N/A 1.8 VVT build advice - 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.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 03-08-2014, 10:46 PM   #1
Senior Member
Thread Starter
iTrader: (3)
 
Join Date: Nov 2011
Location: Beaverton, OR
Posts: 737
Total Cats: 30
Default N/A 1.8 VVT build advice

hey guys,
I got the great fortune of receiving a NB2 VVT motor that is in need of a rebuild due to some wonderful rod knock from Doppelgangers car. I plan to eventually swap the motor into my 1.6 Project Lazarus.
https://www.miataturbo.net/build-thr...nothing-75005/
Im not asking to be spoonfed, but the purpose behind the car is to have a cheap reliable track rat, thus I do not want to spend an excessive amount of money on rebuilding the motor, I will obviously replace everything that is necessary, but Im wondering if it would be worth keeping the VVT head. My car currently has as a MS PNP, and I know I would need the VVT tuner to properly run the VVT which is an additional 200 I dont want to spend. Ive done some research and it looks like the general consensus is that the VVT head does not like to rev particullarly highin abusive conditions such as HPDE and time trials.

I guess my question is would it be worth switching to a non VVT NB1 head for the sake of reliability vs keeping the VVT at additional cost and potentially a better powerband. I have no plans on going with a squaretop manifold or anything of that nature, the car will have full exhaust and an intake and other than that is stock. Currently the 1.6 that is in there makes 115 whp and Im looking to get a reliable 140 whp, anything above that would be a plus. The car gets driven hard and racks up a pretty decent amount of track miles.

So to sum it up, is there anything that you folks would suggest upgrading while the motor is apart in order to promote longevity and potentially increase performance, and if the VVT is a worthwhile asset to keep or not.
greddygalant is offline   Reply With Quote
Old 03-10-2014, 09:47 AM   #2
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 9,093
Total Cats: 90
Default

Yes the VVT head is worth it. And the NB1 head swap is going to cost more than a VVT tuner because people still think VVT heads are fragile and/or hard to swap.
Leafy is offline   Reply With Quote
Old 03-10-2014, 09:59 AM   #3
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,107
Total Cats: 518
Default

If you concerned about longevity, you wouldn't ever see 8k on the tach.

None of our motors enjoy like to rev particularly high in abusive conditions, you're just lucky you haven't grenaded anything yet.

I still say rebuild the VVT and swap it in. By the time you sell or part out the 1.6, I bet you won't be too far in the hole.
curly is offline   Reply With Quote
Old 03-12-2014, 03:21 PM   #4
Elite Member
iTrader: (6)
 
blaen99's Avatar
 
Join Date: Sep 2010
Location: Seattle, WA
Posts: 4,112
Total Cats: 27
Default

Quote:
Originally Posted by curly View Post
If you concerned about longevity, you wouldn't ever see 8k on the tach.

None of our motors enjoy like to rev particularly high in abusive conditions, you're just lucky you haven't grenaded anything yet.

I still say rebuild the VVT and swap it in. By the time you sell or part out the 1.6, I bet you won't be too far in the hole.
Curly,

Do you mean in stock form? Or even with a balanced, forged rods, and springs at 8k?
blaen99 is offline   Reply With Quote
Old 03-12-2014, 03:33 PM   #5
mkturbo.com
iTrader: (24)
 
shuiend's Avatar
 
Join Date: May 2006
Location: Charleston SC
Posts: 13,778
Total Cats: 1,106
Default

I would absolutely keep the VVT head and make sure you throw in forged rods to be on the safe side. VVT tuner is not needed to get the car running. So if the $200 is to much up front, wait a bit and drive the car without VVT. Honestly I would recommend moving up from a MSPNP to an MS3X of some sort over buying a VVT tuner. While it it more expensive, the MS3 is so much better then the MS1.
shuiend is offline   Reply With Quote
Old 03-12-2014, 04:25 PM   #6
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,107
Total Cats: 518
Default

Hmm, VVT or MCS...
curly is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1994 Spec Miata Race Car SM/SM2/SSM For Sale Quinn Cars for sale/trade 6 10-23-2016 08:58 AM
WTB MP62 (Hotside) (NB2) Rick02R WTB 3 01-03-2016 08:18 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
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


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 Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 03:39 AM.