Turbo Pt. 3 Draw Thru

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Message: 3        
   Date: Mon, 14 Feb 2005 14:31:53 -0000
   From: "david brode" <dbrode@xxxxxxxxxxxxxx>
Subject: Re: a few questions about turboing my slantsix

Neat little car there.

Randy mentioned the drawthrough carb'd 301 turbos. They are 
similar
in design to the old 231 buick turbos, only larger. Fyi - the comp
side has a .60 A/R housing, a T4 back plate and the wheel is an 
odd
GM only 2.710" on the major [vs 2.75" on std T4 garretts]. Can't
remember the minor, but it's a good bit bigger than the minor on
an '86/'87 GN turbo's wheel. The 301 turbos are supposed to be 
good
for 300-330 horse worth of air, according to several experts that
I've asked. Beware though, the turbine housing A/R is .82. Might 
be a
tad slow to spool on a 225". Fyi - the carb'd 231 turbos have a .42
A/R comp hsg, and a T3 size compressor wheel [another odd GM 
only
wheel, rumored to be near a 60 trim in flow]. The '78-'81s are also 
a
large-ish .82 turbine A/R, and the '82/'83 have a .63, like the later
efi'd buick turbos. 

Fyi - a have chatted with a fellow that used a little 50 trim
compressor /.48 A/R turbine 2.2 mopar turbo on a 225, and he 
said it
pulled well to 5500.

More fyi - there are 60 trim, .63 A/R turbine side T3s on some
Nissans. They are very similar to the 60 trim efi ford turbos, except
the comp hsg in hose in/out, and the exhaust outlet is different 
than
the fords.

Imo, a 500-600 carb would suit you for drawthrough. For 
blowthrough,
imo, it would not need to be that large. Although a 4 barrel might 
be
easier to tune for good economy, a 350 cfm 2 barrel holley might 
be
more than enough, and the holley looks easier to mod for blow
through. Gary Sypherd has info on blow through mods for the 
edelbrock
carbs in the files here, iirc. He's using a 600 edel carb on a 413"
sbc with very impressive results.
Dave
p.s. - you can see pics of slants with turbos mounted on them at
www.slantsix.org


>
> I am planning to use 0.030 oversize forged pistons cr about 8.4 
to 1
> custom made headers
>
> I already have oversizze stainless steel valves ... also going to
> use electronic distributor with an msd 6al
>
> I am wanting to run at leat 12 psi boost at max
>
> would an edelbrock 500 work good in a blow thru setup?
>
> turbo's I can get here are more easily are the 300zx and the
skyline
> turbo's
>
> any help would be appreciated
>
> pics of my car if anyone is interested
> http://www.cardomain.com/id/lncognito


             Brien.
         NEW YORK
   eagle registry #501
eagle kammback registry


15 Tue 9:30
             Brien.
         NEW YORK
   eagle registry #501
eagle kammback registry


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