Monday, October 22. 2007Belt tensioner tool
I talked with my brother who is a master mechanic in Ireland and he was saying the serpentine belts need to be a lot tighter than we had thought. Internet myth states that you can turn the belt through 90 degrees with your hand and it's tight enough which he says is bull shit. They need to be tighter than that. So, it's time to buy a tool. I bought this one:
http://www.otctools.com/products/detail.php?id=1762 from http://www.etoolcart.com. Hopefully, this buying experience will be a good one. I ordered it today and I'm waiting for a shipment notice. Once the tool arrives then we can start checking tension etc and see where we get. Saturday, October 13. 2007Alternator belt blows apart again, aarrggghhhh
Happened again today at Road America, 3 track days after replacing it. Second session out, aarghhh, one day I'll get to drive this car. No wiring damage today fortunately. I think I've figured this out now so hopefully this is the last time.
The problem is that cars pre 85.5 use a 5 rib alternator belt, 85.5 and later use a 6 rib belt. My car has a crank with 5 ribs and an alternator with 6. The 5 rib belt skips on the alternator during cornering and blows apart shortly there after. So, I need a 5 rib alternator pulley and then I reckon I'm going to be fine. Learned more about serpentine belts today. There are two naming schemes, one that looks metric and another one. The metric one is like 5PK0700 and the other is 280K5. Both are the same thing. Tuesday, October 2. 2007Cars look to be working again
I just did a DE weekend at Brained and the car worked very well. We did 3 25 minute sessions on Saturday and an hour long one on sunday and everything worked. Fuel guage works and fans/cooling system worked fine.
The high speed fan issue turned out to be the red/white wire in the front wire harness was grounded somewhere. This wire connects to the radiator fan switch and the AC dry switch. It seems to be shorted behind the repairs I did up towards the fuse box. It's some kind of wire touching the chassis issue but we couldn't find it. In the end I bend over the spade on the fan relay to disable the high speed fans and this worked. The car now just has a working low speed fan but this is working well enough for now. The high speed fan is still necessary though as it helps a lower pressure area behind the radiator and lets more air flow in as a result. Thats next. Wednesday, September 12. 2007Fans won't turn off
So,
Now that I figured I was over all this, but the fans never turn off now. Just turning the key without starting it turns on the fans. I checked the fan relay again and that aint it and I can't find any shorts so it looks like the fan switch is busted. I'm not sure how to test the fan switch but I ordered one today for 11 bucks so worst case, I have a spare. I'm compare it electrically with the current one to see if it's ok. Saturday, September 8. 2007Replaced Porsche 944 fuel sender today
I replaced the fuel sender with the replacement one today and the whole job took around 20 minutes. I took photographs which can be seen here. The gauge works fine now and finally I can tell how much fuel I have in the tank. The replacement fuel sender cost 44 bucks for a used one. A new one seems to be around 170 bucks. I like this 944 as the parts are cheap and I can work on it myself which saves on labor. Next up today is an oil change with new filter too.
Saturday, September 1. 2007Fuel guage not working solved
Tim delivered the car with the fuel guage not working. He's tried to debug it but got no where. I figured it out this morning. It's the fuel tank sensor. It was pretty easy to figure out. There is a black square cube connector on top of the fuel tank and you unplug that. Two of the wires connect to a potentiometer in the tank which reads between 65 ohms and 3ohms. 3 is full. I did a quick check and the gas guage went to full when I put a 2.5ohm resistor across wires 1 and 3 in the connector. Now, I gotta replace the fuel tank parts.
Saturday, August 25. 2007
Overheating problem solved finally Posted by Billy Newport
in Service at
18:45
Comments (0) Trackbacks (0) Overheating problem solved finally
The problem looks to have been air in the coolant system. I double checked all the wiring today from the relay box to the wires and everything checked out. Still overheated. The fans would come on at around 3/4 on the temp and would lower it briefly before it started rising again towards red.
