The Definitive "VVT swap into 90-97 chassis" Megathread. - Page 12 - Miata Turbo Forum -Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Engine Performance This section is for discussion on all engine building related questions. KMiata

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 09-16-2015, 12:35 PM   #221
Senior Member
iTrader: (3)
 
Join Date: Sep 2011
Location: Plano TX
Posts: 585
Total Cats: 2
Default

I have a questions about coolant hoses and which coolant necks to use.

So I did this swap in 2012 and she was running until the oil drain loosened and trashed the engine. Well 3 years later I am getting her going again. Hard lesson learned about tightening down drain plug.

So anyway my question is
I initial used the 1.6 front coolant/thermostat neck and the 1.6 driverside front coolant neck.


My 1.6 had an old Begi partial reroute that brought the heater core output back to the radiator hose that connects betweeen the thermostat housing and the radiator. So I don't need the heater core return line included in the 01-05 drivers side coolant neck.

But the 1.6 drivers side coolant neck requires a tight squeeze on the radiator hose coming from the bottom of the rad. Could I use the 01-05 driverside coolant neck and block the heater core return. Or should I just keep it the way I did it the first time with 1.6 front coolant necks.

Also any reason to keep 01-05 neck on thermostat neck? the 1.6 one clears my BOV better.

What about the rear neck 01-05 or 1.6 neck?
90 Turbo is offline   Reply With Quote
Old 09-16-2015, 12:38 PM   #222
Junior Member
 
Join Date: Mar 2012
Location: Portugal
Posts: 191
Total Cats: -11
Default

I used everything off the VVT on mine... There are ports in the engine, so just removed whatever is fitted there (one sensor and one bung) and fitted those from the original engine. Left the rest unmodded.

If you still feel like replacing those parts, it should make no difference.
ThunderFox is offline   Reply With Quote
Old 09-16-2015, 03:50 PM   #223
Senior Member
iTrader: (3)
 
Join Date: Sep 2011
Location: Plano TX
Posts: 585
Total Cats: 2
Default

Also I was wondering and maybe it would help other too if it's here.

What firmware/software changes are required in the ECU when you change from the CAS and stock earlier coil/igniter to the VVT Coils with built in igniter?

"all of the other changes necessary will happen in the firmware/software of your ECU. "
90 Turbo is offline   Reply With Quote
Old 09-16-2015, 04:05 PM   #224
Junior Member
 
Join Date: Mar 2012
Location: Portugal
Posts: 191
Total Cats: -11
Default

I'm still using CAS on mine, so no changes there. the CAS is either optical or hall. The optical simulates a hall signal anyway.

As for the VVT COPs, they do have an ignitor built into them. You have to bypass the ignitor ALWAYS, as stated in the first post of this thread. All you have to do afterwards is set the dwell time, as the 1.6 at least uses a 5ms dwell. mine are currently running happily at 4ms dwell time.

By losing the ignitor which generates RPM signal to the gauge cluster, you will lose the rev meter as well. You can modify the MS (if it doesn't already have it) to output the tacho output in the wire that goes to the ignitor, and loop that one too (as per the initial post). But not all MS will support that out-of-the-box.
ThunderFox is offline   Reply With Quote
Old 09-17-2015, 04:34 PM   #225
Senior Member
iTrader: (3)
 
Join Date: Sep 2011
Location: Plano TX
Posts: 585
Total Cats: 2
Default

To keep 01-05 driversside coolant neck do you just change to a 01-05 lower radiator hose? Will it interfere with the turbo and pipings?
A pic of it installed please.
90 Turbo is offline   Reply With Quote
Old 09-17-2015, 05:12 PM   #226
Junior Member
 
Join Date: Mar 2012
Location: Portugal
Posts: 191
Total Cats: -11
Default

Didn't change a thing. The original hose just fits normally on the waterpump neck.

Be sure to clean the surface very well as I had to disassemble it 4 times as it was leaking due to rough surface.
ThunderFox is offline   Reply With Quote
Old 09-17-2015, 05:20 PM   #227
Senior Member
iTrader: (3)
 
Join Date: Sep 2011
Location: Plano TX
Posts: 585
Total Cats: 2
Default

With my early Begi garret turbo system the 1.6 hose comes out the front of the engine between the ac pulley and pw steering pulley. Which neck did turbo guys use? Any pics?
90 Turbo is offline   Reply With Quote
Old 10-08-2015, 09:48 PM   #228
Senior Member
 
Join Date: Nov 2010
Location: Pittsburgh PA
Posts: 1,172
Total Cats: 13
Default

Dumb question.

The guide says to use an NB throttle cable. I'm swapping in a 2003 (NB) motor, with a 99 (NB) manifold, but retaining my 94 (NA) throttle body (94 chassis).

While my gut tells me the NA cable that matches my throttle body is the one to use, Sav is obviously much more knowledgeable than my gut.



I ***ume the recommendation for an NB throttle cable only applies if one is using an NB throttle body?
2ndGearRubber is offline   Reply With Quote
Old 10-08-2015, 09:51 PM   #229
Junior Member
 
Join Date: Mar 2012
Location: Portugal
Posts: 191
Total Cats: -11
Default

It's for all cases I think. The issue with the throttle cable is that it's longer in the NA than in the NB, from the sleeve end to the TB spindle. And this is affected by the bracket that is mounted on the manifold.

