Externals fitted

[taupodrifta]

finally got the twin externals fitted. Rear gate hasnt matched up properly so has small exhaust leek to fix but what a different. the pick up is way better and will hols 16psi on a flat road but put it in 4th up a hill and boost cut big time. few things to sort out will stabilising boost and next is major service of all oils should be good for palmy meet and taupo track day. May have to look into some better brakes for them lol/Banana

[bradc]

pics :)

[taupodrifta]

will have to get photos of the rear one when i put it back over my parents pit to fix exhaust leak

[CANDEE]

Are they on the std turbos? I think UC had externals on his factory turbos and had issues with them working properly...

J

[taupodrifta]

Are they on the std turbos? I think UC had externals on his factory turbos and had issues with them working properly...

J
Yeah standard turbos and they seem to be working ok rear one comes in slighty later due to exhaust leak which i have to fix

[Turbo_Steve]

Interesting: No +ve pressure side on them.
What have you done with the standard internal wastegates: wired them shut, welded them, or simply disconnected them?

Technically, the additional pipework should actually increase your spool time a little. Maybe. :) Were your standard wastegates "weak", slowing down your spool, or was it simply the standard gas flow design problem?

[taupodrifta]

Interesting: No +ve pressure side on them.
What have you done with the standard internal wastegates: wired them shut, welded them, or simply disconnected them?

Technically, the additional pipework should actually increase your spool time a little. Maybe. :) Were your standard wastegates "weak", slowing down your spool, or was it simply the standard gas flow design problem?
the factory wastgates have been welded shut and it hits 14psi boost an 3300rpm and only drops to 11psi so they spool up pretty nicely

[Turbo_Steve]

Well, they look pretty tasty in there, if a little crowded. Nice one.

[taupodrifta]

Well, they look pretty tasty in there, if a little crowded. Nice one.
crowded not even the word as you can see i also fitted the radiator from donor car as the wastegate has put a rub mark in it and didnt want to stuff my good one. the rear one is even worse. After fitting it i wish i had have pulled the transfer case out to do it. it will stay like this for a little bit as now looking at changing to custom manifolds and t3's off a rb25det skyline

[Turbo_Steve]

I'd avoid the Skyline turbos, and go for something a little more....specialist, if you can. T25 exhaust housing all ported out nicely will accept a GT27 compressor housing, and spool pretty darn well with it, but go on to make silly flow rates.

[taupodrifta]

I'd avoid the Skyline turbos, and go for something a little more....specialist, if you can. T25 exhaust housing all ported out nicely will accept a GT27 compressor housing, and spool pretty darn well with it, but go on to make silly flow rates.
why do you reckon to avoid skyline turbo??? and what about just using a straight t25 or wouldn't it be enough for our engines

[Turbo_Steve]

I have a pair of T25s and I wouldn't fit them....TD03 is a much more modern and capable design.

I might need correcting here, but the two types of T3 syline turbo I have seen are either the older ones, which aren't particularly spool friendly and don't have a massive spool advantage, or the new ones with the ceramics and don't like going over 1Bar: On our engine, you WILL be going over 1Bar.

I will check, as now I think about it I may be having a "bad memory moment".

[AlanDITD]

Look really good them mate. Top work.

I take it any boost spikes there were have now gone?

[taupodrifta]

Look really good them mate. Top work.

I take it any boost spikes there were have now gone?
cheers and it still spikes but nowhere near what it use to

[Turbo_Steve]

Right: Ignore what I said above, it appears things have moved on rather a lot since I last blew up a Skyline :D

That said, unless they're coming very cheap, I'd still look for better turbos.

[Subaru ETA]

from what i understand, the first thing skyline owners do is scrap the turbos! as steve said, they dont like too much boost. you should see my nieghbours one after trying to run 1bar through it.. lets just say there was lots of oil ON the engine.

and according to my mate who use to be a slaes rep for garett he recokns that the flow rates are crap house

[scott.mohekey]

From what I understand, there was a run of stock Skyline turbos that had ceramic housings. These couldn't handle large boost/heat, so people upgraded for the same or bigger aftermarket turbo.

[taupodrifta]

you can get them hi flowed which changes from ceramic to steel. Or there is the R31 turbo which is stell shafted from factory. I am trying to find a good semi easy to install aftermarket turbo setup but am niot having much luck on making a decision on what to use

[bow dn]

will have to get photos of the rear one when i put it back over my parents pit to fix exhaust leak

Bro they look mean, what size are they?

