turbo education

[ellis93]

I was looking at different turbo options for the 82.....for when I start hogging the fuel to it. And I've seen a bunch of you talking about the s300 based turbos and the like.
I know jack schit about them and would like to know more....at least a general idea,summed up to where a simpleton (like myself) could understand.

Take for instance this turbo:
Check out this item I found on eBay:

End time: Mar 20, 2014 10:29:06 AM

Item: New Borg Warner Airwerks S363 S300SX Turbo 63/68 .88

URL: http://pages.ebay.com/motors/link/?nav= ... 1245841413

Alt URL: http://www.ebay.com/itm/New-Borg-Warner ... 1245841413

All I can tell about it without reading the drumed up sales pitch is that it looks to have an open t4 flange. I can't make heads or tails about the rest. What the crap is this .88 housing business,and what do the sizes usually equate to in cm.....I understand cm. is there some formula that converts this decimal crap to cm,or a chart somewhere?

Shoot me straight on this because I am trying to learn.....links are good to

Ellis Fortenberry

[cmann250]

If RC does not see this, I'll try to help at lunch. Everyone but Holset uses A/R, the decimal format.

[ellis93]

[DMan1198]

If I'm right .88 equates pretty close to a 16cm housing (based on a .7 housing is roughly 12cm and .8 is roughly 14cm)

[RCCUMMINS89]

There is no set in stone conversion to a/r and cm. There are a few variables that change (foot size being one) if a .70 is a 12 or not. So most of us go off from what places like Industrial Injection, or High Tech Turbo say it is. In saying that..... they some what figure that a .70 is a 12, .80 is 14,

Non divided turbos spool like crap. For example a .80 divided has a better spool up/response time than even a .70 undivided.....yet, the .80 still flows a lot more.

Also.... the "normal" S300 turbos in stock form only have a 3 pad (180 degree) thrust bearing assembly. Where as some of (like mine) companies that sell "custom" S300 turbos have either a 6 pad (BORG WARNER'S STRONGEST BEARING) or an aftermarket (non Borg Warner) 360 degree thrust bearing. I use the 6 pad in my chargers. Industrial Injection's 360 is a hell of a thrust assembly, even though it is "aftermarket" it is pretty darn good.


That 63/68/.88 link that you found on EBay.... that is the p/n that nearly all of the 63/68 chargers that we buy as bolt ons are built off from.

From there it receives a different compressor housing for a 12 valve application, it gets taken apart and a high pressure ratio thrust bearing gets installed, and then the proper turbine housing gets installed.

[Remps]

Diesel Power magazine did a 6 way turbo shootout in the November 2013 issue. Too bad they didn't include a gt3782r, woulda been nice to see how it stacked up against the others.

[ellis93]

Eric.....why the upgrades,what significance are each modification?

[RCCUMMINS89]

Thrust bearing is not necessary and would save $100 from my pricing. Reason I do the thrust bearing upgrade, is so that the turbo can last at the boost pressures we put it at. Keep in mind that in stock form these turbos were designed to be used at 12-15 psi range.... not 40+ that we put them through at times.

Turbine housing.... T4 sucks and will spool at about 2500 rpms (ok maybe 2200, lol). We pretty much have to have a T3 foot in order for it to work and spool correctly on a ve pumped Cummins, or 12 valve for that matter. The wastegated vs non gated housings are a choice matter.... but again, the extra $300 for a gated turbo is worth it IMO for a performance application. It allows one to use a smaller turbine housing (gaining massive spool up) without choking the dog crap out of it at high boost levels. Again, remember that we operate these turbos in a 40 psi range, where as stock form they operate in a 15 psi range.

Compressor housing upgrade..... is not necessary for the do it yourselfer. It is necessary for the bolt on operation.

[ellis93]

What's the aftermarket compressor suppose to achieve! Move the map around,make the turbo more efficient at a greater boost?

[RCCUMMINS89]

After market compressor HOUSING (sorry)....it is only so that it has a 2.5" v-band style compressor outlet.

[ellis93]

Oh so it's all just fit and function for ease of installation? I understand then.

What's the optimum wheel sizes for how much given fuel? General idea ain't holding you to it kinda thing

[ellis93]

What's the aftermarket compressor suppose to achieve!(ment ?) Move the map around,make the turbo more efficient at a greater boost?

Edited to not look like an ass

[RCCUMMINS89]

Solely depends on the fueling.

However.....on the turbine side... figure 65 wheel for 450, 68 wheel for 500, 71 wheel for 550. But again though, it really depends.

There is a common rail, with my EXACT same turbo (except .80 housing, which I originally had on it) that is making 686rwhp....

[ellis93]

Next question,which exhaust housing would be best for towing....not everyone needs a billion HP.

[RCCUMMINS89]

.70 , you have a manual trans.

Don't let folks convince you that small housings run hot. They don't until they become restrictive... at the point that they become restrictive... gate it at that. Trust me that'll be higher than the psi that you tow at.