Next, I tried bleeding the coolant system and there must have been a minute and a half of steam come out. I then turned it off and put in 3/4 of a gallon of distilled and then repeated this 3 or 4 times until just water was coming out. The car now runs in the garage perfectly at 1/4 on the temp guage. So, overall, the car took another 1.5 gallons of water which means there was a massive air bubble in it. I bought more 15W50 to change the oil tomorrow and put a new filter on it, figure the engine has had enough heat in it now to warrant a change. I made a new addition to what I keep handy at the track and it's a 5 gallon tank of distilled water. Wednesday, August 22. 2007Sad news
John Engle was killed at Mid Ohio in his BMW M3 when it spun on oil into another stationery car that had spun two laps earlier. He hit the other car in the rear with his driver side door at high speed, some say 100mph. The cage apparently failed and it took an hour to cut him out. The other car driver has bruising and a torn muscle. It makes me revisit the safety side yet again. I'm going to improve my cage over the winter as a result.
Saturday, August 18. 2007Belts on but car is overheating
I put the belts on and they are tensioned and working well. The car overheated after 20 minutes of running in the garage and pushed out .5 gallons of water through the overflow. I waited for it to cool down.
I added distilled water to top up the coolant tank. The fans didn't come on so it's something to do with the cooling relays or fans. I tried my relay (the big one) in another car and its fans all worked fine. I then went back to my car and checked the fuses for the fans, #10 and #15. Both were blown. This must have happened when the wires were pulled in to the alternator and shorted out so I replaced them with another pair of 25A fuses. I turned the car on and same thing. No fans, car heats up. Next is to check the fans actually work and the wiring and thermistor. More later. Wednesday, August 8. 2007New belts arrived
The alternator belt and steering belts came yesterday from Paragon so I'll try put them on now and hopefully thats the car back to normal. I saw some wire tubing in Radio Shack yesterday that was good to 275F with a 3/4 inch diameter so that looks a good candidate to cover the repaired harness in the car. 275F should be good enough for the temps on that side, especially with the air flow coming in.
Thursday, August 2. 2007Wiring harness repaired
Fixed the car tonight then. The front wiring harness has more than just the fan and lights etc. The coil wire is there also and this was cut along with 6 other wires total. No coil wire, no spark, won't start. I spliced them all back together with the appropriate wire gauge and it starts right up. I zip tied the harness to the unibody so this won't happen again, I'm suspecting the harness wasn't zip tied out of the way before although there is an old tie on the unibody but it's broken so it could be broken because of old age or other reasons and it looks like this let the harness move in to the path of the alternator blades and that pulled it in to the belt and zappo. Hard to know whether the belt pulled the harness or vice versa though so it doesn't matter now one way or the other.
I just need to buy the alternator belt, fit it and it looks better than before. I wrapped the harness in electrical tape but I'm looking for something better, i.e. waterproof and more weather/wear/heat resistant to put over it. Next track day is BIR with Donnybrooke again Sept 15th and then with PCA for 3 days at Sept 28th. Thursday, August 2. 2007Car won't start
Looks like the wiring harness also has the coil wire running in it and this is why the car won't start at all. I just need to find time to put the car on jack stands and start repairing the wire harness. Probably two hours of work but would you believe I have no time to do it the whole month of August. It sucks.
Monday, July 30. 2007
Billy at BIR, the good, the bad and ... Posted by Billy Newport
at
20:50
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Today was a nice day at BIR. The weather ended up in the 93s by the afternoon. The car was running well in the first two sessions. I got caught behind the spec cars in the second session pretty bad who were doing 3 minute laps so that was a pain and I couldn't get rid of them by heading in to the hot pit because all the cars are lined up there so it takes long enough to get through there that when you come out again the spec cars have lapped around again, duh
That all ended on the third session. My third lap out, the car pulled left in a major way in T10. I was thinking I don't believe it, another puncture in the same corner as June. Then I moved slowly in to the pit entrance and lifted my foot off the throttle and then the engine died. They towed me in to the pit area and then I popped the hood. The alternator belt had snapped and took off the power steering belt with it. The belt as it came apart grabbed the wire harness going to the radiator fans etc and pulled it in to the alternator which pretty much shredded it and cut maybe 5/6 of the wires. The local NAPA had the power steering belt but didn't have the 5PF 736mm belt for the alternator so I was shot. Lessons learned, protect that wiring harness from getting damaged like this again and have spare belts for next time. So, I thought day was over at lunch