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Alan L's Avatar
 
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You have bags of room.
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:-)
Old 05-02-2018, 11:33 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #61 (permalink)
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Ok just realized the Mityvac isn't helping set dump pressure. I used my air compressor set at 13 psi and I see the pressure setting is around 2 bar. Gonna raise it a couple points and see what happens. Maybe 2.5 bar?
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Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, custom Evergreen K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & hooligan pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 05-02-2018, 03:49 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #62 (permalink)
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Progress. Your dump pressure needs to come up to around 3.2 bar - if your WP is around 3.7.
You previously measured it at 3.0 bar?
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:-)
Old 05-02-2018, 04:38 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #63 (permalink)
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Success!

So my enrichment pressure was set at 2 bar so I raised it to 3.4 with Warm Pressure at 3.8. Took it for a good rip and the AFRs were so much better! At idle thru WOT. At WOT they were as low as 11.5. Nice satisfying pull thru mid range and top end!

I realized the other day when I thought I was checking my enrichment pressures using the mityvac, I was using it wrong and not getting proper readings. The air compressor worked perfectly tonight. I'm so happy! The last couple days have been so stressful with a track event coming up this weekend. I was so nervous I'd screw something up and be screwed out of my track weekend! I'm celebrating with a Lagavulin and not touching a thing more til after the weekend.

I'm curious to try 3.2 enrichment pressure but maybe next week.

Cheers
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Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, custom Evergreen K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & hooligan pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 05-02-2018, 05:03 PM
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Nice! Way to stick with it. It’s pretty cool that Alan can help you with this from half way around the world.
Gotta love the inter webs.
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81 Pacific Blue 930 Euro coupe slicktop on a strict diet, Rarlyl8 headers, Blowzilla turbo, Tial waste gate, Full bay I/C, Home made center out exhaust, Leask WUR, MSD 6AL, PLX wideband
Wevo shifter, LSD. Next up, Cams, Heads and port work
Old 05-02-2018, 05:14 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #65 (permalink)
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Yes it is cool and I really appreciate Alan's help along with others who've chimed in.

Now do I leave it be or try to improve upon it some more...
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Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, custom Evergreen K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & hooligan pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 05-02-2018, 05:49 PM
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You are close. Butt, your car will love you more if you can tweek a bit more out of it.
The best improvement you can do tho is get a Leask sw (a few hundred $s). This will even that dump out even further.
Hard to know exactly where to tweek it now - you are close. But if you can get that 11.5 into 12s , all the better. Your dump pressure is now 3.4, 0.4 below WP. About where it should be. You could tweek it up to 3.5, but that is about as far as you would normally go. Each car/engine is a bit different tho. It is really a matter of getting the AFRs in the right range - by whatever adjustment works. Going to 3.2 dump pressure will push your AFrs lower - wrong way.
Maybe track it for the weekend and see how it settles down. But if you want to tweek it further after that, you would be pushing the WP and or the dump pressure UP by another 0.1 or 0.2. Maybe raise WP by 0.1 and dump by 0.2.
Glad you finally can see the improvement. Now treat yourself to a Leask switch. You deserve it now for perseverance.
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:-)
Old 05-02-2018, 07:41 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #67 (permalink)
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I find my track AFRs go a bit leaner than beating down the road. Put it down to heat of battle.
So you have a comfortable safe margin to play with, without having to worry about having to adjust anything at the track. Drive like you stole it and after the w/end you will have a sense of where you need to go with it. you are in the ball park.
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:-)
Old 05-02-2018, 07:57 PM
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Thanks Again Alan, I can't find much info on the Leask RPM switch, i'd like some details about how it's installed before I consider it. If i'm spending another few hundred maybe I should get a FrankenCIS and a Megasquirt, and sell my WUR. Sounds like a project for next winter tho...
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Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, custom Evergreen K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & hooligan pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 05-03-2018, 03:34 AM
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A small solenoid switch that plumbs in to the vac/boost line between the TB and WUR. Then wires run to a MSD rpm unit. This has a power and earth lead, 2 wires to the switch and one to the tach wire.
I can take a pic in a few days.nVery simple and effective. The switch mounts below the FD, the MSD box by your CDI.
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:-)
Old 05-03-2018, 10:11 AM
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So one more thing, if I want to correct a slightly rich spot mid range should I drop my Warm Pressure from 3.8 to 3.7, leave my enrichment pressure at 3.4?

I'm going to see who it goes at the track tomorrow and will attempt a tweek Sat night if needed.
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Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, custom Evergreen K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & hooligan pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 05-04-2018, 03:56 AM
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Quote:
Originally Posted by Alan L View Post
You have bags of room.
Alan
Here is mine. Canít seem to get an Allen key into it. Does mine look stock or modified? Iíve noticed my car is not as easy to start anymore. It used to fire with the flick of the key, now I have to crank it and apply some gas pedal. Maybe a idle mixture adjustment would help?
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Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, custom Evergreen K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & hooligan pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 05-04-2018, 04:11 AM
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If you changed the cold control pressure it may now be too lean to start properly. The cold pressure is a spec setting, set it to the low end of spec then adjust the idle mixture back where the engine runs best.

.
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Old 05-04-2018, 05:41 AM
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HI Brian, I didn't change my cold pressure, it was sitting at 1.4 when I first checked it, and I haven't touched it. Should I bump it up to 1.8 and see if it helps cold starting?

Also I plan to check residual pressure, so if I understand correctly i'll just turn my fuel pumps off after setting my CP and let it sit for about 1/2 hr, periodically checking pressure and noting the amount it drops?
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Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, custom Evergreen K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & hooligan pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 05-04-2018, 05:57 AM
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So the track was fun today! Car pulled great, better than the old turbo. Has much better pull thru mid range and top end. But I think I need to tweet a little more which I'll do next week.
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Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, custom Evergreen K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & hooligan pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 05-05-2018, 03:43 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #75 (permalink)
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You prob need to remove the air filter to free the idle mix screw. It is probably jamming and not fully down. Your cold press is at low end of spec (rich end). No need to adjust. Idle mix is too lean.
The only way to tune out mid range fuel dump is Leask sw.
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:-)
Old 05-07-2018, 01:15 AM
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Hey Alan, I see in the picture your fuel head is silver, I assume stock, where mine is the euro black version which flows more, would that give mine the ability to be tuned richer than yours?
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Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, custom Evergreen K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & hooligan pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 05-07-2018, 03:21 AM
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It is the version aluminum which has more flow and not the black. For some more of flow by staying with this system is to replace injectors by those of turbo3.6.
Old 05-07-2018, 05:00 AM
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And mine is modded to 007 to flow more.
But you are not running out of fuel. You have plenty - according to your AFrs. It is all in the WUR tuning. But you cannot eliminate that mid range dump without Leask switch. It is a design limitation of the CIS system.
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:-)
Old 05-07-2018, 11:32 AM
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Thanks Alan, i'm just wrestling with thoughts about, why spend another $300+ on something I may remove in a few months if I do Franken CIS digital WUR. I think the car runs pretty good as is. But in mean time i'll tweek the pressure a touch more and see if I can get an improvement. Going hard thru the gears from a stop seems great, but from a roll it seems to bog or hesitate a little.
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Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, custom Evergreen K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & hooligan pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 05-07-2018, 01:09 PM
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