BW S256 Question

[wt71gas]

Something else to consider - The S258 also uses the larger S300 style compressor housing with 2.75" outlet. The 256 housing will clear the waterpipe and has a 2" outlet. Bullseye will soon be shipping a 258 with the 256 style comp. housing though.

Also very true. That was not mentioned before

 

[Jon Lane]

By the way Jon I saw you got that turbo today, how do you like to looks of it? I think you will like how it performs a little better than the vtrim.

Looks fine to me, Wayne (but all I've ever had was a T25.) Your service was outstanding.

 

[damnslowtsi]

Sorry for another off topic but this looks like a good place to ask.. I 've seen on the BE site that S366 also comes in two turbine flavors. Are both available with the bolt on housing or any particular one? Thanks.

 

[4wd-Eclipse]

I am going to be using the BEP bolt on housing with the S362. There is only one option on wheels for that to in the bolt up.

Is there any T3 inlet 3" v-band outlet turbine housing for the S362 turbo?

 

[Steve93Talon]

Here are a couple pics of the .70 undivided T3 housing with 4 bolt outlet. Their divided T3 has a 6 bolt outlet. No V-band T3s that I know of, only T4.

 

[4wd-Eclipse]

I found this
http://www.bullseyepower.com/catalog.asp
See the S362 turbine housing with 0.6 A/R and 0.7 A/R are T3 inlet with v-band outlet ... is that true?
Whereas in http://www.bullseyepower.com/S300.asp
There is NO T3 inlet with v-band outlet housing option.

wt71gas could you please clear this?

 

[AWDer]

Wayne has certainly done his homework on these turbos. I went ahead and ordered the S256 Extended tip. It is only available in the 64/74 configuration, so easy choice. I plan to run it to the max pressure ratio efficient up here, which is around 34-35PSI, so hopefully I will be able to give out some numbers soon.

Josh

 

[Steve93Talon]

Wayne has certainly done his homework on these turbos. I went ahead and ordered the S256 Extended tip. It is only available in the 64/74 configuration, so easy choice. I plan to run it to the max pressure ratio efficient up here, which is around 34-35PSI, so hopefully I will be able to give out some numbers soon.

Josh

Very curious to see your results, as I was running the same turbo. I was dialed in pretty well at 32psi on VP103 when the car was wrecked, would've loved to see what the car could do.

 

[wt71gas]

Is there any T3 inlet 3" v-band outlet turbine housing for the S362 turbo?

Yes they show an option on my price sheet for a T3 inlet, and vband outlet. They should offer those in two different a/r choices. I would have to call and verify but that looks to be the case.

 

[wt71gas]

I found this
http://www.bullseyepower.com/catalog.asp
See the S362 turbine housing with 0.6 A/R and 0.7 A/R are T3 inlet with v-band outlet ... is that true?
Whereas in http://www.bullseyepower.com/S300.asp
There is NO T3 inlet with v-band outlet housing option.

wt71gas could you please clear this?

Here is some current news for you guys. The S362 is available in two different choices as shown above. The S256 will have a smaller turbine wheel in the future but it is mainly the 1.6l and 1.8l honda guys who have been begging for that. Bullseye said the dsm's move enough air for the bigger turbine wheel in that turbo.

 

[4wd-Eclipse]

wt71gas thanks for the clarification. If possible please PM me the price of the S362 in T3 inlet, v-band outlet and 0.7 A/R turbine housing. On other hand please let us know the result of your comparison between FP3065 and bolt-on Bullseye S362 turbo.

 

[damnslowtsi]

Sorry for another off topic but this looks like a good place to ask.. I 've seen on the BE site that S366 also comes in two turbine flavors. Are both available with the bolt on housing or any particular one? Thanks.

I could call I guess but since there was a confusion on one of the vendors site I 'd rather get it straight from somebody who knows. Thanks again.

 

[wt71gas]

I could call I guess but since there was a confusion on one of the vendors site I 'd rather get it straight from somebody who knows. Thanks again.

The S366 has two turbine wheels available for the t3/t4 housing turbos. If you want the bolt on housing it is a 66.7mm / 76.1mm turbine wheel.

 

[Steve93Talon]

Here's a teaser shot of an S258 with the .70AR T3 hotside and the ERL stainless manifold. It clears the waterpipe and slim fan perfectly. More pics to come...

 

[iwantawd]

A little off topic..... For you guys with experience with the s256, do you think this could be a decent turbo on a 240sx that autocrosses?

