Geoff,

Could you pleae give us some information on the BW S300V? what is the power range of the turbo? what would the spools times be? Are there any larger VNT turbos out there that could be used?

Regards,

Chris.

 

Hey Geoff,

Im looking to order a turbo in the next few days, cant decide on what i want still
what i want is the Largest looking turbo possible, that will still spool decent.

Im looking for the Largest looking turbo that you think would spool decent.
motor setup 9.5:1 comp, and will be running on e85, head has been port n polished, currently stock cam, but will more then likely change by the time its running in February.

Ive always like the race covers on the s372 turbos i always thought it made them look crazy large. but it isnt a 'have to have' thing. and that turbo i believe is way to large.

Car is mostly for drag, and highway pulls, and the manifold were building will be rather large, 24-26inch long runners counting the collector.

(hate to say it, but the new setup were doing is mostly for LOOKS rather then function, so going big might not work out perfect, but it will still be a huge step up and its what i have now)

I was told to stick with something like the s300sx 83/75, it looks massive compared to anything else in its class and im upgrading from a 60 trim t3/to4e that i thought spooled absolutely fine, do you have any comparison pictures of the s300sx 83/75 to a 91/79 and a s372? (is there a big size difference?)

i figured the smallest turbo i wanted to go with would be the s300sx 83/75 unless u have a suggestion for something that looks larger and will spool as well if not better.

oh, and is it possible to get the s372 racecover on the s300 83/75? (donno why i thought of that, or is there something like the s372 with rc that spools as well as the s300sx 83/75?)

Sorry, alot of questions im bombarding you with, but the comparison picture of the 3 turbos is definitely one thing i want to see and also get your suggestion on a turbo i should go with. Cars mostly for show, drag and highway pulls.. It is driven on the street, but mostly just for fun, and the laggier turbos i actually think suit my driving style alot better, it allows me to drive around town moderately without really getting heavy into boost, if i can shift gears at wot and stay in boost its not to big for me!

Thanks

Daniel

 

After seeing the interest for a 67mm drag racing class, ive been asking BW to build a turbo specifically designed for this 67mm class rulebook: http://full-race.com/prototype/twins.../67mmRULES.jpg - here are some pics of the S400SX 67mm, the compressor wheel is capable of 88 lb/min


^42R sized inlet


^high efficiency extended tip compressor wheel


^excellent turbine blade inlet tip curvature


^vband connection from housings to center section

This was built to be a direct drop-in for the GT42R and S400SX (aka 372) so all the guys who have a big runner t4 twinscroll manifold w/ 4" downpipe wouldnt have to change anything to run this turbo

 

Im so on this LOL

 

Whats the exhaust wheel specs on this new turbo? For somebody who is not a class racer, just wants big power how do you think this new turbo will do against the "s372" as far as spool/response time goes?

Have that 91-79 been tested yet.

Fathouse

 

the S372 is what bullseye has renamed the Borg Warner S400SX *71mm*. Why bullseye named it that makes no sense because its an S4 series turbo with a 71.08mm inducer.

All the S400SX turbos have the identical outer dimensions, the difference is that the 71.08mm compressor wheel flows 92lb/min, this 67.7 flows 88lb/min.

 

I was never a fan of the BEP rename style, but its easier for most to remember. I dont get the S372 rename either, but I think its because they dont want it confused with the K31 71mm wheel. I think they also call it the S372 because it uses the 83mm turbine rather than the 96mm. Keeps things simple, but its definitely not correct.

 

hey chris sorry i wasnt able to post up sooner. Basically the S300V is a somewhat exotic turbo available in a few configurations ranging from 61mm to their 66.7mm with billet ti compressor wheel. The "VTG" housing as they call it is a PWM signal 0-5V and certainly possible to control with most any standalone. The main issue is that it really needs to be run on E85 in order to keep the EGT from overheating the vanepacks. What kind of airflow rates are you looking for and what is the engine spec? The only safe way to use a VNT aka VTG turbo on a gasoline engine's EGT is to use dual BV50's, but thats much more expensive


here is a good comparison photo of the garrett 40R vs precision 67 vs BW S300SX 83-75 (88-75 and 91-79 are the same size as this)


its pretty interesting to see how much larger the BW 83-75 is compared to the 40R garrett and precision

I agree 100% the 83/75 could work very well for your application. If you plan on using the stock cams for a while it makes the most sense to be on the 83/75, once you get the bigger cams in the 88/75 could give you additional top end. You absolutely should never use anything giant oversized compressor housings like you asked about

The turbine housing you select depends on the manifold design - twinscroll (divided) or singlescroll (undivided). If you are buiding the manifold yourself its a good idea to build a divided T4 manifold pairing cyls 1/4 and 2/3. Also ~30-40% shorter runners than what you are thinking would be a good idea. Bigger cams are a must, especially if you have headwork... the stock cams will not work well with headwork and a big turbo

 

Thanks for the info geoff. At the moment im just intresed in the turbos. What kind of HP rating would you put on the 61mm and the 66.7mm? how would these compare in spool, size and cost to the same HP capable Garrett turbos?

Cheers

Chris.

 

So the "s372" that everybody is running on honda-tech is a bep turbo with a considerably smaller turbin wheel than the actual BW version, the sx400-71?

Why does it need to be so confusing lol I just want to go fast!!!

Fathouse

 

no, the 372 that everyone on honda-tech uses is the identical turbo to the S400SX 71mm. Same turbine wheel, same compressor wheel, same center section, same housing options (42R style or "race" style with the velocity stack in the ported shroud), etc. its just this turbo:





here are some pics of the S300V, it is a very large turbine and 4" vband outlet:










ill try and post the compressor maps up later tonite

 

Goeff, thanks, it can get a little confusing at times

Is there a advantage to running the race cover, assuming space is not a concern. It is a little larger correct?

Fathouse

 

the race cover is frickin HUGE. many honda drag racers have claimed to pick up power, but I have not tested it. Generally it is rare to see significant gains from a compressor cover, and the BW guys agree there is likely little if any gains to be had, but it is certainly possible at 45+psi it will pick up top end

 

Right on, I have heard some pretty crazy claims about the race cover, to good to be true stuff lol. I do like the standard style outlet vs the vband though.

Fathouse

 

What Geoff said.

There are some gains, but its nothing insane. If you want to squeeze every bit of power out and dont mind the $300 extra, sure. For the most part, its not necessary or really worth the money.