Help Neeed: Car acting up on dyno (intake, ptb, xpipe, exhaust, stock tune)
03-17-2018, 05:40 PM
#1
Help Neeed: Car acting up on dyno (intake, ptb, xpipe, exhaust, stock tune)
Hello everyone!!! I知 so sad. 
Super sad. Took my 2016 Z06 with only 4K miles to the race shop here in Hawaii to get my Injen Technology intake installed and then throw on the dyno to see what kind of power putting down. Already had Katech ported throttle body, Borla X pipe and Magnaflow exhaust installed. Doing warranty friendly mods so stock tune. Always use 92 Shell gas and sometimes octane booster such as Torco/Lucas. Used Torco today so should have been running close to 100 octane. During the first pull they found something wrong. In the upper rpm痴 it stuttered and kept dipping like crazy. Something is definitely wrong. The pull was only like 520hp/575tq which is super low for even a stock C7Z. The shop thinks it may be the plugs so on 7 Apr I made another appointment with them to put new plugs in. Hopefully that fixes the issue. If not might have to go back to the BMS drop in filter. If it still is acting up then I may need to go back to stock so could bring it in for work under warranty , but hopefully doesn稚 come to that. What do you guys think it could be? I致e heard some folks here say that they ran these mods on stock tune with no issues? Others said it was too much and caused some lean conditions and need a tune. Should I just go back to the BMS drop in filter? Any help would be greatly appreciated. Thank you in advance!
Super sad. Took my 2016 Z06 with only 4K miles to the race shop here in Hawaii to get my Injen Technology intake installed and then throw on the dyno to see what kind of power putting down. Already had Katech ported throttle body, Borla X pipe and Magnaflow exhaust installed. Doing warranty friendly mods so stock tune. Always use 92 Shell gas and sometimes octane booster such as Torco/Lucas. Used Torco today so should have been running close to 100 octane. During the first pull they found something wrong. In the upper rpm痴 it stuttered and kept dipping like crazy. Something is definitely wrong. The pull was only like 520hp/575tq which is super low for even a stock C7Z. The shop thinks it may be the plugs so on 7 Apr I made another appointment with them to put new plugs in. Hopefully that fixes the issue. If not might have to go back to the BMS drop in filter. If it still is acting up then I may need to go back to stock so could bring it in for work under warranty , but hopefully doesn稚 come to that. What do you guys think it could be? I致e heard some folks here say that they ran these mods on stock tune with no issues? Others said it was too much and caused some lean conditions and need a tune. Should I just go back to the BMS drop in filter? Any help would be greatly appreciated. Thank you in advance!
03-17-2018, 08:43 PM
#2
Melting Slicks
Member Since: Oct 2010
Location: Fair Oaks, California
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2017 C7 of the Year Finalist
Hello everyone!!! I知 so sad. Super sad. Took my 2016 Z06 with only 4K miles to the race shop here in Hawaii to get my Injen Technology intake installed and then throw on the dyno to see what kind of power putting down. Already had Katech ported throttle body, Borla X pipe and Magnaflow exhaust installed. Doing warranty friendly mods so stock tune. Always use 92 Shell gas and sometimes octane booster such as Torco/Lucas. Used Torco today so should have been running close to 100 octane. During the first pull they found something wrong. In the upper rpm痴 it stuttered and kept dipping like crazy. Something is definitely wrong. The pull was only like 520hp/575tq which is super low for even a stock C7Z. The shop thinks it may be the plugs so on 7 Apr I made another appointment with them to put new plugs in. Hopefully that fixes the issue. If not might have to go back to the BMS drop in filter. If it still is acting up then I may need to go back to stock so could bring it in for work under warranty , but hopefully doesn稚 come to that. What do you guys think it could be? I致e heard some folks here say that they ran these mods on stock tune with no issues? Others said it was too much and caused some lean conditions and need a tune. Should I just go back to the BMS drop in filter? Any help would be greatly appreciated. Thank you in advance!
