The GA16 is pretty limited on injector sizing which
will hold the safe power to about 140 wheel hp or so.
with a bigger fuel pump and a fuel pressure riser, it
is posible to perhaps have a slightly bigger margin of
safety.
As far as the other questions, I don't know, I have
not done it yet. The GA16 is pretty resistant to
detonation so maybe you can get away with setting the
timing at 5 degrees btdc.
This is all a guess on my part because I have not done
any turbo GA work yet.
Mike
--- "Marlon K. Gokim" <[EMAIL PROTECTED]> wrote:
> I just want to ask those who have extensive
> experience with tuning a GA16
> motor for forced induction (i.e. turbo) like Mike
> Kojima because I have a
> custom turbo kit which includes a Garrett T25 turbo
> with intercooler,
> blow-off valve, fuel pressure riser, etc. which I
> got from my friend's '95
> Nissan Sentra. I'm planning to install it to my '95
> Sentra. My current
> mods include intake, headers, UR pulley, lightened
> flywheel, and an APexi
> SAFC. My problem is I don't have access to JWT ECU,
> which I am fully aware
> you highly recommend because I'm in the Philippines
> and it would really be
> difficult to have it reprogrammed by JWT. My
> friend's car ran quite fast
> even without the ECU reprogrammed. He had the turbo
> on his car for more
> than 2 years without any major mechanical problems.
>
> I just want to get your opinion and advice because
> I'm already planning to
> install the kit next month. If you guys could give
> tips on PROPER TUNING
> (i.e. how many degrees to be set for the timing,
> etc.) to avoid DETONATION
> and others things which I should do before I run the
> car, I would greatly
> appreciate it! I don't have access to a dyno here.
> Is it okay if I go with
> 2.5" exhaust piping from the turbo to the muffler
> since we don't have any
> regulations here re: cat back system? Will the Apex
> SAFC and the fuel
> pressure riser suffice for the fuel enrichment in
> place of the JWT ECU since
> the T25 turbo is not too big anyway and I'll just be
> running the car at
> minimum boost, 6-7psi only? Does anybody know the
> best setting of the Apex
> SAFC for the GA16 with turbo? Should I set the fuel
> leaner at higher rpm or
> which rpm range should have the most fuel input?
> etc.
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