Jump to content

G4 Thunder - Dual DBW Nissan VQ37HR


vonnyph
 Share

Recommended Posts

Hi All,

I am configuring a G4+Thunder wire-in ECU to run a Nissan 370z with Dual Drive-by-wire Throttles.  I need to know if TP(Main), TP(Sub) are configurable across all AN Volt Inputs ie. AN Volt 1-16 ??  Or am i only able to use AN Volt 1-12 ?

I am currently trying to use AN Volt 13 &14 for TP 2 (Main) and (Sub) but there's no options for it.  Im doing this as i am using an extension/breakout harness and its already been wired to pins D8 & D9.

Is this possible at all, or do i have to use a different input?

Thanks in advance !!!

Link to comment
Share on other sites

Thanks Scott,

I have now connected all 4 TPS wires to AN Volt channels 1 to 4 and both throttles are now working.  There are still some throttle related error messages to work out, but at least both throttles are opening/closing in sync.

But I'm also having another issue Scott, where the RPM is quite erratic.  Triggers are connected in piggy-back and Trigger Setup used is "VQ35".  I have yet to verify the scope pattern but i believe it is the same ie. "10-2, 10-2, 10-2".  At idle, the engine speed spikes excessively even with trigger filtering at "4".

Is there anything you can suggest Scott?  I'll also report back with the crank trigger scope as soon as I can. 

Regards,
Vonny.

Link to comment
Share on other sites

Hi Vonny,

We have not done a VQ37 ourselves.  It sounds like the ECU is seeing trigger errors. As the crank and cam sensors are hall sensors there is not a lot of options you can try. You may need to adjust the Trig 1 and/or rig 2 'Edge' setting. When adjusting this you will need to recheck and likely change the trigger offset slightly.

Scott

 

Link to comment
Share on other sites

little more to the VHR37 than your seeing as the cam trigger are different to a DE/REV UP motor , the HR and VHR are the same crank trigger but I am sure the cam trigger is different.

 

Do you still have the variable valve lift on the VHR?

Edited by AbbeyMS
Link to comment
Share on other sites

Hi AbbeyMS,

Yes it still has the VVEL and CVTC. I think you're correct in saying that the issue lies with the cam trigger.  I have scoped the crank trigger and both LH & RH inlet cam position sensors and compared it to the VQ35DE.  The patterns appear the same but the phasing is slightly shifted.  I guess this is what is causing the trigger errors and is possibly due to the VVEL/CVTC.  

Scope1.GIF

Scope2.GIF

Scope3.GIF

VQ35DE.GIF

Sorry about the separate screen shots, I wasn't able to display the complete 720deg cycle in one screen. 

Is there another trigger signal that can be used that wont shift or is there an option for a custom trigger setup?  

Link to comment
Share on other sites

Here is a similar image I have for the VQ37:

nissan_370z_trigger_info.thumb.jpg.ed7a4

As you mentioned, the phasing looks to be different and also the signals appear to be inverted. This could be a problem on the cams when the ECU is looking for a rising or falling edge. 

None of our other Nissan trigger modes are even close to the VQ37.

Scott

 

Link to comment
Share on other sites

  • 2 months later...

Is the VQ35HR different to the regular VQ35de? as I'm sure we have had an HR motor running in a boat that had been converted to a cable throttle.

yup it is different.

they probably used a different trigger wheel or exchanged the trigger cam sprocket/gear  from the DE.

Link to comment
Share on other sites

Is the VQ35HR different to the regular VQ35de? as I'm sure we have had an HR motor running in a boat that had been converted to a cable throttle.

 Yes trigger wheel (flywheel) pattern is different and the cam triggers are in a different position on the inlet/exhaust cams.

Is it better for you guys to have a car or are you happy to work with Scope readings? I have a HR car as a track car.

 

Link to comment
Share on other sites

Okay will get my track car in the workshop and get a scope image.

The crank signal should be the same between the HR and VHR motor as the flywheel is the same part and the block is the same part so the crank trigger is in the same position.

The main difference between the 2 motors is the top end.

350Z HR has variable inlet/exhaust cam and the 370Z has only variable intake but also variable lift. The intake cam/phase sensors are in a different position between the 2 motors.

Generic scope from Nissan workshop manual.

QSFJwp.jpg
 

 

 

 

 

 

Link to comment
Share on other sites

Hi Daniel,

Simon has had to take off on leave rather unexpectedly.  So I will step in as the middleman and try to get this underway.  I have just passed it on to engineering tonight for their comments and I will report back tomorrow if they need anything further.

Do you have any further insight on if this is actually the same as the VQ37VHR or HR? (sorry I dont know these engines well)?  I think you originally said it was the same but in the other thread you linked to it seems to contradict that...

Link to comment
Share on other sites

Thank you Adamw,

I went back into my blown VHR engine box and only the intake camshaft has the trigger wheel which appear to have the same teeth pattern as the HR engine.

However the exhaust does not have any (fixed/single gear).

The crank shaft use the same trigger pattern(also the same flywheel) in both VQ35HR & VQ37VHR

The intake cam teeth pattern seem to be the same in both engine. (As per the picture below)

VQ35HR on the left   and  VQ37VHR on the right

16826056_1002656279868475_36034539031679

 

Edited by Daniel
Link to comment
Share on other sites

l6pMPd.jpg

 

sorry for the phone picture of scope. This scope came from a 370Z that we are having issues with the cam/s scope are offset to the crank. Seems we are having issues with the crank trigger/wiring. 

I think the phasing is the same between the HR and VHR thou which is good.

 

 

Edited by AbbeyMS
Link to comment
Share on other sites

Hi Guys,

We already have some data on the VQ37VHR and our engineering team has stated from their initial look that they appear to be the same.  One problem we will have with this engine is according to Daniels data the exhaust cam can move 80 degrees, but we are limited (by hardware) to a maximum of 70 degrees.  So we are never going to be able to give you more than 70 degrees retard from its home position.  I suspect it probably only had that much movement to allow some sort of EGR or emissions strategy so in my mind this shouldnt be a big deal to most performance users.

Link to comment
Share on other sites

  • 1 year later...

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...
 Share

×
×
  • Create New...