Technical Pulsar 6266 vs 6466 (Goal 600)

[wtvlee]

I’m having a hard time deciding between the 6266 and the 6466.

I’m aware that the 6466 gives me head room if i wanna go higher and at lower PSI then the 6266 where it needs more PSI to reach 600.

I wanna run 93 oct cuz its gonna be a hassle for me to get E85, but do I need a upgraded LPFP?

 

[rev210]

Both of these turbos will be capable of ending the stock engine pretty easy.
Better question is what do you want your car to do? What is the goal? ( by that I mean time , 1/4mile 60-130 etc)
Plenty of single turbo cars that run slow times but, have impressive bits of paper from the dyno shop.
Understand no 93 octane but, what about a meth kit?
Yes you will need more LPFP pump no question ,in fact if you are wanting to push 600+ then there is a very long list of parts that will be needed. Including things you will break , like diff's and axles to name a few.

 

[wtvlee]

Both of these turbos will be capable of ending the stock engine pretty easy.
Better question is what do you want your car to do? What is the goal? ( by that I mean time , 1/4mile 60-130 etc)
Plenty of single turbo cars that run slow times but, have impressive bits of paper from the dyno shop.
Understand no 93 octane but, what about a meth kit?
Yes you will need more LPFP pump no question ,in fact if you are wanting to push 600+ then there is a very long list of parts that will be needed. Including things you will break , like diff's and axles to name a few.

I picked the 6266, but I’ve never thought about meth injection.

 

[LiteWrk]

I picked the 6266, but I’ve never thought about meth injection.

How do you like the 6266. In between getting that or the 6466 for my top mount speedtech kit. Is the spool that much faster on the 6266?

 

[odesh]

How do you like the 6266. In between getting that or the 6466 for my top mount speedtech kit. Is the spool that much faster on the 6266?

There is a dyno graph of Precision turbos. 6266, 6466, 6766. It's driven on stock 3.0 2JZ. There isn't almost any difference in spool but the top end of the 6466 is matching for 6766. I know that these turbos are different from the Pulsar ones, but Pulsar copies Precision so it should be close and imo useful info.

I personally went with Pulsar 6466, since the spool should be the same and the price was same as well. I haven't installed it yet, so I can't give real data with Speedtech kit. Me myself, I'm trying to decide if I'm going to change the open 0.96 a/r turbine housing (that came with the turbo) with 0.84 a/r divided turbine housing to make the spool little better.

 

[Thunderstorm1250]

I have a similar dilemma. My front hybrid turbo just failed. I'm looking at the Docrace top mount kit and debating between the 6266 and 6466. My car is setup for full flex fuel e85 + methanol. But most of the time, 80% of the time, I drive with 93+methanol.

I have a built engine but it is still open deck. So I think that I'm probably pushing the limits past 800 whp. I'd like to keep it under this limit on e85 but also be 600 whp when on 93+methanol. I'd be open to any suggestion. Most of the rest of the car is FBO or built up such as axles, LSD, suspension, brakes, etc... I'm also going to take this downtime opportunity to do a 6hp28 swap. My transmission is my weakest link I think, it's only a matter of time.

Thoughts on a turbo selection and what max power an open deck engine can handle? Please provide advice. I'm leaning 6466. This is a road car and I won't be tracking it or pushing it to the limit all the time.

Regards,

Eric

 

[Thunderstorm1250]

@wtvlee

I'm at 596 whp right now on VTT GC 2.0's using 93+boostane+methanol (2 BM12 nozzles in CP) tuned by DocVu. Granted my turbo just failed... I recently updated my fueling. But when I dyno'd my car, on my old setup, I was using a walbro 450 274 lpfp and port injection with 550 mL/min injectors (evolution of speed intake and injectors). My lpfp was pretty much maxed out. I estimate that my methanol is contributing about 1/10 of the hp energy or 60 hp equivalent. I hope this helps.

To make 596 whp (Auto tranny) at redline I was at 25 psi boost and 9 deg timing.

Regards,

Eric

 

[LiteWrk]

There is a dyno graph of Precision turbos. 6266, 6466, 6766. It's driven on stock 3.0 2JZ. There isn't almost any difference in spool but the top end of the 6466 is matching for 6766. I know that these turbos are different from the Pulsar ones, but Pulsar copies Precision so it should be close and imo useful info.

I personally went with Pulsar 6466, since the spool should be the same and the price was same as well. I haven't installed it yet, so I can't give real data with Speedtech kit. Me myself, I'm trying to decide if I'm going to change the open 0.96 a/r turbine housing (that came with the turbo) with 0.84 a/r divided turbine housing to make the spool little better.

View attachment 91277

Did you go with speedtech bottom or top?. Is there that much of a benefit to get a divided turbine housing with a smaller a/r?

