hey, im pretty new to the 300zx scene i jsut bought a 1993 300zx n/a 2 seater 5 spd about a month ago and had heard several things about supercharging a 300zx and am dying to do so, if money is no object is it physcially possible to supercharge a vgde30 if so can someone please let me knwo a little more about this and were i can get it done thanks

 

Hell when you say If money is no object of course it's possible, anything is possible when money is no object. You can supercharge you 3 clyinder geo metro is money is no issue. For most all people going through the trouble of supercharging your vg30de, money is an object. The only people your gonna see doing that are companies and places with the resources to do it cheap. If money is no option, I'd look more into a single turbo, from what I've heard on the grapevipe a single turbo plenum is being made so that's a more logical idea.

 

Welcome, To me, it seems, that this subject is taboo among Z people. Everybody's gotta have a/do a TT. I'm a fan of the centrifugal style of s/c like the items offered by the first three companies below. I haven't seen a kit for the Z, haven't looked either tho. I would probably try to engineer my own kit utilizing one of these. It could be done for substantially less than a TT swap. I hear that it's common to get 12 - 14 psi of boost from a s/c.


http://www.vortechsuperchargers.com/index1.asp

http://www.paxtonauto.com/about/

http://www.powerdyne.com/silentdr.htm

http://www.kennebell.net/

http://www.jacksonracing.com/

http://www.whipplesuperchargers.com/default.asp

 

I've never seen it done. A problem that you'll run into is lack of room. A supercharger takes up more space than a turbo charger, and as I'm sure you're aware, there's not much room in the engine compartment. The cost of the supercharger may be less than a TT conversion, but when you factor in the time and costs of fabrication, then the s/c may wind up being more expensive. Turbos are much more efficient than s/c's, so if $ is no option, then do a TT swap.

 

Theres actually a single turbo VG on ebay right now. I have no idea where it came from, and I had no idea that they made them single turbo.

http://cgi.ebay.com/ebaymotors/ws/eB...&category=6755

 

VQ man not a VG

 

well actually i know it would be more resourceful to do a twin turbo switch but more than anything i want to have supercharged 300zx i guess part of its jsut me wanting to have something uncommon, so do do that using those links what would i have to do; would the people at vortech be able to tell me how to do it?

 

Considering that money is no object , it's guaranteed that they can build you a kit with installation instructions, or, you can pay, and I'll build us two kits and install them both.

 

so you guys think in total itll cost me bout 5 grand to supercharge it ?

 

Did you see this?

http://www.vortechsuperchargers.com/...3-04_350Z.html

Click on p/n for price. That should give you a good idea of the kit price. The supercharger alone is around $1800. I would do mine for about $3k total.

This would not include ECU mods or standalone, bigger injectors and MAF, etc.

 

Yah, but man isn't he wanting to supercharge a 90-96 Z? That kit is for the 03-04

 

That 350Z is awesome. That's quite a bit more HP than the Greddy TT conversion for the 3.5 VQ, and it's less $. You'll still need to keep in mind that you'll need to get it to fit. There's more room in the 350Z engine compartment. Getting a company to make a custom system for you will probably run a bit more $. I can get the complete setup for my truck for a bit over $4k. It only pumps it up 95 HP and 81 ft/lbs of torque though. Considering it only runs 7psi, that's still pretty good.

 

I was just referring to the price for this kit as a ballpark figure to get a supercharger kit.

Everybody talks about how tight our cars are under the hood, but that is pretty deceptive when you're looking from the top down. I see quite a bit of room down below, like when you look from the bottom up.

Some are my arguments in favor of supercharging vs turbo:
Less complexity
No lag
Capable of 20 psi boost.
Less expensive to engineer your own system.

And your arguments in favor of turbos are:
1) plug and play
2)
3)

 

ok i had one more question for you guys i noticed on some of the conversion topics one of the main reasons a twin trubo conversion on a na vg30de was that the compression was too high compared to the 8:1 of the vg30dett would this cause any trouble for me or would it still be ok? the egine only has 40000 miles on it and my Z only has 60.900 there was an engine replacement at around 20000, so the engine itself is it great shape, also if anyone wanted to check out the z i plan on putting it on here it is .....

http://www.cardomain.com/memberpage/671127

thanks again for all your guys help

 

yes, the compression will limit your boost, just like in a turbo setup. 9psi max and that's pushing it I think. I've seen it done. But the drawback is the dual intake, lack of space and how to run the supercharger since it's belt driven. The solution that always comes to mind is replacing the upper and/or lower plenums. Custom fabricating an intake system isn't easy or cheap. That would be the only way that i could think of to incorporate a supercharger onto a VG30DE. Best bet would be to have a roots style blower mounted on top instead of the vane type that typically is side mounted.

