Flexer

I'm pretty excited about it as I think a 35R might be a little more lag than I am looking for on my 2.0L, but I'm getting complacent with the GT3076R I have right now.

http://www.enginebasics.com/Advanced...0GTX3576R.html

TheShodan

iTrader: (14)

Possibly. I think the GTX3076R would be a better match for the use. Considering that the 11 blade single bladed design needs more rotational speed than the standard, and its 3mm smaller in the inducer and over 6mm smaller in the exducer than the standard cast model, using the same turbine wheel, structure and shaft, it will be interesting to see. This is similar to what Forced Performance did about 5 years ago to their HTA GT35R.

Flexer

Back to back dyno's have shown that the 30R turbine wheel can't flow the cfm that the new billet 76mm wheel is flowing. The new GTX3071 seems to be a perfect match of flow, but the 76mm is just to much.

Why would you suggest the GTX3076R knowing that it is just TO MUCH FLOW for that poor little 30R turbine?

TheShodan

iTrader: (14)

Because I don't use the dyno to show its use for it. I guess I'm old. i only use the circuit track to run the GTX3076R, and don't rely much on dyno charts when it comes to smaller turbochargers unless there is a boost pressure/rpm graph to compare to (especially those less than 65lbs/min). I admit, the compressor wheel is a bit on the large side for the turbine (almost the same mistake they made with the GT3040R), but its still usable for circuit events, as it was never intended to be a Super Powermaker.

Getting the best of two worlds of response AND BIG POWER is almost impossible, as both Garrett and BW EFR have tried, EFR being slightly more successful in this particular race. But I think that the GTX3076R is about as good as Garrett has for this particular use. I only see the newer GTX3576R as being something to compete with the 2.5 litre sector with good flowing head(s) on certain platforms. Just like the FP HTA.

ZMX

How is it too much flow for the turbine? All it means is you have to run slightly more boost to force air past the turbine, just as if you had a more restrictive exhaust or smaller cams... The cylinder pressures will end up being the same, so what difference does it make? The only thing that will happen is you won't be able to run the absolute **** out of the turbo by running it way past the choke line. Oh, and way better spool.

The difference in boost threshold between the GTX3076 and GTX3071 is almost nothing. Also, the GTX3076 makes GT35 power.

http://forums.nasioc.com/forums/show....php?t=2110277

turbociv910

tested one, spooled later on a 3.5litre by 500rpm on 9 psi compared to an off the shelf 35r, both with 1.03 housing

ZMX

500RPM later on what 3.5? Also, what 500RPM? Was it 2000 to 2500? 4000 to 4500?

And, how was the engine cammed, tuned, etc?

Tony the Tiger

Sometimes choosing a proper compressor is not always about peak flow in relation to the turbine... Especially in some circuit racing applications, when air temps, heat, engine bay temps, and continuous operation will determine the choice of compressor.

For example, although a GTX3071R may seem to be an appropriate turbo when we speak of sizing the compressor vs overall power for most street driving and drag racing, but it depends on boost pressure and lbs/min to determine where the compressor will be running on the compressor map in its efficiency range.

Some engines (like most single cams) require sh*t loads of boost to make power, especially those with smaller cams and stock head... In this case, running a GTX3076R will result in more lag, but net you much better efficiency and landing on a much better spot on the map.

On a circuit condition, this also mean lower IAT's, lesser chance of heatsoaking the intercooler, or possibly get away with using a smaller intercooler to have other benefits like more airflow to the radiator, more room for oil coolers and such, less openings at the front bumper for better aero, or even gain a bit of transient response from a smaller intercooler.

Just thought I bring up these few things to look at turbo sizing in a different perspective beside dyno and street/drag racing

Muckman

iTrader: (2)

Now I need to see a GTX3576 vs a GTX3076 comparison.

Flexer

WOW. Your kiding me. Its hard to believe a GT3582R would spool faster than a turbo like the GTX3576R being that it has a smaller and lighter compressor wheel.

Its almost too hard to believe, but you tested it. Can you share the dyno plots please? Or the data logs if you never dyno'd it?

JR

Muckman

iTrader: (2)

Bump for turbociv910's claim. Please post dynos, logs or anything you have.

TheShodan

iTrader: (14)

It's too new for anyone to test yet.. Patient's Muckman. give it about 3 months for full release. It didn't come out until last week . And i'm sorry, but 9psi is not a test. That's not even remotely close to its boost pressure effective range of 15-33psi of pressure

vtecmasta85

Hey when does this new Turbo come out? I wanna do more research on it cuz I might do a Turbo motor later. Ir wonder what will the difference between the older and the newer 3076r will be. Will it spool faster? I want a Turbo setup for daily driving/street that spools fast but still makes power all the way up. Useable power Is what I'd Like so I could still do dig runs and keep using my itr trans. Thanks for your advice!

TheShodan

iTrader: (14)

What you're asking can be done with a large variety of turbochargers other than just from the GTX3576R. Even the cast wheels can do that if the right combination is chosen.

Schister66

Comparing an EFR and the GT35r is the only logical comparison as there isn't any direct Garrett competitor for the EFR other than the GT35r...am i missing something?

TheShodan

iTrader: (14)

Yes, there are about 5-7 EFR configuration turbos that have comparable Garretts to match. the 7670 and 5876s are just examples. You can find the full EFR lineup on Full-Race's website