Super sad. Took my 2016 Z06 with only 4K miles to the race shop here in Hawaii to get my Injen Technology intake installed and then throw on the dyno to see what kind of power putting down. Already had Katech ported throttle body, Borla X pipe and Magnaflow exhaust installed. Doing warranty friendly mods so stock tune. Always use 92 Shell gas and sometimes octane booster such as Torco/Lucas. Used Torco today so should have been running close to 100 octane. During the first pull they found something wrong. In the upper rpm痴 it stuttered and kept dipping like crazy. Something is definitely wrong. The pull was only like 520hp/575tq which is super low for even a stock C7Z. The shop thinks it may be the plugs so on 7 Apr I made another appointment with them to put new plugs in. Hopefully that fixes the issue. If not might have to go back to the BMS drop in filter. If it still is acting up then I may need to go back to stock so could bring it in for work under warranty , but hopefully doesn稚 come to that. What do you guys think it could be? I致e heard some folks here say that they ran these mods on stock tune with no issues? Others said it was too much and caused some lean conditions and need a tune. Should I just go back to the BMS drop in filter? Any help would be greatly appreciated. Thank you in advance!
03-17-2018, 10:46 PM
#4
03-17-2018, 10:47 PM
#5
03-17-2018, 11:09 PM
#6
Take your ported TB off and put your stock one back on, re-test. I had literally exactly same issues with my car same mods took my ported TB off and issues went away, you need a tune when running those mods all togeather.
from 1k-6k rpm my car ran perfect once it hit over 6k it started backfiring and struggling to get to 6500 I壇 throw a CEL ever now and then also. A TB is like a 5 minutes job to see if it makes a difference going back to stock, I would definitely start with that and see what happens.
from 1k-6k rpm my car ran perfect once it hit over 6k it started backfiring and struggling to get to 6500 I壇 throw a CEL ever now and then also. A TB is like a 5 minutes job to see if it makes a difference going back to stock, I would definitely start with that and see what happens.
Last edited by Ltrain925; 03-17-2018 at 11:09 PM.
03-18-2018, 12:41 AM
#7
Interesting. Thank you!! So I could leave the intake, x pipe and exhaust but just take off the ported throttle body? Ok I値l let the shop know that also. If it wasn稚 the spark plugs like he thinks then my recommendation was to just throw the BMS drop in filter back in and see if it works. But if I could leave intake I壇 rather have that on and take off the ptb.
Take your ported TB off and put your stock one back on, re-test. I had literally exactly same issues with my car same mods took my ported TB off and issues went away, you need a tune when running those mods all togeather.
from 1k-6k rpm my car ran perfect once it hit over 6k it started backfiring and struggling to get to 6500 I壇 throw a CEL ever now and then also. A TB is like a 5 minutes job to see if it makes a difference going back to stock, I would definitely start with that and see what happens.
from 1k-6k rpm my car ran perfect once it hit over 6k it started backfiring and struggling to get to 6500 I壇 throw a CEL ever now and then also. A TB is like a 5 minutes job to see if it makes a difference going back to stock, I would definitely start with that and see what happens.
03-18-2018, 01:18 AM
#8
Safety Car
I don't think it's the plugs with only 4,000 miles, they are good plugs from the factory.
I would remove 'that' intake (that's when the problem started, right?) and go back to stock/BMS filter myself 'first' because the computer is calibrated for the OEM size tubing, air box, MAF sensor placement, etc. Then I would try switching the ported throttle body out. However you can try it anyway you like.
I would remove 'that' intake (that's when the problem started, right?) and go back to stock/BMS filter myself 'first' because the computer is calibrated for the OEM size tubing, air box, MAF sensor placement, etc. Then I would try switching the ported throttle body out. However you can try it anyway you like.
Last edited by C7/Z06 Man; 03-18-2018 at 01:31 AM.
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The Rock1 (03-20-2018)
03-18-2018, 02:02 AM
#9
Yeah I don稚 think it痴 the plugs either, but I guess never know. A guy on IG said he had to re gap his and they were fairly new. I honestly don稚 know when the problem started. I can稚 even tell there is a problem now. Crazy. Hope it痴 nothing serious
QUOTE=C7/Z06 Man;1596806177]I don't think it's the plugs with only 4,000 miles, they are good plugs from the factory.
