1005 rwhp 03 C5...
12-22-2007, 05:37 PM
#82
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I have been told on my car back pressure could cause this. I would think an 81 housing per side on your car would be fine though. The next thing would be to measure your back pressure so you need to get some kind of reading from the exhaust manifold side I beleive.
Kane
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12-22-2007, 05:59 PM
#83
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Positive your wideband is accurate?
Did you throw a pressure tester on the valve springs just to confirm their pressure?
12-22-2007, 06:46 PM
#84
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no better... yeah WB is good....i have it on a narrow range on my chart display, so it looks jagged.....
no test v springs....i spoke with brian tooley.....said my spring should be ok...
test some mitshubishi coils on monday so.......
12-22-2007, 09:32 PM
#88
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I hope it's bad coils for a quick fix.
Good luck.
12-22-2007, 10:02 PM
#89
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Shouldn't have to change a thing. Only way to tell if the correct valves/setup/etc is on the heads is a pressure tester...anything could have happened on the install....wrong height, defective springs......too easy not to rule out with a tester. Hopefully the pushrod length is correct also.
I hope it's bad coils for a quick fix.
Good luck.
I hope it's bad coils for a quick fix.
Good luck.
i received an email from another C5 owner that reload his coils too and when the psi was cranked to 15 he too had issue @ 5600. putt'em back to stock and issue resolved. now that isnt to say that that was the issue but.....
ill pop off the v. covers and take a lookie. what procedure do u use to test?
thanks!
12-22-2007, 10:35 PM
#91
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not sure on the other details but I believe he mentioned twin walbros in the tank... they aren't going to go any further then 1000rw, you need to find a way to add the third or go to a real pump as they say 
12-22-2007, 11:00 PM
#92
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persicion 95 and a third pump, external. 10 psi activated hobb switch.
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12-23-2007, 01:59 AM
#96
My twin turbo alcohol motor was dropping out about 5000 rpm. Switched ignition sytems, wires and all of the usual things, to no avail. Spark was not able to jump the gap when boost came up. This is a very high compression motor with boost. Smaller plug gap fixed the issue. I have run into this on a couple of other 1000 RWHP combinations with High boost and or high compression/Nitrous where the smaller gap eliminated the problem.
12-23-2007, 08:35 AM
#97
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ITS COOL!
My twin turbo alcohol motor was dropping out about 5000 rpm. Switched ignition sytems, wires and all of the usual things, to no avail. Spark was not able to jump the gap when boost came up. This is a very high compression motor with boost. Smaller plug gap fixed the issue. I have run into this on a couple of other 1000 RWHP combinations with High boost and or high compression/Nitrous where the smaller gap eliminated the problem.
