FI 1.6 or NA 1.8? - Miata Turbo Forum - Boost cars, acquire cats.

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

FI 1.6 or NA 1.8?

Old 06-01-2011, 08:15 AM
  #1  
Newb
Thread Starter
 
Join Date: May 2011
Location: montreal, canada
Posts: 9
Total Cats: 0
Default FI 1.6 or NA 1.8?

I'm trying to decide if it's better for me to build a turbocharged 1.6, or perform a full 1.8 swap (incl subframes, brakes, suspension) on to my '91 shell.

Does the 1.8 engine weigh more than the 1.6? Was all of the additional weight on the later cars added to the shell?

The 1.8 was shipped with 133 hp ('97) and it would take 5 psi of boost to get that out of the 1.6... it seems to me the swap up to a 1.8 is the smarter choice.

What do you think?
john.m is offline  
Old 06-01-2011, 02:59 PM
  #2  
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,085
Total Cats: 367
Default

It's never a bad idea to add displacement. I'd only run a 1.6 if you don't go north of 230whp on the track.
hustler is offline  
Old 06-01-2011, 03:04 PM
  #3  
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 75,089
Total Cats: 2,114
Default

it would take less than 5psi. I was hitting 170rwhp at 6psi.

with that said, I'd take the 1.8L motor, chasis and upgrades over the 90-93 anyday.
Braineack is offline  
Old 06-01-2011, 03:08 PM
  #4  
Elite Member
iTrader: (13)
 
Join Date: Dec 2009
Location: Fraser Valley, British Columbia
Posts: 2,495
Total Cats: 13
Default

Depends on your budget. The 1.6L can take boost quite easily. I was boosting 9-10PSI last year on a tired 1.6L and made just under 200whp. The car was pretty damn fast for only having invested about $1200 in the kit (used GReddy + FMIC, MS1). This year I am running a built 1.7L and a Rotrex. I've driven a 1.8 turbo and if there is one thing the 1.6L likes, it's to be revved. It's a very rev happy motor (especially with the head work I have done). If you can afford a 1.8L swap AND a turbo kit then do that... but if you just want to go fast for cheap, throw a used BEGi manifold/dp on it (easiest to find used), a ebay T25/28, injectors, fab up your own IC and run a megasquirt.

And don't mistake 133hp with 133whp :P. 5PSI on a 1.6L with decent compression will get you in the 155-165whp ish mark. Up that to 10PSI and you have 200whp give or take. That's not even pushing what the block can handle.
falcon is offline  
Old 06-01-2011, 03:24 PM
  #5  
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 75,089
Total Cats: 2,114
Default

I'd rather have a motor that makes boost faster and outputs more torque per psi than the placebo effect of the 1.6L that it revvs better.
Braineack is offline  
Old 06-01-2011, 03:33 PM
  #6  
Junior Member
 
Join Date: Mar 2011
Location: Tallahassee, FL
Posts: 277
Total Cats: 3
Default

1.8L ftw.

Like brain said, it'll make boost faster, have more tq and be and all around better motor to boost.
spitefulcheerio is offline  
Old 06-01-2011, 03:34 PM
  #7  
Elite Member
iTrader: (13)
 
Join Date: Dec 2009
Location: Fraser Valley, British Columbia
Posts: 2,495
Total Cats: 13
Default

I agree. But I was just saying if he only has the money to either turbo the 1.6 or put an NA 1.8 in, you will get more for your money and more power turboing the 1.6.
falcon is offline  
Old 06-01-2011, 03:38 PM
  #8  
Junior Member
 
Join Date: Mar 2011
Location: Tallahassee, FL
Posts: 277
Total Cats: 3
Default

Originally Posted by falcon View Post
I agree. But I was just saying if he only has the money to either turbo the 1.6 or put an NA 1.8 in, you will get more for your money and more power turboing the 1.6.
Now this is true. I'll have to agree with this.

But if you're willing to live with an NA 1.8 for a little while till you can save up for a turbo kit, I'd do that
spitefulcheerio is offline  
Old 06-01-2011, 04:10 PM
  #9  
Elite Member
iTrader: (13)
 
Join Date: Dec 2009
Location: Fraser Valley, British Columbia
Posts: 2,495
Total Cats: 13
Default

Or he can do things completely backwards like I did and build a 1.6L motor and swap it into an NA8. :P
falcon is offline  
Old 06-01-2011, 11:29 PM
  #10  
Newb
Thread Starter
 
Join Date: May 2011
Location: montreal, canada
Posts: 9
Total Cats: 0
Default

I have the budget for both.

I can tell that you guys are almost completely unanimous for the 1.8 build. Me too.

Why can't the 1.8 be as revvy as the 1.6? I've read it just needs a 1.6 flywheel. I would imagine a good set of cams might change the power curve too, no?
john.m is offline  
Old 06-02-2011, 09:33 AM
  #11  
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 75,089
Total Cats: 2,114
Default

They are just as revvy. The placebo effect is the car shaking apart as you slowly accelerate to 40 mph.

It's just a thing the m.net foagies use to pretend they are still relevant with their <20K orginial miles 90-93 cars.
Braineack is offline  
Old 06-02-2011, 12:30 PM
  #12  
Elite Member
iTrader: (11)
 
chicksdigmiatas's Avatar
 
Join Date: Apr 2008
Location: Texas, 'Murica
Posts: 2,485
Total Cats: 6
Default

Originally Posted by Braineack View Post
They are just as revvy. The placebo effect is the car shaking apart as you slowly accelerate to 40 mph.

It's just a thing the m.net foagies use to pretend they are still relevant with their <20K orginial miles 90-93 cars.

Everytime I read about "reviness" (SP?) or throttle response I want to punch babies. My car gets to 0 psi as fast as theirs does.
chicksdigmiatas is offline  
Old 06-02-2011, 12:32 PM
  #13  
VladiTuned
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 35,054
Total Cats: 3,105
Default

twin 35r ls1 or bust.
you'll make 500whp on 2psi
18psi is offline  
Old 06-02-2011, 12:35 PM
  #14  
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 75,089
Total Cats: 2,114
Default

Originally Posted by chicksdigmiatas View Post
Everytime I read about "reviness" (SP?) or throttle response I want to punch babies. My car gets to 0 psi as fast as theirs does.
Everytime I drive a 1.8L motor I'd glady give up the "revviness" of my 1.6L for the extra power, bracing, braking power, clutch clamping force, and torsen rear.

Once you FI the car, the "revving" factor is thrown out the window. I'll take faster spool and greater output anyday. Plus, all the above mentioned tend to get upgraded to the 1.8L counterparts eventually.
Braineack is offline  
Old 06-12-2011, 11:59 PM
  #15  
Newb
 
Join Date: Jan 2011
Posts: 42
Total Cats: 0
Default

Originally Posted by Braineack View Post
Everytime I drive a 1.8L motor I'd glady give up the "revviness" of my 1.6L for the extra power, bracing, braking power, clutch clamping force, and torsen rear.

Once you FI the car, the "revving" factor is thrown out the window. I'll take faster spool and greater output anyday. Plus, all the above mentioned tend to get upgraded to the 1.8L counterparts eventually.
your motor has a torsen? And bracing? I've been missing out.
Terrh is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Quinn
Cars for sale/trade
6
10-23-2016 08:58 AM
JxPhan
Meet and Greet
3
10-02-2015 03:17 AM
Trent
WTB
2
10-01-2015 01:15 PM
JesseTheNoob
DIY Turbo Discussion
15
09-30-2015 03:44 PM


Thread Tools
Search this Thread
Quick Reply: FI 1.6 or NA 1.8?


Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.