[taupodrifta]

Bro they look mean, what size are they?

thay are 38mm they are both atmosphere venting but don't sound the best so gonna look at getting the rear manifold modified so i can plumb them into the exhaust.

[VR4WGN]

so you didnt fit them for the sound then? hmmmm weird i thort thats why most people want W/Gates lol

[Turbo_Steve]

well, the best reason to fit them is the amazing boost control.

[taupodrifta]

so you didnt fit them for the sound then? hmmmm weird i thort thats why most people want W/Gates lol

no didnt install them for sound at all i installed them for there purpose but most cars don't sound like they do on the vr4 so have decided to plumb them back into exhaust

[VR4WGN]

well, the best reason to fit them is the amazing boost control.
what is it that makes this possible and why cant the factory unit do this?

[taupodrifta]

what is it that makes this possible and why cant the factory unit do this?

the factory units are alot smaller and the excess exhaust hole is alot smaller than an external gate which is why an external allows more control of your boost.

[Turbo_Steve]

There's also the issue of gas-flow turbulence on an internal wastegate: you already have a large established flow, to which you're trying to add a sudden, additional flow. It reduces the efffectiveness of the wastegate.

Also, the externals have a better valve: it's a proper up/down piston which means more linear response than a "flapper".

Finally, there is the actuator itself, which is generally much bigger and with a larger chamber and spring on asn external. Again, yeilds better control.

[VR4WGN]

oooh i see thanx lol

[christophskii]

hey guys i'm running a similar set up on the VR i just got. I've got twin turbosmart external wastegates, walbro fuel pump, Greddy profec-B spec 2 boost controller, 2.5 inch exhaust and pod filter.
the problem i'm having is i dont know how much boost the car ran from factory or how much is safe to run on current set up?
anyone that could help with the greddy boost controller settings would be much apresciated

[bradc]

search around for boost and fuel cut and you'll find a number of threads.

[Ryan]

and ditch the pod filter...

[OnBoost!]

^Yeah i don't know why people keep putting pod filters on them,i've seen heaps.

[VR4WGN]

loving my new HKS Filter........

[VR4WGN]

if i could id manufacture a clear perspex box to show it of. nw theres an idea!!

[taupodrifta]

if i could id manufacture a clear perspex box to show it of. nw theres an idea!!

If you can do them I will put my hand up for 1

[Turbo_Steve]

I Like the idea, but not the idea of having to wash it out every week: you seen the state the "in" side of airboxes gets into!?

[VR4WGN]

I Like the idea, but not the idea of having to wash it out every week: you seen the state the "in" side of airboxes gets into!?

house trained works a treat lol,i htink a good clean engine bay will maintain this.. aswell as a new UNDERTRAY lol..:3d:

[Turbo_Steve]

Nah, Q, it's all the dirt that falls out of suspension in the air inside the box - stuff that bounces off the filter and lands in there.

[VR4WGN]

oh,just think it could look like a DYSON machine while running,now thats fascinating lol

[sightless]

^^^ and the washing machines with viewing windows that are a pain to clean but still look cool

[Turbo_Steve]

It'd need LEDS in there......and maybe a nice properller that goes around and around as the air rushes through.

[VR4WGN]

ultraviolett light and ultra glow dust lol

[kstarr_nz]

how easy was it installing the wastegates? what brand are they?

[taupodrifta]

how easy was it installing the wastegates? what brand are they?

Don't know what brand as the gates and manifolds came off a mates car. Took me an hour to do the front one and 2 1/2 to do rear one and that replacing both manifolds and turbos

[VR4WGN]

revival time!!!!

i want to know a lil something guys!!!

how far or whts max distance i can have the W/G from the Manifolds?
im thinking of having them situated in a better location but not if it affects the performance at all

[taupodrifta]

you need to have them reasonable close but then again you can have some distance. put it this way for example you could setup our engines with only one gate to run both turbos but that is the max you could have them away from the manifolds so what ever distance that would be

[Turbo_Steve]

There is no maximum distance.
The further they are from the manifold, the more your engine will have to work to fill up the (longer) manifold pipework, so you will see increases in spool times as the manifold pipe to the wastegate gets longer. However, subarus manage to have deadly long manifolds without stupid impacts on spool, so I don't think it's the end of the world, we're talking a few hundred RPM if it's really really long.

The other side effect of siting the wastegate further away is that it does "dampen" it's impact on the boost control. Again, we're talking a few milliseconds, maybe a couple of hundred at worst, but if you've got a nasty boost spike you're trying to reign in, having the wastegate too far from the turbo / exhaust ports won't help any.

[VR4WGN]

interesting