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 :mad: 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 :cool:

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.

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.

LOL! You're absolutely nuts... but then again, aren't we all? :D :cool: ;)

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?

Yes we are Merv, like you didnt know that.

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 :D

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?

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.

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?

I think you can order them and as far down as 5psi springs
28Rs will be lots of fun