Z1 headers + Motordyne Manifold

slam1918

For anyone interested: i was at Horsepower Logic and had Jack make a few pulls.
The previous readings of 267WHP was with Sillen CAI & CBE on hi test pump gas.
Todays run showed 286WHP with the addition of Z1ported plenum & Z1 Hi Flow Cat.
Jack was not very high on the ported plenum. He said he had tested a bunch of em and none had shown any power gains. He said the prior pull was a bit under what other Z's run with the G3 & CBI. He also said 286 is a fairly normal reading for the mods I've done.
IMO...I would hold on the ported plenum and put the money toward the suspension.

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DEpointfive0

How many is "a bunch" and I think your gains are good.

HFCs after you added a CBE isn't going to account for much. And when was your last dyno run? How was the weather in comparison to most recently?

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slam1918

We didn't get into specific's on the number he'd done. But he seemed a bit biased as soon as I mentioned it. He thought I waisted the $$$. Risk vs reward, I got no regrets. Not much else for me to do other than forced air & I'll hold on that.
As far as temp & humidity, hell it's south florida....it's alway 85+ 95% humidity
As I remember the last time on the dyno was Sept 2012. I will say today the humidity was a wee bit lower than usual as we had a front come thru.

Megan370z

Not too surprise on the intake manifold.

they probably went a bit light on the production intake manifd porting since they made a piece for their shop car.....

If anybody search more deeply into this. They will discorver the first pictures of that intake manifold had a lot of porting done to it by the runner entry vs some production unit that some guys showed picture which had barely any porting sign as in comparison of their first one.

Dont get me wrong they are probably doing it by safety of not scrapping the unit by making a hole it it and having to do some repair after....

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slam1918

hey Black_, from first hand knowledge the trick to these motors is getting cool clean air in & out as quickly & efficiently as possible. There seems to be a wide variety of opinions on headers. It seems headers will sacrifice low end power and you will loose some off the line ummff for top end performance. That's why I went with stock manifolds and the HFC's to the Stillen exhaust. Across the board everyone seems to agree (rare for any forum) the stillen G3 is the best intake and will give you good hp gains for the $$ spent. As far as the exhaust I liked the sound of the Stillen and the fact they add some weight in the *** end made sense since many people say the car is a bit light in the rear.
I went for the Z1 intake kinda blind as this my first go round with a plastic intake. I'm way more familiar with aluminum that has an e on it. If you don't know what your doing and start hacking away on your intake you can wind up going backwards and decreasing the air flow and power output. Unless you have gobs of experience or a flow bench that can measure air flow you just guessing. I figured what the hell for the $$ it's way cheaper than a motodyne & better than taking a stab in the plasitc.

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