Jump to content
flipski

nissan vq35de

Recommended Posts

Our 350Z base map has injector deadtimes and ignition dwell times for the stock injectors and coils.  I have notes that the injector flowrate on our car was 284cc @ 345Kpa, which was the base fuel pressure.  The fuel system type is returnless.

 

Share this post


Link to post
Share on other sites

Thank you very much! I will try to play with VE tuning this winter. I did run a track event last weekend with the G4+, I was able to tweak my fuel and throttle after a mostly street tune and my engine didn't go KABOOM. :D

One last thing, what about Short pulse adder ? they are all zeros...

 

Share this post


Link to post
Share on other sites
20 hours ago, flipski said:

One last thing, what about Short pulse adder ? they are all zeros...

Leave SPWA at zero, since you have such small injectors you will never operate with a short pulse width.

Share this post


Link to post
Share on other sites

Alright , So I finally decided to switch to modeled mode for my car and I have a few question regarding the predefined values in the basemaps.

1. Fuel injector are setup with 285cc at 43.5psi whereas Adam mentioned 284cc at 345kpa or 50psi ? But since the fuel main settings is set at 43.5psi instead of the 50psi that my car is supposed to run, I guess the pulse width is still correct even tho the fuel pressures are not the one the car is experiencing ?

2. VVT table. In the traditional mode, the VVT Inlet table has the rpm and TPS axis. By using this table as is, I would need to setup a 3d VE table? with rpm,mpg and tps. Since changing the intake cam angle should affect the VE of the cell the engine currently sit in. Or should I just swap the axis on the VVT to the MPG ? and deal with 3d VE tables after I get better at tuning.

3. what should be a good starting point for a VE cell ? I've noticed the traditional cell value don't match up after switching to Modeled equation ? I am running lean everywhere and since I am fuel tuning via datalog, I want to make sure I am not melting something before I hit the dyno and run a full VVT and ign timing tuning session.

Thank you

 

Edit: 1 more question. I've changed my intake manifold. It is a Kinetix velocity , made of stainless steel which is a bad heat conductor ( at least a lot lower than the aluminum plenum). Does the charge temp correction table populated from trial and errors ? or is there a specific formula to it ? Thanks

Share this post


Link to post
Share on other sites
58 minutes ago, flipski said:

Fuel injector are setup with 285cc at 43.5psi whereas Adam mentioned 284cc at 345kpa or 50psi ? But since the fuel main settings is set at 43.5psi instead of the 50psi that my car is supposed to run, I guess the pulse width is still correct even tho the fuel pressures are not the one the car is experiencing ?

You need to input the correct data otherwise the error will get baked into the VE table.  (VE table will need larger numbers if your injectors actually flow less than you tell the ecu they flow).

 

1 hour ago, flipski said:

2. VVT table. In the traditional mode, the VVT Inlet table has the rpm and TPS axis. By using this table as is, I would need to setup a 3d VE table? with rpm,mpg and tps. Since changing the intake cam angle should affect the VE of the cell the engine currently sit in. Or should I just swap the axis on the VVT to the MPG ? and deal with 3d VE tables after I get better at tuning.

It is generally easiest to use the same parameter on the axis of your VVT table as your fuel table.

 

1 hour ago, flipski said:

3. what should be a good starting point for a VE cell ? I've noticed the traditional cell value don't match up after switching to Modeled equation ? I am running lean everywhere and since I am fuel tuning via datalog, I want to make sure I am not melting something before I hit the dyno and run a full VVT and ign timing tuning session.

It will be completely different.  Typical VE numbers will be about 50-60% at idle increasing to 100-120% at peak torque.

 

1 hour ago, flipski said:

1 more question. I've changed my intake manifold. It is a Kinetix velocity , made of stainless steel which is a bad heat conductor ( at least a lot lower than the aluminum plenum). Does the charge temp correction table populated from trial and errors ? or is there a specific formula to it ? Thanks

Trial & error/testing.  On the dyno you can get a feel for it by varying air temp while keeping coolant temp relatively constant.  You can often vary air temp by directing air from behind the radiator into the intake.

Share this post


Link to post
Share on other sites
On 10/16/2018 at 6:42 AM, Adamw said:

Our 350Z base map has injector deadtimes and ignition dwell times for the stock injectors and coils. 

 

Hi Adam, sorry to up an old 3D. I have the N350+ on my 350Z. My car is supercharged (built engine) running @0.83bar and I've already the tune done.

I've seen the dwell time tune setting is between 3.9ms and 3.5ms @13/14v. Coils are stock ones.

Now I have a set of Okada plasma direct to install. Do you know if any modification on dwell time is to be done? Maybe increasing a little bit around 4ms flat @13/14v?

Share this post


Link to post
Share on other sites

I would only increase dwell if you were getting noticable misfires.  If it ran fine with the orignal lower dwell then you are only heating the coils more and shortening their life by giving it more dwell.

Share this post


Link to post
Share on other sites
On 7/9/2019 at 11:22 AM, Adamw said:

I would only increase dwell if you were getting noticable misfires.  If it ran fine with the orignal lower dwell then you are only heating the coils more and shortening their life by giving it more dwell.

Hi Adam thanks for reply and your advice. :)

No i don't have any misfire so far. at least nothing logged into the ecu. Only event I have is "rpm limit"....which was not happening before, or at least I didn't notice since ecu statistics was reporting a max engine speed above rpm limit of 6700rpm. Now seems to be cutting around 6400/6500rpm from logs. Anything I can do?

 

Attached my tune, would you be so kind to have a look? just for an advice in case of any. :)

 

 

 

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

×
×
  • Create New...