Stock 350z Hp diffrences?
#1
Registered User
Thread Starter
Join Date: Jun 2004
Location: South Florida
Posts: 37
Likes: 0
Received 0 Likes
on
0 Posts
Stock 350z Hp diffrences?
It seems to me that ppl take their z's to the dyno and even if both cars are stock sometimes u get slight hp differences why is this.
i kno its a dumb question but plz tell me why
i kno its a dumb question but plz tell me why
#5
Registered User
iTrader: (1)
Join Date: Jun 2004
Location: Naples,Fl
Posts: 630
Likes: 0
Received 0 Likes
on
0 Posts
btw: both dynos were calibrated to give actual WHP. one was a clayton in ground dyno and the other was above ground.
the clayton dyno is a chassis dyno but has different calibration settings. since we race porsches we had to set it to the REAL figure.
i guess if our dyno is wrong than my friend chris barnes's Turbo S2000, on cover of the new turbo mag, didnt really pull 559whp? hmmm......
john
the clayton dyno is a chassis dyno but has different calibration settings. since we race porsches we had to set it to the REAL figure.
i guess if our dyno is wrong than my friend chris barnes's Turbo S2000, on cover of the new turbo mag, didnt really pull 559whp? hmmm......
john
Trending Topics
#8
Registered User
iTrader: (1)
Join Date: Jun 2004
Location: Naples,Fl
Posts: 630
Likes: 0
Received 0 Likes
on
0 Posts
depends on the engine then, i guess. there are soo many variables that would contribute to a lower or higher figure. such as driving style, mileage, even how the car is strapped to the dyno affects the figures.
john
john
#9
Registered User
Join Date: Apr 2004
Location: Langhorne, Pennsylvania
Posts: 614
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by Black03z
yes but can one stock engine actually produce more hp under the same conditions then another??
yes but can one stock engine actually produce more hp under the same conditions then another??
Imo these differences in dynos are caused by either the ECU having "learned" differently or differences in tire weights(17" v 18" v 19").
#10
Registered User
iTrader: (1)
Join Date: Jun 2004
Location: Naples,Fl
Posts: 630
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by Black03z
yes but can one stock engine actually produce more hp under the same conditions then another??
yes but can one stock engine actually produce more hp under the same conditions then another??
his pulled 240 and mine 252
so yeh they can show different figures but you have to take into affect that with each second the coinditions outside and inside the car are ALWAYS changing which can lead to lower or higher figures.
dynos shouldnt be used to make accurate figures of what cars make. they should be used to see a difference in mods to get the most hp out of a car. and most def. a dyno graph is always off, because thats what your car made that day, that second. tomorrow you could pull lower of higher.
john
#12
Veteran
iTrader: (2)
at the factory, various components such as cam shafts, crank shafts, and many many other engine components are machined and grinded on the line.
but grinding wheels wear down, requiring them to be adjusted into the oproper position or replaced.
however with this they have a certain window that they are willing to tolerate high and low from perfect.
so, no, all engines are not created equal. to say if 1 is stronger than another due to these tolerance differences is impossible to say, as they keep these tolerances rather small. but even so, they are there.
but grinding wheels wear down, requiring them to be adjusted into the oproper position or replaced.
however with this they have a certain window that they are willing to tolerate high and low from perfect.
so, no, all engines are not created equal. to say if 1 is stronger than another due to these tolerance differences is impossible to say, as they keep these tolerances rather small. but even so, they are there.
#13
Registered User
Re: Stock 350z Hp diffrences?
Originally posted by Black03z
It seems to me that ppl take their z's to the dyno and even if both cars are stock sometimes u get slight hp differences why is this.
i kno its a dumb question but plz tell me why
It seems to me that ppl take their z's to the dyno and even if both cars are stock sometimes u get slight hp differences why is this.
i kno its a dumb question but plz tell me why
Now those tolerances often cancel out when a group of parts are assembled. In other words, roughly as many of the parts are plus as are minus in the assembly, and all is well. The particular engine will perform pretty much as designed.
*But* there are cases where the tolerances all stack one way in a particular assembly (engine). This can result in an engine that is rather far from design values. Power output can then also vary rather far from the design value because of the particular set of tolerance stackups in a particular engine assembly.
When hotrodders talk about blueprinting an engine, they're talking about hand selecting or modifying parts so that they are made as close as is humanly possible to design values (or to particular values the hotrodder knows will enhance performance). These blueprinted engines then perform optimally.
The factory can't afford to do this blueprinting. It is too time consuming and too expensive. So production engines will vary from one to the next, and their performance will vary from one to the next.
For big old slow reving V8 engines, tolerances can be pretty far out without much change in engine performance. But for our smaller higher reving engines, things have to be pretty close to design values, or performance will be fairly strongly affected.
Modern factories use CNC equipment which produce parts to pretty tight tolerances, so modern engines don't vary as much as engines made 10, 20, or 30 years ago. But you still won't find two engines that are *exactly* alike in a production run. Modern computer engine controls can compensate to a degree for these differences, but they aren't perfect either. So finding two engines which dyno exactly alike would be a matter of pure chance.
Thread
Thread Starter
Forum
Replies
Last Post
m_0g
Audio, Video & Electronics (DIY)
12
06-03-2021 10:05 AM
bcoffee20
Zs & Gs For Sale
5
11-19-2015 06:39 PM