Could it be in the tune? - Page 2 - 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 05-06-2016, 07:08 AM   #21
Newb
Thread Starter
 
Join Date: May 2016
Posts: 13
Total Cats: 0
Default

Quote:
Originally Posted by ryansmoneypit View Post
Rear Sport brakes offer a poor pad selection.
I'm using carbotech ax6. Wasn't aware of any pad selection issues, but then again, all I'm after is a better bias.
Terrible01 is offline   Reply With Quote
Old 11-14-2016, 04:04 PM   #22
Newb
Thread Starter
 
Join Date: May 2016
Posts: 13
Total Cats: 0
Default

So I've ran the car at five or more auto cross events. I have added a larger rear brake set up and 275 Hoosiers on 15x10's. The car feels great and have even set FTD at a couple.

But now I'm getting to where I know I need more power and a higher redline. So I decided to revive an old thread and get some input from you guys.

I was thinking of swapping the head to VVT and purchasing a better oil pump, crank dampener, and higher compression pistons to go along with it. Since I want to rev it to the neighborhood of 8-9k, I'm wanting to be on the safe side and also have the head built. 949racing sells a cnc'd head that I believe will be reliable.

You can see what's done to the car in this thread. I'd love to hear some feedback because I'm sure I'm forgetting something or maybe there is a better way.
Terrible01 is offline   Reply With Quote
Old 11-15-2016, 01:02 PM   #23
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,365
Total Cats: 1,326
Default

9k will result in an intimate analysis of the grain structure internal to the crankshaft
Savington is offline   Reply With Quote
Old 11-15-2016, 02:01 PM   #24
Moderator
iTrader: (11)
 
sixshooter's Avatar
 
Join Date: Nov 2008
Location: Tampa, Florida
Posts: 15,669
Total Cats: 1,561
Default

^This.

But the idea of a 949 head is a good one.

140whp is good for the early 1.8. They were rated at 133 crank hp fro the factory and often make 120 or less at the wheels.
sixshooter is offline   Reply With Quote
Old 11-15-2016, 03:38 PM   #25
Newb
Thread Starter
 
Join Date: May 2016
Posts: 13
Total Cats: 0
Default

Quote:
Originally Posted by sixshooter View Post
^This.

But the idea of a 949 head is a good one.

140whp is good for the early 1.8. They were rated at 133 crank hp fro the factory and often make 120 or less at the wheels.
I agree that the crank is a weak point, although I can't recall the rpm range it will go to while balanced to the rest of the rotating assembly. A billet crank would be the way to go, although I want to keep it safe within the limits of the stock shaft and see how that goes before throwing a wad of cash at one.

What is the early 1.8 with a 949 VVT head capable of in my case? 7800 limit with @170whp?
Terrible01 is offline   Reply With Quote
Old 11-15-2016, 05:18 PM   #26
Junior Member
iTrader: (1)
 
Join Date: May 2015
Location: Salem, OR
Posts: 363
Total Cats: 40
Default

Quote:
Originally Posted by Terrible01 View Post
I agree that the crank is a weak point, although I can't recall the rpm range it will go to while balanced to the rest of the rotating assembly. A billet crank would be the way to go, although I want to keep it safe within the limits of the stock shaft and see how that goes before throwing a wad of cash at one.

What is the early 1.8 with a 949 VVT head capable of in my case? 7800 limit with @170whp?
If Emilio ever sends mine out, I'll let you know. Will have the VVT CNC Head with a 1995 block.

EDIT: Baseline for my car was 105 whp. Hoping for 150 with head, full exhaust, intake, and MS3.
dleavitt is offline   Reply With Quote
Old 11-15-2016, 09:09 PM   #27
Newb
Thread Starter
 
Join Date: May 2016
Posts: 13
Total Cats: 0
Default

Quote:
Originally Posted by dleavitt View Post
If Emilio ever sends mine out, I'll let you know. Will have the VVT CNC Head with a 1995 block.

EDIT: Baseline for my car was 105 whp. Hoping for 150 with head, full exhaust, intake, and MS3.
What will the compression ratio be?

I'm in no hurry, so I'll definitely keep an eye out for the results!
Terrible01 is offline   Reply With Quote
Old 11-15-2016, 09:11 PM   #28
Junior Member
iTrader: (1)
 
Join Date: May 2015
Location: Salem, OR
Posts: 363
Total Cats: 40
Default

Quote:
Originally Posted by Terrible01 View Post
What will the compression ratio be?

I'm in no hurry, so I'll definitely keep an eye out for the results!
Bottom end is stock, so 9:1. Not the best for max NA power, but it's what I have.
dleavitt is offline   Reply With Quote
Old 11-18-2016, 12:19 AM   #29
Supporting Vendor
iTrader: (3)
 
emilio700's Avatar
 
Join Date: May 2005
Posts: 5,313
Total Cats: 1,335
Default

Quote:
Originally Posted by Terrible01 View Post
And a few pics for reference.. This is during the motor swap
Just saw this pic. That intake is awful. Steel is a no go. Needs to be aluminum to get rid of heat when you open throttle. Steel has much higher thermal mass and lower thermal inertia. It gets hot and stays hot.
Mandrel bends are key, particularly near the TB where you need to retain velocity. Yours also changes cross sectional shape and area. Both are bad. You set up resonance waves in there with those changes. Keep the ID constant from the TB to the filter. Increase the radius of that first bend at the TB as much as you can. That intake is costing you 5whp when the hood is closed.

MX-5 Miata Forum - View Single Post - 180whp 152tq CNC head
emilio700 is online now   Reply With Quote
Old 11-18-2016, 12:24 AM   #30
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,187
Total Cats: 2,583
Default

the man has spoken

now fix your car
18psi is offline   Reply With Quote
Old 11-18-2016, 07:10 AM   #31
Newb
Thread Starter
 
Join Date: May 2016
Posts: 13
Total Cats: 0
Default

Quote:
Originally Posted by emilio700 View Post
Just saw this pic. That intake is awful. Steel is a no go. Needs to be aluminum to get rid of heat when you open throttle. Steel has much higher thermal mass and lower thermal inertia. It gets hot and stays hot.
Mandrel bends are key, particularly near the TB where you need to retain velocity. Yours also changes cross sectional shape and area. Both are bad. You set up resonance waves in there with those changes. Keep the ID constant from the TB to the filter. Increase the radius of that first bend at the TB as much as you can. That intake is costing you 5whp when the hood is closed.

MX-5 Miata Forum - View Single Post - 180whp 152tq CNC head
Thanks Emilio, every bit helps. Do you have a pic of a intake that is to those dimensions ?

Quote:
Originally Posted by 18psi View Post
the man has spoken

now fix your car
LOL


I know right, but he's got a point. I never would have saw that and none of the folks posting here did either. Glad to have him around.
Terrible01 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Supertech vs Sealed Power VS855 Valve Springs Carloverx Engine Performance 38 08-21-2017 09:58 PM
Megasquirt 2 PNP, DW injectors, DW fuel pump jankymiata Miata parts for sale/trade 6 04-04-2016 03:11 PM
DW200 fuel pump Dietcoke Miata parts for sale/trade 4 04-02-2016 11:09 PM
Questions about alternator control in my Exocet boileralum MEGAsquirt 6 03-19-2016 08:07 PM
Fuel management Mohanad A Reda DIY Turbo Discussion 13 03-10-2016 03:25 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 09:11 PM.