[2Times]

What would be the next upgrades after installing the turbos? e85 tune?

[Sered]

Originally Posted by alr335xi

So I have been asked a couple of questions:

1st: Why TT and not the new single turbo setup.

Yes the single makes more power but you lose bottom end torque. Power isn't until 4000 RPM on the new singles. I like the smoothness and linear power of the TT.

Not even remotely true. Just outright false. Nothing about a single vs parallel twin setups that mean the twin will flow more in the lower-rpm band. If anything, twins are only used for packaging reasons as they flow LESS air than a single in the real world.

Unless you're discussing sequential twins of course, but we don't have those and it's possible to setup twin-scroll singles to function similarly.

I had no idea that ASR used GT CHRAs, those are a lot better than the old Mitsu design as you say. There's a reliability argument to be had there as Precision turbos have had a large amount of quality control issues over the past 5 years. Garret seems to be rock solid as always.

[alr335xi]

Originally Posted by Sered

Not even remotely true. Just outright false. Nothing about a single vs parallel twin setups that mean the twin will flow more in the lower-rpm band. If anything, twins are only used for packaging reasons as they flow LESS air than a single in the real world.

Unless you're discussing sequential twins of course, but we don't have those and it's possible to setup twin-scroll singles to function similarly.

I had no idea that ASR used GT CHRAs, those are a lot better than the old Mitsu design as you say. There's a reliability argument to be had there as Precision turbos have had a large amount of quality control issues over the past 5 years. Garret seems to be rock solid as always.

Sered,

I think you may have misunderstood what I said in regards to why I chose twin over the single setup. I never stated that all twin turbos outflow single turbo setups at low rpm. What I was comparing was the powerband of single turbo setups that are out there right now for the N54 in comparison to the ASR upgrades I'm installing. If you compare posted dyno results of Shiv's 335 with ASR Turbos vs. Shiv's Single Turbo dyno at the same boost level, the ASR turbos make 300whp and 450wtq @ 3500rpm vs. Vishnu's single which makes 200whp and 300wtq @ 3500rpm. Of course the Vishnu Single makes a lot more power at the upper rpm's and carries the torque curve longer. ASR explained to me that a small enough single turbo setup could result in similar hp and turbo response as my combined upgraded twins, but they also said that would defeat the purpose of going single. What I understood from them was that single turbo is a great way to go for guys that want to great top end power with reduced back pressure while increasing upper rpm efficiency. For those that are looking for that kind of powerband the Vishnu kit is a great option. The are pros and cons to both twin and single depending on how you look at it and what option works best for you. Its just a matter of preference for me since I like to have the power and torque come on sooner.

[alr335xi]

Originally Posted by 2Times

What would be the next upgrades after installing the turbos? e85 tune?

No, I don't think I will do E85. Most likely build the motor. Bottom end maybe? We will see. One thing at a time. Lets see how the drive train holds up?

[2Times]

Originally Posted by alr335xi

No, I don't think I will do E85. Most likely build the motor. Bottom end maybe? We will see. One thing at a time. Lets see how the drive train holds up?

I'm surprised that cam shafts don't seem to be a popular mod, our hp/tq drops off majorly and I'd think having a more aggressive cam could help make some power up top fairly easily. Can't say I see many threads on that though.

[RnmEvo9]

Originally Posted by 2Times

I'm surprised that cam shafts don't seem to be a popular mod, our hp/tq drops off majorly and I'd think having a more aggressive cam could help make some power up top fairly easily. Can't say I see many threads on that though.

Our stock turbos are the limiting factor on the top end powerband.

[alr335xi]

Originally Posted by 2Times

I'm surprised that cam shafts don't seem to be a popular mod, our hp/tq drops off majorly and I'd think having a more aggressive cam could help make some power up top fairly easily. Can't say I see many threads on that though.

VAC in Philly has cams, in fact they have complete internals. Look them up and call if you want details. Ask for Jamie.

[wtfmateim65]

Glad to see build with all the steps and research being done...can't wait to see results especially after the internals!

[klipseracer]

Originally Posted by alr335xi

VAC in Philly has cams, in fact they have complete internals. Look them up and call if you want details. Ask for Jamie.

My understanding about cams for our cars is to just increase lift and no duration changes. I'd like to see what these would do, but more importantly I'd like to know if the cost makes any sense.

[VMRWheels]

Originally Posted by jpsimon

good to see more modded XI's on here!

Agreed! Especially those who are pushing for 500+whp.

