Borg Warner S380 reports

[Alky V6]

I've got ants in my pants and I'm ready to upgrade the turbo. I'm taking a serious look at the S380. I've seen some unbelieveable reviews on the web and was wondering if anyone has anything to add.

I'm looking at the R comp housing and a 1.25 a/r turbine housing. Planned output around 1200 HP. Still using my nitrous system for initial spooling.

 

[JZ 97 SS 1500]

We have had great sucess with our BW units and all our dealers and distributors seem to love them. We have built quite a few for the GN guys, most of them running the 1.00 and 1.1A/R housings. I know one of the guys on here has out ST80R and 1.1A/R and made some stupid #'s on the dyno. He already has taken it off and has gone to the FI91X which will make ALOT more power. The 91X flows over 165lbs/min and is almost a drop in fit to a GT47-88 and GT55-91...its just a touch longer in size. Will be interesting to see how it all develops.

 

[Alky V6]

I think 1200HP is going to pretty much max out these heads. Not looking for anything more out of this engine config. JZ, with a 224 cid, a shift point of 7,200 rpm and nitrous to spool the turbo, do you think the 1.25 would be too large? Maybe just start out conservative with a 1.1? I'm presently using a .96 on an old T76 single bb, Q trim turbine. BP ratio at 24 psi boost is just under 1.6 to one.

The planned max boost with the next turbo will be 40 to 45 psi. Is the S380 still plenty efficient in this region?

 

[John Wilde]

Don,

I would think that with your destroked combination that you are
leaving a lot on the table setting the car to shift that low.
In addition please keep in mind that going with alky as your primary
fuel you need to run a more turbine housing to avoid back pressure issues.

 

[Alky V6]

Don,

I would think that with your destroked combination that you are
leaving a lot on the table setting the car to shift that low.
In addition please keep in mind that going with alky as your primary
fuel you need to run a more turbine housing to avoid back pressure issues.

You could be absolutely right about the shift point. The present turbo is dropping boost level after around 6800 rpm. With a turbo that can maintain a set boost level it could well turn out that a higher rpm shift point would be better. Thanks for bringing up that point.

Even so, the highest rpm the valve train is setup for is 7,800 rpm. Most likely, even if the power is there with the next turbo, the maximum shift point would be 7,500 rpm.

 

[JZ 97 SS 1500]

The turbo will still be efficient at that range boost. For the #'s you are planning though I would stick with a 1.25 A/R housing. Your asking alot of that turbine wheel at those levels of power. The next step up would be the SX80 which uses a 88mm turbine wheels versus the 83mm one used in the smaller unit. You will sacrifice some spool, but backpressure won't be as much of a concern as the other turbine wheel. Also yes alky makes a big difference in exhaust volume. Your looking at around 35-45% more fuel being burned per hp versus regular fuel.

 

[Alky V6]

My main concern is efficiency in the 35 to 45 psi range. I know from the published compressor map of the GT4718 that it would be well suited for my plans, but if the S380 is in the same ball park, and from other reports I've heard about the S380, I would prefer going with the BW product.

 

[Alky V6]

JZ. With my target HP level of 1200, do you think the smaller turbine wheel will allow me to achieve that with my engine config? If it's borderline, then what are we talking about. Going to a T6 style mounting flange?

 

[JZ 97 SS 1500]

JZ. With my target HP level of 1200, do you think the smaller turbine wheel will allow me to achieve that with my engine config? If it's borderline, then what are we talking about. Going to a T6 style mounting flange?

T6 would be better suited for that level of power. Also you may want to think about the larger 88mm turbine wheel. Give me a shout Mon. and we can talk. Also we have a few new things now as well.

 

[Alky V6]

T6 would be better suited for that level of power. Also you may want to think about the larger 88mm turbine wheel. Give me a shout Mon. and we can talk. Also we have a few new things now as well.

I will certainly do that. I want to learn about the 88 wheel. Many thanks JZ.

 

[bison]

Otto J ran one of those i believe. It seemed to be choked down quite a bit over 1000 hp. It was the exhaust side that seemed to be the problem. Car didnt pick up much at all when the boost was cranked.

 

[JZ 97 SS 1500]

Otto J ran one of those i believe. It seemed to be choked down quite a bit over 1000 hp. It was the exhaust side that seemed to be the problem. Car didnt pick up much at all when the boost was cranked.

Well if its was a T4 based unit then yes. You can only flow so much through a T4 flange.

 

[WHITE T]

Don,

Whatever you learn keep us update on this thread, I am also very interested in the BW turbos and there is very little info on here about them.

Thx!

 

[DFISCUS]

I used to think the T-4 housing would chock down my 47-88 until I tried one and the car went just as fast(8.31@167.82). Not too shabby for a tso car at 3400 lbs. I say go with the T-4 if it's a 47-88.

Dave Fiscus

 

[John Wilde]

Dave,

Based on the guesstimate that a 1200HP alky engine will have to produce
similar exhaust to a 1700HP gas motor, based on your experience do you think the T4 housing will work on Don's application?

 

[JZ 97 SS 1500]

I used to think the T-4 housing would chock down my 47-88 until I tried one and the car went just as fast(8.31@167.82). Not too shabby for a tso car at 3400 lbs. I say go with the T-4 if it's a 47-88.

Dave Fiscus

The T4 housing made for a GT47-88 is kind of a oddball. Its really just a T6 housing casted with the T4 bolt pattern. Scroll volume is still the same as the T6 variant. Also Alky makes a big difference in exhaust volume as I stated before.

 

[Alky V6]

Don,

Whatever you learn keep us update on this thread, I am also very interested in the BW turbos and there is very little info on here about them.

Thx!

I certainly will.

 

[WHITE T]

Thx!

Hey.. just out of curiousity..

Are we actually taking about the S480? (not sure what the S380 is..)

Also.. from my understanding.. The one (and only) downfall I saw when looking into the BW turbos (granted it was earlier last year) was all the housings were large a/r ratios.

Thx for all the info Jose! (good question Donnie!!)

 

[Alky V6]

I believe at this point, we are talking about the S480.
S380 = T4 mounting and turbine housing.
S480 = T6 mounting and turbine housing.

 

[JZ 97 SS 1500]

Thx!

Hey.. just out of curiousity..

Are we actually taking about the S480? (not sure what the S380 is..)

Also.. from my understanding.. The one (and only) downfall I saw when looking into the BW turbos (granted it was earlier last year) was all the housings were large a/r ratios.

Thx for all the info Jose! (good question Donnie!!)

They are limited from the factory. As an engineering house we can build pretty much whatever you can think of from BW, GT or Tnetic. Just have to think the combo out....just cause it looks good on paper doesn't mean it works.