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3LDZ vs. K-27

I have seen many adds for rebuilding the stock 3LDZ Turbo with a high flow capacity. How does this compare to the K-27s? I am looking to reduce turbo lag and improve the acceleration vice the top speed. I am thinking that the headers/exhaust are first, large Intercooler and then the turbo.

It would appear that rebuilding my 3LDZ with the high flow parts goes for around $600 where the K-27's start at $1400 and go up from there.

It would appear that the headers/exhaust upgrades show between 45hp to 55hp improvement over stock. The KOKELN Intercooler folks say that it reduces the rpm where boost comes on about 1000rpm sooner than stock. So with all of that, it appears that the boost is comming on at around 2200 RPM or so. So is the extra $1000 for the K-27 over the rebuilt stock turbo really do much for you.


I would love to hear from the forum about their set ups and what they like/ don't like.

Thanks,

Mark

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Mark

1986 930 Ultra-Smith RUF Slant Nose conversion, RUF VB, K-27 HF-S, B&B Headers and Exhaust, RUF Short Shifter, RUF Interior

Last edited by 1986 930; 07-25-2011 at 01:24 PM..
Old 07-25-2011, 01:21 PM
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I handle all of these items and have tested most of them against each other on the same engine. Each has their own niche and bang/buck.
Turbos - the 3LDZm (as I call it) when compared to the OEM 3LDZ does spool quicker but not quite as quick as the K27-7200. The value that I see in this turbo is 2-fold; cost and it is a true bolt-on.
Headers - the standard short tube headers will add about 30WHP to a 300WHP 930. Boost threshold of a 7200 is reduced about 500rpm, a bit more for a 3LDZ as it is so laggy to begin with.
Intercoolers - do not reduce threshold that I have seen unless the IC is compared to threshold degradation due to hot ambient temperatures. IC's allow more power by cooling the charge air so the bigger the better to a point; where a drop in pressure begins.
My opinions may be considered bias so others please weigh in with your experiences.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 07-25-2011, 02:02 PM
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Right now I have the 3LDZm from Brian along with a Kokeln intercooler and free flow exhaust. My lag has been much lessened and as of this point feel no need for a k27. Of course in the future if I come into some extra cash I would buy a better turbo.
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'87, Modified WUR, Billet valve, 965 downpipe, Kokeln intercooler, GHL headers, Garrett T04B K27 hybrid, Tial w/.8 bar, WEGO IV, RarlyL8 dual out, LSD
Old 07-25-2011, 03:30 PM
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I have the 3LDZ with the coldside upgrade and a 1 BAR spring in the waste gate mounted on stock exhaust with a Borla 1 in 4 out muffler on an 88 turbo.

The car also has a fuel enrichment system.

The boost gauge starts to rise about 2200 and holds 1 BAR to 6,000+RPM's

I think it was money well spent for street use
Old 07-25-2011, 06:18 PM
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Good stuff! I have been on the road for awhile and the 930 has been in the shop for a long time as well. 26 years of limited use is playing havoc with the CIS. The previous owner drove it 5k miles in 12 years.

Thanks for the info guys.

MM
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1986 930 Ultra-Smith RUF Slant Nose conversion, RUF VB, K-27 HF-S, B&B Headers and Exhaust, RUF Short Shifter, RUF Interior
Old 08-11-2011, 08:31 AM
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As I understand it, the bigger the Intercooler, typically the greater the turbo lag. (Since there's a larger volume of air to fill and push thru with the boost pressure.)
Old 08-11-2011, 01:45 PM
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I have a 1988 with the stock 1988 headers and a RarlyL8 exhaust and K27S turbo. Comparing the current setup to the previous stock 3DLZ turbo and cat/muffler is night and day. Not sure what made the most difference (K27 or removing the cat), but it is night and day.

Since then have replaced CIS with EFI and I think I have almost the perfect mild street tuned 930. Runs great off idle, ramps up smooth, pulls to redline with no fuel or ignition issues.

I'd recommend the turbo and free flowing exhaust before spending on the headers.

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1988 930 coupe - Silver Metallic
3.3L w/GT35R, B&B Headers, RarlyL8 muffler, TurboKraft IC, Tial WG, tecGT based phased sequential EFI & ignition, Wevo shifter/coupler, ...
Old 08-11-2011, 03:23 PM
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