To be fair, I just fabbed a new bracket and was done with it. Couldn't be arsed swapping the throttle cable. If and when it goes, I'll swap it.
ThunderFox is offline   Reply With Quote
Old 10-09-2015, 09:11 PM   #230
Senior Member
 
Join Date: Nov 2010
Location: Pittsburgh PA
Posts: 1,172
Total Cats: 13
Default

Ghetto temporary bracket can be fabbed. Thanks.
2ndGearRubber is offline   Reply With Quote
Old 10-10-2015, 03:16 AM   #231
Supporting Vendor
Thread Starter
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 13,359
Total Cats: 807
Default

Ghetto temporary bracket that breaks < OEM throttle cable installed and used as designed
Savington is offline   Reply With Quote
Old 10-10-2015, 07:48 AM   #232
Junior Member
 
Join Date: Mar 2012
Location: Portugal
Posts: 191
Total Cats: -11
Default

Maybe I mentioned it wrong, but I don't expect the bracket to go. I was saying, when the cable goes, I'll replace it. Pretty sure the bracket I made is more resistant than the OEM one, as I merely extended the NA OEM bracket to fit the NB manifold position.
ThunderFox is offline   Reply With Quote
Old 10-11-2015, 10:07 PM   #233
Senior Member
iTrader: (3)
 
Join Date: Sep 2011
Location: Plano TX
Posts: 585
Total Cats: 2
Default

In my 90 with vvt I used a bracket from flying miata and the na cable. Seems to work fine I guess the cable is a little long but theirs plenty of room for the bigger cable it doesn't bend sharply at all. Looks stock.
Thou the bracket is unpainted but the welds are kind of pretty.

Last edited by 90 Turbo; 10-11-2015 at 10:23 PM.
90 Turbo is offline   Reply With Quote
Old 10-15-2015, 11:51 AM   #234
mkturbo.com
iTrader: (24)
 
shuiend's Avatar
 
Join Date: May 2006
Location: Charleston SC
Posts: 12,184
Total Cats: 748
Default

Does the NB2 header fit into a NA chassis fine? I will be building a 2.5" for the rest of the exhaust so I am not worried about the flange being off. Long term I am planning on switching to a RB header. Any difference in power between the NA and NB ones?
shuiend is offline   Reply With Quote
Old 10-15-2015, 12:41 PM   #235
Supporting Vendor
Thread Starter
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 13,359
Total Cats: 807
Default

I've never tried, but I would imagine it fits just fine. The NB2 header is substantially better than the NB1/NA8 headers.
Savington is offline   Reply With Quote
Old 10-15-2015, 12:43 PM   #236
Senior Member
 
Join Date: Sep 2013
Posts: 899
Total Cats: 57
Default

So good that you can basically fund an RB header by selling it on eBay (seriously, $275-300+ all day).
Dunning Kruger Affect is offline   Reply With Quote
Old 10-15-2015, 02:40 PM   #237
mkturbo.com
iTrader: (24)
 
shuiend's Avatar
 
Join Date: May 2006
Location: Charleston SC
Posts: 12,184
Total Cats: 748
Default

Quote:
Originally Posted by Savington View Post
I've never tried, but I would imagine it fits just fine. The NB2 header is substantially better than the NB1/NA8 headers.
The spare VVT motor I am picking up comes with the NB2 header. It is a large reason I am buying the motor. Don't have a car for the motor, but having spares sitting around can't be bad.

Quote:
Originally Posted by Dunning Kruger Affect View Post
So good that you can basically fund an RB header by selling it on eBay (seriously, $275-300+ all day).
It is silly how much the NB2 headers go for. I am also surprised by how well used RB headers hold their value.
shuiend is offline   Reply With Quote
Old 10-15-2015, 02:41 PM   #238
SadFab Sales Lady
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 14,783
Total Cats: 930
Default

Wtf? I could barely sell mine at 125.
aidandj is offline   Reply With Quote
Old 10-15-2015, 02:44 PM   #239
Junior Member
 
Join Date: Mar 2012
Location: Portugal
Posts: 191
Total Cats: -11
Default

I have an NB2 header gathering dust at home. Couldn't be arsed adapting it with the rest of the swap when the car is eventually going to get a new one.
ThunderFox is offline   Reply With Quote
Old 10-15-2015, 02:49 PM   #240
Destroyer of Inconel
iTrader: (37)
 
EO2K's Avatar
 
Join Date: Apr 2010
Location: In ur driveway, abusin' ur WPA
Posts: 8,732
Total Cats: 746
Default

I have both, lolwut?

The big market for the NB2 header is CA guys who are stuck with the cast iron BP4W manifolds, but they need to be complete with heatshields and EGR tube. For obvious reasons.

As for the NB RB in a NA chassis, didn't Hustler do this when he went back to N/A on the Green Glory Hole? I feel like he had to dent one of the primaries to get it to not whack the steering shaft, but I may be getting that cornfused with someone/something else.
EO2K is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
WTB MP62 (Hotside) (NB2) Rick02R WTB 3 01-03-2016 08:18 PM
Noob to Miataturbo from MA JxPhan Meet and Greet 3 10-02-2015 03:17 AM
Low oil pressure after 1.8 swap and new turbo setup JesseTheNoob DIY Turbo Discussion 15 09-30-2015 03:44 PM
VR6 to Miata Swap ScrapinMX5 Meet and Greet 8 09-28-2015 02:04 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 05:39 AM.