Eddie,
What turbo are you using, still the T3? How did you go with that idler clearance
problem? Hope you had the turbo high flowed.Having another manifold made can be
quite expensive and making it yourself can be time consuming.A lot would depend
on what HP you turbo is rated at or if you intend to go bigger later although I
think the standard manifold is capable of flowing enough for at least 400HP.Any
more HP than this I would be looking at an external waste gate type set up and
therefore another manifold.The standard manifold will keep air speed high and
combine with the high exhaust pulses the FJ20's produce allow for quick spool
up.A larger dia manifold is usually used when ultimate HP is being chased or if
the standard one is to small or if you change to different bolt pattern.I ran a
TB34 400HP unit on an FJ20 with no back pressure problems at all.Theses units
were designed by Nissan for there domestic racing where no external waste gates
were allowed and standard manifolds retained. These turbos featured a turbine
housing with a larger nozzle area and a -61 turbine wheel. These are only my
experiences anyway maybe some others have had problems with the standard
manifold.While you were getting your turbo done did you come across any
workshops with any used -61 turbine wheels as I think thats what they used in
the RS500 Cossies.
Andrew Smith
[EMAIL PROTECTED] wrote:
> I'm wondering what the limitations are in respect to power potential using
> the stock exhaust manifold on my FJ turbo( It's a Gazelle RS-X manifold). Is
> it worth me getting an aftermarket one now? The reason I ask is because I
> get my new turbo this week and them it will be time to get the exhaust
> system fabricated. I don't want to have to have it done twice if I find I
> need a better manifold in the future. I'd rather just spend the money now
> and do it right. Any idea, anyone?
>
> Cheers,
> Eddie
> England
> 1969 510 4door
> [EMAIL PROTECTED]
> www.ratdat.com
>
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