I would remove 'that' intake (that's when the problem started, right?) and go back to stock/BMS filter myself 'first' because the computer is calibrated for the OEM size tubing, air box, MAF sensor placement, etc. Then I would try switching the ported throttle body out. However you can try it anyway you like.[/QUOTE]
QUOTE=C7/Z06 Man;1596806177]I don't think it's the plugs with only 4,000 miles, they are good plugs from the factory.
I would remove 'that' intake (that's when the problem started, right?) and go back to stock/BMS filter myself 'first' because the computer is calibrated for the OEM size tubing, air box, MAF sensor placement, etc. Then I would try switching the ported throttle body out. However you can try it anyway you like.
[/QUOTE]
03-18-2018, 02:29 AM
#10
Safety Car
If you can't tell if you have a problem now the computer may have made some adjustments for that intake. If I remember correctly GM builds in a 25% +/- AFR adjustment capability. That way the cars run fine year round in Alaska or Arizona.
03-18-2018, 04:07 AM
#11
Yeah driving it I can稚 tell any problem but on the dyno is where the problem occurred. In the high rpm痴 he said it stuttered and showed me the dyno graph where it dipped over and over like crazy. Hopefully it痴 nothing serious. If not the plugs then I値l try to put the stock throttle body back on or BMS drop in filter.
QUOTE=C7/Z06 Man;1596806301]If you can't tell if you have a problem now the computer may have made some adjustments for that intake. If I remember correctly GM builds in a 25% +/- AFR adjustment capability. That way the cars run fine year round in Alaska or Arizona.[/QUOTE]
QUOTE=C7/Z06 Man;1596806301]If you can't tell if you have a problem now the computer may have made some adjustments for that intake. If I remember correctly GM builds in a 25% +/- AFR adjustment capability. That way the cars run fine year round in Alaska or Arizona.
[/QUOTE]
03-18-2018, 08:45 AM
#12
Race Director
Member Since: Jul 2007
Location: Texas Hill Country
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fuel trims don't apply to WOT, only part throttle and a dyno pull isn't done at part throttle.
injen intake? aren't those for civics? that's the first thing I would remove.
how hot were the intake temps and coolant temps when you made your pull? there have been plenty of Z's dyno in the 550 range or maybe a bit less. if there was some temp then the ECM could easily have been removing spark lead and killing HP. did they do a log for you? what was the timing, IAT temp, ECT temp, etc?
just the fact they recommended spark plugs on a 4k mile car makes me raise my eyebrows. the dyno pull is the new oil change, lol....just get it on the rack and sell something.
injen intake? aren't those for civics? that's the first thing I would remove.
how hot were the intake temps and coolant temps when you made your pull? there have been plenty of Z's dyno in the 550 range or maybe a bit less. if there was some temp then the ECM could easily have been removing spark lead and killing HP. did they do a log for you? what was the timing, IAT temp, ECT temp, etc?
just the fact they recommended spark plugs on a 4k mile car makes me raise my eyebrows. the dyno pull is the new oil change, lol....just get it on the rack and sell something.
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The Rock1 (03-20-2018)
03-18-2018, 10:26 AM
#13
I壇 remove the intake, change back to stock and find a new tuner who will Log your pull. Ridiculous he didn稚 log your dyno, even if you didn稚 get a tune with those mods you want to know the details.
Last edited by Cercone; 03-18-2018 at 10:31 AM.
03-18-2018, 11:07 AM
#14
Melting Slicks
Worst dyno thread ever.
no baseline
no log
no troubleshooting
no baseline
no log
no troubleshooting
03-18-2018, 12:16 PM
#15
Safety Car
Would like to know.
fuel trims don't apply to WOT, only part throttle and a dyno pull isn't done at part throttle.
injen intake? aren't those for civics? that's the first thing I would remove.
how hot were the intake temps and coolant temps when you made your pull? there have been plenty of Z's dyno in the 550 range or maybe a bit less. if there was some temp then the ECM could easily have been removing spark lead and killing HP. did they do a log for you? what was the timing, IAT temp, ECT temp, etc?
just the fact they recommended spark plugs on a 4k mile car makes me raise my eyebrows. the dyno pull is the new oil change, lol....just get it on the rack and sell something.
injen intake? aren't those for civics? that's the first thing I would remove.
how hot were the intake temps and coolant temps when you made your pull? there have been plenty of Z's dyno in the 550 range or maybe a bit less. if there was some temp then the ECM could easily have been removing spark lead and killing HP. did they do a log for you? what was the timing, IAT temp, ECT temp, etc?
just the fact they recommended spark plugs on a 4k mile car makes me raise my eyebrows. the dyno pull is the new oil change, lol....just get it on the rack and sell something.
