84 930 TURBO - 5 Warm Up Regulators in 11 months!!!
09-15-2006, 09:01 PM
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84 930 TURBO - 5 Warm Up Regulators in 11 months!!!
I've been reviewing every WUR post I can find in this forum, and am looking for anyone that has had similar problems!!! I have a 1984 930 Turbo. I purchased this car almost one year ago, and since then have gone through 5 warm up regulators.
The car had undergone modification prior to my purchase. The original CAMS were removed and replaced with 959 CAMS, the car was ported, a larger turbo was installed, and Kokeln Intercooler installed. Based on these modifications, mechanics assume it's running at about 450HP.
The first time the regulator blew, we simply replaced the part with a Bosch WUR under the assumption that this would correct the problem.
A few months later, BAM, this WUR blew. At this time, we brought the car into a "Porsch Modification Specialist" (???), who replaced the WUR in his shop. He indicated that the pressures were good. He replaced the WUR at no charge because it was under warranty.
The WUR blew again, and we brought the car back to the same shop. He ran extensive tests on the engine and determined that the fuel pressures were "fluttering". He replaced the fuel accumulator, this did not fix the problem. He then replaced the fuel regulator, again it still fluttered. He finally thought it might be the fuel distributor. He sent the existing fuel distributor to be rebuilt. It came back, the the pressure still fluttered. He sent it out again for rebuild, SAME PROBLEM. Finally, he replaced it with an aluminum fuel distributor, a combination of new and rebuilt parts. The fluttering stopped. $3700 later, we go home with a rebuilt aluminum fuel distributor and yet another Bosch warm-up regulator (no charge - still under warranty).
About a month later, you guessed it, the WUR blew AGAIN. Now we've racked up $5000 in "repairs," towing, and parts - mostly labor, and the same problem exists.
The car is now in the shop, sitting. The mechanic has put in an older, used WUR because he is now questioning the strength of the Bosch regulators that he's been using in the car. He revs the car daily to see if the WUR will blow. He's offerred that we might take the car and drive it as normal, to see if it blows. He's thinking that it will not because we may have Bosch to blame for faulty WUR. He's had the car 11 days now - he says he revs it at least once a day, but since he's "working for free", he cannot devote as much time to it or drive it regularly. I asked him why, after all this money and an incorrect solution in the fuel distributor, are we still having this problem? Why did I spend so much money for an INCORRECT solution? He stated that the fuel distributor needed to be replaced anyway, and the fluttering did not "help" the problem. Well, neither did the new fuel distributor!!!
Of course replacing the CIS system entirely is an option - would converting to EFI solve the problem? I hate to do that after all this time, money, and agony. I don't know at what point I cut my losses, bring it somewhere else, and forget the thousands of dollars I've spent so far. I've also emailed Brian Leask to inquire about an adjustable WUR - This has never been suggested to me by the mechanic, he seems to assume that the stock WUR will work, and it is just other problems creating the blown WUR.
I am sorry that this is so long, I just wanted to give you all as much info as possible - If anyone has any additional suggestions or common experience, please let me know!
The car had undergone modification prior to my purchase. The original CAMS were removed and replaced with 959 CAMS, the car was ported, a larger turbo was installed, and Kokeln Intercooler installed. Based on these modifications, mechanics assume it's running at about 450HP.
The first time the regulator blew, we simply replaced the part with a Bosch WUR under the assumption that this would correct the problem.
A few months later, BAM, this WUR blew. At this time, we brought the car into a "Porsch Modification Specialist" (???), who replaced the WUR in his shop. He indicated that the pressures were good. He replaced the WUR at no charge because it was under warranty.
The WUR blew again, and we brought the car back to the same shop. He ran extensive tests on the engine and determined that the fuel pressures were "fluttering". He replaced the fuel accumulator, this did not fix the problem. He then replaced the fuel regulator, again it still fluttered. He finally thought it might be the fuel distributor. He sent the existing fuel distributor to be rebuilt. It came back, the the pressure still fluttered. He sent it out again for rebuild, SAME PROBLEM. Finally, he replaced it with an aluminum fuel distributor, a combination of new and rebuilt parts. The fluttering stopped. $3700 later, we go home with a rebuilt aluminum fuel distributor and yet another Bosch warm-up regulator (no charge - still under warranty).
