I installed a STS kit on my Z and it came with the Turbo XS Utec that has preset maps from STS.

after the install, i have surging and the utec is reflecting knock in heavy load boost above 5000 rpms despite running rich (10:1). I figured it just needed a detailed dyno tune and figured it would fix the problem.

After 4 hours of making multiple pulls and changes by the tuner, the problem continues. The tuner says he has never seen anything like this and has to do some research.

We double checked the grounds on the ECU/UTEC but thats not it.

If anyone has any suggestions, please help.......

 

new tuner maybe one more experienced with the vq and the utec. do a once more over the install, check for loose wires and connections.

 

Sounds like you need a new tuner. GL.

 

+1 new tuner...If you live by west palm beach try to check out japtrix, they tuned my car recently using Utec XS turbo.

 

I checked over the install 2 times the day i put it in, as well went over it again the day we fired up the car, and yesterday did it again and re-did the ground wire with the problem continueing.

The tuner is an established shop and came highly recommended.
I highly doubt it was the tuner, not saying its an impossibility but i would be surprised if that was case here...... Plus this problem is occuring with the base maps that came with the kit. He saved the maps and settings to send them off to have them evaluated.

I going to trying calling the companies today to see is they have any suggestions.

I appreciate everyones help

 

10:1 will cause huge problems right there. fix your AFR to mid-high 11s and report back.

 

Agreed. To much fuel can also cause knock.

you have surging as in idle surge? or like a stumble during acceleration?

 

I changed to the lean map and it takes it to a 11.5:1 to 12:1 but still get knock at the same place. the surge is at idle but isnt horrible, better when A/C on, neither is unbareable. The car stalls after driving and shifting to neutral, rpm drop to the point it kills the engine.

I pulled the plugs tonight and the tips are white.

The shop wanted me to check O-rings on injectors, and they seem fine....

 

http://www.flickr.com/photos/54842977@N05/5082349845/

 

Plugs look like you're running lean

 

Plugs say lean, gauge says rich....

The dyno shop's a/f they put on the exhaust read exactly the same as mine.....

 

pull timing in that area and see if it goes away.

are you using copy thru timing for vacuum areas?

 

I know the tuner pulled timing on the dyno, and it didnt help.

i personally have no experience tuning a car and have had the utec in the car for a week. I dont feel comfortable making any adjustments to the maps at this point cause ill probably make the situation worse.

I dont know if this will help:

TIME RPM MAP MAF TPS MLP Knock IGN#1 INJ#1 IGN FUEL BOOST
dig dig dig deg duty deg % (CL)

