Which of these turbos

[Dan8]

Am buying a turbo for my GE turbo conversion and which is most suitable for mine and compatable they are both fairly cheap and i know you get what you pay for but both have warranties or do i go for a Garret type i do not have a fortune to spend

 

Turbo :

T-4 Flange

A/R 0.66 Compressor

Inlet : 4.25"

Outlet : 3.38"

Inducer :81mm

Exducer :108mm

A/R 1.05 Exducer

Inlet : 2.76" x3.25"

Outlet : 4.25" V-Band

Turbine: 87mm wheel

Capable of 1000 + HP

Water and oil cooled

 

 

T04B Wet Floating Bearings Turbocharger with 3" Filter and 2.5 " VBand Exhasut Clamp Kit!!

Oil Cooled

Comes with 3" Filter

CNC Machined Flanges 4Bolt Designed fit most After market Mainfold.

25 to 35 Psi Peak Power Performance Output Capability.(factory warranty).

Comes with 2.5 " Vband Clamp.

Designed Usable for External Wastegate Applactions only

Compressor Specs:

3" Compressor Inlet

2.128" or 54.06mm Inducer

2.752" or 69.91mm Major

2" Compressor Outlet

Compressor .50 A.R.

Compressor 50 Trim

8 Blade Propeller Type

T4 Compressor Housing

Turbine Specs:

T4 Type Turbine

T4 4 Bolt Flange

2.539" or 64.50mm Exducer

Turbine 1.15 A.R.

Turbine 70 Trim

2.880" or 73.16mm Major

T4 Twin Entry Turbine Housing

[markssupra]

If you want it capable of 1000 + HP you might need a small fortune, are you planning on uprating your internals for that power level?

[RobSheffield]

If you do not have a fortune to spend then stick with the NA

[Dan8]

I do not want that power the advert is just copied and pasted and they state its capable of that

i only want mint to be 300bhp

[Gaz6002]

What is wrong with a PHR or Boostlogic kit?

[Thorin]

If it's a turbo capable of 1000BHP but you're only wanting to have 300BHP then it's pointless and would be crap to drive. Just stick with the NA or do a TT transplant.

[Scooter]

If it's a turbo capable of 1000BHP but you're only wanting to have 300BHP then it's pointless and would be crap to drive. Just stick with the NA or do a TT transplant.

 

 

not necessarily......................if you are going for a NA-T and only want 300bhp then you can stick with stock compression.

 

You'll then only lose response / power from the turbo manifold being restrictive (not sure if the intake path via a intercooler effects throttle response?). As you'll only be running 4-5psi, having a small or large turbo to some extent makes little difference, both will make the boost easily just some earlier than others.........a larger/later spooling turbo may even be preferable on a stock compression NA-T?

[JustGav]

They read very much like XS power units...

[Homer]

They read very much like XS power units...

 

Yep, the 2nd one is one of the truly awful XS power ones... Massive exhaust housing, tiny compressor. 450bhp max on a good day, but totally unsuited to a 2JZ.

 

The top one looks like the GT45 spec one. another useless turbo (there was a thread a few days ago where the nut on the end of the shaft fell off!!)

 

Edit - added pics of the xs compared to a proper turbo

[Chris Wilson]

Only buy turbos you KNOW can be serviced, repaired and have alternative housings supplied IN THIS COUNTRY and that you KNOW are designed for petrol engines. This probably condemns 90% of the ones on Ebay. The Skyline forum are having a group buy on ALL genuine Garrett turbos at the moment, some of the prices are really good.

[Scooter]

for this guy and others in the future, what turbo do you think he should be looking at to run such low psi on a NA-T?

 

Given that nearly any turbo will give the required boost what is there to consider spec wise?

 

Could you get a setup to give nil psi to say 4000rpm and then it quickly goes to 5psi by 4750-5000rpm? similar to a laggy'ish proper single?

 

eg the one Homer describes as truely aweful is presumably because 1) its poor quality but 2) its laggy and ultimately not powerful? but wouldn't this characteristic (the laggy and low power not the poor quality) be preferable or should i say adequate for a low boost NA-T?

[Thorin]

The best option IMO is a pair of CT20 Turbo's... fitted to the 2JZ-GTE engine.

[pezzler]

if your looking at 300bhp; sell up and get a tt...cheaper in the long run....and possibly the short run too come to think of it. a stock tt would be a better base car to work from than the n/a, you'll only find yourself wanting to wring more power out eventually.

[Scooter]

The best option IMO is a pair of CT20 Turbo's... fitted to the 2JZ-GTE engine.

 

 

if your looking at 300bhp; sell up and get a tt...cheaper in the long run....and possibly the short run too come to think of it.

 

whilst i appreciate that this is almost always the best, cheapest easiest etc way of getting 300bhp i'd still like to know from anyone would cares to add a technical opinion of which turbo they would use to run a low boost NA-T.

[Homer]

I'm still trying to figure out the how compressor maps work so my knowledge is rather limited... however based on feedback from people that have done the NA-T conversions the best suited turbo for a low boost application would be something like the Precision/garrett T61 with a small low A/R exhaust hosuing. At lower boost the turbo will be closer to it's best effciency range (though still not ideal), will offer a quick spool that isn;t going to run out of power at higher rpm. I think the key with the NA-T on low boost is to get a turbo which can spool quickly and be close to it's peak effciency at low boost for as much as the rev range as possible.

[Scooter]

I'm still trying to figure out the how compressor maps work so my knowledge is rather limited....

 

ditto...........its interesting stuff but not straight forward with all the factors involved. It seems easy to find a turbo for medium boost high power applications from the Turbotechnics maps/info, but few seem near the effeciency islands at the GE's flow rate with low boost.

 

i spose the T-61 would offer plenty of headroom and is a known quantity

[Andy Blyth]

Homer,

 

For compressor flow maps, I found this site to be a really helpful tutorial.

[Homer]

Homer,

 

For compressor flow maps, I found this site to be a really helpful tutorial.

 

Thanks Andy, thats one of the pages I've read in the past few months, as well as some very informative threads from TLicense. The basics are pretty clear but have not got everything in my head yet to fully understand this black art. It's all very interesting so hope to spend more time reading once work allows... It's very good reference for others here

[Andy Blyth]

I feel your pain Homer! I've been trying for the last month or so to get my head around fluid dynamics, just so I can understand this from first principles.

 

My biggest problem so far is that as an Electronics Engineer, I try to find analogies with batteries, resistors and pieces of wire. It just doesn't work the same with compressible fluids!

 

I thought my plan might have worked too, as I was taught first principles of EE with tanks of water, taps and pipes!