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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,136
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There's a lot of dynamics I'm sure (and I'm overly simplifying), but bigger turbos equals bigger power simply because:
1. Bigger compressor (in general) produce less heat at same airflow 2. Bigger turbine and turbine housings provide greater "torque" (less back pressure). Couple together equals more power. The trade off? Lag. But, modern turbos have came along ways! Smaller compressors are delivering more airflow and turbines have gotten less restrictive and decreasing back pressure. There's the dynamic part. 60mm on one turbo brand may flow more/less than another 60mm. |
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02-13-2015, 10:19 AM
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Join Date: Dec 2001
Posts: 4,313
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I talked with Bob at Durabuilt about modifying the 3dlz. He implied by the time you add in machining & labor you'd be better off going to a k27. He felt the 3dlz was good up to 325 chp. So staying with a K27 either the 7200 or 7006 seem to be the viable alternatives?
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Harold '79 930/DP935 (sold) '68 VW 3.3 Turbo Crewcab |
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04-27-2015, 08:07 AM
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I'm running a modded 3ldz (because my race regs require original turbo). But I'm not complaining about it. Talk to rarelyl8.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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04-27-2015, 11:09 AM
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Registered
Join Date: Oct 2013
Location: Seattle, WA
Posts: 1,083
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For reference my 3LDZ managed 331whp.
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- 86 Porsche 930 - Mr.Hyde - 86 BMW 635CSi - Dr.Jeykell - 2006 Infiniti M45 Sport https://medium.com/@crashingdoor |
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04-27-2015, 11:14 AM
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Join Date: Dec 2001
Posts: 4,313
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Alan: What's your h.p.? Did you feel a difference from stock to modded?
16Volt: Is the 3ldz stock? thanks.
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Harold '79 930/DP935 (sold) '68 VW 3.3 Turbo Crewcab |
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04-27-2015, 11:52 AM
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Registered
Join Date: Oct 2013
Location: Seattle, WA
Posts: 1,083
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Quote:
B&B Headers/Exhaust/Intercooler SC regrinds
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- 86 Porsche 930 - Mr.Hyde - 86 BMW 635CSi - Dr.Jeykell - 2006 Infiniti M45 Sport https://medium.com/@crashingdoor |
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04-27-2015, 12:32 PM
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gumba; my mods are on bottom of posting. I sourced the modified 3ldz thru rarelyl8.
Just did dyno run last week after putting engine back together. Tuning still off somewhat. More to come I think. But power curve was linear and strong up to 5800 rpm where we stopped run. Regards Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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04-27-2015, 12:46 PM
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
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Interesting. I suspect with the originality craze in full bloom, there will be a lot of folks looking to hide some extra performance inside the guts of a 3LDZ. Talked to Chris @ TK long ago about this topic and he echoed the remarks above: K27 is better in every way and throwing work into a 3LDZ, although possible to improve perf, is still an endeavor suited only to special circumstances... like race regs.
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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04-27-2015, 01:12 PM
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I have since discovered the 930S came out with a k27, so that would let me move to another turbo. But this one seems to be doing OK at the moment. At the point of turbo rebuild I may change. But to answer original query completely, the M3ldz has more mid range/top end power. It just keeps pulling - up to 6000 at least. Brian suggested earlier boost onset - I'm not sure about that, but I don't think I lost anything there. It was a definite gain switching to the modified form.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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04-27-2015, 04:16 PM
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