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Registered User
Join Date: Apr 2006
Location: New Zealand
Posts: 3,311
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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:-) |
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,289
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Put that part number into a google search and you'll find a whole bunch of them with a wild variety of prices.
Or go wander around in a you pull it salvage yard looking for old CIS Mercedes and see if you can find one there. |
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Registered User
Join Date: Apr 2006
Location: New Zealand
Posts: 3,311
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Steve,
If you think it may be useful, I could post it to you for a trial. I suspect it will not solve the pulsing issue though. I don't think the response time of the diaphragm will be able to keep up with the pulses. It was designed to smooth out stepwise CP changes - over a response time of a second or so, not milliseconds. 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:-) |
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umop apisdn
Join Date: Jun 2014
Location: Brisbane, Australia
Posts: 507
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Thanks Gentlemen,
The unit mentioned also appears to have been used on either side of the Frequency Valve in Benz CIS-Lambda installations which are running at the same frequency as our little monster. If my math is right this early in the morning then we are dealing with a 0.0026cc pulse volume at a low-ish frequency of 100hz so on a 1 square cm diaphragm .015mm of movement +- resting point would be all we need to absorb the pulses. Alan, thanks for the assist! I'll try the smaller units we have here first and will call on your offer if it looks like a larger damper is needed. copied from the other thread mentioned Quote:
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Steve 1981 928S 4.7 ROW with KE3-Jetronic and Franken8 (AEM Inifinty) "Be the man your dog thinks you are." Yes! mechanical/hydraulic constant flow injection can be managed by a modern EMS www.FrankenCIS.com Last edited by Reanimotion; 09-14-2014 at 04:12 AM.. |
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Registered User
Join Date: Apr 2006
Location: New Zealand
Posts: 3,311
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it p...s me off that UTCIS have my unit (and my money). One or the other would be OK, but both??
I never tried the diaphragm when we were trying to solve the oscillation problem, because UTCIS were keen to solve the issue - rather than patch it up. Which is why my unit ended up going back to them. Since then I haven't been able to get any response. 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:-) |
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umop apisdn
Join Date: Jun 2014
Location: Brisbane, Australia
Posts: 507
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Yes, disappointing behaviour for any business, but sadly common.
If the damper works, I'll send you one of our prototype blocks ![]()
__________________
Steve 1981 928S 4.7 ROW with KE3-Jetronic and Franken8 (AEM Inifinty) "Be the man your dog thinks you are." Yes! mechanical/hydraulic constant flow injection can be managed by a modern EMS www.FrankenCIS.com |
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umop apisdn
Join Date: Jun 2014
Location: Brisbane, Australia
Posts: 507
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oh, as a status update.
We have others helping with or interested in prototype validation 1. Supercharged Mercedes V8 racer and kit manufacturer here in AU 2. 4cyl turbo application in Germany I'm off to grab some dampers now ![]()
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Steve 1981 928S 4.7 ROW with KE3-Jetronic and Franken8 (AEM Inifinty) "Be the man your dog thinks you are." Yes! mechanical/hydraulic constant flow injection can be managed by a modern EMS www.FrankenCIS.com |
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Registered User
Join Date: Apr 2006
Location: New Zealand
Posts: 3,311
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Steve,
Thanks for the offer. If you are looking for places to try it out - I'm happy to try it on my track 930. Being in NZ may make it a bit more convenient if you don't find something useful nearby. 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:-) |
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umop apisdn
Join Date: Jun 2014
Location: Brisbane, Australia
Posts: 507
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A busman's holiday!
I could live with that ![]()
__________________
Steve 1981 928S 4.7 ROW with KE3-Jetronic and Franken8 (AEM Inifinty) "Be the man your dog thinks you are." Yes! mechanical/hydraulic constant flow injection can be managed by a modern EMS www.FrankenCIS.com |
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umop apisdn
Join Date: Jun 2014
Location: Brisbane, Australia
Posts: 507
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Should be testing the revised systems tomorrow
![]() a. EFI damper b. super secret sneaky alternative
__________________
Steve 1981 928S 4.7 ROW with KE3-Jetronic and Franken8 (AEM Inifinty) "Be the man your dog thinks you are." Yes! mechanical/hydraulic constant flow injection can be managed by a modern EMS www.FrankenCIS.com |
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Registered User
Join Date: Apr 2006
Location: New Zealand
Posts: 3,311
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This all pie in sky theory, but I suspect a spring loaded damper will not work. I just throw this out there, in case it proves right and lots of time is not wasted trying to make something work, where I suspect the principal is flawed. Especially since you have a super secret sneaky option.
