Which graph would you choose?
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TECH Fanatic
Joined: Dec 2002
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From: htown
Which graph would you choose? http://i140.photobucket.com/albums/r...sports/800.jpg
Built 350z with a stroker ar 20psi
http://ktgutz.home.comcast.net/ecsdyno.jpg
346 supercharged 15psi
That is a horrbile graph of a 346 IMO. Someone on another forum is stating this is a flatter graph compared to a 350z. What are you opinions
http://i140.photobucket.com/albums/r...-dyno2-633.jpg
This was at 13psi on a 350z.
Built 350z with a stroker ar 20psi
http://ktgutz.home.comcast.net/ecsdyno.jpg
346 supercharged 15psi
That is a horrbile graph of a 346 IMO. Someone on another forum is stating this is a flatter graph compared to a 350z. What are you opinions
http://i140.photobucket.com/albums/r...-dyno2-633.jpg
This was at 13psi on a 350z.
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Teching In
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that 350Z is stroked to 4.24 liters with 20 psi on a twin turbo kit, ported heads, cams, big *** exhaust, etc
that said, based on dynographs alone, I'd still take the supercharged 346 car. Better throttle response, no lag and it has better low end power as well as more top end power. I own a 460-480whp vortech supercharged Z, so it's not like I'm biased against Z's or anything. Now as far as handling goes I'd take the 350Z
here's all three of those graphs overlayed
346 is green
4.24 stroked 350Z TT is blue
regular 350Z TT is red
....yeah I'd take the 346
the normalization of the 20psi 350Z graph is a little misleading with making it look flat when really it's not so flat. Looks more like a supra curve - which would probably look flat if you only showed 6000-9000 rpms
honestly the Z is going to need nitrous early in the powerband and have it taper off with a progressive controller to have any chance of keeping the torque curve somewhat flat. I dunno, I'm just not a fan of turbo curves in general. The torque curve always ends up shooting up and dropping fast at some point in the powerband
that said, based on dynographs alone, I'd still take the supercharged 346 car. Better throttle response, no lag and it has better low end power as well as more top end power. I own a 460-480whp vortech supercharged Z, so it's not like I'm biased against Z's or anything. Now as far as handling goes I'd take the 350Z
here's all three of those graphs overlayed
346 is green
4.24 stroked 350Z TT is blue
regular 350Z TT is red
....yeah I'd take the 346
the normalization of the 20psi 350Z graph is a little misleading with making it look flat when really it's not so flat. Looks more like a supra curve - which would probably look flat if you only showed 6000-9000 rpms
honestly the Z is going to need nitrous early in the powerband and have it taper off with a progressive controller to have any chance of keeping the torque curve somewhat flat. I dunno, I'm just not a fan of turbo curves in general. The torque curve always ends up shooting up and dropping fast at some point in the powerband
Last edited by sentry65; Feb 22, 2007 at 03:30 PM.
Teching In
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Originally Posted by THE_SUPRA
i thought that the 3.5 nissan block was a P.O.S.?
maybe a couple years ago when people spent more time blowing it up than making decent power with it. The platform has matured and better parts are available now and there's more knowledge for getting reliable power
Last edited by sentry65; Feb 18, 2007 at 03:25 AM.
Staging Lane
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Originally Posted by sentry65
that 350Z is stroked to 4.24 liters with 20 psi on a twin turbo kit, ported heads, cams, big *** exhaust, etc
that said, based on dynographs alone, I'd still take the supercharged 346 car. Better throttle response, no lag and it has better low end power as well as more top end power. I own a 460-480whp vortech supercharged Z, so it's not like I'm biased against Z's or anything. Now as far as handling goes I'd take the 350Z
here's all three of those graphs overlayed....yeah I'd take the 346
the normalization of the 20psi 350Z graph is a little misleading with making it look flat when really it's not so flat. Looks more like a supra curve - which would probably look flat if you only showed 6000-9000 rpms
honestly the Z is going to need nitrous early in the powerband and have it taper off with a progressive controller to have any chance of keeping the torque curve somewhat flat. I dunno, I'm just not a fan of turbo curves in general. The torque curve always ends up shooting up and dropping fast at some point in the powerband
that said, based on dynographs alone, I'd still take the supercharged 346 car. Better throttle response, no lag and it has better low end power as well as more top end power. I own a 460-480whp vortech supercharged Z, so it's not like I'm biased against Z's or anything. Now as far as handling goes I'd take the 350Z
here's all three of those graphs overlayed....yeah I'd take the 346
the normalization of the 20psi 350Z graph is a little misleading with making it look flat when really it's not so flat. Looks more like a supra curve - which would probably look flat if you only showed 6000-9000 rpms
honestly the Z is going to need nitrous early in the powerband and have it taper off with a progressive controller to have any chance of keeping the torque curve somewhat flat. I dunno, I'm just not a fan of turbo curves in general. The torque curve always ends up shooting up and dropping fast at some point in the powerband
TECH Junkie
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From: its fucking cold
Looking at the two dyno's i'd take the 346 if i were looking for a daily driver type car. The graph of the Z starts at 3600 RPM. At that point in the run the car is making 300 rwtq. At 3600 rpm the 346 is making 525 rwtq. If i wanted a car to make top end runs i'd take the Z, but i like low end grunt and driveability.
Teching In
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the thing is that the 350Z dyno isn't showing is that on that particular car since it's turboed, the rpm that you start going full throttle at is going to have an effect on the dyno curve since it takes a split second for the turbos to spool up so the graph is a little misleading in a way. It really does have a little more low end power than it looks like it shows.
That's the beauty of an NA or supercharger engine, there isn't any lag to get "full" boost that the rpm you're at is capable of delivering with a turbo.
The tuner who tuned that Z adjusts the turbo gain with higher boosted setups so the turbos spool later to help prevent overboost. If the car ran less boost, the gain would be adjusted to let the turbos spool earlier for more power down low, but obviously less up high. Generally with 16+psi on even the 4.24 liter engine, power below 3500 rpms isn't going to be anything special
That graph I posted has 3 graphs on it BTW if anyone missed it. The 346's graph is slightly faded. I should have made it stand out more...
anyway, the 4.24 stroker kit is freaking nice on the Z. It should add roughly 50-55whp pretty much across the board on an otherwise bone stock engine if it had the same compression ratio. Still not as big or as powerful as a LS1/2/6/7 engine, but with some moderate forced induction the car will be decently quick and well rounded for different types of motorsport driving
That's the beauty of an NA or supercharger engine, there isn't any lag to get "full" boost that the rpm you're at is capable of delivering with a turbo.
The tuner who tuned that Z adjusts the turbo gain with higher boosted setups so the turbos spool later to help prevent overboost. If the car ran less boost, the gain would be adjusted to let the turbos spool earlier for more power down low, but obviously less up high. Generally with 16+psi on even the 4.24 liter engine, power below 3500 rpms isn't going to be anything special
That graph I posted has 3 graphs on it BTW if anyone missed it. The 346's graph is slightly faded. I should have made it stand out more...
anyway, the 4.24 stroker kit is freaking nice on the Z. It should add roughly 50-55whp pretty much across the board on an otherwise bone stock engine if it had the same compression ratio. Still not as big or as powerful as a LS1/2/6/7 engine, but with some moderate forced induction the car will be decently quick and well rounded for different types of motorsport driving
Last edited by sentry65; Feb 21, 2007 at 02:22 PM.
11 Second Club
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From: Was New Orleans, but swam to Baton Rouge
I like the low end power of the 346. It makes more power and torque at 4500 rpms versus the other combo. I also noticed the scale of the graphs is different which can help some appear more flat than they really are.