Nissan 370Z Forum
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Nissan 370Z Forum (http://www.the370z.com/)
-   Intake/Exhaust (http://www.the370z.com/intake-exhaust/)
-   -   motordyne M370 manifold - round 2 (http://www.the370z.com/intake-exhaust/26467-motordyne-m370-manifold-round-2-a.html)

efuseakay 10-18-2010 01:01 AM
Quote:
Originally Posted by TARDCORE (Post 767550)
why do people keep speaking of tuning as if it is so easy for us to do? The VHR is a falesafe for Nissan. VVEL doesn't allow us to do any real tuning. VVEL is also very annoying as most Z owners have realized the slight delay in throttle response. Not this A/F raito bs that we can do and even then, I don't think A/F ratio adjustments on a car with full bolt ons will really make a difference. Tony at FI kinda proved that when they had cleaned up the A/F ratios when the LTH's were being tested. Everytime I return to this site I always see people talking about how after a tune the gains will increase. This isn't an LS7, it's a VQ. I am supprised to see a lot of F/I set ups running for so long without any majoy issues or at least, we haven't heard of any.
Oldschool reasoning. Nissan really stuck one to tuners with VVEL.

:owned:

Trips 10-18-2010 01:13 AM
Quote:
Originally Posted by efuseakay (Post 770005)
Oldschool reasoning. Nissan really stuck one to tuners with VVEL.

:owned:
:iagree:

98intrigue 10-31-2010 01:22 PM
Your graph between 5000-6200 rpms is exactly how the end of my graph looks from 6500-7500 rpms. My hp climbs steadily to 6500 rpms, drops dramatically, and then finally hits peak at around 7200 rpms. It looks like a U at the end of the graph.

I just asked for my graphs from my tuner, so hopefully we can compare graphs.

98intrigue 10-31-2010 10:19 PM
http://i55.tinypic.com/zvedc3.jpg

theDreamer 10-31-2010 10:26 PM
Quote:
Originally Posted by TARDCORE (Post 767550)
why do people keep speaking of tuning as if it is so easy for us to do? The VHR is a falesafe for Nissan. VVEL doesn't allow us to do any real tuning. VVEL is also very annoying as most Z owners have realized the slight delay in throttle response. Not this A/F raito bs that we can do and even then, I don't think A/F ratio adjustments on a car with full bolt ons will really make a difference. Tony at FI kinda proved that when they had cleaned up the A/F ratios when the LTH's were being tested. Everytime I return to this site I always see people talking about how after a tune the gains will increase. This isn't an LS7, it's a VQ. I am supprised to see a lot of F/I set ups running for so long without any majoy issues or at least, we haven't heard of any.
Why, what is so extreme about our tuning?
The only item we are unable to adjust right now is VVEL, which really has been a zero issue with basic forced induction. Now, if you want to lower the compression ratio, build the motor, or something else extreme then VVEL will be a factor but really it is a non-issue.

christian370z 10-31-2010 11:26 PM
Plus, everytime I see someone say that VVEL is not going to be cracked, I remember how many thought that the R35 GTR might be untunable with all the coding Nissan built into the ECU but obviously that was blown out of the water once the aftermarket started picking up with those cars.

theDreamer 11-01-2010 09:16 AM
Quote:
Originally Posted by christian370z (Post 790490)
Plus, everytime I see someone say that VVEL is not going to be cracked, I remember how many thought that the R35 GTR might be untunable with all the coding Nissan built into the ECU but obviously that was blown out of the water once the aftermarket started picking up with those cars.
Exactly, now the pace might not be equal to the GT-R or other cars, but there seem to be companies willing to stick with the VQ37 and hopefully more will come.

Endgame 11-01-2010 12:36 PM
If the DOD could be hacked, someone will find a way to crack the VVEL.

Jordo! 11-01-2010 01:55 PM
Quote:
Originally Posted by 98intrigue (Post 790352)
That dip at the end can be tuned out -- it has to do with OEM tuning approaching fuel cut.

98intrigue 11-01-2010 02:08 PM
Quote:
Originally Posted by Jordo! (Post 791149)
That dip at the end can be tuned out -- it has to do with OEM tuning approaching fuel cut.
Any suggestions on how to do that? Brian at EFI was tuning my car for over 2 hours and couldn't figure out how to alleviate the problem.

esfourteen 11-01-2010 04:48 PM
Quote:
Originally Posted by 98intrigue (Post 791194)
Any suggestions on how to do that? Brian at EFI was tuning my car for over 2 hours and couldn't figure out how to alleviate the problem.

Jordo has tons of great tips on tuning such as: "That can be fixed with tuning" and "you can tune that out"

Endgame 11-01-2010 04:55 PM
Quote:
Originally Posted by esfourteen (Post 791574)
Jordo has tons of great tips on tuning such as: "That can be fixed with tuning" and "you can tune that out"
not taking anyone's side, but that was a funny post!

:icon18:

Staples 11-02-2010 10:27 PM
Quote:
Originally Posted by 98intrigue (Post 791194)
Any suggestions on how to do that? Brian at EFI was tuning my car for over 2 hours and couldn't figure out how to alleviate the problem.
When I had my car tuned, we were seeing some dips like that, so we added fuel to drop it down to 12.5 - 12.6 at wide open, added 2 degrees of timing and I ended up making 8whp more. I've seen a lot of the 370z and G37 tuned with UpRev and for some reason, they like extra fuel. 12.5 - 12.8 A/F seems to be making the most amount of horsepower / torque.

eddieconfetti 11-03-2010 01:58 AM
Blame the government for the stupid car rules we have!!!!!!!

98intrigue 11-03-2010 07:44 AM
Quote:
Originally Posted by Staples (Post 793515)
When I had my car tuned, we were seeing some dips like that, so we added fuel to drop it down to 12.5 - 12.6 at wide open, added 2 degrees of timing and I ended up making 8whp more. I've seen a lot of the 370z and G37 tuned with UpRev and for some reason, they like extra fuel. 12.5 - 12.8 A/F seems to be making the most amount of horsepower / torque.
Yes, my tuner said that he's seen 12.8 to be the sweet spot. I remember looking at the UpRev window and seeing the fuel right st 12.8, so I'm not sure why the graph shows 13.2.


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