Gen 1/2/3 valve springs nitrous - Kawasaki
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post #1 of 1 Old 07-12-2019, 09:02 AM Thread Starter
Join Date: Mar 2019
Posts: 11
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Gen 1/2/3 valve springs nitrous

I really need some help on valve spring choices with the nitrous. I have been spraying 82HP on stock springs. I know, crazy.. But.. I am doing it with a progressive controller, window TPS, speed enabled, window nitrous cut out before shift, direct port with 2 maps... DRY shot. I hear APE duals break, don't know why (installation error or other?). The weak link is the aluminum retainers with heavy springs. Some don't like Carpenter, some hate KW, not sure about APE. Gathered spring info:

The KW 40-40500 come with steel retainers and are a single spring, the same for both intake and exhaust.
The KW 40-40250 have Ti retainers, so the pressure is less. Not a fan of this one as the stock Kawi is more with lighter spring retainers.
APE is the same, basically as the KW 40-40500 but with less seat pressure.

Any experience with springs and NOS?

stock kawi 262lbs/"
1.32 35
0.97 127
92 262.8571429
0.35 1

KW SPRINGS 40-40500 275lbs/"
1.32 65
0.895 182
117 275.2941176
0.425 1

KW SPRINGS 40-40450 intake DUAL Spring 251lbs/"
1.35 50
0.905 162
112 251.6853933
0.445 1

KW SPRINGS 40-40450 exhaust DUAL spring 244lbs/"
1.24 44
0.795 153
109 244.9438202
0.445 1

APE VS1000K 271lbs/"
1.32 45
0.97 140
95 271.4285714
0.35 1
rocksalt is offline  
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