Question for you turbo experts

[Efraim]

Hi Robert,
I would let turbo experts answer your questions, but I have three questions
for you.
First, why would you replace R/Z mod with a chip? What was your rational
behind this? I know many people who are quite happy with R/Z. Is chip
solution so much better to justify a cost of replacement?
Second, I heard that cars with 1.8 bar mod must use 94 octane gas to prevent
knocking. 94 gas presumably runs much cooler and allows to utilize full
potential of this mod. True or false?
Third, did you reinforce your intercooler in any way to prevent bursting
under max boost conditions?
Thanks,
Efraim
'88 5KCDTQ (Canadian)  319K km (198K mi)
'90 90 96K km (60K mi)

----- Original Message -----
From: "Beatty, Robert" <BeattyR at ummhc.org>
To: <quattro at audifans.com>
Sent: August 21, 2000 11:32 AM
Subject: Question for you turbo experts


> Couple of turbo questions for those of you that have alot of knowledge
about
> them....
>
> I currently own a 87 5k tq with Scott M's eprom mod and a 1.8 bar spring.
> ATP slotted rotors and metallic pads.  Car is otherwise bone stock
> mechanically.
>
> I had an R/Z ECU mod previously and while it was in at one point just
before
> i took it out, I noticed what seemed to be a power drop.  I have run codes
> and checked various things and since then I have also pulled the head to
> repair the exhaust manifold and engine mount.  The car was running at the
> normal 1.3 bar (US) during the past few weeks while waiting to send out my
> puter to Scott and was running fine.  I have put the ECU mod in and while
i
> was replacing the stock spring with the 1.8 bar spring, I found a small
> amount of oil under the waste gate cap on the diaphragm.  I also have only
> seen 1.8 very briefly as well.  I will be re-verfying WOT switch as well.
>
> questions are....
>
> 1.  Is a slight amount of oil at the outer side of the W/G diaphragm
normal
> or is it a indication of a slight tear in my W/G manifold.... would a tear
> cause a slight power drop or would it be much more significant?
>
> 2.  If i was to consider a turbo upgrade, what would I be looking for to
> decrease turbo lag?  A smaller turbo such as a K24? Or a hybrid?  Of which
i
> have no knowledge.  Essentially I am not racing this car just driving it
on
> the street, however i would like a bit faster acceleration then it
currently
> has.
>
> 3.  What specifically makes one turbo different from another ie... a
smaller
> turbo reduces lag correct?  what gains does one get from a larger turbo?
> and what is a hybrid specifically?
>
> Thanks
>
> Rob
>
>
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