Slowest turbo Miata ever - Page 22 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Build Threads Building a motor? Post the progress here.

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 12-23-2013, 05:15 PM   #421
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 34,442
Total Cats: 2,259
Default

01 clutch chatter is a known problem
as for the vvt, are you talking about when the car is warming up? because that's the vtcs butterflies
18psi is offline   Reply With Quote
Old 12-23-2013, 05:27 PM   #422
Elite Member
Thread Starter
iTrader: (5)
 
Erat's Avatar
 
Join Date: Oct 2011
Location: Detroit
Posts: 4,035
Total Cats: 247
Default

Quote:
Originally Posted by 18psi View Post
01 clutch chatter is a known problem
as for the vvt, are you talking about when the car is warming up? because that's the vtcs butterflies
Warming up during acceleration. You're probably right, i totally over looked the vtcs butterflies.
Erat is offline   Reply With Quote
Old 12-30-2013, 10:09 PM   #423
Senior Member
iTrader: (2)
 
williams805's Avatar
 
Join Date: Oct 2013
Location: Goleta, Southern California
Posts: 502
Total Cats: 25
Default

Quote:
Originally Posted by miata2fast View Post
I am having a hard time understanding why he would port the floor of the intake runner. I was always taught that you never do that. Not saying that what he did is wrong or that it will not work better, but it is different than what I know.

Were you able to get any before and after flow data?
Quote:
Originally Posted by Erat View Post
Because it's the shortest distance into the cylinder, among other things. Why hog out material on the top when air being forced in, or sucked in won't want to go up that way? The exhaust side is opposite. The top of the port was ported out more because of the way exhaust gasses will be flowing up.

I didn't get any flow data because the flow bench he uses doesn't sell the adapter small enough for the bp ports or something.

Either way, it spools quicker and makes more HP than it did before on wastegate.
Quote:
Originally Posted by miata2fast View Post
Cutting into the floor causes the airflow to take a more abrupt turn before entering into the valve seat area. The reason the 99+ head works so much better is because the runner has been raised creating a straighter shot.

The fact that the runner is larger and smoother will probably make more power, but it is not likely to be maximized by cutting the floor.

I am not hating, just be mindful of that in the future. If you find that you want to further develop your head, you could epoxy the floor and re-port it. It is what everyone use to do when there were no heads available with raised runners.
I ran across this picture kind of randomly and could see why conceivably taking some off the floor of the earlier head might work. Also why that would not work for the later head. I have no real science to back this up, just looks like a straighter shot to the valve opening if you took that last corner off the bottom of the early head. Especially on the exhaust.
Attached Thumbnails
Slowest turbo Miata ever-1ba40239-8250-4766-a838-b91e2261a920.jpg  
williams805 is offline   Reply With Quote
Old 12-30-2013, 11:55 PM   #424
Elite Member
iTrader: (2)
 
miata2fast's Avatar
 
Join Date: Aug 2009
Location: Dover, FL
Posts: 2,866
Total Cats: 99
Default

Your logic is based on the fact that it is a shorter distance to one side of the valve. What about the other side? Do you see the abrupt angle the air has to turn to enter the earlier head? You make it worse by cutting the floor.

Changing the valve angle and or raising the port is what creates equal pressure all around the edge of the valve as it enters the cylinder.

It's head porting 101.
miata2fast is offline   Reply With Quote
Old 12-31-2013, 12:13 AM   #425
I take big bites
iTrader: (1)
 
turbofan's Avatar
 
Join Date: Sep 2010
Location: Hurricane, UT
Posts: 6,439
Total Cats: 470
Default

^i certainly will not argue with this guy.
turbofan is offline   Reply With Quote
Old 12-31-2013, 09:04 PM   #426
Elite Member
Thread Starter
iTrader: (5)
 
Erat's Avatar
 
Join Date: Oct 2011
Location: Detroit
Posts: 4,035
Total Cats: 247
Default

Well. I posted my dyno numbers, with my **** tune, and the .msq with all my variables.

