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WydRyd's Avatar
 
Join Date: Mar 2002
Posts: 3,563
Hi Luke. The SPEC is alright... if I had to do it again, I would go for a Kennedy KEP G50 solution. The SPEC is still a b!tch in traffic and it takes an educated foot to take off without looking like a complete *****. I'd say 85% of the time I can engage it fairly smoothly, but if I'm in a rush and let it out too quickly, the car bucks viciously I'd recommend a Kennedy solution over the SPEC.

Mind you, the SPEC will hold anything you throw at it. I've run her up to 1.3bar and I get absolutely zero slipage

James, Luke is right, the GT28R's would be a very nice path to take. Are you intending to use external gates or integral? The GT28R's don't come externally gated. Only the GT28RS's do.
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Merv
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
Old 03-06-2007, 02:14 PM
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Merv- I aspire to a Gt-40r, Right now I have a "37R" which is really a dual ball bearing pt-67. Next year when I do JE's and LN cyls. I run a 40R and enjoy wheelspin.
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Kris @ Tech9
86' 930/GT-40R Sold
94' Rustang GT daily (long gone)
2008 C6/Z51 Corvette
Old 03-06-2007, 05:59 PM
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Quote:
Originally posted by 930gt-40r
Next year when I do JE's and LN cyls. I run a 40R and enjoy wheelspin.
LOL! You're absolutely nuts... but then again, aren't we all?
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Merv
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
Old 03-06-2007, 07:03 PM
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Twins are more fun!
 
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I'm planning to use a pair of TiAL 38mm external gates, so I guess I'm limited to the GT28RS units, right?

How reliable are the integral gated turbo's? I hear they tend to introduce boost spikes at high boost levels? Not that I'm planning to run mega boost anyway... I plan to run at max, 1.0 - 1.1 bar when I eventually go with proper turbo P&C's & ARP studs etc.

What do you guru's think?
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Carrera TT

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Old 03-06-2007, 07:45 PM
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Yes we are Merv, like you didnt know that.
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Kris @ Tech9
86' 930/GT-40R Sold
94' Rustang GT daily (long gone)
2008 C6/Z51 Corvette
Old 03-06-2007, 10:25 PM
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James,

If you already have the 38's, then by all means run them. I don't think anyone argues that external isn't the better option because you can properly size them and achieve greater flows and you have to assume a $400 WG is better than an internal in a $800 turbo. To make a blanket statement that internal won't vent off at high boosts is probably over simplifying and I would suggest its going to depend on the independent turbo design. Size is the issue and port flow in an internal WG with possibility of more turbulence in the exh housing.

And as you suggest, few of us are running "high" boost. Have you mapped out the piping, because ext. WG certainly makes things a lot tighter back there unless you plan to vent to atmosphere and HEAH why not

Your going to run an electronic boost controller anyway to improve boost control and help hold that gate shut without leakage in any case, correct?
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Luke S.
72 RS spirit 2.7mfi, 73 3.2 Hotrod on steelies, 76 993 3.3efi TT, 86 trackrat, 91 C4s widebody,02 OLA winning 6GT2, 07 997TT, 72 914 v803996TT
Old 03-07-2007, 04:02 PM
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That's right, Luke... I plan to eventually run an EBC, but for now, it's 100% bolt-on and I'm limiting boost to 0.7bar in the 38mm w/gates.
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James
Carrera TT

(3.3, Protomotive MAP ECU, EFI, GT2 EVO CAMs, Twin Plugged, Twin Turbo's)
Old 03-07-2007, 04:08 PM
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Just thought I'd revisit this thread.

Can the GT28R's be pre-ordered with the integral gate preset or pre-configured to whatever boost level is desired?

If I do all of this at the same time as slipping in some turbo P&C's, I'm thinking I might just get the GT28R's preset to 1.1bar. Also saves me from butchering nice 993TT headers for external gates.

Advice anyone?
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James
Carrera TT

(3.3, Protomotive MAP ECU, EFI, GT2 EVO CAMs, Twin Plugged, Twin Turbo's)

Last edited by JMA-RUF; 04-12-2007 at 09:22 PM..
Old 04-12-2007, 09:16 PM
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I think you can order them and as far down as 5psi springs
28Rs will be lots of fun
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86' 930/GT-40R Sold
94' Rustang GT daily (long gone)
2008 C6/Z51 Corvette
Old 04-12-2007, 10:26 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #29 (permalink)
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