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turbo 4.10 vs 6.10???

 
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924-76  



Joined: 05 Jun 2006
Posts: 1356
Location: Ontario, Canada

PostPosted: Tue Sep 12, 2017 7:16 am    Post subject: turbo 4.10 vs 6.10??? Reply with quote

Did some reading here and I can't find the answer, what is the difference between a 4.10 and 6.10 turbo?
How this difference would translate on the road/car feel/spool/lag/etc..?
Thanks
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1976 924 N/A ROW SOLD
1980 931S
1981 931 Part car RIP
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WEASEL149  



Joined: 19 Aug 2005
Posts: 592
Location: UK, Sheffield

PostPosted: Wed Sep 13, 2017 2:09 am    Post subject: Re: turbo 4.10 vs 6.10??? Reply with quote

924-76 wrote:
Did some reading here and I can't find the answer, what is the difference between a 4.10 and 6.10 turbo?
How this difference would translate on the road/car feel/spool/lag/etc..?
Thanks


The number is the turbine housing nozzle/volute size.
The 4.10 is smaller so gives better response at low revs but causes more back pressure at high revs.
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924-76  



Joined: 05 Jun 2006
Posts: 1356
Location: Ontario, Canada

PostPosted: Wed Sep 13, 2017 2:20 am    Post subject: Re: turbo 4.10 vs 6.10??? Reply with quote

WEASEL149 wrote:
The number is the turbine housing nozzle/volute size.
The 4.10 is smaller so gives better response at low revs but causes more back pressure at high revs.

Exactly what I was looking for, thank you
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emlynbeagler  



Joined: 22 Jan 2007
Posts: 9
Location: Llandovery, UK

PostPosted: Thu Sep 21, 2017 6:48 am    Post subject: Reply with quote

I replaced the 4.10 turbine on my Series 2 931 with a 6.10 from the S1, mated to the later compressor. I recommend doing the same. It spools up a tiny bit later (there's loads of lag anyway), but blows right up to 7000rpm (or what the tacho tells me is 7000rpm) and makes the car much more eager if you keep it spooled up. I have done 12,000 miles since tinkering with the turbo (on an engine that has now done 240,000 miles without a rebuild) and everything seems ok. There is a reason that 0-60 is about half a second slower on a stock S2!
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