Z does not accelerate

juld0zer · 10-16-2014, 03:09 PM

Digi, that feeling of more accessible power if you rev out 1st is probably purely due to engine momentum.
there is a programmed throttle restriction, which yes can be tuned out.
im generally a pretty laid back cruiser too but getting off the line i generally go up to 3k max.

Mike, i think yours is probably just heatsoak related. but that's just a quick conclusion. The lag we are experiencing results in a several second delay in throttle response before the engine roars to life. what mods do you have?

mike12002us · 10-16-2014, 04:21 PM

I have the Stillen G3 intakes, CNT Res TP, Injen CBE, Stillen LW pulleys, Uprev tune, Z1 Plenum, Stillen grounding kit, Rods, Wiseco Pistons. The last 2 dont add any power and ive had for 60k miles. I have a stillen 25 row oil cooler to keep the engine cool and I have a Seibon BD hood to release all the heat. I can see the heat escape from the engine when I am stopped. Ive done everything to keep heat away. I had no problems with the first time I had my car tuned but when I went and got the Z1 plenum and retuned I started with the issues. I went back and got another dyno tune because the car had these issues. This helped for a while but then 3 weeks ago the car started acting up again. It might be a tune issue but Im not sure why the car would drive fine for 2 months before acting up again.

3 things that come to mind of whats going on...

1. Low compression, if so that sucks...I need to test
2. When the Plenum was done something was not done right with the Throttle Bodies or not put on tightly IE hoses.
3. The tune is too aggressive and it pulls the timing.

Well thats what is in my mind at least.

mike12002us · 10-16-2014, 04:26 PM

Tonight I am going to clean the MAF, throttle bodies, put on my other K&N Filters for the G3's, check wiring, reinstall the tune/unbolt battery, make sure all hoses are tight. I have the Z1 silicone hoses for my car and maybe I didnt tighten something??? I will let everyone know if I find anything. Im going to change the oil tomorrow as well in case it makes any difference ( i know it wont)

juld0zer · 10-16-2014, 05:26 PM

do you have an Uprev cable to datalog?
i think you're on the right track there. Did you disconnect the throttle bodies from the loom or bump the butterfly at any point? they are incredibly sensitive and i think there must be some sort of keep alive memory in them. They must be sapping a little power when everything's switched off to keep that memory alive. Otherwise i see no other reason why they seem to make the engine run weird after reconnecting WITHOUT performing the 3 relearns i mentioned above.

Did you do the 3 relearns after you fitted the plenum? (gas pedal and throttle rest position, and idle air relearn). the first two must be done on a bone cold engine (coolant temp below 25 deg celsius). the idle relearn has to be done after a decent drive, as long as coolant temp goes over 85*c i think should suffice.

Otherwise i'd suggest cleaning the throttle bodies and the butterfly valves, check condition of the seal between plastic plenum and metal manifold undernearh, and the seals betweem the throttle bodies and the plenum itseld. Do the 3 relearns after all is reassembled. You must use a stopwatch for the idle relearn because it's very sensitive to timing

mike12002us · 10-17-2014, 03:22 PM

Small update...I only had time to clean the MAF's last night. After using half a bottle of cleaner on them I cranked the car up and it immediately felt better. I have been driving around all day ant its running perfect. I will say that I am not counting my "chickens" yet as the weather is low humidity and 72 today. I will have to see what happens over the weekend. Fingers crossed at least. I'm still going to do all of the other things to make sure though.

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10-16-2014, 03:09 PM	#1 (permalink)
juld0zer Enthusiast Member Join Date: Nov 2012 Location: Sydney Posts: 428 Drives: 11 Nissan 370Z MB M6 Rep Power: 139	Digi, that feeling of more accessible power if you rev out 1st is probably purely due to engine momentum. there is a programmed throttle restriction, which yes can be tuned out. im generally a pretty laid back cruiser too but getting off the line i generally go up to 3k max. Mike, i think yours is probably just heatsoak related. but that's just a quick conclusion. The lag we are experiencing results in a several second delay in throttle response before the engine roars to life. what mods do you have?