time. I phoned Tim the car builder and he was amazed the belt broke because it was new. But, what can you do. Learn for next time. Here is a link to some photos of the belt/wire harness carnage. Gary Curtis then very nicely let me do a session in one of his spec racer cars and I'm grateful for that as the spec racer made my day. It was a 4 speed Renault engined one and it was a lot of fun. The car is very easy to drive, has lots of grip and feels very stable. I was initially worried about it but after a lap about 3/4 cars behind the instructor then they were holding me up. It's not easy to pass in these things. I ended up taking about two laps to get 8/9 right so I could overtake 2 cars in to T10. They raced me in to ten which was a pain though. Next, I took the next couple of cars down the main straight and drafted to get some speed to pass late in the straight. I was in front now so I started to play with the car and I never saw the other spec cars again pretty quickly. The car was confidence inspiring, it's easy to be braver in it than I am in the 944 spec. I ended up going flat through 1 and 2 in it and flat through 5 and 8/9 which is about as brave as I've gotten in Brainerd but the car was just so easy to drive. Heel and toeing was a piece of cake in it. The car had the red line marked on the tach at 5400rpm but I hit at least 6k through T1 and felt the car could use another gear. I wish I could have gone out again in the 944 because I learned a lot driving the spec racer and it did build my confidence. A weird sensation is the wind. There's a lot of wind at 130mph hitting your helmet and body. The helmet felt like it was getting sucked up at points also. Visor down is obviously a must, little stones etc from the car in front easily can hit you. The brakes are also odd, the pedal is very, very firm. There is little brake feel and you need to press really hard on it to get it to stop quickly. The amount of pedal travel for brakes seemed really small but again, you get used to it and it's not a problem. I wore my R3 in the car and had no trouble with it at all. Once you're moving then you forget about it. So, overall, a good day. Gary and the BIR performance school put on a great event. The food was included at lunchtime along with drinks and they are genuinely nice guys. The instructors are pretty impressive. There is Gary, of course, the 2001 ALMS GTS champion. Herm Johnson was there who raced indy in the early 80s and finished 4th in the Indy 500. He was national champion in all the feeder formula series he entered on his way to Indy so the man can drive. He stopped racing Indy after crashing at 212mph but still races professionally. Chris Lake Smith was there who had raced in the UK and instructed at Brands Hatch. All very nice and obviously qualified. I did the Gary presentation in the morning and most of it was materiel I'd seen before but he gave pointers on various turns which turned out to be useful when I got faster in the spec racer he loaned me in the afternoon. The repairs to the car look cheap, new belts 30 bucks and fix the wiring harness which is a pain but easy enough. 4 sessions today, not what I wanted but I was happy at the end of the day. Definitely heading back to Gary in mid September. Sunday, July 29. 2007
First attempt to attach the G2X tach ... Posted by Billy Newport
at
20:15
Comments (0) Trackbacks (0) First attempt to attach the G2X tach signal behind the dash
I'm told removing the dash module so I could attach the tach signal from my data logger is a snap. There are 5 screws holding in he fascia in front of the dash module. 3 on the top and two over in the center air grille. Removing those made taking it out easy although chute on the lower edge of the right side made things tricky for a while.
The dash module itself is just screwed in with 4 screws and there are easy to remove. Now the problems start. My removable steering wheel adapter prevents me taking the dash module out. There isn't enough room on the bottom to slide out the dash module and that was that today. I had to pack to leave for the track so I didn't want to remove the adapter. I may try using the magnetic pickup tach signal tomorrow if I get a chance but the priority is laps. Sunday, July 29. 2007
Ready for DonnyBrookes racing day at ... Posted by Billy Newport
at
20:09
Comments (0) Trackbacks (0) Ready for DonnyBrookes racing day at Brainerd International
I drove up from Rochester today and everything looks set. It's going to be hot tomorrow, 93F high but I'd prefer heat to rain especially at Brainerd. The drag strip has VST on it to help with traction for NHRA drag cars but when it's damp/wet it's slippier than ice. Hopefully, the new track next year will fix this issue with the new configuration.
Besides keeping the car and myself in one piece, I just want to do 2/3 sessions tomorrow morning to get warmed up and see where I am and then get an instructor as much as possible in the afternoon to work on improving my driving which shouldn't be hard The car was easy to get ready. It isn't burning oil so after letting it warm up for a while the oil level looks good, it's about an 1/8 of an inch over max which I'm told is where it should be. Tires looked good, brakes same. This thing is cheap to run. After the Purple 996 debacle I'm starting to enjoy DE with a reliable car. |
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