas) 11.96 @ 116mph (with 228rwkw)
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sredze
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Re:1993 MR2 Turbo - Tuning Stages
2012/10/16 12:41:56
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You guys are going fairly deep in all this aren't you. :) I am on the Gold Coast, and am still doing my research as to the workshop(s) that specialize in MR2 Turbos here in QLD. I guess If i was in Syd, I'd be in luck fairly quick. Currently I am at the bolt-on stage, I would say as I recently got a side-mount intercooler installed and the 3"inch exhaust.
post edited by sredze - 2012/10/16 14:26:54
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s2d4
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Re:1993 MR2 Turbo - Tuning Stages
2012/10/16 14:42:49
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Cheers for the info Ace, You are right, the cars running GTX that I've seen are all on E85.. just_ace
gtx all have anti surge housings which as i understand will contribute slightly to lag
gtx have higher efficiency compared to the gt in the higher boost range, however your limited by whatever fuel your running anyway, they'd go well with E85, but with 98oct as most tend to run max 20psi you can't mak full use of the potential.
this is as i understand it.
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just_ace
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Re:1993 MR2 Turbo - Tuning Stages
2012/10/16 15:00:59
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Road and track (forum sponsors) are in north Ipswich qld. Dunno how close that is to you.
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blacky83
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Re:1993 MR2 Turbo - Tuning Stages
2012/10/16 17:30:42
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What are the limits of the stock intake manifold? Im aware of the uneven distribution, was looking at switching to a sidefeed 3SGE manifold when doing my new cooler piping, as its really cheap, bolt on and meant to flow evenly. Is it worth doing or should I go straight to aftermarket?
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MR PLOW
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Re:1993 MR2 Turbo - Tuning Stages
2012/10/16 19:03:30
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MRTurbo
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Re:1993 MR2 Turbo - Tuning Stages
2012/10/16 23:19:41
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def the CT26 running out of puff after 6000rpm gets tiring after a while...my next plans are first to get rid of the nugget and bolt on a 'CT20B', some sort of CAMS maybe (N/A ones), do a full seal kit inc. HG on the engine, as it's leaking oil from likely the cam and crank seals. then implement a MAP ECU and AFR and IGN tune it properly... which should keep me happy for a while. :)
1990 SW20 GT 3S-GTE Targa 2001 Honda CBR600F4i 
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dylmrt
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Re:1993 MR2 Turbo - Tuning Stages
2012/10/17 00:04:15
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This is the way I got my 250rwkw (probably good for ~280rwkw with better cooling): Staring with a gen3 motor: Rebuilt motor with CP pistons and Eagle Rods 1mm Oversize Ferrea valves Garrett GT3076R twin scroll turbo @ 21psi HKS 264 cams on HKS valve springs Greddy Pro Spec B II EBC Apex'i Power FC & Commander Tuned by HITMAN Berk Technologies Dump pipe Hi-Tech Mufflers' 3" Exhaust Apex'i Air Pod Border top mount intercooler 800cc SARD injectors Walbro GSS341 fuel pump If I could do it again, i'd swap the GT3076R with a GTX3071 (still might do this). I'd hit the same power ~250rwkw but it would come on boost earlier and generally have more area under the power curve. 
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TRD2000
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Re:1993 MR2 Turbo - Tuning Stages
2012/10/17 08:08:52
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im not sure that you need to play with valve sizes to achieve 300kw.
longer duration cams with standard lift should do the trick and allow you to run higher boost without problems associated with inlet pressures opening valves. going up in valve size increases the pressure on the valve springs and means they'll degrade faster and start lifting off the cams as high rpm.
i guess you could choose.
do the valves and run lower pressure.... or a turbo that spools quicker but doesn't hold peak pressure at high rpm so is effectively lower.
or,
run a turbo that can produce 20psi at high rpm and increase the opening duration but not the valve size.
the stock gen 2 head and cams are good for 200+ kw @ 14psi and about 6500rpm
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MR2QIK
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Re:1993 MR2 Turbo - Tuning Stages
2012/10/17 09:19:22
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Personally, unless going hardcore (ie 400rwkw+), I don't see the need for oversized valves. Given there's been quite a few documented issues with Ferrea valves I don't see the need to take the risk for a marginal improvement. There are examples of standard valves on 800hp applications (eg MR2Liter in the States).
MR2QIK - "The Little Car That Could" 320rwkw @ 19psi (pump fuel, no giggle gas) 11.96 @ 116mph (with 228rwkw)
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