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Dkne Extractors

SHANE666

By SHANE666,
in Engines & Forced Induction

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Grunta Enthusiast

Grunta

Posted
Posted

Well, I dont really see the point of the before dyno,

its completely stock, and I mean completely.

And depends on how much a dyno costs. it would be nice to know, but knowing doesnt make the car go any faster.

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SHANE666 Mentor

SHANE666

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depends where you go...

well, then no point for a dyno i think. if you have a completely stock non-turbo, i guess you could run off specs.

say 147kw/96rwkw? Or however much power the gt-v holds.

Grunta Enthusiast

Grunta

Posted
Posted

They are made for the R34, but will fit any other RB25 motor. Not sure if the RB20 is the same design or not.

So if you have a R34, they are a good option.

Not sure if the cobys were designed around a particular model or not.

Vik Mentor

Vik

Posted
Posted

How much would it cost to install the extractors ? EUG or Shane, got any ideas?

Because i would be pretty interested, but i doubt i'll be hitting it up in a group buy, because whenever there is a group buy im short on the dosh, but when there isnt i got an influx of it in my back pocket lol.

MRXTCZ

Grunta Enthusiast

Grunta

Posted
Posted

It would probably take about 2 hours to fit. so allow at least $200.

You could also try it yourself, no welding required for fitting the extractors for the 34's, all bolts. Just be careful not to snap any of the bolts on the side of your block.

SHANE666 Mentor

SHANE666

Posted
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dont think there's a need to take out the engine lol.

going to wait for Trevor's results then make a decision on a possible group buy.

Trev, i'll try and go through with you all the points that Eug raised earlier so i can post em up in here, or if you're keen just throw us some feedback.

Cheers.

Grunta Enthusiast

Grunta

Posted
Posted
Ohh. is it just bolts?

Do i need to crane the engine out to get them in? If not i'll do it myself and get my dad to give me a hand aswell!

thats great news lol!

MRXTCZ

LawL, god no, you dont need to lift the engine out, that would take you all day just to disconnect everything.

take out the airbox and all connecting pipes, then you should be able to see the current exhaust manifold covered in a heat shield, take the heat shield off, undo the cat first. (good idea to use some ramps or at least a jack and supports).

I think there is some stuff you can put on the bolts that will help lossen them. it also helps to tighten the bolts slightly before you try to untigthen them.

once its all off, clean up the block with a wire brush, or better still get a drill attachment wire brush.

replace and rusted nuts. if you have the tools you can replace any rusted studs as well.

you can also use some high temp gasket goo on the gaskets to give a good seal.

Vik Mentor

Vik

Posted
Posted

Bloody oath!

This thing is friggin massive and deafening man!

I need to get a smaller cat back. 2.5 or 2.25 hmm.

Need to get that before i even thing bout getting extractors on mah ride.

I saw the extractors on ebay aswell.

MRXTCZ

GTS4WD Grand Master

GTS4WD

Posted
Posted
What do you reckon the power advantage would be like? (kw wise)

MRXTCZ

Theres a fair bit more down low toque.. The engine is happyier to be at lower RPM.

I also noticed that the engine reved out quicker and a little harder.

There wasn't much top end again. So there wont be much of a "kw" gain as there isn't much (if any) top end gain where the "peak kw power" is recorded.

It will however give you more responce and a slightly wider power band. You will be able to the diffrence on a dyno sheet. The curve will "bulge" earlier (giving you more torque) where there previously wasn't.

Dont expect too much from it. Do bear in mind that it is only a small section of the exhaust. Your whole exhaust is as good as its worst bit. You may find that the rest of the exhaust system will need to be replaced with a better flowing mandrel bent 2.5 system to see the full gain of the extractors.

P.s. I noticed that the exhaust became a little quiter aswell. Other users have reported otherwise though.

Vik Mentor

Vik

Posted
Posted

Ahh i see, cheers for the info man.

Well, i really wasnt expecting much anyways, im thinking i'll start from the top and work my way down for the exhaust. Extractors, CAT, then cat back.

Hmm, should be seeing some gains, coz i knw for a fact im loosing power / compression with the massive 3 or 4" i got on the NA right now. Waiting for my group certificate and lovely tax return hehe!

MRXTCZ

N-DAWG Mentor

N-DAWG

Posted
Posted
Waiting for my group certificate and lovely tax return hehe!

MRXTCZ

Aren't we all!! :) I'll probably get the whole exhaust system done in one go, once that lovely tax return comes through hehe

I'm still keen to see the results of these DKNE extractors though.

Getting more top end power is good, but for daily driving, I'd prefer having more useable power and better response.

Eug Grand Master

Eug

Posted
Posted

keep in mind guys that top end power can be achieved with a larger exhaust, which means more air is required to attain optimal exhaust efficiency. more air = more revs. unless you are revving out to 6-7000rpm daily i doubt you'd make use of the high power reading.

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