 

[odesh]

Did you go with speedtech bottom or top?. Is there that much of a benefit to get a divided turbine housing with a smaller a/r?

I went with bottom mounted option since in Europe inspections can be really annoying with top mounted turbo. Plus the bottom mounted turbo should spool little faster compared to top mounted one, at least for Speedtech, according to other people.

And what comes to benefits of divided and smaller turbine housing... I really don't know if it's worth the $400. According to testing on 2JZ and RB30 engines, the 0.81 is the best overall turbine housing for 3.0L engines. But, they only tested open turbine housings. The spool difference between open 0.81 and open 0.96 turbine housings were around 200rpm, so basically nothing. So in the best case, 0.84 divided would be maybe 500rpm faster on spool compared to 0.96 open one. 500rpm for $400... Maybe worth for some people, IDK if it's for me and it's hard to pick the winner.

You need to also remember that open 0.96 would be better for engine, specially if you run stock internals. 0.84 divided could be too down torqy for the engine.

 

[E90ST_WideBody]

Please Don't Drag me as I'm new to the BMW and the N54. But I have just purchased an E90. Over the last month, I've bought some parts. Speed Tech 6466 kit. dual 450 Walbo bucketless, Hobbs switch, motive flex fuel, Smart turbo, Tail, 750CC, 7in fmic, Dual 3.5, forward-facing intake mani. Also yes I did get all the recommended maintenance parts as well, and the crank guard.

1st question, am I missing anything?
2nd on 91 and E85 what could I expect with a dailed in tune?
3rd Is it worth getting the dct or would manual be better? Or will my auto be fine?

street/daily not really beating on it, just wanna pick on cars and guys that think they are fast lol

I might lose too IDk but I want it to be as reliable as possible at this stage of its life.

 

[Thunderstorm1250]

@E90ST_WideBody

Seems like you got everything. Controlling with Reflex + MHD? LSD + suspension + brake mods? With big power you need this stuff. On e85 you could hit north of 800 rwhp with a 6466. Although I'm not too familiar with Speed Tech.

I just got my DocRace ST kit installed with 6466 turbo on my 2010 135i. I hit the dyno and I'm very happy with the results. 697.3 rwhp on 93 octane + boostane + 1500 mL/min 100% meth in CP. Tuned by DocVu. Near redline I'm at about 28-29 psi at 7 deg timing. I'm very happy to be at 700 rwhp without even beginning e85 flex fuel tuning. That comes next. DocVu is slowly walking up the power on e85. I'm probably in the mid 700's right now but I'll dyno it when I'm complete. I expect to be north of 800 on e85 + meth. My biggest issue is losing traction on logs! My 265 rear wheel Michelin PS4's may need an upgrade (I have LSD and other suspension upgrades).

I have similar upgrades as you. I'm using 1000 cc/min eos PI's and my primary LPFP is a 295 while the secondary is 285 (both bucketed). I'm using an external pressure regulator and return to tank from PFS. I did upgrade my 6hp21 to a 6hp28 via the GuruAutowerks adapter plate and Rod Sutphins tune. $2000 something dollars for the plate and kit + $800 for used tranny + couple hundred for tune... It's nice not to have to worry about the transmission. At a minimum, make sure you use the XHP Stage 3 flash, change fluids, and baby her. I have doubts that the tranny can take much over 600 whp. Prior to these recent changes, I was at 600 rwhp on twins and my tranny did OK.

I hope this helps.

Regards,

Eric

 

[E90ST_WideBody]

@wtvlee

I'm at 596 whp right now on VTT GC 2.0's using 93+boostane+methanol (2 BM12 nozzles in CP) tuned by DocVu. Granted my turbo just failed... I recently updated my fueling. But when I dyno'd my car, on my old setup, I was using a walbro 450 274 lpfp and port injection with 550 mL/min injectors (evolution of speed intake and injectors). My lpfp was pretty much maxed out. I estimate that my methanol is contributing about 1/10 of the hp energy or 60 hp equivalent. I hope this helps.

To make 596 whp (Auto tranny) at redline I was at 25 psi boost and 9 deg timing.

Regards,

Eric

I do have the mhd yes. And the stage 2 XHP for the trans. Dropped the car off the other day. excited. Been looked at the dct. What is the 6hp trans you talk about. Is that not what is already in these cars?

JSR is informing me that ill need a S4 xHP tune as well. I have no idea what one to buy....

 

[Thunderstorm1250]

@E90ST_WideBody

I think you have 6 tranny options:

- Do nothing and keep swapping and rebuilding. Have your tuner cut torque especially during shifts.
- Build up what you have, prob not a great option.
- Convert your 6hp21 to a 6hp28 swap, this is what I did, Check out this link: https://www.guruautowerks.com/
- DCT swap
- 8hp swap
- Convert to Manual

There are pro's and cons to each option.

 

[E90ST_WideBody]

Thank you I'll definitely look into this