I don't have any flow bench numbers to put out there. Take it how you will.
Erat is offline   Reply With Quote
Old 01-01-2014, 05:37 PM   #427
Moderator
iTrader: (11)
 
sixshooter's Avatar
 
Join Date: Nov 2008
Location: Tampa, Florida
Posts: 14,405
Total Cats: 1,259
Default

Yeah, the only place on the bottom of the runner you would want to port is the short side radius on the earlier head. You would do this to make the short side curve less dramatic and a bit straighter. Notice the later head has a much less pronounced short side turn due to superior port angle. There is much less work to be done there on the newer head.
sixshooter is online now   Reply With Quote
Old 01-02-2014, 03:06 PM   #428
Elite Member
Thread Starter
iTrader: (5)
 
Erat's Avatar
 
Join Date: Oct 2011
Location: Detroit
Posts: 4,035
Total Cats: 247
Default

My engine builder made it in this Magazines top 16 engine builders of 2013.

The 2013 Performance Engine Builder of the Year Contest Reaches

Second one down. Besnik Engine Design, Center Line, MI.
Erat is offline   Reply With Quote
Old 01-02-2014, 03:59 PM   #429
Elite Member
iTrader: (2)
 
miata2fast's Avatar
 
Join Date: Aug 2009
Location: Dover, FL
Posts: 2,866
Total Cats: 99
Default

Quote:
Originally Posted by Erat View Post
My engine builder made it in this Magazines top 16 engine builders of 2013.

The 2013 Performance Engine Builder of the Year Contest Reaches

Second one down. Besnik Engine Design, Center Line, MI.

Pretty hard to argue with that. I think the description of the port job you posted on the intake side is somewhat incomplete.


I have spent some time looking at the port pictures since this was brought back up. My guess is he ported the floor at the edge of the runner closest to the intake manifold, and ramped it up to about the stock level at about the middle of the runner to create a slight curve further upstream.


On the roof, my guess the beginning of the runner was kept close to stock right at the intake manifold, and further downstream the roof was ported in order to match the floor profile, and to have a more gradual bend towards the face of the valve.
miata2fast is offline   Reply With Quote
Old 01-03-2014, 12:33 PM   #430
I take big bites
iTrader: (1)
 
turbofan's Avatar
 
Join Date: Sep 2010
Location: Hurricane, UT
Posts: 6,439
Total Cats: 470
Default

I mean, I think he's right about the true, best way to do porting.

However... your numbers are STRONG. It's mostly because of your car/your build that I feel good going with an FM2 no electronics kit for my turbo build this year. (at least for now... hehe)

I loved how your exhaust sounded, how the turbo spooled, and just overall the way the car felt, even if I only felt it from the passenger seat.

Note: this post was written like 3 days ago. Still wanted to share all the same because I love how your car felt and sounded and I want to copy it in a clean NB2.
turbofan is offline   Reply With Quote
Old 01-12-2014, 03:29 PM   #431
Elite Member
Thread Starter
iTrader: (5)
 
Erat's Avatar
 
Join Date: Oct 2011
Location: Detroit
Posts: 4,035
Total Cats: 247
Default

Diary update.
You don't get very many dry road sunny Sundays in January here in Michigan. So when you do, you have to take advantage of them.


Hooked an old battery up to the NA, put the key in, primed the fuel system, and turned it over. She fired to life immediately first try. Ran on 3 cylinders for about 4 seconds then proceeded to purr away.
Keeping it in a climate control garage i'm sure helped a little.

Couldn't help but take it for a spin. I totally forgot how much of a monster this car is. It is so much different than the NB. To spare you from the boring details, i'll sum it up by saying it's simply more raw.
Not to mention the endless wheelspin and actual power.



Even went ahead and fired up the bike. Like a typical Honda, it did it with no fuss.


I am not going out for a ride, even though, it's sooooo tempting.
Attached Thumbnails
Slowest turbo Miata ever-image01122014143225.jpg   Slowest turbo Miata ever-image01122014144428.jpg   Slowest turbo Miata ever-image01122014144735.jpg  
Erat is offline   Reply With Quote
Old 01-13-2014, 10:13 AM   #432
Elite Member
iTrader: (4)
 
Join Date: Sep 2006
Location: Charlotte, NC
Posts: 2,929
Total Cats: 0
Default

Same here in Ohio, not many days in January and February to get out and drive/ride.

