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GO DAWG GO's Avatar
 
Join Date: Jan 2007
Location: Inland Empire of the left coast
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Brian,

I have done nothing to the boost controller. Is this adjustable? I installed the 1 bar spring only and did nothing else. By the way- The wastegate was non removable from my car because the 2 front attachment bolts have been removed and welded or pinned. I replaced the spring with the WG in the car using my buddy and 2 adjustable carpenter clamps....What a job.. Should I adjust something? Also Im going to check my intake manifold and boots for leaks...Do you use WD-40 to spray and check while the engine is running??

Thanks

Bob
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1 bad 930
Old 03-16-2007, 06:14 AM
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Crotchety Old Bastard
 
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I'm confused. Do you have an aftermarket boost controller on your engine?

1.0bar is 1.0bar. You should never see 0.8bar when a 1.0bar spring is being used. I use ether to check for vacuum leaks.
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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 03-16-2007, 08:50 AM
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You can use propane to check for leaks too.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 03-16-2007, 09:13 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #23 (permalink)
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Brian,

I have no reason to believe anyone has installed an aftermarket boost controller. My Boost pressure (indicated) peters out at .8 bar under boost. I purchased and installed a 1 bar spring from Performance Products before I knew about Pelican... My thoughts are that if I was leaking boost wouldnt I naturally have a vacuum leak also and cause an erratic idle????? Can positive pressure (Boost) escape and not affect negative pressure at idle?
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1 bad 930
Old 03-16-2007, 09:28 AM
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Crotchety Old Bastard
 
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A boost leak would likely also cause a vacuum leak.

Have you had a chance to pull your intercooler and check the O-rings?
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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 03-16-2007, 01:07 PM
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No only because I dont have any new ones in the event I find a bad. I did spray around the intake boots..The big one attached to the fuel pressure reg. has a small leak..the idle smooths out. But that is in line before the turbo so it cant be the perpetrator. I also pulled 3 plugs on the right side and they appeared to be tanish with some buildup probably from running rich. No oil (Good) I install 3 Denso U-groove W24ESR-U plugs and the car run better. Is this plug OK. I would have bought the W3DPO if I could but not available on a Saturday night...I will get the O rings and boots today. I will tell you what happens..

Thanks

Bob
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1 bad 930
Old 03-19-2007, 05:25 AM
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Crotchety Old Bastard
 
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I run the W3DPO plugs. No experience with anything else.

The intercooler O-rings are pretty resilient. I have often joked that my intercooler needs to be held on by velcro as often as I have had it off and on. I simply wipe on (the ring) a film of engine oil every time I remove the intercooler.
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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

Last edited by RarlyL8; 03-19-2007 at 08:55 AM..
Old 03-19-2007, 08:52 AM
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Power = RPM x torque

Stock 930 engines are cammed to achieve best torque trough middle range. Turbocharger is somewhat big as well and goes "online" after 3000 RPM. As such, torque will raise just north of 3000 RPM and then start falling further up the revs.

At 5500 RPM, torque will fall quicker than revs rize as cams run out of breath, and power curve will start going down again.
With other words, engine isn't "dead" after 5500 RPM but it's often not worth it revving much past that.

As optimal accelleration is achieved by highest sum of areas under power curve and 930 box is somewhat long-legged, one needs to slightly oveshoot 5500 RPM's when shifting. This in order to hit the "sweetspot" on next gear.

To truly enhance the 930 engine's ability to rev, one would need to swap the turbocharger to better/bigger one, change the cams to more radical profile and get rid of CIS.
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Old 03-20-2007, 12:41 AM
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Crotchety Old Bastard
 
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Goran - do you have a dyno graph of a 300HP stock Euro 930 that you can post? That would go a long way in illistrating what can be expected from a stock engine.
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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 03-20-2007, 06:53 PM
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fella's,

Where have you experienced boost leaks? Generally the IC O-rings? If I were to check for overpressure leakage where is a good place to start. I could see these areas leaking from positive pressure and not from negative pressure...Hard to determine where with carb cleaner or WD 40. Rule of thumb just replace them all..How can you pressure test?

anyway as I said the rubber boot upstream from my turbo (the big one connected to my CIS fuel pressure regulator assembly with the metering plate) has a slight vacuum leak. I didnt see them for sale anyware. Pelican has the newer ones? Got any ideas who sells them?

Bob
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1 bad 930
Old 03-22-2007, 05:18 AM
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It is known that the IC seals will let air in as well as out.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 03-23-2007, 10:13 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #31 (permalink)
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I have the same problem.
My 930 with K27, headers, larger half bay IC, new wastegate tested with both .8 and 1.0 Bar springs, new fuel pumps, injectors, new cam timing etc.
Still the power curve drops off after 3000 rpm in all gears. The new K27 7200 spools up quick around 2500 rpm and the wastegate dumps heavy but I feel like I have to shift around 3500 rpm because I don't feel much of a power pull at that point. This is just after a major disassembly of the engine to replace a single cylinder after it cracked less than 100 miles after my shop installed the aftermarket intercooler, K27 and headers.
I wonder if I over boosted because of that work.
Any ideas because I am arguing with my shop now because I won't accept the car running so poorly.
All ideas are welcomed.
Glenn
Long Island, New York
Old 07-15-2011, 03:59 PM
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Whoops - wrong thread

Last edited by E-man930; 07-15-2011 at 05:12 PM..
Old 07-15-2011, 04:16 PM
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Quote:
Originally Posted by NY930 View Post
I have the same problem.
My 930 with K27, headers, larger half bay IC, new wastegate tested with both .8 and 1.0 Bar springs, new fuel pumps, injectors, new cam timing etc.
Still the power curve drops off after 3000 rpm in all gears. The new K27 7200 spools up quick around 2500 rpm and the wastegate dumps heavy but I feel like I have to shift around 3500 rpm because I don't feel much of a power pull at that point. This is just after a major disassembly of the engine to replace a single cylinder after it cracked less than 100 miles after my shop installed the aftermarket intercooler, K27 and headers.
I wonder if I over boosted because of that work.
Any ideas because I am arguing with my shop now because I won't accept the car running so poorly.
All ideas are welcomed.
Glenn
Long Island, New York
I like a motor and am used to one that will pull until redline, call me spoiled however I like em that way, best to drive before tiy buy,
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Anthony @ Voitureltd Bayside WI.
Old 07-15-2011, 07:28 PM
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