10-16-2014, 04:21 PM	#2 (permalink)
mike12002us Base Member Join Date: Nov 2012 Location: Charleston, SC Age: 41 Posts: 189 Drives: 2010 Sport 370z 6mt Rep Power: 13	I have the Stillen G3 intakes, CNT Res TP, Injen CBE, Stillen LW pulleys, Uprev tune, Z1 Plenum, Stillen grounding kit, Rods, Wiseco Pistons. The last 2 dont add any power and ive had for 60k miles. I have a stillen 25 row oil cooler to keep the engine cool and I have a Seibon BD hood to release all the heat. I can see the heat escape from the engine when I am stopped. Ive done everything to keep heat away. I had no problems with the first time I had my car tuned but when I went and got the Z1 plenum and retuned I started with the issues. I went back and got another dyno tune because the car had these issues. This helped for a while but then 3 weeks ago the car started acting up again. It might be a tune issue but Im not sure why the car would drive fine for 2 months before acting up again. 3 things that come to mind of whats going on... 1. Low compression, if so that sucks...I need to test 2. When the Plenum was done something was not done right with the Throttle Bodies or not put on tightly IE hoses. 3. The tune is too aggressive and it pulls the timing. Well thats what is in my mind at least.

10-16-2014, 04:26 PM	#3 (permalink)
mike12002us Base Member Join Date: Nov 2012 Location: Charleston, SC Age: 41 Posts: 189 Drives: 2010 Sport 370z 6mt Rep Power: 13	Tonight I am going to clean the MAF, throttle bodies, put on my other K&N Filters for the G3's, check wiring, reinstall the tune/unbolt battery, make sure all hoses are tight. I have the Z1 silicone hoses for my car and maybe I didnt tighten something??? I will let everyone know if I find anything. Im going to change the oil tomorrow as well in case it makes any difference ( i know it wont)

10-16-2014, 05:26 PM	#4 (permalink)
juld0zer Enthusiast Member Join Date: Nov 2012 Location: Sydney Posts: 428 Drives: 11 Nissan 370Z MB M6 Rep Power: 139	do you have an Uprev cable to datalog? i think you're on the right track there. Did you disconnect the throttle bodies from the loom or bump the butterfly at any point? they are incredibly sensitive and i think there must be some sort of keep alive memory in them. They must be sapping a little power when everything's switched off to keep that memory alive. Otherwise i see no other reason why they seem to make the engine run weird after reconnecting WITHOUT performing the 3 relearns i mentioned above. Did you do the 3 relearns after you fitted the plenum? (gas pedal and throttle rest position, and idle air relearn). the first two must be done on a bone cold engine (coolant temp below 25 deg celsius). the idle relearn has to be done after a decent drive, as long as coolant temp goes over 85*c i think should suffice. Otherwise i'd suggest cleaning the throttle bodies and the butterfly valves, check condition of the seal between plastic plenum and metal manifold undernearh, and the seals betweem the throttle bodies and the plenum itseld. Do the 3 relearns after all is reassembled. You must use a stopwatch for the idle relearn because it's very sensitive to timing

10-17-2014, 03:22 PM	#5 (permalink)
mike12002us Base Member Join Date: Nov 2012 Location: Charleston, SC Age: 41 Posts: 189 Drives: 2010 Sport 370z 6mt Rep Power: 13	Small update...I only had time to clean the MAF's last night. After using half a bottle of cleaner on them I cranked the car up and it immediately felt better. I have been driving around all day ant its running perfect. I will say that I am not counting my "chickens" yet as the weather is low humidity and 72 today. I will have to see what happens over the weekend. Fingers crossed at least. I'm still going to do all of the other things to make sure though.