For the spring damper to work, it would have to be able to oscillate at the same or better rate as the pulse frequency (and I suspect that is a big ask for a mechanical spring on a damper/diaphragm). What will happen if the oscillations are not exactly in phase with the pulse/CP swings is you will get one phase of oscillation superimposed on the other. At some points they will cancel (smooth out) and at other parts they will add to the amplitude, making the spikes worse. That is my $0.02c guess at it, and I am happy to be wrong. 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:-) |
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Forced Induction Junkie
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Quote:
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Dave '85 930 Factory Special Wishes Flachbau Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P |
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umop apisdn
Join Date: Jun 2014
Location: Brisbane, Australia
Posts: 507
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I must admit I was sceptical too Alan, but the spirit of this silly project began as test and eliminate, so test we did
![]() Now just to make sure of the baseline from last weekend ran existing setup again and got our ripples ![]() added this little fellow ![]() so we now have FD -> Sensor -> damper -> wur -> return to tank and received this nice and happy result ![]() Ok so for the moment the 6 prototype blocks require some massive reworking to integrate a damper, but if you are happy to re-plumb and use something like the bosch unit Alan has in the thread earlier and you can get the pressure sensor upstream then the block is fine or just a bosch frequency valve would do nicely. Gents - because this is FrankenCIS, I think we have to quote the 1931 movie Henry Frankenstein: Look! It's moving. It's alive. It's alive... It's alive, it's moving, it's alive, it's alive, it's alive, it's alive, IT'S ALIVE! ............. Doctor Waldman: You have created a monster, and it will destroy you!
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Steve 1981 928S 4.7 ROW with KE3-Jetronic and Franken8 (AEM Inifinty) "Be the man your dog thinks you are." Yes! mechanical/hydraulic constant flow injection can be managed by a modern EMS www.FrankenCIS.com |
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umop apisdn
Join Date: Jun 2014
Location: Brisbane, Australia
Posts: 507
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prototype modified to show routing
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__________________
Steve 1981 928S 4.7 ROW with KE3-Jetronic and Franken8 (AEM Inifinty) "Be the man your dog thinks you are." Yes! mechanical/hydraulic constant flow injection can be managed by a modern EMS www.FrankenCIS.com |
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umop apisdn
Join Date: Jun 2014
Location: Brisbane, Australia
Posts: 507
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I'm about to start on the revised drawings for prototype v2 as I'm not comfortable driving around with a mess like the above under the bonnet for further testing.
Are we all happy to keep the production unit within the same footprint as the factory WUR? keeping in mind our thingy is not required for a DIY parts bin build if you are feeling creative.
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Steve 1981 928S 4.7 ROW with KE3-Jetronic and Franken8 (AEM Inifinty) "Be the man your dog thinks you are." Yes! mechanical/hydraulic constant flow injection can be managed by a modern EMS www.FrankenCIS.com |
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Registered User
Join Date: Apr 2006
Location: New Zealand
Posts: 3,311
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That looks very hopeful. What are the intermediate squiggles in your last graph, and presumably the bottom trace is the CP?
Maybe I should have tried my damper with the UT unit - but they were keen to solve the issue in other ways. My money says keep the WUR footprint if possible. Personally I don't care how ugly it is if it works better than the UT one. Good luck. 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:-) |
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umop apisdn
Join Date: Jun 2014
Location: Brisbane, Australia
Posts: 507
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Sqiggles are throttle presses
cleaned up a bit and rescaled for clarity top white - RPM red - Manifold Air Pressure bottom white - injector duty cycle red - target control pressure (flat line through green) green - actual control pressure ![]()
__________________
Steve 1981 928S 4.7 ROW with KE3-Jetronic and Franken8 (AEM Inifinty) "Be the man your dog thinks you are." Yes! mechanical/hydraulic constant flow injection can be managed by a modern EMS www.FrankenCIS.com |
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umop apisdn
Join Date: Jun 2014
Location: Brisbane, Australia
Posts: 507
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I've currently got it set to quite aggressively counteract the control pressure spikes in the system, this can be tuned down to allow a natural change from the air plate but still allow targeting from the maps
__________________
Steve 1981 928S 4.7 ROW with KE3-Jetronic and Franken8 (AEM Inifinty) "Be the man your dog thinks you are." Yes! mechanical/hydraulic constant flow injection can be managed by a modern EMS www.FrankenCIS.com |
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Registered User
Join Date: Apr 2006
Location: New Zealand
Posts: 3,311
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OK, I may have it a bit wrong here, but why is the CP changing with the throttle blips?
I'm guessing the airplate movement translated thru the fuel head piston is causing a temporary shift in CP? If you hold the throttle open (partially) presumably it will stabilize back to the original CP. 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:-) |
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Registered User
Join Date: Apr 2006
Location: New Zealand
Posts: 3,311
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What scale is the CP changing by (in terms of bar/psi) on the throttle blips?
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:-) |
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