[Diy_efi] This turbo assist stuff, suggestions

[efi student]

How about apples to apples.  Same wheels, same housings, BB cartridge =
vs.
plain.  Do you have experience with this?  Our experience with 3 liter =
I-6
Supras says BB is just a fashion statement as do a number of reputable
sources in the industry.  Do you have hard data that suggests otherwise?

Lance

-----Original Message-----
From: diy_efi-admin at diy-efi.org [mailto:diy_efi-admin at diy-efi.org] On =
Behalf
Of Matt Porritt
Sent: Tuesday, December 31, 2002 4:28 PM
To: DIY-EFI
Subject: Re: [Diy_efi] This turbo assist stuff, suggestions


Same wheels with a BB core shows a marked increase in spool over std.. =
on
the GT range of turbos anyway.

The exh wheels on the GTs are very nice.. They almost look like they =
should
be laggy (well.. They do look like they are laggy)

T beauty of this turbo conversion I did on a customers car is that we
replaced the std T28 (GTiR Sr20) with a Gt25 with a BIG T04S comp wheel =
and
a smaller exhaust housing (due to more pitch on exh wheel and 1 less =
blade
and also the backcut design of the wheel)

The car spools very well down low, better than std, BUT the top end is
amazing. There is no hint of the turbo starting to fall off, even at
7000rpm. Some will say that this is a mismatched turbo (like the HKS =
2540)
and won't work, but  its been proved time and time again, BB, big comp =
and
right choice of exh housing will give results that have to be witnessed =
to
believe.
--=20
Matt Porritt
RC Race Cars and Supplies
ICQ #22776813


On 1/1/03 1:09 PM Grant Beaty wrote

> Does anyone have any proof that BB bearings actually help? Quite a few =

> Supra people have experience with the single BB turbos from=20
> turbonetics (one BB, one standard bearing), and they all report the=20
> exact same spool as a standard bearing turbo.
>=20
> I can't wait until people start to use the GT-series wheels. The=20
> compressors look a little better, but I guess we can expect big gains=20
> in spool from the hot side?
>=20
> I agree, 7 psi by 2200 is too damn fast ;) I'll take more top-end,=20
> thank you!


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