[Quick335XI]

After a long road, I'm finally toward the end of getting my new built motor all sorted out, tuned, fueled etc... it looks like the Pure stage 2 "high flows" are now the limiting factor. After the built motor, I figured they would run to 30-32psi and I'd be done, but what we're seeing (E85) is they seem to max out around 27 to 28psi before we start having issues with things like too many timing corrections, misfires etc. So then I googled and it does seem like even for the high flows, around 27ish is they're safe max. I also have stage 4 race heads, so the boost# is probably lower than it would be if I had stock heads.

My question is, I saw a dyno post on this forum recently where someone had the 6466 turbo and it was running 33psi (like around 800hp!). Is that car's ability to run that much boost simply due to the turbo difference of the 6466 and my PS2's? The most boost typically from a stock turbo is around 19psi; i wonder what it is for E85?

My twins are leaking just a bit of oil, so I'm pondering whether to get them repaired, or move to the 6466 (suggestions on a kit?). I've heard single turbos setups take more ongoing "tinkering" and tuning than twins do - any thoughts on that?

The thought of a 6466 setup makes my mouth water lol... but I don't want to have that "never satisfied" bug but I'll admit, I'm a little bummed at the 27ish wall after putting this stout motor in the car Was hoping for around 30psi and 700hp.

[Ozzie335i]

Will the XI handle that kind of power?

[mweisdorfer]

Originally Posted by Quick335XI

After a long road, I'm finally toward the end of getting my new built motor all sorted out, tuned, fueled etc... it looks like the Pure stage 2 "high flows" are now the limiting factor. After the built motor, I figured they would run to 30-32psi and I'd be done, but what we're seeing (E85) is they seem to max out around 27 to 28psi before we start having issues with things like too many timing corrections, misfires etc. So then I googled and it does seem like even for the high flows, around 27ish is they're safe max. I also have stage 4 race heads, so the boost# is probably lower than it would be if I had stock heads.

My question is, I saw a dyno post on this forum recently where someone had the 6466 turbo and it was running 33psi (like around 800hp!). Is that car's ability to run that much boost simply due to the turbo difference of the 6466 and my PS2's? The most boost typically from a stock turbo is around 19psi; i wonder what it is for E85?

My twins are leaking just a bit of oil, so I'm pondering whether to get them repaired, or move to the 6466 (suggestions on a kit?). I've heard single turbos setups take more ongoing "tinkering" and tuning than twins do - any thoughts on that?

The thought of a 6466 setup makes my mouth water lol... but I don't want to have that "never satisfied" bug but I'll admit, I'm a little bummed at the 27ish wall after putting this stout motor in the car Was hoping for around 30psi and 700hp.

I would encourage you to talk to Rob Beck about your concerns and twin Turbo needs. He's extremely knowledgeable and a good guy to talk too. He has more experience in making/selling turbos on the N54 then probably anyone on this platform.

He sells a set of TD04's for about $3299.00 called / RB Game Finishers/High Flow

If you pay him by money order or wire transfer, you will get a discount on the price above.

They are rated at 650-700 HP

- Billet 19T Compressor Wheel & RB Bullet Nut
- Larger than TD04 Thrust Assembly Upgrade
- High Flow Custom RB04XL-9 Blade High Aero Turbine Wheel
- RB Custom High Heat Turbine Shield
- RB Custom Cast TD04 Compressor Housings
- In-House VSR Balanced To .1G Levels (.2G Max)

[Quick335XI]

Originally Posted by mweisdorfer

I would encourage you to talk to Rob Beck about your concerns and twin Turbo needs. He's extremely knowledgeable and a good guy to talk too. He has more experience in making/selling turbos on the N54 then probably anyone on this platform.

He sells a set of TD04's for about $3299.00 called / RB Game Finishers/High Flow

If you pay him by money order or wire transfer, you will get a discount on the price above.

They are rated at 650-700 HP

- Billet 19T Compressor Wheel & RB Bullet Nut
- Larger than TD04 Thrust Assembly Upgrade
- High Flow Custom RB04XL-9 Blade High Aero Turbine Wheel
- RB Custom High Heat Turbine Shield
- RB Custom Cast TD04 Compressor Housings
- In-House VSR Balanced To .1G Levels (.2G Max)

Why? I’m making around that right now with my PS2 high flows.

No, when I replace these I’m pretty sure I’m going to a single, probably 6466.

[Quick335XI]

Originally Posted by Ozzie335i

Will the XI handle that kind of power?

Why not? I don’t plan to be doing many drag strip high rpm launches. So far XI has been great and a lot of them running around with high HP. The AWD is a real hoot with this much power... so much traction.

[feuer]

Originally Posted by Quick335XI

Why not? I don’t plan to be doing many drag strip high rpm launches. So far XI has been great and a lot of them running around with high HP. The AWD is a real hoot with this much power... so much traction.

RWD would be always faster :-) On the PSI limit, that would depend on the turbo as they move different amount of air at same PSI, so the HP output would vary as well. I have n54tt and n54st (small 5862) and the ST makes more power at identical PSI because moves more air.

[Quick335XI]

Originally Posted by feuer

RWD would be always faster :-) On the PSI limit, that would depend on the turbo as they move different amount of air at same PSI, so the HP output would vary as well. I have n54tt and n54st (small 5862) and the ST makes more power at identical PSI because moves more air.

Well I disagree and will not start another AWD debate sorry.

As for the turbos, I have a setup making around 650 Awhp now. I sure won’t be switching to a different set of twins that would be very similar...

Does anyone know the max boost E85 is good for? 93 with upgraded twins is around 93 but I saw a 6466 setup running 33psi on E85 on the MD log thread on this site...

[feuer]

Originally Posted by Quick335XI

Does anyone know the max boost E85 is good for? 93 with upgraded twins is around 93 but I saw a 6466 setup running 33psi on E85 on the MD log thread on this site...

Probably you made some typographical errors there ^^^

[Torgus]

With a built n54 motor and head a 6466 is the smallest I would go, assuming you can fuel it of course

All twins based on the factory twins run out of steam around 700whp regardless. Above 700whp is single turbo territory basically.

A 6266 will max out at 800whp basically on 100% E85 leaving you no room for more. So consider that in your single decision.

[Quick335XI]

Originally Posted by Torgus

With a built n54 motor and head a 6466 is the smallest I would go, assuming you can fuel it of course

All twins based on the factory twins run out of steam around 700whp regardless. Above 700whp is single turbo territory basically.

A 6266 will max out at 800whp basically on 100% E85 leaving you no room for more. So consider that in your single decision.

Those are pretty much my thoughts exactly.. The plan is a 6466. I won't be able to get one though probably til another year. Till then I'll have to "accept" 625-650 lol. Can't wait to get this beast dyno'd... still fine tuning though.