My Pony Express Tale
10-24-2008, 09:47 AM
#76
In Your Face, Ace
Rennlist Member
Rennlist Member
Thanks all for the supportive comments. The car was very stable at that speed, didn't feel floaty or
twitchy.
Andrew, I am running a 044, in fact, I had Dave ship out a new one on Friday because it was whining
and wasn't able to keep the fuel pressure up. The new one doesn't whine, but the fuel pressure is still
dropping... I was communicating with Mike S. about this, but still don't have it resolved.
As for a bigger image of the LogWorks screen, try:
http://928.jorj7.com/2008-pony/103/L...-4th-speed.jpg
I don't have a XD16 gauge, they're pretty expensive. So far I'm just logging on the LM-1 or laptop.
It might be something to consider after I get the car running well.
Bill,
Do you want to start at 11?
Thanks,
twitchy.
Andrew, I am running a 044, in fact, I had Dave ship out a new one on Friday because it was whining
and wasn't able to keep the fuel pressure up. The new one doesn't whine, but the fuel pressure is still
dropping... I was communicating with Mike S. about this, but still don't have it resolved.
As for a bigger image of the LogWorks screen, try:
http://928.jorj7.com/2008-pony/103/L...-4th-speed.jpg
I don't have a XD16 gauge, they're pretty expensive. So far I'm just logging on the LM-1 or laptop.
It might be something to consider after I get the car running well.
Bill,
Do you want to start at 11?
Thanks,
10-24-2008, 12:54 PM
#77
Addict
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Rennlist Member
Thread Starter
Abby,
I'm using the stock in-tank fuel pump to get the fuel out of the fuel cell into the fuel sump
that feeds the main fuel pump (044). I have been looking for a replacement for this
in-tank fuel pump. I figure I need one that can flow as fast as the 044, but don't know
if I need one that is rated at as high pressure. I know that Bosch has a in-tank pump
(0 580 254 040) that has the same flow rate, but I think I the high fuel pressure could
be a problem in my set up.
Anyone out there know the flow rate of the stock in-tank fuel pump? Or have suggestions
for an in-tank pump?
I'm using the stock in-tank fuel pump to get the fuel out of the fuel cell into the fuel sump
that feeds the main fuel pump (044). I have been looking for a replacement for this
in-tank fuel pump. I figure I need one that can flow as fast as the 044, but don't know
if I need one that is rated at as high pressure. I know that Bosch has a in-tank pump
(0 580 254 040) that has the same flow rate, but I think I the high fuel pressure could
be a problem in my set up.
Anyone out there know the flow rate of the stock in-tank fuel pump? Or have suggestions
for an in-tank pump?
10-24-2008, 01:44 PM
#78
Rennlist Member
Hi George, I didn't see this thread before - Bill mentioned this incident at SFest. I'm glad to see that our logging mods worked, sad to hear about the AF boot & oil issue. 
It's unfortunate that you don't seem to have excess cooling capacity -- sucking intake air through the radiator is not helping, and while a higher capacity IC would mitigate it, it would be better to have ambient air entering the SC. If you had excess cooling capacity I would suggest pinching off the core tubes in front of the inlet. Maybe C&R could be persuaded to make up one of their higher-capacity 928 radiators, with core tubes in front of the intake omitted? You might end up with cooling capacity similar to stock...
It's unfortunate that you don't seem to have excess cooling capacity -- sucking intake air through the radiator is not helping, and while a higher capacity IC would mitigate it, it would be better to have ambient air entering the SC. If you had excess cooling capacity I would suggest pinching off the core tubes in front of the inlet. Maybe C&R could be persuaded to make up one of their higher-capacity 928 radiators, with core tubes in front of the intake omitted? You might end up with cooling capacity similar to stock...
10-25-2008, 01:20 AM
#81
Addict
Rennlist Member
Rennlist Member
Thread Starter
Bill,
Here's a screen shot of a 3rd gear tuning run:
notice the fuel pressure drops as the rpm goes up, even though the boost is going up
which should cause the fuel pressure to raise...
Here's a screen shot of a 3rd gear tuning run:
notice the fuel pressure drops as the rpm goes up, even though the boost is going up
which should cause the fuel pressure to raise...
