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Looking for help EFI ITB Tuning
Hi,
I have installed a Triumph ITB EFI setup on my 1977 911 S Targa with a stock 2.7. I purchased the kit used from a Pelican forum member. I am running a FuelOnly setup utilizing the stock distributor with SpeedDensity and a MAP signal. I have my vacuum manifold connected to 3 of the 6 ITBs, when i connected all 6, the MAP signal was too high and wouldn't work. I have my brake booster connected through the vacuum manifold. I have disconnected the vacuum for the distributor as I believe the vacuum retard is not working on the distibutor. Al Kosmal has been an immense help to get the kit running but I also wanted to check with the Pelican brain trust to see if I am missing anything. The car has problems with a cold-start but I'm not too worried about that now, I am more challenged with the idle. I have turned off all TPS adjustments and the car is running some WUE. At idle I am pulling around 45 kpa and about 13.5 AFR. My concern though is that the idle will start off around 1100 RPM and gradually increase as the car warms up. My fuel table looks odd to me as I have the used the VE Analyze and the Fuel is around 84 at idle.  
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Kevin 1977 911 S Targa |
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04-10-2025, 10:42 AM
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Slow old car
Join Date: Jan 2014
Location: SE PDX
Posts: 441
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I don’t know much about the Triumph setup, but have you verified that the ITBs are well balanced?
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Mike 1980 911 SC 3.1 Coupe // 1986 VW Vanagon Syncro EJ22 // 2015 Macan Turbo // 2017 i3 REX |
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04-10-2025, 10:48 AM
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Yes, I believe the ITBs are balanced. I did get them balanced at 3 kg/hr and that is low however if I balanced them higher than the idle is also higher.
It feels like there is something I am missing but I'm not sure what it is.
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Kevin 1977 911 S Targa |
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04-10-2025, 11:09 AM
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Jenvey is in the UK, suggest a remote desktop tuning session with them.
Are you near a Dyno?
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1980 911 - Metzger 3.6L 2016 Cayman S |
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04-10-2025, 01:04 PM
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There is a dyno about 40 minutes away that comes recommended, they charge about $1k for 3 hours of dyno tuning
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Kevin 1977 911 S Targa |
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04-10-2025, 01:14 PM
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Do you have the brake booster on a one way valve? My PMOs came with a valve. Not sure if not having one would give a poor vacuum reading or not.
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Rutager West 1977 911S Targa Chocolate Brown |
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04-10-2025, 02:01 PM
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I ended up checking the timing with a timing light and it was off, I adjusted it to 5 degrees ATDC for idle and that ended up dropping the idle and it now is running pretty good.
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Kevin 1977 911 S Targa |
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04-10-2025, 02:43 PM
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Join Date: Jun 2019
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You should be tuning using throttle as load for ITBs. Use MAP as a multiplier.
It is not possible to get ITBs to run correctly on MAP alone, and shouldn't be attempted. Anyone that says otherwise has no business tuning.
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North Idaho CDA / Spokane area Instagram: to.performance MoTeC USA Authorized Dealer Porsche 959 Department Manager at Canepa *retired after 10 years* Website / Webstore https://www.topperformancetuning.com/ |
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04-11-2025, 01:05 PM
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1977 Porsche 911S Targa