 

[T9S1i]

Would this turbo be a good choice for someone who is kind of "stuck" between a SCM50 and a GT30R? Ive been going back and forth between the two for a long time, trying to figure out which one is best for my goals. I know the 50trim is tried and true, great street pump gas turbo and is rebuildable, the GT30r is newer technology, and can support more power, but if it blows up or something goes wrong, then im SOL.
The 256 seems kind of like the happy medium. It will probably spool more similar to the 50trim, but be able to make the power of the 30r, and from the wheel technology have nice transient response, and last but not least, its rebuildable correct?

If any of my assumptions are wrong, please chime in.

Steve93Talon, i was closely following the progress of your car with this setup, too bad what happened man!!! If you have any more info to add, please do. It was nice to have an experienced DSM'r who has been through a few turbo's to be able to compare this setup. Now it seems like nobody is running this turbo, or at least isnt talking about it.

 

[Steve93Talon]

You're pretty much in the same boat I was in. I had already been down the 50 trim path with the Green and wanted something with similar spool and a bit more kick, and didn't want to go the BB route. It definitely filled my needs. I had planned on switching to the .70 T3 hotside after I got some race gas passes to see how much could be gained. If you want to maximize it's potential you might want to consider that route. It doesn't really cost much more.

 

[T9S1i]

yeah, im most likely going bolt on. Ive already got the 2g manifold and ported it, i have an o2 housing setup for external wastegate and its kind of custom (i had an evo3 o2, and had the downpipe made for the correct angle, then when it came time to upgrade to external, i had the new o2 housing made the same angle as the evo o2, so my downpipe would bolt up) so i would feel like i was wasting even more money, switching manifold, o2 housing, and downpipe, rather than just buying a turbo. Im not trying to max it out to full potential, just hit 12's with my 16g, then upgrade my turbo to one that will run 11's on pump.

Thanks for the info steve, i keep leaning towards this turbo more and more. Where were you getting 20psi at? if i remember correctly you said mid 3000 rpms?

 

[Steve93Talon]

It should have no problems meeting your goals. I saw 30+psi under 4k, 25 psi by about 3600, so I'd guess 20psi by like 3400ish.

 

[T9S1i]

beautiful! what kind of tuning were you doing with dsmlink for the quick spoolup, if any?

 

[Steve93Talon]

Nothing really, might have pulled some timing and fuel during spool but you're pretty limited in what you can do with DSMlink there.

 

[wt71gas]

The S256 will spool a lot quicker than a 50 trim and will flow a considerable more amount of air above 15psi. The extended tip turbos also spool very very fast and will be right there hanging with any ball bearing turbo around as far as spool tome goes.

 

[wt71gas]

A little off topic..... For you guys with experience with the s256, do you think this could be a decent turbo on a 240sx that autocrosses?

This is a very good autocross turbo. The S200 series is the smallest and quickest spooling turbos of the extended tip. The power is great and the spoolup time is even better. The compressor maps for these turbos would make it seem like an extended tip turbo of some kind would be a very good autocross turbo.

 

[AWDer]

Alright, I got the turbo on the car. The external wastegate is mounted and there are no leaks.

My only problem I am having is really slow spool up. I am not hitting full boost in third gear until around 4800 RPM and first gear is practically useless, for some reason. I did a boost leak test to 30 PSI and found nothing. I replaced all gaskets (manifold to head, turbo-manifold, and O2 housing-turbo), I just cannot figure it out. Any tips will be useful. On a plus side even with this problem I was seeing 46 lbs/min of airflow at 25 PSI and once it does hit it does not ever drop off even at my 8000RPM shifts, that is at an altitude of 6000FT. Going from here to sea level, I usually see a 3-5 lb/min increase at the same boost level. Which, means this turbo should flow around 50 lbs/min easily and obviously more with more boost.

 

[AWDer]

Alright, I went out and did some spool up tuning. My intake temps are 100+ degrees, due to the 100 degree outside temps. I am now getting full boost at 4100 RPMs in this heat. Keep in mind I am at 6000ft. I usually decrease my spool up by 300-500 RPM by going to sea level. I think it is feasible to see in the mid 3000 rpm range for full boost at sea level and 70 degrees, maybe even at my altitude with much cooler temps. The turbo flows an incredible amount of air and seams to never drop off. I have done 8000 RPM pulls with the airflowperrev and boostest flat lining all the way across the band.