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107,695 Posts
Discussion Starter · #1 ·
Hey if I put a Nismo header good flowing exhaust, K&N intake filters, Tune My SU's really good andport match my intake manifold HOW MUCH HP will i get out of my Car which is a 73 240Z???????

107,695 Posts
Discussion Starter · #3 ·
> Probably 170-175hp GROSS if you are using
> the earlier carbs. You will probably get
> 130hp at the wheels.

Ian, hey how much HP do i get right now to my wheels and how much of an impact is noticable with that setup??????

My car is stock 73 crap except the carbs..

Dustin Morris

107,695 Posts
Discussion Starter · #5 ·
> Dustin,
> I have worked with a few Z's on a dyno jet,
> from stock to modified heavily. To start,
> with stock carbs, stock cam, K&N
> filter....etc.... The header will make
> little to no difference. A guy on the IZCC
> mailing list who races ITS 240Z cars tested
> several headers and the stock manifolds to
> see what a difference it makes. Now these
> are basicly 240 motors that are producing
> near tops in hp for a stocker. They must
> have 240 carbs, you can run any manifold you
> want, but everyone runs the stock manifold.
> You can port match the intake/head. No
> porting/polishing may be done. the head,
> etc.. must be all stock. You can run any
> exhaust you want. So basicly it is an
> optimized stock setup. It turns out that the
> stock manifold does very well, especially if
> it is port matched,(easy to do). The best
> header,(or one of the top two, the other is
> no longer available), was the NISSAN
> Motorsports, or NISMO, large diameter
> header. It was something like 5hp over stock
> in some areas, but only 2hp peak difference.
> Similar for torque. That does not justify
> the 300 cost of the NISMO headers. I am not
> knocking them, for I am running those exact
> headers. But to really get the benifit of a
> header, any header, you need a cam, and at
> least port match the intake/head and the
> head/exhaust. I would reccomend a very mild
> cam, especially if it is to only be street
> driven. The first or second cam that
> Motorsport Auto carries are excellent. They
> are made by Schneider, a well respected
> grinder of cams.
> But a stock manifold, matched to the head,
> with a fabricated exhaust from the manifold
> back is the best bet for a mostly stocker.
> Stay away from the Motorsport Auto headers,
> and even the Monza. The stock manifold is
> just as good. The advantage of the stock
> manifold lessens with a cam, etc...
> Bottom line, what power? Stock, likely
> 115-120 in great tune for a 240. With a
> header, mild cam, and what I said above,
> 130-135. That may not seem like much, but it
> is a huge diffence in the way the car feels.
> The power quoted is at the wheels. The guy
> who did the tests on the ITS car, took a
> baseline each day, back with the original
> system, etc... so his tests were fair and
> accurate.
> -Bob Hanvey

Why do you specifically recommend not using the Motorsports header? Is there one that you would recommend? I'm running the Motorsport with 2.5 exhaust attached to a 2.8l, E-31 head with 280 valves, Schneider cam, 3xDCOE40's, lightened flywheel, 280 CD Distr, Crane HI-6 & PS-91. I gotta think think the exhaust helps!
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