SparkleCityHop

iTrader: (30)

The $100-$150 mark is the "sweet spot" for selling a mod to the average tuner crowd. Even high school kids can save up that much money and get excited about buying it, so your market for potential buyers is pretty large at that point.

Good luck!

Voboy

iTrader: (58)

op, curious how you kept the strut bar rust free?

Wasso

Sorry I try my hardest to work with American language, like Color and Colour, Anodised and Anodized. I had used correct term in my first post but it's not that easy remembering lol.


Agreed Sparkle its a win win situation - problem is the amount of Z's (We call them Zed's (Alberto)) is far lesser than that of the States, so it won't make me rich but line my pocket for my SC build.

@ Voboy - I use a steel lacquer, around $15 a can.

FATPUBUS

iTrader: (30)

Nice bay!

Waiz

iTrader: (57)

Looks like there is enough interest for you to do this OP.

Be advised that you will need to be a forum sponsor in order to offer this for sale on the forum though

Fixed

Wasso

I'm afraid I won't be offering this service to our friends across the pond. This was purely an exercise to get advice. In the UK we mod, and mod well, but our limitations to aftermarket parts, resource and information is limited. So this was purely to get the opinions of shall we say the more experienced Z crowd.

Sounds a bit cheeky I suppose but you'll get the right info here on my350 or G35. To be fair I'm signed up to 5 forums in America, for parts sourcing and info.

Te catch can you see in the pic actually resided on a G35 username JDM_Cain and his bay is my inspiration along with 4 others.

If there was interest from these spacers in America I'd gladly sign up for sponsoring the site, as I also sponsor the UK Site.

I'll get the production setup and post a feeler thread on here and if suitable interest and it can be done without too much cost in terms of exporting then I'll give you guys a shout.

Cheers one and all

TunerMax

iTrader: (2)

My thoughts precisely.

The entire premise of this spacer is to COOL the intake charge in comparison to stock. This is where the power is gained primarily.

This is acheived by putting a poor heat conductor inbetween the Intake Manifolds and head to lower the transfer of heat from the engine into the intake manifold, thusly keeping intake temperatures lower, allowing more charge air in the intake runners (colder = denser) and increasing output.

So if you put aluminum there the entire point of this mod is gone, completely.

F2CMaDMaXX

iTrader: (2)

I'm sorry but this is completely incorrect

The whole point of the spacer is to correct the design flaw in the original upper plenum. It slopes towards to the front, not giving enough space for the front two cylinders to get enough air, particularly at higher RPM. I noticed that the engine felt breathless and rough between 4k and 6k before the spacer.


In the case of Motordyne, they have a thermal kit, consisting of an Aramid gasket between the *lower* plenum and the intake runners. As well as that, it contains one of the following;

A simple 'tap' to shut off coolant flow to the throttle body, or a copper sandwich plate, which insulates the *upper* plenum from the throttle body but still allows the throttle body to be heated.



Two points of note;

1) I installed my copper iso setup yesterday, ran the engine up very warm until the engine was 'tinking' as it cooled. The plenum was practically stone cold, whilst the throttle body was pretty warm, the rest of the engine bay was stinking hot. It took an hour of the car sitting there, engine off, cooling down before the plenum heated up.

2) I believe Motordyne are about to release an anodised (i'm British!) option on their spacer (if the pics on their FB page are anything to go off!)

TunerMax

iTrader: (2)

Well, I've been 'learned'!

SO the spacer is tapered?

F2CMaDMaXX

iTrader: (2)

No, just the upper plenum, its more space all round.

TunerMax

iTrader: (2)

Cool thanks for the info.

Personally I feel that's not really the cause for the bulk of the increase., before you dismiss my insolence away let me explain why I "THINK" this:

The IM is designed tapered for a reason, to create a venturi effect that speeds the airflow toward the front 2 cylinders, this effect creates more even air flow to the front cylinders.
So by raising it you're increasing overall volume more than you are changing the characteristics of the design or the way the air gets to the front cylinders.

If the suggestion is this is making the gains by adding volume, that is possible. But it's much, much more likely that the gains are in bulk because of heat dissipation rather than volume.

This is evident in the barely notable difference between a 5/16" and a 5/8" spacer. Rather, it's the MATERIAL that it's made out of that seems to make the most differnce here. Further eluding to the fact that this is due to temperature more than volume.

F2CMaDMaXX

iTrader: (2)

Interesting, however;

It has nothing to do with heat.

It does increase the volume, it still remains angled, so you still get your venturi, but the gap was too small at the front, it starved the front cylinders.

There is an optimal amount, it's 5/16ths, the 1/2 inch also works, but it doesn't gain as much at the low end, but it's slightly more power at the top end. Trade off.

ryanm8

iTrader: (2)

I'm sure there would still be gains with an aluminum spacer, but a non-conducting one is still better. Probably only a difference of a couple hp, but there's no doubt an aluminum one will heat the upper plenum more. And temperature makes a big difference in performance.

F2CMaDMaXX

iTrader: (2)

Don't forget, the TB is heated and that heats the upper plenum very well on it's own

TunerMax

iTrader: (2)

A little research on the VQ35 in the FWD applications would show that this same spacer idea presents the SAME results. Those applications employ a completely different IM design that doesn't suffer from any suspected front cylinder starvation.

And in that application too, the 5/16" and a 5/8" make little difference to one another. Again, the specific material is what makes the difference.

Same engine, differnet IM, same spacer concept. Kind of hard to buy into the whole front 2 cylinders being starved for air.

Buying into a substantial, PROVEN, drastic change in charge air temperature, well THAT is easy to believe.

I'm obviously missing the literature and testing that led to this conception, and I'd love to read it so I can better understand, any links?

Agree.

Yup. TB bypass is a great mod for performance for just this reason. Likewise with thermal spacers.