I made use of the nice weather and finally got around to finish my roll-bar install.
Efini~FC3S is offline   Reply With Quote
Old 01-13-2014, 11:39 AM   #433
Destroyer of Inconel
iTrader: (37)
 
EO2K's Avatar
 
Join Date: Apr 2010
Location: In ur driveway, abusin' ur WPA
Posts: 9,261
Total Cats: 870
Default

Quote:
Originally Posted by Erat View Post
It is so much different than the NB. To spare you from the boring details, i'll sum it up by saying it's simply more raw.
Having owned both, this is exactly how I describe the NA to people who have NBs. I kinda miss it actually.
EO2K is offline   Reply With Quote
Old 01-13-2014, 12:07 PM   #434
Elite Member
iTrader: (12)
 
Join Date: Dec 2006
Location: Taos, New mexico
Posts: 5,678
Total Cats: 230
Default

Nice man. Would you agree with the statement, NB is a better car, NA is a better miata? Or whatever I've always heard people say.

Seems like NB would be the ticket for a DD, but NA for a toy/track car. Just speculation, i only drove a NB once and it was on horrible coils with a cut off exhaust. it felt okay, but my NA with AGX (read:terrible) suspension rode 100x better.
Fireindc is offline   Reply With Quote
Old 01-13-2014, 12:24 PM   #435
Elite Member
 
Join Date: Jul 2007
Location: Little Rock, AR
Posts: 3,095
Total Cats: 121
Default

An NB is a better DD and Track car. The NA is the best "fun" car. I will agree that it feels more raw, very similar to an old British car but reliable.
jacob300zx is offline   Reply With Quote
Old 01-13-2014, 12:57 PM   #436
Destroyer of Inconel
iTrader: (37)
 
EO2K's Avatar
 
Join Date: Apr 2010
Location: In ur driveway, abusin' ur WPA
Posts: 9,261
Total Cats: 870
Default

Quote:
Originally Posted by jacob300zx View Post
I will agree that it feels more raw, very similar to an old British car but reliable.
+1. Riding around in my Dad's TR6 for most of my youth convinced me to buy a 2 seat convertible, and convinced me not to buy a british car
EO2K is offline   Reply With Quote
Old 01-13-2014, 03:44 PM   #437
Senior Member
iTrader: (5)
 
Join Date: May 2011
Location: London,OH
Posts: 1,125
Total Cats: 13
Default

Next time I'm up at my dads when its warm i want to take a ride in the red car. I meant to ask when we were working on mine.
redturbomiata is offline   Reply With Quote
Old 01-13-2014, 06:34 PM   #438
Elite Member
Thread Starter
iTrader: (5)
 
Erat's Avatar
 
Join Date: Oct 2011
Location: Detroit
Posts: 4,035
Total Cats: 247
Default

Quote:
Originally Posted by redturbomiata View Post
Next time I'm up at my dads when its warm i want to take a ride in the red car. I meant to ask when we were working on mine.
I can't remember why you didn't go for a ride, it was right out front. lol


Edit* NB clutch chatter is REALLLLYYY getting annoying.
Also, it seems like it's getting a random single missfire, perhaps factory spark unit? Oh well, i'll live with it.
NB key is chipped? Ugh, lame...
Erat is offline   Reply With Quote
Old 01-13-2014, 08:07 PM   #439
Senior Member
iTrader: (5)
 
Join Date: May 2011
Location: London,OH
Posts: 1,125
Total Cats: 13
Default

That was the day I slit my arm open pretty good on that damn spring clamp. I got a good scar from that lol
redturbomiata is offline   Reply With Quote
Old 01-14-2014, 07:12 AM   #440
Hear me Meow
iTrader: (3)
 
skidude's Avatar
 
Join Date: Apr 2008
Location: Outside Portland Maine
Posts: 1,982
Total Cats: 11
Default

Quote:
Originally Posted by Erat View Post
Edit* NB clutch chatter is REALLLLYYY getting annoying.
...
NB key is chipped? Ugh, lame...
I remember being annoyed by both of those things when I switched from my '94 to my '02. If you slip the clutch a little extra it will sometimes fix the chatter for a little while. It will come back, though. I switched to megasquirt and an FM clutch, and then completely forgot about the chatter.
skidude is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Turbo 1995 Miata Low mileage Clean Tekel Cars for sale/trade 29 02-05-2016 04:16 PM
New here, saying hi, here's what I'm workin with. SuperSneakySecretSquirrel Meet and Greet 5 09-06-2015 08:30 PM
2009 Subaru WRX Hatchback - Pearl White - 83k miles - $16999 Braineack Cars for sale/trade 3 09-04-2015 02:12 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 08:29 PM.