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Join Date: Jan 2004
Location: Sacramento
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Try the HF but just watch you boost gage. You might be ok at 1 bar but have creep at .8 bar. If you do have creep it is often possible to use a .7 bar spring and a EBC to keep boost at 1 bar.

If that fails, then two BOV's are needed for a fix it but you set them both at the target boost, not one high and one low.

Part of this depends on the exaust set up to. Just try it with your stock .8 bar spring.

Good luck.

Old 02-25-2009, 07:18 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #81 (permalink)
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Just another data point...my motor:
3.5L P&Cs
964 cams
Extrude honed 930 heads w/964 valves (twin plug)
964 style longneck intercooler from Powerhaus
Motec M48 (dual map)
B&B headers with open exhaust
Stock Carrera intake
GT-35R with small exhaust housing

Doing a bit over 500 @ 6000rpm at the crank at 1.1 bar. A/F ranging from 12:1 down to about 11.5 at max hp. Had significant problems with boost creep and had to modify wastegate circuit by improving wastegate input tube and using Tial wastegate.

Marcus
Old 02-25-2009, 10:38 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #82 (permalink)
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Location: Atlanta Ga
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For what it is worth I have a pair of gt28rs on a 3.8L putting down 608 RWHP with no issues no surge no oiling problems no smoking and I am making 1 bar at 2600 rpms

I love the garrets I picked up 100 rwhp from switching from a pair of Kkk k24's
with no other mods other than changing out the flanges.

PS they are for sale $1400 for the pair if anyone has a need for a pair theses would be sick on a 3.3. or 3.4 motor. we are going with a pair of gt3076r.

thanks David
Old 02-25-2009, 04:50 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #83 (permalink)
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A little late to this but I have a 1 bar with K27 HF , B&B headers and a magnaflow muffler. Rough guess is I am at around 380 rwhp in my 3.6T. I was at 356 with the cat in place (dynoed) and it is much more powerful now. (waiting to be dynoed)

I have no issue with boost creep, full boost used to be at 3200 rpms I would say it is closer to 2800 or less now without the restrictive cat. Power is very linear with remnants of the old punch in the backside of it in factory form. Throttle control is worth the cost and makes the car so much better and easier to drive hard. Pulls strong all the way through redline and so far so good. I monitor my boost and AFR using David's gauges which IMO are worth every penny.

Of all the high HP EFI conversions I know of the Garrett seems to be the better choice although for most applications especially using CSI the K27 variants are great.

BTW I don't know where .7 bar is coming from The 91-92 turbos here is the factory TSB on this

TSB. Number 9032 9307.

Reads:

Concern: The boost gauge in 1994 911 Turbos will only read 0.7 bar at max boost

General Information The boost pressure for 1994 3.6 liter 911 turbos is .79 to .85 bar. 1994 911 Turbos are equipped with a boost gauge that is only capable of registering 0.7 bar. For technical reasons, the software for the boost pressure gauge was taken from the 3.3 liter 911 Turbo.

Should a 1994 3.6 Liter 911 Turbo have a customer complaint or "car will only reach 0.7 bar boost," the complaint must be verified and boost pressure must be checked before repairs are performed.

If boost pressure is within specifications, no repairs are necessary.

Repair Information: 1994 3.6 Liter Turbo Max boost 0.79 to 0.85 bar 1992 3.3 Liter Turbo Max boost 0.75 to 0.81 bar

Damage code 903210 0002
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Last edited by Cobalt; 02-26-2009 at 09:32 AM..
Old 02-26-2009, 09:27 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #84 (permalink)
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I owned a 91T and can confirm the gage only reads to .7bar. However boost was near the same as all 3.3 930 of near .85 bar.

Not all 3.3's with HF's will boost creep. A 3.6 gulps more air and may not have the same issue as a smaller 3.3.

Still, I would not put a HF on a C2 turbo without a secondary boost gage or leaving the over-boost switch in place to monitor for possible over-boost.

However, I am not an expert.
Old 02-26-2009, 10:50 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #85 (permalink)
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ps:

On my C2T with thicker re-cored IC, SC cams, ports, euro injection, mapable WUR/fueler , B&B and Borla; I had an HF with a larger 7006 hot wheel (pre zero clearance) in it and I still had issue with boost creep. I had to go to a .7 bar WG and use an EBC to hold my boost under 1 bar.

That dose not mean otheres will have the same issue.
Old 02-26-2009, 10:55 AM
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Quote:
Originally Posted by 911st View Post
I owned a 91T and can confirm the gage only reads to .7bar. However boost was near the same as all 3.3 930 of near .85 bar.

Not all 3.3's with HF's will boost creep. A 3.6 gulps more air and may not have the same issue as a smaller 3.3.

Still, I would not put a HF on a C2 turbo without a secondary boost gage or leaving the over-boost switch in place to monitor for possible over-boost.

However, I am not an expert.
I agree.

There is no point in bypassing fail safes set by the factory. Although the pumps cut out between 1.1 and 1.2 bar which is quite high. A lot of boost creep appears to come from header design and WG pipes that are restrictive.

David's gauges do a great job of monitoring your max levels and I highly recommend having an accurate form of monitoring both AFR and boost if you plan on playing with the WG. As others have said a boost controller is not a bad security blanket either.
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Anthony PCA affiliate '77 member '83 '90 3.8 RS tribute, '93 964 C2, '93 928 GTS 5 speed, '94 Turbo 3.6, M '15 Boxster GTS18 Macan GTS
Gone worth mentioning '71 E '79 SC, '79 built to '74 3.0 RS tribute (2390 # 270 hp), '80 928 euro 5 speed, '74 2.0l 914, '89 944 S2,'04 Cayenne TT '14 boxster, '14 Cayenne GTS many others
Old 02-26-2009, 10:59 AM
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The dual waste gate design is well suited for high volume tubos such as the K27HF. Each bank of cylinders gets it's own waste gate. Of course the waste gate pipe has to be angled and sized correctly which is part of the issue with aftermarket headers.
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'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 02-26-2009, 11:41 AM
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Well, I went with the K27S and RARLYL8 muffler from Brian and his colleagues.

I am still on the first 100 mile break in, so no boost yet... I can say I really like the exhaust note and I love hearing the whine of the new turbo through the exhaust. The care sounds very very nice to my ears with the turbo sound in there.

I am now waiting for the wideband O2 feature for my UTCIS WUR and look forward to balancing AFR with that.

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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 05-08-2009, 12:07 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #89 (permalink)
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