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Location: Danville - CA
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Fuel Head Help

Long shot I know but do any of the EFI guys have a stock 930 fuel head sitting on a shelf I could borrow for some dyno testing? Happy to provide some sort of deposit on it if you have concerns over getting it back.

Been trying to get my motor finished and it seems that my builder and my CIS specialist are in disagreement over why the motor is running lean. Not going to name any names but both shops are very well regarded. My head has been rebuilt and modified to flow extra fuel but the builder is still seeing the motor lean out on the dyno. Before buying another fuel head and starting from square one (at the suggestion of the builder) I wanted to test a stock unit to prove out whether the issue is the fuel head or something else.

Last edited by 930LDR; 06-02-2014 at 10:59 PM..
Old 05-30-2014, 05:13 PM
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I can't speak for Brian (RarlyL8), but you might try contacting him and see if he is willing to loan one to you.
Old 05-30-2014, 05:38 PM
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sounds like a ridiculous situation...
good luck with it.
Old 05-30-2014, 08:14 PM
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When I bought my 86 it had been modified to a Euro Fuel Head. It had some issues so we sent it out to a shop in Ca., I do not have the name handy, and had it rebuilt twice. It came back and never ran right again. I ended up finding a stock U.S. head for an 86 and it ran perfect.

Apparently rebuilding the fuel head is an art as much as science.


Ie..... probably not your tuner.
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Mark

1986 930 Ultra-Smith RUF Slant Nose conversion, RUF VB, K-27 HF-S, B&B Headers and Exhaust, RUF Short Shifter, RUF Interior
Old 05-31-2014, 04:45 AM
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Send it to Home - CIS Flowtech
Old 05-31-2014, 07:06 AM
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Heck it you decide to buy...I will sell you my whole cis system with the euro fuel head, bigger fuel lines,wur,throttle body,manifold, blocks and injectors(everything pictured) for $1450.00 plus shipping. Worked flawlessly when it was in my car. I went efi.




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Rey....86 930 "the Mistress"
Old 05-31-2014, 07:38 AM
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I have rebuilt fuel heads sitting on the shelf but I don't think that is the issue.
Is it a -037 or -145? The stock US head will support ~375whp, Euro ~400whp.
What was done to the WUR? If you are running lean on boost the WUR is where the adjustment needs to be made. Once that adjustment is maxed out you can increase flow at the fuel head.
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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; 05-31-2014 at 07:52 AM..
Old 05-31-2014, 07:49 AM
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You have not given any basic checks, like control pressure, system pressure...Why are the shops fighting over the fuel head? Have they balanced checked the fuel volume from the injectors? The way Larry at Flow Tech described to me, it's like trying to balance a plate of six marbles, getting those six springs just right. Done it before and it is tedious, for sure. Most likely the WUR, as mentioned here.
Old 05-31-2014, 11:03 AM
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BTW guys... to be fair both shops are going out of their way to help me out and get this resolved... don't want anyone to read into the original post... just trying to rule out any possibilities.
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Rob Montgomery
'88 Blk/Blk 930 ('Lucy') - Not Stock & Not Running

Last edited by 930LDR; 06-03-2014 at 07:23 AM..
Old 06-02-2014, 10:56 PM
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Rob, is this car your black high HP monster? If so the fuel head would have the flow set for the engine output and the WUR would be set to match the head. The specs of both would not be stock and should not be altered. A stock head would not work with the modified specs of the WUR, the engine would run lean. Baseline parameters for the head/WUR combo depend on stock spec fuel delivery. Check this first and verify the pumps are returning 1500ml/30 sec. Once verified confirm the system pressure and WCP are at the new specs. Last would be to check that the fuel pressure on boost is at new spec using an air compresser.
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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 06-03-2014, 04:52 AM
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Hey Brian - It is my black 930. Not sure if it ever qualified as a HP monster but she did have the standard 930 bolt-on mods. I actually have a stock head and WUR on its way (on loan - thanks again Todd). The builder can pop both of those on and see whether or not he still thinks the issue is somewhere between the two modified units. Pump flow was supposed to be re-checked yesterday. Dumb question - what is WCP?

To answer your previous question the WUR had been set up to match the modified fuel head. Some of those specs may have been since re-adjusted and are being re-set one more time.
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Rob Montgomery
'88 Blk/Blk 930 ('Lucy') - Not Stock & Not Running
Old 06-03-2014, 07:22 AM
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Warm control pressure.
I doubt if a stock -145 head will flow enough fuel, a -037 might.
Old 06-03-2014, 08:20 AM
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