About a month later, you guessed it, the WUR blew AGAIN. Now we've racked up $5000 in "repairs," towing, and parts - mostly labor, and the same problem exists.
The car is now in the shop, sitting. The mechanic has put in an older, used WUR because he is now questioning the strength of the Bosch regulators that he's been using in the car. He revs the car daily to see if the WUR will blow. He's offerred that we might take the car and drive it as normal, to see if it blows. He's thinking that it will not because we may have Bosch to blame for faulty WUR. He's had the car 11 days now - he says he revs it at least once a day, but since he's "working for free", he cannot devote as much time to it or drive it regularly. I asked him why, after all this money and an incorrect solution in the fuel distributor, are we still having this problem? Why did I spend so much money for an INCORRECT solution? He stated that the fuel distributor needed to be replaced anyway, and the fluttering did not "help" the problem. Well, neither did the new fuel distributor!!!
Of course replacing the CIS system entirely is an option - would converting to EFI solve the problem? I hate to do that after all this time, money, and agony. I don't know at what point I cut my losses, bring it somewhere else, and forget the thousands of dollars I've spent so far. I've also emailed Brian Leask to inquire about an adjustable WUR - This has never been suggested to me by the mechanic, he seems to assume that the stock WUR will work, and it is just other problems creating the blown WUR.
I am sorry that this is so long, I just wanted to give you all as much info as possible - If anyone has any additional suggestions or common experience, please let me know!
09-16-2006, 01:35 AM
#2
Addict
Rennlist Member
Rennlist Member
Blew? What do you mean "blew"?
The warm up regulator lowers your control pressure when the engine is cold to let the car run a little rich until it warms up. I don't know for sure, but I believe 930s also have a vacuum connection which enriches mixture under load.
What are your system and control pressures?
On edit:
This doesn't make sense. All WURs are Bosch, as CIS is a Bosch fuel injection system.
Fuel pressures were fluttering? Which pressure? Cold Control pressure, Warm control pressure or system pressure? When was it fluttering, when he revved it? If it is the control pressure, and it flutters lower under load, that may be what it is supposed to do, particularly if it has vacuum enrichment on the WUR.
Tom
The warm up regulator lowers your control pressure when the engine is cold to let the car run a little rich until it warms up. I don't know for sure, but I believe 930s also have a vacuum connection which enriches mixture under load.
What are your system and control pressures?
On edit:
Originally Posted by 930turbo
The mechanic has put in an older, used WUR because he is now questioning the strength of the Bosch regulators that he's been using in the car. He revs the car daily to see if the WUR will blow.
Fuel pressures were fluttering? Which pressure? Cold Control pressure, Warm control pressure or system pressure? When was it fluttering, when he revved it? If it is the control pressure, and it flutters lower under load, that may be what it is supposed to do, particularly if it has vacuum enrichment on the WUR.
Tom
Last edited by emcon5; 09-16-2006 at 01:59 AM.
09-18-2006, 08:26 PM
#3
Rennlist Member
959 cams? I don't think so, the 959 engine is a double overhead cam design, and its cams can't be used in a single overhead cam application. If 964 cams were used that's OK, and won't change anything. One thing that I'm curious about, what conversion work was done to federalize your car? When you say that the WUR "blew," what exactly was the symptom? Tom's comments make sense, and we need more info.
Pete
Pete
09-19-2006, 01:36 AM
#4
Three Wheelin'
C'mon Pete you haven't done the 959 head conversion before??? 
Seriously though, I am also wondering what a "blown" WUR is. We just had an '89 930 in where the diaphragm inside the WUR was leaking, and it was leaking gas. Is this what you mean 930turbo?
---
Chris Andropoulos
Schneider Autohaus
Santa Barbara, CA
Seriously though, I am also wondering what a "blown" WUR is. We just had an '89 930 in where the diaphragm inside the WUR was leaking, and it was leaking gas. Is this what you mean 930turbo?---
Chris Andropoulos
Schneider Autohaus
Santa Barbara, CA
