[Diy_efi] Re: [Diy_efi]

[Bruce]

----- Original Message -----
From: "Kenny" <watson at iamfun.com>
Subject: Re: [Diy_efi] Re: [Diy_efi]
> Quoting Bruce <nacelp at bright.net>:
> > At what cost?.
> > For a 8 PSI application, I really doubt if you
> > could tell from the drivers
> > seat.

> As in, you wouldn't be able to tell the difference
> between 1 or 2 turbos?

Yes.

If that's what you mean then for
> sure. Lag comes into play when you're running a turbo
> with a large compressor trim because you want
> efficiency at high boost, so you compromise. No
> compromise needs to be made at 8psi. You can get a tiny
> turbo to do that (like a mitsu TDo5-12b or 13c, or even
> a little T04). You can size a small turbo because you
> don't need it to do much work. 2 turbos is silly for
> 8psi and high compression. twin turbos are used
> primarily for enhanced drivability in higher boost,
> lower compression cars- and even then they are usuallu
> staged electronically. Once people get serious with
> boost they swap to a single unit.

Ya, just kinda flies in the face of all the logic that says otherwise.
Some Universal Truths just aren't really universal.

Absolutely no reason
> to run 2 turbos for 8psi. Why do you need all that hair
> drier? A single well sized single turbo with the stock
> compression ratio will give a quick, almost lagless
> spool up.

Agreed.

> Sizing is key though.

And as in Real Estate, location is everything.

> My car is a turbo 2.1L
> with a 60 trim T3 and at less than 12 psi it's a wee
> bit big. Ie throttle on just before and apex-> lag->
> boost-> power oversteer that is a little unpredictable
> in the wet. I'm currently turboing a 2.3L volvo and
> keeping it's stock 10.5:1 compression ratio (well,
> it'll be a touch less after the headwork). With a small
> turbo and high cr it will have tremendous bottom end.
> It will likely only see 6 psi. But if I can get the NA
> HP up to nearly 200, that's almost 300hp. Sorry for the
> rabbit trail. Bottom line, anybody who things twin
> turbos is necessary or helpful for 8psi is likely
> incapable of such a project. The exptra expense and
> complexity of running twins would yeild little
> difference. Go single and spend the money you would
> have spent on the second turbo on a valve job and a cam
> and you'll KILL the twin turbo.
> -Kenny

Bruce


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