Disappointing dyno results 370z 7at

Jordo! · 05-25-2015, 07:16 PM

OP (and everybody else):

Provided you use the same dyno, whatever kind it is, and use the same correction factor, and dyno in the same gear (again, 4th is fine -- less stress on the motor), you can always determine magnitude of gains or losses by the percent of change from your baseline (of course, that means you need a baseline...).

In other words, absolute values are less meaningful than the delta (i.e., a gain of "5 whp" isn't as clear as a gain of "3% from baseline"). Likewise, don't dismiss gains under the curve over peak gains.

A good way to evaluate overall change is to look at the % change where hp and tq cross (i.e., 5252 RPM).

Peak values are only critical for drag racing time and and top speed, but for daily driving and your "butt dyno", you will be more aware of changes much lower in the powerband, and off the line most of all.

Maddog · 09-25-2015, 05:30 AM

Thought I would update the thread just so you know I took advice

I mentioned earlier than I had Z1 intake tubes , I actually had some Mishimoto ones which arent as good quality as the Z1 ones and since my tuner reckoned the MAF readings were a little screwy I ordered some HPS ones (incidentally there is very little difference between the two) to be sure.

Also bought some Berks test/decat pipes and fitted those

So before was 309.4 flywheel HP

After just fitting the above parts it produced 328 flywheel HP but it had leaned out .....a lot !

After an Uprev remap and smoothing it made 345.9hp. +36.5hp increase

The car drives a lot better especially at the top end and ultimately that's what's really important , I will however get a run done on a dynojet dyno to compare at some point

So thanks all

05-25-2015, 07:16 PM	#1 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 420	OP (and everybody else): Provided you use the same dyno, whatever kind it is, and use the same correction factor, and dyno in the same gear (again, 4th is fine -- less stress on the motor), you can always determine magnitude of gains or losses by the percent of change from your baseline (of course, that means you need a baseline...). In other words, absolute values are less meaningful than the delta (i.e., a gain of "5 whp" isn't as clear as a gain of "3% from baseline"). Likewise, don't dismiss gains under the curve over peak gains. A good way to evaluate overall change is to look at the % change where hp and tq cross (i.e., 5252 RPM). Peak values are only critical for drag racing time and and top speed, but for daily driving and your "butt dyno", you will be more aware of changes much lower in the powerband, and off the line most of all. jrb55gh likes this. __________________ Enjoy it. Destroy it.

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09-25-2015, 05:30 AM	#2 (permalink)
Maddog Base Member Join Date: Dec 2013 Location: Uk Posts: 94 Drives: 2012 370z GT a/t Rep Power: 13	Thought I would update the thread just so you know I took advice I mentioned earlier than I had Z1 intake tubes , I actually had some Mishimoto ones which arent as good quality as the Z1 ones and since my tuner reckoned the MAF readings were a little screwy I ordered some HPS ones (incidentally there is very little difference between the two) to be sure. Also bought some Berks test/decat pipes and fitted those So before was 309.4 flywheel HP After just fitting the above parts it produced 328 flywheel HP but it had leaned out .....a lot ! After an Uprev remap and smoothing it made 345.9hp. +36.5hp increase The car drives a lot better especially at the top end and ultimately that's what's really important , I will however get a run done on a dynojet dyno to compare at some point So thanks all