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Turbo Upgrades... What To Do

chef_stagea

By chef_stagea,
in South Australia

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chef_stagea Grand Master

chef_stagea

Posted
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im looking to do some turbo mods fairly soon....

its for the stag (neo 25)

so far ive looked at a kkr430 (heard mixed stuff bout them...

ive heard they will hit full boost at around 3k on a 25... (seems a little low to me?)

a garret 3076r... is this going to be too big for street... do i really need somthing this big... also not tooo cheap..

or a highflow of my stocker to save rooting round...

i wona run around the 15psi mark... nice and safe and not too much for street :P

feedback from ppl whould be great :)

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Aberax Grand Master

Aberax

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a garret 3076r... is this going to be too big for street... do i really need somthing this big... also not tooo cheap..

Depends on what rear housing you get, I have a 0.82 on mine and it takes awhile to spool, but when it hits boost, it can be a bit of a handful but as you have AWD, it should be alright. If you want something a bit more responsive, maybe look at a smaller rear housing for the 3076, or maybe get a 3071...but for good response and power, I suppose you cant beat a Hi-Flow.

StealthX Veteran

StealthX

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Go for a Garrett. Sooooo many options, amazing quality, lifetime warranty, well worth the extra coin. You wont be disappointed.

One thing I can suggest man, is that choosing a turbo based on a target boost level is the most backwards way I've ever heard of...

15psi from a 2860 is a sh!tload less air than 15psi from a 3582...

How much power do you want? Choose a turbo that's gonna place your power figure, smack in the middle of the meat of it's efficiency range, take note of what boost it should be putting out, check out the Garrett website for the catalog and compressor efficiency graphs for that. Then tailor a rear housing to suit your application (street car, drag car, circuit car weekend warrior, daily driver etc...)

good luck.

Matty 31 Grand Master

Matty 31

Posted
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and you can get them with the proprietary nissan housings (new, not remade like some of these custom ones) for around the 1600 mark

go see pete at autosport, he's stocking garrett stuff now. was looking at a 3071 before my plans changed

heslo Grand Master

heslo

Posted
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Horror stories I've heard. I haven't used one personally but I don't put China rubbish on my car. My motto is always do it once, do it properly. I've seen first hand results of the 3071R and they can't be argued with.

Aberax Grand Master

Aberax

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In my opinion the KKR gear isn't exactly shit, more tedious to get installed. I was at Horsepower In A Box one time, when Morrie was installing a KKR onto a car. The supplied banjo flange etc, was wrong, so had to have a custom one made/find a replacement. Build quality may be a tad questionable compared to Garrett, HKS turbos.

heslo Grand Master

heslo

Posted
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Personally, if I find build quality questionable, I find myself thinking "what else can go wrong"

With our cars, there are so many options out there it can get confusing. But also, you have the experience of plenty of others before you to help decide what to do. At the end of the day it's your money, spend it how you wish. If you can stretch the budget to a 3071 I'd do it in a heartbeat

StealthX Veteran

StealthX

Posted
Posted (edited)
HKS 2530 or Garret 2860. Nice 250rwkw with boost starting under 2,000rpm with full boost by 3,500rpm. What more could you ask for?

f**k yeah... I love the powerband from my 2860 on my 2.5l...

Solid 200awkw with 13psi. 4cyl though... Full boost by <1500 :P

Edited by turbo x-trail
Nightcrawler Grand Master

Nightcrawler

Posted
Posted

0.86 if you want more top end power but a bit of a lag monster, 0.64 if you want something streetable, which is what you will use 99% of the time. Depends too if you are going a top mount or low mount manifold, if you are buying a decent tuned length/stainless manifold, if you have upgraded cams/cam gears and how they are set .... there are lots of other variables too.

Krishy Grand Master

Krishy

Posted
Posted
Just talking to the hypergear guy, would I want a .86 or .64 rear housing? 300 differsnce to go .86

I am running on of the Hypergear turbos......been running it solid for over 18 months or more now.....it hasnt given me any grief and i am running the 0.63 rear housing......makes a nice 246 rwkw and for the boost that you want to be running it will handle it no probs....by reading your post you are after a good mid range performance and not really care about the top end power which is perfect for the daily streeter.....

hypergear Grand Master

hypergear

Posted
Posted

I think the OP got abit confused. The OEM housings is in .63 which is the OP6, the next one up is in .82. I'm confident that the OEM .63 housing can push out around 260rwkws, but if the power goal is higher then it is definitely better to go for the .82 rear. You find it makes power lot easier using less boost, with better torque and lot less heat.

The down side is .63 is more responsive, while .82 is laggier, So if its a every day car its probably worth going for the standard high flow, But if this car serves most of its life on tracks then the .82 is definitely better.

So three things should be put into consideration:

1. In future will I want more then 260rwkws.

2. What is my purpose of building this car.

3. Would I prefer the current driving ability with mid-low power range (ie Very aggressive with 1st, 2nd and low 3rd gear.) or some thing with hug mid-high power range (ie very aggressive on 4500RPM+ 2nd, 3rd and 4th).

I've got few dyno sheets on my thread, Please have a read which will be very helpful to your decision.

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