04 DE breather mods, tuned/dyno
Hi guys. Last week I dropped my car off with a bunch of boxes I’ve been accumulating, mostly bought here from the forum. They installed a plenum spacer, some APS high flow cats, an APS 2.5” cat back exhaust that was modified for turbo use by fabricating a great looking Y pipe, and a full Nismo intake that already came with the car. A bizarre note, I know I had ordered the 5/16 plenum spacer but they said they had to modify the strut bar to fit it, so that makes me think I received a 5/8, but anyway it’s installed. They did a quick dyno pull for me before I left, needless to say I was sorely disappointed at 188hp. He said the dyno was a “heart breaker” SAE model or whatever and that nearly everyone is surprised when they see the low numbers. That’s with 19,000 miles, a couple thousand above sea level, high humidity, and probably 80° out. 6 speed MT. I was a bit concerned and called the tuner back asking if he thought my motor/clutch was ok, but he reassured me it was normal. Anyway, he sent me the new numbers after everything was installed, gained about 37hp and 39 ft pounds of torque, which actually surprised him. Haven’t picked the car up yet as he’s concerned about the rigidity of the exhaust and wants to add a flex, but says the car sounds awesome. Cant wait to try it out. Been trying to upload the dyno forever, nothing :( |
188hp is extremely extremely low - your car is really really down on power! An average middle of the road 350z bone stock and/or some minor mods will make 230 to 240hp!
With your mods and a tune you should be closer to 260hp ... something is wrong |
Yea it sure has me thinking. It “feels" strong and powerful, but that says nothing. He says they don’t detect clutch slip, and there’s good compression, maybe his dyno is off?? On another note, what’s up with the new upload feature.... browse device, pick photo, it "loads" onto window, I push Upload, then it disappears. It’s in my Album too. Will keep trying.... |
Sounds like a bufu shop to me.
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Originally Posted by Wet feet
(Post 10976504)
Yea it sure has me thinking. It “feels" strong and powerful, but that says nothing. He says they don’t detect clutch slip, and there’s good compression, maybe his dyno is off?? On another note, what’s up with the new upload feature.... browse device, pick photo, it "loads" onto window, I push Upload, then it disappears. It’s in my Album too. Will keep trying.... Try using the 'advanced' features to upload - sometimes mine does that too! |
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Seems way low....y pipe is lacking imho
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Originally Posted by guitman32
(Post 10976507)
Sounds like a bufu shop to me.
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Originally Posted by travlee
(Post 10976517)
Seems way low....y pipe is lacking imho
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Welds may be nice, but by eyeball, I'm guessing that the volumetric flow rate will be reduced with this ypipe.
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Did they tune it as well, or just install the parts and re-dyno?
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They installed everything and then actually tuned it. I think he said they were on the machine a good 5 hours or so. I get what you mean on the y pipe. Originally I had walked in the shop wanting a dual set up, but he said there’s usually noticeable torque loss down low that’s difficult if not impossible to tune out. So he recommended a y pipe. |
Alright well in that case nothing sounds too crazy...the absolute number is less important than trusting the gains on that specific dyno.
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Originally Posted by Wet feet
(Post 10976519)
In design, or what do you mean? see this thread https://my350z.com/forum/intake-exha...e-on-a-de.html |
Yea I’ve read lots of y pipe threads, and you may be right. I could throw a Motordyne in there someday. I imagine even as it stands the new one must flow better than the stock crap. So basically my reason for posting was to get feedback, so I appreciate that. I’m wondering if the 37-39 gains were about on par for what I did? As that’s what’s most important, not necessarily the numbers themselves. |
the Y-pipe looks very nice and sure there may be some inefficiencies with the 90s but it's not the reason youre down 40 additional HP...
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I do believe there’s another dyno shop here, so I’ll probably go by and do a comparison. I’m curious what differences or discrepancies may show up. The motor itself runs fantastically and feels strong. |
I wonder if theyre running a zero correction factor??
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Originally Posted by bealljk
(Post 10976540)
I wonder if theyre running a zero correction factor??
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