Notices
Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by: KPower

The Definitive "VVT swap into 90-97 chassis" Megathread.

Thread Tools
 
Search this Thread
 
Old Jun 19, 2015 | 04:24 PM
  #181  
ThunderFox's Avatar
Junior Member
 
Joined: Mar 2012
Posts: 200
Total Cats: -12
From: Portugal
Default

Well I've done some math here (actually google ha!) and figured out mine is at 4 BAR while cruising, that's roughly 58 PSI. It's about the same that the previous engine did when cruising. Only when cold, the values are noticeably higher (slightly above 6 BAR).

There's also something else. I don't have VVT management still, and the engine is pulling quite fine! Is this to be expected, or does it have something to do with the fact that the pressure is high? Just wondering as the VVT runs on oil and may account for some pressure loss at cruising speeds with proper management.

Also another curiosity... Does the VVT stay normally opened (mucho overlap) or normally closed (almost no overlap) when there is no management installed, or if you were to pull the VVT solenoid plug?
Old Jun 19, 2015 | 04:26 PM
  #182  
Savington's Avatar
Thread Starter
Former Vendor
iTrader: (31)
 
Joined: Nov 2006
Posts: 15,442
Total Cats: 2,106
From: Sunnyvale, CA
Default

The VVT defaults to full retard (low overlap) when there's no power at the solenoid.
Old Jun 19, 2015 | 04:29 PM
  #183  
ThunderFox's Avatar
Junior Member
 
Joined: Mar 2012
Posts: 200
Total Cats: -12
From: Portugal
Default

Hmm, I see. Thanks!
Old Jun 19, 2015 | 05:04 PM
  #184  
Dunning Kruger Affect's Avatar
Senior Member
 
Joined: Sep 2013
Posts: 923
Total Cats: 67
Default

Originally Posted by leboeuf
Interesting. Mine is generally at 20-25 psi at idle; 40-45 psi while cruising around; and always 40psi while at the track being horse beat.
I noticed a ~5psi drop across the board when going to synthetic oil after break-in.
All numbers are with 10w30 oil.
Bottom end clearances were all ~1.8 thousandths.
No issues in 3k miles with 3 track days.

I should also note that my oil pressure sensor has been relocated to the firewall. Not sure if that messes with my numbers, but it wouldn't surprise me.
I replaced the dummy sender with the one off of the 94 (big ugly).
Old Jun 19, 2015 | 05:43 PM
  #185  
leboeuf's Avatar
Junior Member
iTrader: (1)
 
Joined: May 2013
Posts: 460
Total Cats: 57
From: Sandia Park, NM
Default

Yeah those numbers are with the sensor off the 1992.
I relocated it as shown in the upper left hand corner here:
Old Jun 19, 2015 | 05:48 PM
  #186  
ThunderFox's Avatar
Junior Member
 
Joined: Mar 2012
Posts: 200
Total Cats: -12
From: Portugal
Default

I just removed the stock one and threaded mine into the VVT pipe. Maybe the height of the sensor relative to the engine plays a role there?
Old Jun 20, 2015 | 11:25 AM
  #187  
Morello's Avatar
Junior Member
 
Joined: Jul 2009
Posts: 422
Total Cats: 45
From: Orange County, CA
Default

So I suppose I should show my completed setup. Thanks again for the help everyone. Will hopefully be hitting a dyno soon..
Attached Thumbnails The Definitive "VVT swap into 90-97 chassis" Megathread.-qlvwaqn.jpg  
Old Jun 24, 2015 | 08:05 PM
  #188  
my97miata's Avatar
Junior Member
 
Joined: May 2010
Posts: 135
Total Cats: -52
From: Tampa, Florida
Default

Very interested to see what numbers you get.
Old Jun 24, 2015 | 08:56 PM
  #189  
ThunderFox's Avatar
Junior Member
 
Joined: Mar 2012
Posts: 200
Total Cats: -12
From: Portugal
Default

I did not add that plastic "sleeve" around the fuel pipes, now that I think of it. I passed them through under the throttle body, they're rubbing on the manifold there (probably not a good idea).

I also replaced the fuel hoses with brand new 7mm ones.

Should I add some sleeving at least?

Mandatory install shot:

Old Jun 25, 2015 | 06:49 AM
  #190  
ThunderFox's Avatar
Junior Member
 
Joined: Mar 2012
Posts: 200
Total Cats: -12
From: Portugal
Default

I just remembered something. I did not install the bracket that holds the intake manifold to the lower part of the block, next to the alternator.

