New PB 1/4 CC503
11-12-2012, 10:22 AM
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New PB 1/4 CC503 Best run I've had so far. I think I can get a little faster if I had a couple more runs. Only got two runs the whole day. Car has everything in my sig with stock heads. Hoosier Drag Radials were 255/50-16 on stock salad shooters. The track I raced at was Maryland International Raceway. What do you guys think? Also I'm planning on putting a 150 wet shot of nitrous on it this winter, what do you guys think it'll run then?
R/T .131
60' 1.694
330 5.085
1/8 7.932
MPH 86.21
1000 10.393
1/4 12.430
MPH 112.87
R/T .131
60' 1.694
330 5.085
1/8 7.932
MPH 86.21
1000 10.393
1/4 12.430
MPH 112.87
11-12-2012, 11:06 AM
#4
Congrats on the new best 
Your mph says there's an 11.9 in it if you can get everything to work in synch.
The numbers you posted have me puzzled. The 60' looks decent, the 1/8th ET a little slow, the 1/8 mph very slow, and then it recovers strongly judging by the 1/4 mph. ???
Your mph says there's an 11.9 in it if you can get everything to work in synch.
The numbers you posted have me puzzled. The 60' looks decent, the 1/8th ET a little slow, the 1/8 mph very slow, and then it recovers strongly judging by the 1/4 mph. ???
11-12-2012, 11:24 AM
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I wonder if it has to do with my transmission shiftinng. I noticed on the two runs I did that the 4l60e I have seemed to take a little bit of time to shift to the next gear. I've always asssumed they take a little while to shift normally, or should they shift into gear instantly? Also on the other run I did I ran a 12.5 and I hit the rev limiter for a split second and then shifted into gear. I wonder if this is a tunning problem? The trans I have is a built 4l60e with all the bells and whistles to make hold 500hp+.
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11-12-2012, 12:02 PM
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Well it's definitly not shifiting instantly like it should be then. I have it set to be shifiting at shifting at 6300 rpm. Is there any test I can do to check to see if its the trans or tune?
11-12-2012, 12:05 PM
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Do the 4l60e have a problem with shifting when they are cold? Only reason I ask is because I sat around for a few hours before my next run and when I finally got a chance to run my trans temepeture guage said it was cold and thats the run I hit the rev limiter for a split sec.
11-12-2012, 12:47 PM
#10
Yes, it can do that. I wouldn't go so far as to call it a "problem", but I've noticed on my first run of the day I'll occasionally tag the limiter right at the shift. On the second and subsequent runs when there's more heat in the tranny, it doesn't do it.
Also, a set point of 6300 in your program sounds on the high side for stock heads and CC503 cam, especially if that's the 1-2 shift. Depending on where your rev limit is set, you could easily be bumping it on either shift.
All tranny's are different depending on clutch clearances, valvebody mods, etc., but all have a lag from PCM shift command to actually completing the shift. Usually the 1-2 shift needs more "lead" than the 2-3 because the rpm's are climbing at a higher rate in 1st gear than they are in 2nd.
With my stock motor, I needed only a 200-300 rpm lead, but with the current motor and radical gearing, I need 600-700 rpm.
Also, a set point of 6300 in your program sounds on the high side for stock heads and CC503 cam, especially if that's the 1-2 shift. Depending on where your rev limit is set, you could easily be bumping it on either shift.
All tranny's are different depending on clutch clearances, valvebody mods, etc., but all have a lag from PCM shift command to actually completing the shift. Usually the 1-2 shift needs more "lead" than the 2-3 because the rpm's are climbing at a higher rate in 1st gear than they are in 2nd.
With my stock motor, I needed only a 200-300 rpm lead, but with the current motor and radical gearing, I need 600-700 rpm.
11-12-2012, 01:22 PM
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It was small transmissions company not a big name brand or anything like that. This is actually my third transmission and so far it's felt better than the previous two I had. lol But your right it could be my trans still. Is there any way I can test it?
I'll check my schedule and let you know if I can make it up there on Saturday. Thanks for the help!
I'll check my schedule and let you know if I can make it up there on Saturday. Thanks for the help!
11-12-2012, 01:29 PM
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Also when I raised the shift points I only did it by the rpm and not the mph. Could that be a reason why it's not shifting fast? I figured if the mph was already being met with the lower rpm then I could raise the rpm shift point and it’ll still be met. Or am I wrong with this?
11-12-2012, 01:46 PM
#15
Also when I raised the shift points I only did it by the rpm and not the mph. Could that be a reason why it's not shifting fast? I figured if the mph was already being met with the lower rpm then I could raise the rpm shift point and it’ll still be met. Or am I wrong with this?
None of that will affect the shift time, only the shift rpm.
Where is your rpm limit set?
11-12-2012, 02:13 PM
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Ok good i'm glad I left it alone then. I could never find a straight answer to that question. I'm pretty sure the rev limiter is set at 6900.
11-12-2012, 08:14 PM
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I'm a t56 man myself, but I seem to remember there being something needed in the tune for our cars whenever a higher stall convertor is installed. Read the thread about Matt's PPM z28 with stock heads and a cc306 cam. I think it has something about "Dyno graph and track times" in the title. Several guys are talking about the issue in that thread.
