GTX2867 .86 A/R vs .64 A/R Turbine Dyno

[Sales@RAI]

Solid lines are .64 A/R turbine @ 30psi

Dotted lines are .86 A/R turbine @34psi

[CorneliusRox]

wow, not much of a difference is there? I thought it would move the curve to the left more than that.

Very smooth and impressive though!

[EErie B6]

So you basically gain nothing but lag?

[ericpaulyoung]

I think that is awesome. There is no lag there. Look at the torque for the .64 and how flat it is. Lot less peaking. Plus that is at 30 psi vs 34 psi on the .84.

That is an amazing curve. I think People are not understanding what a blast that power band would be!!!!! I will be very happy if I ever achieve that.
Eric

[ericpaulyoung]

Ah, John you were saying the 84 buys you nothing but lag. Got it. I thought you were saying the switch to the 64 bought nothing but lag.
Eric

[CorneliusRox]

Ah, John you were saying the 84 buys you nothing but lag. Got it. I thought you were saying the switch to the 64 bought nothing but lag.
Eric

.82* ;-)

[EErie B6]

Ah, John you were saying the 84 buys you nothing but lag. Got it. I thought you were saying the switch to the 64 bought nothing but lag.
Eric

Yep. usually you switch to an .86 with the understanding that you will give up some down low to gain even more up top, in this instance it does not look like you gain much.

The compressor map of the GTX2867 is stellar. It's basically the spool up RPM (boost threshold) of a 28RS with the long legs of a 3071R... It looks fantastic for an "all around" setup.

[Dan[FN]6262]

that's why we're really suggesting this turbo for anything around 400awhp lol

[Dan[FN]6262]

also, you can run it on low boost and stay around 300awhp to keep a stock engine together

[jonnybravo]

What other mods?

[DRAKLORE]

Check out Arjun's build thread in the builds section
Drumnjuny

[jsandor91]

Would there be more of a difference with something bigger like a gtx3071r?

[Dan[FN]6262]

The absolute only reason you would go with a GTX3071 is if you are gunning for 450+awhp

[jonnybravo]

How much boost will be safe with a gtx2867 .64 with a stock block?

[DRAKLORE]

26 PSI

[Sales@RAI]

around 18psi. That should put you in the 280-300awhp area

hardware and tuning dependent.

[Sales@RAI]

26 PSI

nah, when we dyno'd Arjun at 26psi his car was making 356awhp

[DRAKLORE]

pshh you guys are no fun. stock block has been shown to be good for 350 whp-380whp

[Sales@RAI]

lol

[Don Supreme]

Post the new dyno Dan.

[jsandor91]

The absolute only reason you would go with a GTX3071 is if you are gunning for 450+awhp

im aiming for low 400's and that seems to be pushing the limit on the 2867r. so i figured gtx3071 with .64 would be awesome

[mec]

New dyno of a grx3071 with .64

[jsandor91]

New dyno of a grx3071 with .64

x2

[TofuShop]

is the motor built or stock?

[CorneliusRox]

is the motor built or stock?

completely built

[mec]

410hp on a gtx28 and stock motor? Really? Is that a question. Two times te power that this engine is rated for on a turbo that hits full boost before the stock k03. Think about it...

[TofuShop]

wasn't sure considering there are A3/GTis running the APR gt28 stage 3 on stock internals with similar numbers

[mec]

What no way. Are you looking at APR's website? If so, they are most likely talking crank, not wheel hp. Also the boost on a gt vs gtx does not come on as fast or as strong so it is not necessary to have internals. Same deal as a gt30, basically boost comes on later when the motor can handle it better, so as long as boost isn't maxed out the engine can handle it.

[ericpaulyoung]

I say putting rods in these motors should be considered a requirement, just like replacing the DV. Any large increase in power and you are a time bomb. If you don't push it hard it may last a few years, if you crank on it daily, you can get even small frame turbos like a GT28RS to break a rod in a matter of a few months.
Eric

[seal66]

I would agree. Rods should be a requirement

[q_dubz]

a rougly 50wtq difference at 4500rpm...i can dig it :) and a flatter longer torque curve as well. Makes for a much more responsive car...

[TofuShop]

What no way. Are you looking at APR's website? If so, they are most likely talking crank, not wheel hp. Also the boost on a gt vs gtx does not come on as fast or as strong so it is not necessary to have internals. Same deal as a gt30, basically boost comes on later when the motor can handle it better, so as long as boost isn't maxed out the engine can handle it.

