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If you have not messed around with C/R then it’ll be 9.5:1. Safe for 10psi (intercooled).
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Here is an old chart I had in my file. Porsche built their early turbos with 6.5:1 on CIS. Many have pushed that successfully to 8.5:1 with efi.
9.5:1 at 10psi shows 16:1 Effective Compression Ratio. Good luck! ![]()
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Steve 1981 SC Steel Widebody Outlaw in Pacific Blue and Artic White, 930/51 to 3.2l, K27 7006 Turbo, P&P Twin Plug heads, Twinfire Ignition, BLwur, Ruf Intercooler, Powerhaus headers, Zork, CIS Euro FD, 009 injectors, DOD, DP Lid, 044 pump, 930 4 sp LSD, Mocal 44 w/fan, LM2, Brembo, Retroair, Euromeisters. |
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Meaning ? 10psi not so safe as mentioned ..
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Steve 1981 SC Steel Widebody Outlaw in Pacific Blue and Artic White, 930/51 to 3.2l, K27 7006 Turbo, P&P Twin Plug heads, Twinfire Ignition, BLwur, Ruf Intercooler, Powerhaus headers, Zork, CIS Euro FD, 009 injectors, DOD, DP Lid, 044 pump, 930 4 sp LSD, Mocal 44 w/fan, LM2, Brembo, Retroair, Euromeisters. |
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Turbonut
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It is safe when considering things like turbine housing (which affects MAP/EBP ratio which itself is directly related to sensitivity to knock), how one tunes ignition table etc. If you are using factory Motronic with its advance table then you can be quite sure you get knock.
Have fuel and ignition under control and enjoy. Turbocharging is not for experimenting, better to know what to do but it is very rewarding.
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'83 924 (2.6 16v Turbo, 530hp),'67 911 hot-rod /2.4S, '78 924 Carrera GT project (2.0 turbo 340 hp), '84 928 S 4.7 Euro (VEMS PnP, 332 HP), '90 944 S2 Cabriolet http://www.facebook.com/vemsporsche |
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New boost gauge, where the (Broken) clock was 😉
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Brando
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Jazzy
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Turbo powa! 1977 911s. it's cool |
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What did your project run you in parts? I have been looking into the Promotive Stage 1 kit.
Great job on your project. Foster
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Foster Monroe, Ga 1984 911 Carrera Targa |
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Join Date: Jul 2013
Location: Brisbane, Australia.
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Always learning. www.aircooledporsches.com.au See me bumble my way through my first EFI and TURBO conversion! https://youtu.be/bpPWLH1hhgo?si=GufVhpk_80N4K4RP |
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New Wheels coming up
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Dieter9,
Good job adding a turbo along with VEMS and those are nice looking wheels! Are you still maintaining contact with Peep? If yes, can you find out if all is well with him? It seems he dropped off the planet since he has not responded to my emails for over a month. I ordered and paid for a full optioned VEMS kit including complete harness (not a PNP) from Peep 3 months ago. So, I'm kind of worried what happened to him.
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MikeD '87 930 |
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Quote:
Regarding Peep.. @raceboy ..no i have had not been able to get a answer from him either. Me too asked him of he's ok .. but no answer . Did he send your Vems kit? |
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No I have not received it yet. A month ago Peep said he was half way done with the harness and that was the last I heard from him. Please let me know once you hear back from him and I'll do the same here.
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MikeD '87 930 |
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I got an email from Peep. All is well with Peep...he got really busy with life over the past month. He said he hopes to ship my kit within 2 weeks (not completed now).
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MikeD '87 930 |
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went to test bench today !
![]() 331 hp and 413 nm torque .. + Guy was impressed with peep his config! He did it all from home, i just send him some logs to check evertthing . He adjusted accordingly .. |
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