10-25-2008, 10:18 AM
#82
Rennlist Member
Hey George... Very impressive.
I would love to come out there some year and just run in the newbie class. It looks like a lot of fun.
Here is a post link to what I am using for my intercooler and pump. The intercooler is large, the size of the AC condensor and the pump that I am using is a Deadenbear which pumps about 25 gallons per minute with only a 3 amp draw. The pump is billet and has no rubber impeller. I think it's as bullet proof of a pump as you can find. It's primarily used on big block Chevrolets for drag racing, where they remove the belt driven water pump.
https://rennlist.com/forums/showpost...postcount=1757
I ran this setup at all of the road courses where I instructed this year for Porsche Club and it worked very well. I don't run at the extended lengths that you do (only about 40 minutes max), but I am running 10PSI on this and with the combination of lots of full throttle runs and lower speed corners, I probably have less cooling air to work with than you would.
The net result of this system was that my Intercooler water temp was never more than about 8-9 degrees above ambient.
I'm still using the windshield washer bottle as an initial reservoir and I'm using windshield washer fluid with a bottle of Water Wetter.
I didn't see any pictures of what you are using for an intercooler...but if you are interested in this unit drop me a note, the intercooler was less that $150 if I recall.
I also reworked my oil breather system and have no more issues with it on track. There are a couple of posts covering this and a new oil fill and a fresh air inlet for the engine in the posts below from the Twinscrew thread. I have about 10 full track days on this setup now, with NO issues.
https://rennlist.com/forums/showpost...postcount=1753
https://rennlist.com/forums/showpost...postcount=1754
https://rennlist.com/forums/showpost...postcount=1755
I also added a knock sensor to my 1985 Model Year car and then added the J & S Safeguard.
This unit will see knock and retard the timing before the cylinder that knocked can fire again.
This unit would be very worthwhile for any of you running boost as a failsafe in the event of a cylinder going lean or a cylinder predisposed to detonation. Louie Ott was the first one to use this system on his monster. And again....I've used it for the entire year on track with NO other tuning beyond getting to a good A/F Mixture.
https://rennlist.com/forums/showpost...postcount=1756
Good luck.
Ken
I would love to come out there some year and just run in the newbie class. It looks like a lot of fun.
Here is a post link to what I am using for my intercooler and pump. The intercooler is large, the size of the AC condensor and the pump that I am using is a Deadenbear which pumps about 25 gallons per minute with only a 3 amp draw. The pump is billet and has no rubber impeller. I think it's as bullet proof of a pump as you can find. It's primarily used on big block Chevrolets for drag racing, where they remove the belt driven water pump.
https://rennlist.com/forums/showpost...postcount=1757
I ran this setup at all of the road courses where I instructed this year for Porsche Club and it worked very well. I don't run at the extended lengths that you do (only about 40 minutes max), but I am running 10PSI on this and with the combination of lots of full throttle runs and lower speed corners, I probably have less cooling air to work with than you would.
The net result of this system was that my Intercooler water temp was never more than about 8-9 degrees above ambient.
I'm still using the windshield washer bottle as an initial reservoir and I'm using windshield washer fluid with a bottle of Water Wetter.
I didn't see any pictures of what you are using for an intercooler...but if you are interested in this unit drop me a note, the intercooler was less that $150 if I recall.
I also reworked my oil breather system and have no more issues with it on track. There are a couple of posts covering this and a new oil fill and a fresh air inlet for the engine in the posts below from the Twinscrew thread. I have about 10 full track days on this setup now, with NO issues.
https://rennlist.com/forums/showpost...postcount=1753
https://rennlist.com/forums/showpost...postcount=1754
https://rennlist.com/forums/showpost...postcount=1755
I also added a knock sensor to my 1985 Model Year car and then added the J & S Safeguard.
This unit will see knock and retard the timing before the cylinder that knocked can fire again.
This unit would be very worthwhile for any of you running boost as a failsafe in the event of a cylinder going lean or a cylinder predisposed to detonation. Louie Ott was the first one to use this system on his monster. And again....I've used it for the entire year on track with NO other tuning beyond getting to a good A/F Mixture.
https://rennlist.com/forums/showpost...postcount=1756
Good luck.
Ken
Last edited by Vlocity; 10-25-2008 at 10:40 AM.