Will it be OK without it?
Old Jun 25, 2015 | 07:56 AM
  #191  
NBoost's Avatar
Junior Member
 
Joined: Sep 2014
Posts: 153
Total Cats: -84
From: Canton, GA
Default

From what I have read, that could sometimes cause the dreaded throttle body screw to vibrate lose and get sucked through the engine. It is there for a number of reasons, mainly vibration control and support though, which are important. I would bolt it up.
Old Jul 1, 2015 | 12:40 PM
  #192  
Morello's Avatar
Junior Member
 
Joined: Jul 2009
Posts: 422
Total Cats: 45
From: Orange County, CA
Default

Originally Posted by ThunderFox
I did not add that plastic "sleeve" around the fuel pipes, now that I think of it. I passed them through under the throttle body, they're rubbing on the manifold there (probably not a good idea).

I also replaced the fuel hoses with brand new 7mm ones.

Should I add some sleeving at least?
I reused the sleeving that was on the factory lines. I figure it can't hurt, and the line that goes over the intake manifold rubs ever so slightly on the hood so I feel better with it there.
Old Jul 8, 2015 | 08:05 PM
  #193  
Morello's Avatar
Junior Member
 
Joined: Jul 2009
Posts: 422
Total Cats: 45
From: Orange County, CA
Default

Results are in... and they are good.
https://www.miataturbo.net/engine-pe...-dynoed-85156/
Old Aug 18, 2015 | 02:00 PM
  #194  
kris5150's Avatar
Newb
 
Joined: Aug 2015
Posts: 16
Total Cats: 0
From: Slovenia
Default

Hey guys!

So i'm just at the end of my vvt swap into EUDM 1.6 NA ( 90km ), and i managed to fry the 01 coils, don't really have an idea why...
Now i want to just use the original 1.6 coils..is there any trick on how to connect them, or just leave as it was factory and call it a day?
btw, car has sequential spark from the factory..or so they say
More or less everything is wired up as to this thread..
https://www.miataturbo.net/engine-pe...r-72134/page1/
exept the coils as i somehow forgot to check the last page, where i should include the x15 connector somehow.xD
Running on MS3

Last edited by kris5150; Aug 18, 2015 at 02:15 PM.
Old Aug 18, 2015 | 09:01 PM
  #195  
ThunderFox's Avatar
Junior Member
 
Joined: Mar 2012
Posts: 200
Total Cats: -12
From: Portugal
Default

No NAs or NBs ever had sequential ignition. They're all wasted spark.

Just mounting the coils as they were on the original engine will do. Mind, you'll have to modify the cable boots or the cam cover for them to fit.

Also, did you try to fit the 01+ coils with the ignitor in place? That would cause them to burn
Old Aug 19, 2015 | 05:05 AM
  #196  
kris5150's Avatar
Newb
 
Joined: Aug 2015
Posts: 16
Total Cats: 0
From: Slovenia
Default

Sorry i meant sequential injection, but dont think that would make a difference
Great thats what i wanted to hear. What do you mean by modifying? cables fit with no problem!?
Nope, i deleted the ignitor and ran new wires to the coils, but forgot to wire them to the condenser at the back of the head.

I did it like this...


but sould do it like this i guess...



btw, is the case/metal housing of the 1.6 coil ground for itself, or can it be mouted to non chasies/engine bracket?

Attached Thumbnails The Definitive "VVT swap into 90-97 chassis" Megathread.-80-73251_my_vvt_swap_attempt_little_different_because_1_6_1996_euro_car_coil_adapter_harness_1_6.jpg   The Definitive "VVT swap into 90-97 chassis" Megathread.-80-87808_my_vvt_swap_attempt_little_different_because_1_6_1996_euro_car_coil_adapter_harness_1_6.jpg  
Old Aug 19, 2015 | 05:18 AM
  #197  
ThunderFox's Avatar
Junior Member
 
Joined: Mar 2012
Posts: 200
Total Cats: -12
From: Portugal
Default

I did not wire mine to the condenser behind the engine. Actually I got rid of it and they worked pretty fine. What dwell time were you running on them?

Also, the case is grounded, only the VVT coils have their own ground IIRC.
Old Aug 19, 2015 | 06:00 AM
  #198  
kris5150's Avatar
Newb
 
Joined: Aug 2015
Posts: 16
Total Cats: 0
From: Slovenia
Default

Interesting, i tought that was the problem..
Cant tell..i fry them before even logging into tunerstudio
Old Aug 19, 2015 | 06:02 AM
  #199  
ThunderFox's Avatar
Junior Member
 
Joined: Mar 2012
Posts: 200
Total Cats: -12
From: Portugal
Default

Did you try to load new firmware into the ECU without disconnecting them first?
Old Aug 19, 2015 | 07:13 AM
  #200  
kris5150's Avatar
Newb
 
Joined: Aug 2015
Posts: 16
Total Cats: 0
From: Slovenia
Default

Nope nothing, i just connected everything, including the battery, give the contact and there was that big cloud of smoke coming from the coils



All times are GMT -4. The time now is 08:04 PM.