[Sered]

Originally Posted by alr335xi

Sered,

I think you may have misunderstood what I said in regards to why I chose twin over the single setup. I never stated that all twin turbos outflow single turbo setups at low rpm. What I was comparing was the powerband of single turbo setups that are out there right now for the N54 in comparison to the ASR upgrades I'm installing. If you compare posted dyno results of Shiv's 335 with ASR Turbos vs. Shiv's Single Turbo dyno at the same boost level, the ASR turbos make 300whp and 450wtq @ 3500rpm vs. Vishnu's single which makes 200whp and 300wtq @ 3500rpm. Of course the Vishnu Single makes a lot more power at the upper rpm's and carries the torque curve longer. ASR explained to me that a small enough single turbo setup could result in similar hp and turbo response as my combined upgraded twins, but they also said that would defeat the purpose of going single. What I understood from them was that single turbo is a great way to go for guys that want to great top end power with reduced back pressure while increasing upper rpm efficiency. For those that are looking for that kind of powerband the Vishnu kit is a great option. The are pros and cons to both twin and single depending on how you look at it and what option works best for you. Its just a matter of preference for me since I like to have the power and torque come on sooner.

I understand. Also, be aware, that there's no reason you can't run a smaller turbo using Shiv's setup either if you really want that much power in the low-rpm area. There is no benefit going with a twin EVER unless it is due to packaging reasons or running a sequential setup (or that you need so much air that there is no turbo model for your power needs).

I understand where you're coming from though, and you're right, with the current offerings out there; Shiv's single kit isn't setup for you. But there's no reason you can't strap on a smaller turbo than the 58mm?.

[alr335xi]

Originally Posted by wtfmateim65

Glad to see build with all the steps and research being done...can't wait to see results especially after the internals!

I am not doing internals at this time. We are off topic. At this point this is about my new twin install.

[alr335xi]

Here are some pictures before they go in tomorrow. You can see the custom billet actuators that ASR gets from Forge in England. They are beautiful, too bad you won't see them from above!! Also notice that they supply all the necessary what and oil lines with there kit.

I will be updating tomorrow night on how the install is going. We are anticipating not finishing tomorrow and having to work on Sunday. The Procede is already set up for upgraded turbos so I should be able to go run and do some logs right away. Of course I will want to take it easy for a little while and check for leaks.

[alr335xi]

[QUOTE=alr335xi]

Originally Posted by drfrink24

Looking forward to the dynos, hopefully the area under the curve, and/or peak HP will be worth the 100% premium over RBs

I am confident that they will be worth the money and install!

[alr335xi]

Disassembly started at 7:30 am est, stay to tuned.....

[M///1rider]

Originally Posted by alr335xi

Disassembly started at 7:30 am est, stay to tuned.....

Cant wait for updates, good luck!

[kdiggz]

omg hurry up, what's taking so long?! buy those guys some coffee or something and lets get some dyno results!!!

[alr335xi]

Originally Posted by kdiggz

omg hurry up, what's taking so long?! buy those guys some coffee or something and lets get some dyno results!!!

Funny!! It is just me and one guy! I would amagine it will be late tomorrow unitl we are done. BMW claims this as a 20 hour job!!

[pits200]

Originally Posted by alr335xi

Funny!! It is just me and one guy! I would amagine it will be late tomorrow unitl we are done. BMW claims this as a 20 hour job!!

BMW also claimed that adjusting my wastegates was a 12 hour job, lol!

I'm a Pittsburgh guy also and with you being so close to PRP since you live in Murraysville have you made a trip to the drag strip yet to see your times?

[alr335xi]

Originally Posted by pits200

BMW also claimed that adjusting my wastegates was a 12 hour job, lol!

I'm a Pittsburgh guy also and with you being so close to PRP since you live in Murraysville have you made a trip to the drag strip yet to see your times?

No, I track the car at Beaver Run or now PIRC. It is set up for road racing. I will take it to PRP once we are done with the new turbos.

[jbertino]

Update

[alr335xi]

Originally Posted by jbertino

Update

Going ok. Being that this car is an xi, there is a lot of crap in the way. Subframe is off and motor lift slightly. We broke a piece on the factory water line that we need. I won't be able to get a new one until monday so we will be delayed a few days. No big deal. The new turbos are almost in. Great fit, no problems so far with anything from ASR. The broken water line is our fault. Seems like it might of been a bad casting from BMW.



to be continued.....