Blurspeed: I would check the 'plug wires' to make sure they are secure at both ends.
Last edited by C7/Z06 Man; 03-18-2018 at 03:23 PM.
03-18-2018, 03:59 PM
#16
I致e always had great success with Injen so didn稚 mind saving a little money vs Haltech or AFE. I don稚 have any data because he never hooked it up for whatever reason. So I don稚 know the intake and coolant temps. He said next time he値l hook it up so could see all the data. This shop does all the muscle cars here on th island. They are like the only one here and they installed all my stuff before and never had any issues. They built a Procharged C7 Grand Sport too. I trust the shop so hopefully they値l get it right. If it痴 not the plugs then I値l go back to BMS drop in filter or stock throttle body and see if fixes the problem. Thanks for the reply!
fuel trims don't apply to WOT, only part throttle and a dyno pull isn't done at part throttle.
injen intake? aren't those for civics? that's the first thing I would remove.
how hot were the intake temps and coolant temps when you made your pull? there have been plenty of Z's dyno in the 550 range or maybe a bit less. if there was some temp then the ECM could easily have been removing spark lead and killing HP. did they do a log for you? what was the timing, IAT temp, ECT temp, etc?
just the fact they recommended spark plugs on a 4k mile car makes me raise my eyebrows. the dyno pull is the new oil change, lol....just get it on the rack and sell something.
injen intake? aren't those for civics? that's the first thing I would remove.
how hot were the intake temps and coolant temps when you made your pull? there have been plenty of Z's dyno in the 550 range or maybe a bit less. if there was some temp then the ECM could easily have been removing spark lead and killing HP. did they do a log for you? what was the timing, IAT temp, ECT temp, etc?
just the fact they recommended spark plugs on a 4k mile car makes me raise my eyebrows. the dyno pull is the new oil change, lol....just get it on the rack and sell something.
03-18-2018, 04:01 PM
#17
Yeah if it痴 not the plugs then I値l go back to stock throttle body or BMS drop in. This is the only shop out here in Hawaii so I trust them. Never had any issues with the shop before for previous work. They also did a ProCharged C7 GS which was super fast. Not sure why he never hooked up the car for data.
03-18-2018, 04:04 PM
#18
Sorry. I wasn稚 provided with anything. We never did a baseline. Was the first dyno pull ever for this car. Not sure why there was no log or troubleshooting. I know he had other customers that day so he couldn稚 work on mine at the moment. I was on the books for intake install and 3 dyno pulls. Other customers with appointments that day and next opening isn稚 till 7 Apr. They are the only racing shop here in Hawaii that works on Muscle cars so they are always busy and swamped.
QUOTE=Pacembellum;1596807522]Worst dyno thread ever.
no baseline
no log
no troubleshooting[/QUOTE]
QUOTE=Pacembellum;1596807522]Worst dyno thread ever.
no baseline
no log
no troubleshooting[/QUOTE]
03-18-2018, 04:05 PM
#19
Team Owner
I think your lucky if something is not damaged you can't add a bunch of mods on the stock tune then run the crap out it on the dyno for max hp pulls. With out having a tuner
doing an actual tune. Seems you went way off on the AFR to make to studder. Hope it is ok!
doing an actual tune. Seems you went way off on the AFR to make to studder. Hope it is ok!
Last edited by 3 Z06ZR1; 03-18-2018 at 04:06 PM.
03-18-2018, 04:06 PM
#20
Ok thank you. I値l let him know when I bring it in to check the plug wires also when he checks the plugs. Hopefully it値l all work out. If not then BMS drop in filter or stock throttle body is going back on.
QUOTE=C7/Z06 Man;1596807865]My understanding about the GM fuel trims is that they don't apply like you said to WOT/Open Loop; unless the car is "adding" fuel to part throttle, than that amount/+ % will be added/carried over to WOT.
Blurspeed: I would check the 'plug wires' to make sure they are secure at both ends.[/QUOTE]