Unfortunately, we do not have any plans to test the 1.15ar housing. We just don't see much of a point since the .84ar and 1.0ar do so well.
KC Drop in s300 turbine with billet wheel turbo testing
- Thread starter KCTurbos
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Unfortunately, we do not have any plans to test the 1.15ar housing. We just don't see much of a point since the .84ar and 1.0ar do so well.
If you change to the .84 I’m willing to bet you won’t go back to the 1.0 for your application.
Side note- Are the SD turbines back in stock?
Yes! They are back in stock.
Charlie, we talked about this when you offered it to me in exchange for the 1st gen drop in. I'm the guy you asked to stop in at your shop last winter, but you were in the process of moving. You were right, the sxe version with the 1.0 housing was an awesome improvement. It's a great drop in turbo. Particularly with the duel Donaldson upgrade. I think the .84 will increment me even closer to what I would like, particularly above 6000 ft and those tight mountain corners? At 70 mph, it's at ~2100 rpm. So, I don't care about some high rpm loss. If I only used the truck in the midwest (east of the Mississippi should be Mideast) I owuldn't change anything.
I'm in a discussion with Dusty about live tuning. Hmm, maybe I should wait with that until the .84 is installed?
I have been emailing with Jim about swapping some 30% or 80% nozzles on my ACs to improve the injection window/PW for efficiency/mpg. So far, he is not keen on that.
I'm in a discussion with Dusty about live tuning. Hmm, maybe I should wait with that until the .84 is installed?
I have been emailing with Jim about swapping some 30% or 80% nozzles on my ACs to improve the injection window/PW for efficiency/mpg. So far, he is not keen on that.
Last edited:
ghohouston
Active member
See i love 1.15 housings. I think i might just copy cat your setup for my obs. It is already swapped over to 3" plenums, sd up pipes, and a stock sd turbo. I hate the .84 housing, way too restrictive imo. Especially with stock size tires/rims, 4:10's and zf5. The correct genuine Garrett 1.15 housing can be had for under $200 brand new, plus the cost of the turbine shaft, and comp wheel, sounds like it will make a budget friendly awesome turbo.
ghohouston
Active member
10-4
Curious what you don't like about the .84ar... what exactly does it do that you don't like.
On the dyno when we tested the .84ar and 1.0ar back to back... the 1.0ar made 2-3psi less boost, 3-5psi less ebp, 10hp less, 50egts less and spooled noticeably slower.
For me... I would take the better power, quicker spool up, and 10 extra hp any day of the week. 5psi of ebp and 50egts won't make/break anything... but the quicker spool up is very noticeable.
Back woods
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For me I prefer the larger turbine wheel of the 1.15/van, especially in SXE form. 2mm larger than many successful S300/68 turbos and in between the 68mm and 73mm version of the S300. Have tossed around the idea of lathing a .84 housing fit. Personally running both .84/68mm and 1.15/70mm turbos with your guys SXE and matching compressors the 1.15 pulls smoother @ towing rpms (2200-2500) Although, I would like to try out a .84/70mm with a 63mm compressor wheel.
My all time favorite so far is 63/73/.84... I think that is going to be our most popular turbo
ja_cain
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Did you ever do a comparison between that and a 38r?
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Swaan
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Probably shouldn't, it might hurt a lot people feelings.LOL
Yep... just need to find time to make a post about it, upload photos, and type up a write up. We did post something on facebook if you wanna check it out. We compared stock vs 38r vs 63/68 vs 63/73
https://www.facebook.com/KCTurbos/posts/2240014902876744
Not sure if I should continue posting all the bigger turbo testing here... or start a whole new thread.
ghohouston
Active member
Im speaking purely from stock turbo perspective. The .84's choke up in the higher rpm range. Cannot comment on any that have been modded.
ja_cain
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Either way, just post it up!
ja_cain
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Hope you don't mind. 
180/30 injectors
Stage 2 HPOP
.84 ar housing
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180/30 injectors
Stage 2 HPOP
.84 ar housing
Sent from my Pixel 2 XL using Tapatalk
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pipedobber
New member
I’m trying to learn more about turbos and injectors. Can someone explain to me where the kc38r fall into this mix? Between garret 38r and 63/68? Is this just different style/setup/version of the kc38r? Thanks, Chris
firehunter
Member
Sigh, had a long response typed and got wiped out...we'll try this again...