 

Basically turbo/supercharging increases the compression ratio of an engine. You can turbocharge any engine with any compression ratio. You just can't run the same amount of boost pressure.

The jist of this goes something like this; On a given 8:1 c/r engine you can safely run 12 psi of boost and obtain a given h/p number. On the same motor, but having a 9.5:1 c/r you might only safely run 8 psi of boost to achieve the same h/p numbers.

One of the keys to successfully adding boost to a n/a motor or increasing boost on a turbo motor is to closely monitor your air/fuel ratios. ie: add boost until the engine runs too lean and starts to get hot, then add more fuel and air (from larger maf/tb's/injectors/valves), then add more boost until it starts to run lean again. Eventually you reach the limits of your bottom ends ability to handle the increased comppression and you throw a rod out the side of your block. Or you stop at 400 - 500 h/p.

Sorry for rambling........

 

thanks, still a few more questions. this probabley sounds pretty stupid but i have to ask does the "roots style blower mounted on top does that require new heads or how excatly would that mount up would i have to have someone custom fabricate a mount. 2... since it has dual intake would i have to somehow make it a single intake or would i be able to somehow keep the dual intakes. 3... the dumbest of all.... what exactly is the plenums?
thanks again for all your guys help

 

http://www.300zx.co.uk/tech/manual/manual/em/008.gif

go through this manual. but be careful you might learn something.....

 

This applies to turbos and s/c, but if you run too much boost and too high of compression, then you'll either blow a headgasket, or experience an oilpan failure (when you fire a connecting rod through the oil pan.).

Remember the s/c on the car that Vin Diesel wrecked on Fast and the Furious? That was a roots style. The ones you see on 1/4 mile dragsters are also roots style. The ones shown on the vortech site are vein style.

Neither style requires new heads, but the roots style will require a new intake manifold. It would be preferred to convert to a single intake style manifold for the vein as well. That's why the VQ works well with a s/c (single TB).

Another benefit of turbos over s/c's is efficiency. They don't steal horsepower to make horsepower, like the s/c's do. Most people don't have the time, $ or knowledge to be able to accomplish an s/c conversion on these cars. I'm sure that if an s/c truly produced better performance, then someone, somewhere, would be selling a kit. You say you want something unique. This would be unique, but not likely better. If you want to do something unique, pick up an late 60's El Camino and drop a supercharged 350 into it, then retro-fit a Z32 TT rear-end to it so that the thing will turn. That would be unique. Or, even better, take that El Camino and drop a supercharged 502 in the rear end with a V-drive. Thing wouldn't turn worth a damn, but it'd be SCARY fast

 

I haven't seen under the hood of a NA z, but if you're serious about it...Try taking out the Ac, and getting the brackets for the supercharger custom made to match up to them..and just use that to drive the belt...And just run a y from the supercharger to the 2 Tb's...Then just get a new FPR or get someone to remap your ecu...Something to the fuel system..I'm sure it could be done...However someone forgot to mention..You have to run less boost on a supercharger on stock internals...Cause it takes power from the engine, therefore a supercharged and turbo motor, both making 300hp, the supercharged motor is gonna be make a couple psi more boost then the turbo...Most people overlook that. I'd go with one large turbo..

 

OK what about the VG33 engines...the supercharged ones?? I wonder is their plenums are close enough to retro fit one onto a VG30

 

That's a path that I'm heading down for a future project. The vg33 is a single cammer, but I'll be looking into that intake s/c set-up. If I do something like that It'll be built up on a seperate motor and then swapped in when appropo.

I don't even yet know if the vg33 has a distrubutor or is distributor-less. Ideally, I could put the DE heads on the vg33.

Time will tell.....

 

it seems like everyone always thinks of roots style blowers. i would think that a paxton centrifugal type would be easier to integrate into the vg30. pull the A/C, fab some mounts and pipes, and you dont even need a hole in the hood. obviously theres more than that, and i'm not terribly familiar with superchargers so i may be way off the mark, but its just an observation. i've been toying with the idea for my na z31. my stepdad has lots of experience with things like that and thinks its the way to go.

 

I like the centrigugal s/c's too. I had a friend that made a pretty good income by installing them on Stangs and tuning them in. My whole deal is that I'm cheap and I don't see many of the centrifugal s/c's around at a price that I want to pay. On the Eaton s/c's, I can get rebuildable used ones all day long for $200 - $300. The centrifugals are basically a belt driven turbocharger so you'll also have some lag.

 

yeah, a bit pricey, but way easier than turbocharging. and takes up less space under the hood. i think it would be a good replacement for the air conditioner!! i was thinking water/alky injection to overcome the compression problem. but then again, i probably wont get around to it cause as soon as i find a na z32 in the right condition for the right price my cash is going there. maybe i'll save the project for that.