00593267 4198 111 168 87 00 00 +37.3 13.4 ECU. +0.0 ECU.
00593467 4230 111 162 87 00 00 +37.3 12.8 ECU. +0.0 ECU.
00593667 4246 115 175 101 00 00 +35.2 14.2 ECU. +0.0 ECU.
00593867 4257 127 180 104 00 00 +35.3 17.2 ECU. +0.0 ECU.
00594067 4219 129 181 103 00 00 +33.2 18.1 ECU. +0.0 ECU.
00594267 4257 130 179 104 00 00 +34.3 16.9 ECU. +0.0 ECU.
00594467 4301 133 183 110 00 00 +28.1 18.5 ECU. +0.0 ECU.
00594667 4323 137 191 115 00 00 +26.2 21.1 ECU. +0.0 ECU.
00594867 4323 142 189 120 00 00 +26.2 20.2 ECU. +0.0 ECU.
00595067 4397 146 198 122 00 00 +24.2 21.9 ECU. +0.0 ECU.
00595267 4391 151 204 127 00 00 +21.7 26.0 ECU. +0.0 ECU.
00595467 4444 155 207 130 00 00 +21.1 24.6 ECU. +0.0 ECU.
00595667 4504 159 212 134 00 00 +22.1 26.2 ECU. +0.0 ECU.
00595867 4522 163 208 134 10 00 +20.1 37.5 +16.0 +0.0 ECU.
00596067 4591 167 216 134 10 00 +19.1 40.5 +16.0 +0.0 ECU.
00596267 4578 172 220 136 20 00 +19.3 43.5 +16.0 +0.0 ECU.
00596467 4642 176 220 139 20 00 +19.2 46.8 +15.3 +0.0 ECU.
00596667 4701 183 223 138 30 00 +20.2 48.9 +14.0 +0.0 ECU.
00596867 4741 189 231 136 30 00 +18.1 51.9 +12.5 +0.0 ECU.
00597067 4823 194 239 136 30 00 +17.9 54.3 +11.2 +0.0 ECU.
00597267 4796 196 240 132 40 00 +17.0 56.2 +10.5 +0.0 ECU.
00597467 4916 196 236 126 40 00 +16.1 56.6 +11.1 +0.0 ECU.
00597667 4930 200 242 124 40 00 +17.9 58.4 +10.0 +0.0 ECU.
00597867 4938 204 241 128 40 00 +18.0 59.6 +9.1 +0.0 ECU.
00598067 5042 214 249 141 50 00 +16.9 62.3 +8.9 +0.0 ECU.
00598267 5144 224 255 145 60 00 +16.0 68.7 +10.0 +0.0 ECU.
00598467 5120 226 255 144 60 00 +15.0 70.8 +10.0 +0.0 ECU.
00598667 5224 226 255 145 60 00 +15.0 70.5 +10.0 +0.0 ECU.
00598867 5265 226 255 146 60 00 +16.1 70.2 +10.0 +0.0 ECU.
00599067 5291 224 255 146 60 00 +16.0 72.1 +10.0 +0.0 ECU.
00599267 5376 224 255 145 60 00 +17.2 72.1 +9.7 +0.0 ECU.
00599467 5446 226 255 145 60 00 +17.2 72.6 +10.0 +0.0 ECU.
00599667 5491 225 253 146 60 00 +17.9 73.6 +10.0 +0.0 ECU.
00599867 5437 225 255 147 60 01 +17.8 73.8 +1.5 +0.0 ECU.
00600067 5509 226 255 148 60 00 +17.8 74.6 +1.4 +0.0 ECU.
00600267 5621 228 255 148 60 00 +19.2 78.7 +8.6 +0.0 ECU.
00600468 5668 225 255 120 60 00 +18.9 75.3 +8.7 +0.0 ECU.
00600667 5482 156 193 40 10 00 +32.2 44.5 +27.5 +0.0 ECU.
00600867 5192 85 128 42 10 00 +33.2 41.7 ECU. +0.0 ECU.
00601067 4894 69 124 40 10 01 +34.4 39.1 ECU. +0.0 ECU.
00601267 4688 64 113 42 00 00 +32.3 5.5 ECU. +0.0 ECU.
00601467 4462 62 100 42 00 00 +30.3 5.3 ECU. +0.0 ECU.
00601667 4306 61 97 42 00 00 +26.3 5.1 ECU. +0.0 ECU.
00601867 4187 62 80 40 00 00 +23.3 5.0 ECU. +0.0 ECU.
00602067 4156 62 88 42 00 00 +20.2 1.6 ECU. +0.0 ECU.
00602267 4110 61 85 42 00 00 -1.8 1.6 ECU. +0.0 ECU.
00602467 4045 62 88 42 00 00 -1.8 1.5 ECU. +0.0 ECU.



What do you recommend for gap on the plugs? Kit says .26 or .27, the tuner says .15 to .18....

 

your car should run 100% with the stock 0.042" gap.


If timing and AFR didnt change anything, are you sure its real knock? The settings on the UTEC are quite conservative....

Throw a few gallons of race gas in there. If that clears up the problem, then we can go from there.

If not, then its not real knock.

 

I got an appointment for 9am tomorrow morning at Zfever in tampa....

Hopefully this will be my solution.......