Got the SD S300 turbine and 360 degree rebuild kit from KCTurbos and they arrived Friday. Did the install yesterday with great success, about 4 hours to go from running to running including a quick lunch break. The KCTurbos kit is very nice and packaged very well. It is not the most inexpensive kit out there but a very nice kit none the less. Although I have rebuilt this turbo before I always like to have instructions on hand just to verify my memory and have to give RiffRaff credit for an excellent write up on the rebuild process.
The turbine itself is noticeably heavier in hand than the stock turbine but, like others, I don't have the proper scale to measure the difference. Otherwise it looks exactly like what's in the pictures on the KCTurbos website.
First impressions...
Spool Up: Quicker spooling and smoother spooling. When accelerating in O/D (ZF-6) from 1500 rpm I would have a second or two of slow spool then the turbo would light and my boost gauge would jump to what boost I was asking for with my right foot. Now, the turbo immediately begins to build boost and smoothly builds to desired levels (how hard I am on the throttle). Even in second and third gear, while empty, it builds more boost than the old turbine that would build almost no boost (no real load on it). In short, quicker spool and smoother spool - good stuff.
Smoke: Greatly reduced! In the O/D accelerating scenario I described above I would have some black smoke until the turbo lit then it would clean to a slight haze. Now I have a small haze on acceleration that very quickly clears completely. A big and welcome difference. More good stuff.
Shifting: Interesting - the heavier turbine carries more momentum and the boost does not fall off nearly as much in between shifts. This was noticeable enough that I am working on changing my usual shift points. On my first drive I would let the clutch out like I normally would and the truck would almost lurch forward because the turbo was still spinning and engine was making more power than I was used to. A good problem to have especially when pulling loads through the mountains like I usually do.
Shut down: As noted by others, you can hear the turbo spinning for a noticeable longer time after shutting the engine down. I have already had general public look at my truck and wonder what the sound was after I shut it off. :thumbsup:
All-in-all a very nice upgrade! I really like the smooth turbo action now, immediate response, and significant reduction in smoke. All good!
Got the SD S300 turbine and 360 degree rebuild kit from KCTurbos and they arrived Friday. Did the install yesterday with great success, about 4 hours to go from running to running including a quick lunch break. The KCTurbos kit is very nice and packaged very well. It is not the most inexpensive kit out there but a very nice kit none the less. Although I have rebuilt this turbo before I always like to have instructions on hand just to verify my memory and have to give RiffRaff credit for an excellent write up on the rebuild process.
The turbine itself is noticeably heavier in hand than the stock turbine but, like others, I don't have the proper scale to measure the difference. Otherwise it looks exactly like what's in the pictures on the KCTurbos website.
First impressions...
Spool Up: Quicker spooling and smoother spooling. When accelerating in O/D (ZF-6) from 1500 rpm I would have a second or two of slow spool then the turbo would light and my boost gauge would jump to what boost I was asking for with my right foot. Now, the turbo immediately begins to build boost and smoothly builds to desired levels (how hard I am on the throttle). Even in second and third gear, while empty, it builds more boost than the old turbine that would build almost no boost (no real load on it). In short, quicker spool and smoother spool - good stuff.
Smoke: Greatly reduced! In the O/D accelerating scenario I described above I would have some black smoke until the turbo lit then it would clean to a slight haze. Now I have a small haze on acceleration that very quickly clears completely. A big and welcome difference. More good stuff.
Shifting: Interesting - the heavier turbine carries more momentum and the boost does not fall off nearly as much in between shifts. This was noticeable enough that I am working on changing my usual shift points. On my first drive I would let the clutch out like I normally would and the truck would almost lurch forward because the turbo was still spinning and engine was making more power than I was used to. A good problem to have especially when pulling loads through the mountains like I usually do.
Shut down: As noted by others, you can hear the turbo spinning for a noticeable longer time after shutting the engine down. I have already had general public look at my truck and wonder what the sound was after I shut it off. :thumbsup:
All-in-all a very nice upgrade! I really like the smooth turbo action now, immediate response, and significant reduction in smoke. All good!
firehunter
Member
Oh, and I forgot to mention max boost - I can't tell you what it is because both the old turbine and the new turbine will peg my 30 psi boost gauge. I don't ever "need" over about 25 psi which I hit fairly regularly when towing so I set the wastegate to start opening around 30 psi.
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