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Carrera RSR  



Joined: 08 Jan 2010
Posts: 2151
Location: Somerset, UK

PostPosted: Mon Nov 30, 2020 2:57 am    Post subject: Reply with quote

Fasteddie313 wrote:
Last logged run was maxing at 254 kpa and my post IC intake air temp went from a low of 45 degrees F and maxes out at about 95 degrees F through all pulls..

So, I think the IC handles it, but it won’t hold max boost to redline..
The higher I turn it up, the more boost I lose as RPM increases..
Pretty sure that means that’s all the turbo will do at those RPMs/volume flow..
Compressor, or that’s all the 4.10 turbine housing will eat.. Not sure.. Probably both..


Is the USA the last Country in the World using imperial measurements? I see numbers but have no idea what that means......
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
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Cdric  



Joined: 27 Aug 2004
Posts: 2098
Location: Sweden

PostPosted: Mon Nov 30, 2020 4:04 am    Post subject: Reply with quote

He is working with efi, and kpa in absolute pressure is the standard setup. So about 1.5bars of boost. I think you are running out of both compressor flow and are getting high back pressure from the small turbine housing. Time for a new turbo?
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2165
Location: MI

PostPosted: Mon Nov 30, 2020 7:21 am    Post subject: Reply with quote

C�dric wrote:
Time for a new turbo?


Yeah.. Need to find a 6.10 and probably just call places like Lindsey and/or turbonetics about cold sides..
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 2151
Location: Somerset, UK

PostPosted: Mon Nov 30, 2020 10:31 am    Post subject: Reply with quote

6.10 with either 2664 or the 951S 2670 compressor
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
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Cdric  



Joined: 27 Aug 2004
Posts: 2098
Location: Sweden

PostPosted: Mon Nov 30, 2020 9:48 pm    Post subject: Reply with quote

With the big lack of #6 turbine housings, there is reasons to go with a more modern turbo if you want to go nuts. The 2670 is nice, but wills start to be seriously unhappy above 1,5 bar, as most compressors designed for production engines. But that will probably be above 300hp, so it will move.



Otherwise I think an adapter like the one i have in my storage would be a good solution, and maybe put a TD05 mitsubishi charger on there. If you are really serious about it I can pick up my engine simulation model and we can try finding a good match.


[img]https://www.bildtagg.se/file/thumb/6tj1ctwqsbp4tfrzctqt9wss[/img]
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Mike9311  



Joined: 14 Dec 2004
Posts: 1040
Location: Chicago-ish

PostPosted: Tue Dec 01, 2020 1:25 am    Post subject: Reply with quote

That is a neat adapter. Very straightforward even to play around with ideas as apposed to Joakims first build with the welded on adapter which is a bit more permanent

This just requires boring out the inducer inlet of an S1. Very likely something like it on Ebay without the taller exducer tips to make the cold side modding easier of the 944 housing. But Cedrics adapter would easily open the door to lots of things easier than this


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Cdric  



Joined: 27 Aug 2004
Posts: 2098
Location: Sweden

PostPosted: Tue Dec 01, 2020 7:54 am    Post subject: Reply with quote

There are several options for the compressor side on the k26, the issue here is the lack of turbine housings. There are of course non 931 turbine housing for the k26, but then you need an adapter and could aswell go with a more modern turbo instead.
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2165
Location: MI

PostPosted: Tue Dec 01, 2020 9:32 am    Post subject: Reply with quote

Really wanna stick with original 931 hot side and bearing housing stuff..

The k26/6 comp is really smaller than the 2664 931 comp?
Man, I really thought I remembered it being a bit bigger when it was in my hand..

I’m pretty convinced that this engine can handle pretty serious cylinder pressures.. Haven’t even blown the HG yet..
Think everyone is scared of all the non-intercooled and/or non-AFR controlled horror stories..
Isn’t this engine originally a diesel bottom end?

IDk.. I know I shouldn’t but I’m addicted..

Wonder if Borg Warner still makes/sells compressors to fit k26s..
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Cdric  



Joined: 27 Aug 2004
Posts: 2098
Location: Sweden

PostPosted: Tue Dec 01, 2020 9:57 am    Post subject: Reply with quote

the K26/6 compressor from the 944 is 2667, so in between the 2664 and 2670. A good intercooler can mask the compressor getting into the wall, but it will demand a massive ammount of turbine energy when it tries to keep the boost out of the efficiency range, which means the wg is closing and building alot of backpressure. This is combination with a to small turbine housing is not the best combo,so ideally you would go with both of them larger. There is a plethora of hybrid K26/k27 variants, so alot could be done if you would like to go nuts, only your wallet and head gasket will put the limits on the fun, or maybe some detonation
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Fasteddie313  



Joined: 29 Sep 2013
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Location: MI

PostPosted: Tue Dec 01, 2020 12:24 pm    Post subject: Reply with quote



Look at that AFR line tho...
Whew thats smexy..
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Last edited by Fasteddie313 on Tue Dec 01, 2020 12:45 pm; edited 1 time in total
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2165
Location: MI

PostPosted: Tue Dec 01, 2020 12:33 pm    Post subject: Reply with quote

C�dric wrote:
the K26/6 compressor from the 944 is 2667, so in between the 2664 and 2670.

This is what I figured..


C�dric wrote:
ideally you would go with both of them larger. There is a plethora of hybrid K26/k27 variants, so alot could be done if you would like to

Yes please..

Need to at least blow the HG right?

Eurobros: come on with the 6.10 hookup..
(scratches neck vigorously) I needs it..
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Cdric  



Joined: 27 Aug 2004
Posts: 2098
Location: Sweden

PostPosted: Tue Dec 01, 2020 9:02 pm    Post subject: Reply with quote

Ill throw out a WTB on the local transaxle board, maybe someone have something laying around.
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924RACR  



Joined: 29 Jul 2001
Posts: 8386
Location: Royal Oak, MI, USA

PostPosted: Tue Dec 01, 2020 11:33 pm    Post subject: Reply with quote

Yeah, that AFR looks nice, but I have to say I think the RPM trace is still a little wobbly... I forget, are you using the distributor still?

Mine was really wonky/bouncy when I still had the stock ignition and distributor; after switching to direct coil fire no moving parts it's now smoother than that.

No image hosting, I'll send you a pic on Messenger Eddie...
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 2151
Location: Somerset, UK

PostPosted: Wed Dec 02, 2020 3:13 am    Post subject: Reply with quote

Fasteddie313 wrote:

Eurobros: come on with the 6.10 hookup..
(scratches neck vigorously) I needs it..


Getting rarer. All are pretty much cracked. Ive reused cracked turbine housings on my car. I reckon a NOS one would last a few heat cycles before cracking anyhow.

Someone needs to start casting new 6.10's turbines or recasting a 4 bolt exhaust manifold so we can use a 944 K26/7 or a version V band ready.
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
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Cdric  



Joined: 27 Aug 2004
Posts: 2098
Location: Sweden

PostPosted: Wed Dec 02, 2020 4:08 am    Post subject: Reply with quote

My turbo was like new, probably less than 100km on it, already cracked. A new casting would be nice, even though its a niche product, so miniscule volumes=high price. But if i remember correctly that was discussed not that long ago in a thread on here.
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