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Garrett Gt3071r Info

Nabil

By Nabil,
in Engines & Forced Induction

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Nabil Rising Star

Nabil

Posted
Posted

CAn you elaborate on this GT3071R

What size ex. A/R should i use?

What is it rated at? I think 500hp

What its response like and full boost rpm?

Do i need a custom dump? How much?

How much is this turbo cost? Best price was $1750 on ebay

Is anyone running this turbo on a RB25? If yes please state mods and power made.

FOR F@#$%K SAKE! :O

Does anyone know the ANSWER to any of the above QUESTIONS???

Ahhhhhhhhhhhhh much better now.... :(:(:(

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The Mafia Grand Master

The Mafia

Posted
Posted

I have one with a .7 cover and a RB25 Turbo read ground out to fit.

Comes on full boost at 3200rpm in second.

I'd go for the .6 compressor cover - Your max efficiency will be on lower boost. With the .7 compressor cover, max efficiency is at about 22psi - which is too much for a standard internal RB25.

So yeah, .6 compressor cover, and about 16psi and you should see over 250rwkw easily. If you want a bit of lag and heaps of top end, go for the .86 rear.

just make sure they don't sell you one with a to4s compressor wheel.

tridentt150v Grand Master

tridentt150v

Posted
Posted

:D

Talk to Slide off this forum! i just bought one for my rb25 & its being put on as we speak! its got the 0.82ar plus im putting in poncams etc so it should be fairly responsive!

:laugh:

Al_R33 I thought you had a 3076 as well???

quincy777 Community Regular

quincy777

Posted
Posted

i had 3071 on my rb20 in both .86 and .64 housings.

.86 reached 260rwkw @ 21psi, boost could be controlled lower, laggy as crap eg no boost at all until low3 full boost @ low 5rpm

.64 reached 257ewkw @ could not get boost below 22psi. 500rpm better.

Lots of fiddling to fit - not worth it IMO

discopotato03 Grand Master

discopotato03

Posted
Posted

Be careful peoples , not all Garrett GT3071R's are created equal .

Firstly the GT3071R-WG . Dog turbo becauses it uses the cropped GT30 turbine in a .64 or .86 GT28 IW exhaust housing . Failed concept , doesn't work acceptably and should not be on the market .

Rule (1) with GT3071R turbos , if it has a T25/28 flange (which is wrong for Skylines) its looking for a victim .

Secondly the R E A L GT3071R W I L L have a T3 flanged exhaust housing , not any old T3 flanged housing but a real Garrett GT30 type exhaust housing . The R E A L GT3071R will have an unmolested 60mm GT30 84 trim turbine , approx 60 x 55 mm dimensions . This turbine and its native turbine housing family are the critical components that make this turbocharger WORK properly . Its a production derivative of the Garrett competition specific TR30R turbocharger .

Do a few searches on Garrett GT3071R and wipe anything ending in WG or -WG . You'll find it at ATP Turbo in the US amongst other places . You'll also find it at turbobygarrett.com but only in the turbo comparison sheet . Scroll down the table to the last of the three GT3071R's , I think they quote is as the highest power capable variant at around either 440 or 450 Hp . Even search this site , at least one person here is using one on an RB20 .

Lastly , don't forget that genuine Garrett GT30 integral wastegate housings (T3 flange) are now available in .63 .82 and 1.06 AR ratio .

It it were me I'd read the turbos ID tag carefully if searching for one of these , it should say CHRA no 700177-0023 like that Garrett comparison sheet tells you . Don't accept any moron telling you that those numbers are unimportant or minor variations are insignificant .

Cheers A .

Nabil Rising Star

Nabil

Posted
  • Author
Posted

Thanks 'discopotato03' ill quote this CHRA no700177-0023 when i purchase the turbo.

While we are on the topic if a particular turbo is rated at 500hp. Is that the figure it can provide at the flywheel or the rear wheels?

Will this turbo clear the block and chasis? Will it need a spacer?

discopotato03 Grand Master

discopotato03

Posted
Posted

Hi Nabil , it seems the power figure of the turbocharger is worked out from its maximum compressor flow in pounds of air per minute . A conservative rule of thumb is 10lbs per hundred Hp so 50lbs of air to 500Hp .

No turbocharger manufacturer can work out how much Hp their turbo will make on any engine because there are so many variables . Its up to the person developing an engine to make it swallow as much air as possible and vent exhaust gas at a sufficient rate to not suffer reversion and pumping losses .So basically a 500Hp capable turbo may not get you 500 from your engine , it will depend on how well its developed .

Cheers A .

grim32 Community Regular

grim32

Posted
Posted
grim32,

Have you had yours tuned since mr squiggle had his way with it?

Nah i havent, i did notice on the last power run it was starting to roll out a cloud of smoke but didnt think to much of it at the time. A week or so later i saw it was blowing a heap of oil out the dipstick so i let it sit in the garage for a while. Recently i did a comp test and found no.2-6 were at 125psi but no.1 was only at 75psi. Lifted the head and no.1 bore was glazed up and there were detonation marks on the top side of the piston (melted). (Whoops accidently mis set the boost on the dyno and ran 30psi for a sec or two)

I decided to ditch the 20 for now and picked up a cheap R32 RB25de which i should have back in soon, i plan to run it at 15psi and see how it goes, if bad RB30DET here i come.

Cubes Grand Master

Cubes

Posted
Posted

Bugger. :D

The 25 will work well with the turbo you have but the 30 may choke a little.

15psi through the 25 head will be roughly the same air flow as ~19-20psi through the 20. Throw your stock turbo RB20 cams into it, better suited for turbo. :)

Cubes Grand Master

Cubes

Posted
Posted

The RB25 n/a springs actually are the RB20det springs.

Most experience valve float at higher boost levels as the rb25de valves are larger, so they really need a better spring.

But a lot have had good results when shimming their springs so that may be a cheap way out if your only looking to run lowish boost, which 15-17psi is. :D

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