I say putting rods in these motors should be considered a requirement, just like replacing the DV. Any large increase in power and you are a time bomb. If you don't push it hard it may last a few years, if you crank on it daily, you can get even small frame turbos like a GT28RS to break a rod in a matter of a few months.
Eric

Agreed w/ both your posts. No one in the B8 community has built their motor yet so i'm trying to see what's going on in the B7 community. RAI is releasing a GTX kit for us as well and it looks like only Integrated Engineering has internals for B8s so far.

Aside from rods and pistons, are there any other suggested upgrades while i'm in there?

[DRAKLORE]

Exhaust, a less restrictive intake (preferably a hole in your headlight ) lol ummm some sort of PCV work around, Boost Manager Plus, boost gauge.. I'm sure there's a few other crucial things to make a build successful

[ericpaulyoung]

You guys already have fixed HPFP cam follower, and they are too new to know about the oil pump/BS stability, or the cam adjuster thingy (I forget what the real name is). All stock engines have there weak spots, you just have to find them. Usually this means blowing up your motor :)

Since the designs are so similar, I would bet that the items not changed (i.e., rods) is still an issue. The cam follower being a roller, and the use of the newest cam adjustment would make me not worry about those. Also, if you go GTX you will have already replaced the OEM DV which takes a shit some time around 22 psi. If you go for a K04 upgrade, I would replace the DV with a Forge or synapse unit.

I see that you have the K04 already installed, how do you like it so far? Did you happen to get a dyno? I can pretty much assure you that you can squeeze an extra 30-50 ponies out if you get meastro and swap out your DV for something that holds more that 22-23 psi of boost. Some people for some reason hate any turbo that is GT28 sized frame, but you can easily push 270 g/s out of a S3 K04 (I have already done it) and this is on par with a lot of GT30 guys, so don't listen to those crazy dudes! ;)

- Eric

[ericpaulyoung]

You don't really have to do pistons though. The stock ones are fine. I don't know if the B8 has any consumption issues, so you may not even need to fix that.

Shane - I got a cool idea for the cold air thing. Kinda like the headlight you did, but you don't touch the headlights. Instead you custom fab an air scoop that sits in front of the radiator to extend the stock unit to grab more air. Should be totally stealth and get a better chunk of air too.
- Eric

[mec]

You don't really have to do pistons though. The stock ones are fine. I don't know if the B8 has any consumption issues, so you may not even need to fix that.

Shane - I got a cool idea for the cold air thing. Kinda like the headlight you did, but you don't touch the headlights. Instead you custom fab an air scoop that sits in front of the radiator to extend the stock unit to grab more air. Should be totally stealth and get a better chunk of air too.
- Eric

Just make sure it isn't too low or your filter will suck up water into the intake on rainy days/ winter.

[ericpaulyoung]

It will be at the top of the grill, and partition off the air that would go to the radiator. Simply, I am thinking about a scoop that takes about 1/8th the area, and shoots it to the intake. From the outside, you shouldn't see anything.
- Eric

[TofuShop]

Thanks for the suggestions. I'm running the old APR k04 map and my Podi boost gauge says i'm peaking at 15psi. Arin gave me their beta v2.0 map and it should put me at around 23-25 psi at full boost. I haven't dyno'd the car, but i'm going to try to get a dyno to show the difference between map v1.0 and v2.0. others who have dyno'd have reported between 250 whp and 300 whp with the k04. i have pretty much all available bolt-ons so i'm guestimating i should be at around 280 whp.

For the B7, is your diverter valve ECU controlled and actuated? so far, the only full replacement available that is still ECU controlled is from Forge. i e-mailed Synapse and they told me they have something being R&D'd that will be ECU actuated as well. i'm waiting for that to come out.

[CorneliusRox]

Thanks for the suggestions. I'm running the old APR k04 map and my Podi boost gauge says i'm peaking at 15psi. Arin gave me their beta v2.0 map and it should put me at around 23-25 psi at full boost. I haven't dyno'd the car, but i'm going to try to get a dyno to show the difference between map v1.0 and v2.0. others who have dyno'd have reported between 250 whp and 300 whp with the k04. i have pretty much all available bolt-ons so i'm guestimating i should be at around 280 whp.

For the B7, is your diverter valve ECU controlled and actuated? so far, the only full replacement available that is still ECU controlled is from Forge. i e-mailed Synapse and they told me they have something being R&D'd that will be ECU actuated as well. i'm waiting for that to come out.

yup, ecu controlled, and the OEM works fine for K03/04, but I think shane and the BT guys are running the forge DV which is based on vacuum and spring resistance, and I think it has a plug to trick the ecu for the DV.

[DRAKLORE]

I am
Running a BOV forge 004,


No plug needed for the DV. I even removed te wiring for
It
To
Clean up the bay. You know me