NA MIATA 1.8 Rods - 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 12-04-2012, 06:13 AM   #1
Newb
Thread Starter
 
Join Date: Dec 2012
Posts: 9
Total Cats: 0
Default NA MIATA 1.8 Rods

Hi,

i am completly new to the Miata and have a question regarding the stock rods. Can anyone tell for how much power and torq the stock 1.8 NA rods good for?

At what stage it makes sense to change the rods and do you have any advise?

Regards
1080 is offline   Reply With Quote
Old 12-04-2012, 06:25 AM   #2
Junior Member
 
Join Date: Oct 2010
Location: las vegas
Posts: 244
Total Cats: 4
Default

Quote:
Originally Posted by 1080 View Post
Hi,

i am completly new to the Miata and have a question regarding the stock rods. Can anyone tell for how much power and torq the stock 1.8 NA rods good for?

At what stage it makes sense to change the rods and do you have any advise?

Regards
I think the generally accepted value is about 250wtq if tuned properly with no det. Of course at that power level transmissions and other things become more prone to break.
hochkis is offline   Reply With Quote
Old 12-04-2012, 09:58 AM   #3
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 9,093
Total Cats: 90
Default

Man this question really does come up weekly. Brain, can we have a little writeup on things like this and make the question(s) you have to answer before you can get a membership be a quiz on the questions that come up constantly?
Leafy is offline   Reply With Quote
Old 12-04-2012, 10:00 AM   #4
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,899
Total Cats: 1,792
Default

Not worth the trouble.
Braineack is offline   Reply With Quote
Old 12-04-2012, 10:55 AM   #5
Newb
Thread Starter
 
Join Date: Dec 2012
Posts: 9
Total Cats: 0
Default

Sorry, i didnt know that this questions is coming every week cause i dont find anything with the search...

@hochkis
thx for your answer, but what is 250wtq for a unit?
Can you tell me the torq and bhp?

background is i have a NBFL engine which should run in my NA for trackday use. The engine have already 323 GTR pistons with a reduced compression, i guess 8.2:1 or so and a turbo. At least the engine have 230 bhp (not proven yet cause i dont have it on a dyno already) but i want to boost them a little bit more... so the questions is as long as the engine is out of the car, does it make sense to spend some extra money for new rods or can i run 300bhp with the stock ones?

Thx in advance for every helpfull answer.
1080 is offline   Reply With Quote
Old 12-04-2012, 11:07 AM   #6
Newb
 
Join Date: Jul 2012
Location: Tampa Bay, FL
Posts: 30
Total Cats: 0
Default

Quote:
Originally Posted by 1080 View Post
@hochkis
thx for your answer, but what is 250wtq for a unit?
Can you tell me the torq and bhp?
It means 250 wheel torque as in the torque applied through the wheels.

Quote:
Originally Posted by 1080 View Post
background is i have a NBFL engine which should run in my NA for trackday use. The engine have already 323 GTR pistons with a reduced compression, i guess 8.2:1 or so and a turbo. At least the engine have 230 bhp (not proven yet cause i dont have it on a dyno already) but i want to boost them a little bit more... so the questions is as long as the engine is out of the car, does it make sense to spend some extra money for new rods or can i run 300bhp with the stock ones?
If you already have the motor apart, upgrade the rods, it's cheap insurance even if youre only planning on making 300hp at the crank.
ShockerGT is offline   Reply With Quote
Old 12-04-2012, 11:28 AM   #7
Elite Member
iTrader: (5)
 
Erat's Avatar
 
Join Date: Oct 2011
Location: Detroit
Posts: 4,199
Total Cats: 260
Default

And you'll be back here in a month asking "my 5 speed blew up, what's a good replacement upgrade for it?".
Erat is offline   Reply With Quote
Old 12-04-2012, 11:46 AM   #8
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,899
Total Cats: 1,792
Default

with that CR level, you'll never need to worry about the rods; not enough torque.
Braineack is offline   Reply With Quote
Old 12-04-2012, 11:58 AM   #9
Elite Member
iTrader: (9)
 
TurboTim's Avatar
 
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,485
Total Cats: 248
Default

Quote:
Originally Posted by ShockerGT View Post
It means 250 wheel torque as in the torque applied through the wheels.
I think he does not know if you mean 250 newton-meters or something else.
TurboTim is offline   Reply With Quote
Old 12-04-2012, 12:17 PM   #10
Junior Member
iTrader: (5)
 
Join Date: Mar 2012
Location: Gilbert, Az
Posts: 337
Total Cats: 26
Default

Quote:
Originally Posted by TurboTim View Post
I think he does not know if you mean 250 newton-meters or something else.
3389544870 Ergs at the wheels
SJP0tato is offline   Reply With Quote
Old 12-04-2012, 12:22 PM   #11
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 9,093
Total Cats: 90
Default

0.125 ft-tons
Leafy is offline   Reply With Quote
Old 12-04-2012, 12:25 PM   #12
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,899
Total Cats: 1,792
Default

3000 in-lbs.
Braineack is offline   Reply With Quote
Old 12-04-2012, 12:29 PM   #13
Elite Member
iTrader: (5)
 
Erat's Avatar
 
Join Date: Oct 2011
Location: Detroit
Posts: 4,199
Total Cats: 260
Default

But how much Work is 250ft lbs?
Erat is offline   Reply With Quote
Old 12-04-2012, 12:32 PM   #14
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 9,093
Total Cats: 90
Default

250 lb-ft.
Leafy is offline   Reply With Quote
Old 12-04-2012, 12:33 PM   #15
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,899
Total Cats: 1,792
Default

Quote:
Originally Posted by Erat View Post
But how much Work is 250ft lbs?
caveman level.
Braineack is offline   Reply With Quote
Old 12-04-2012, 02:09 PM   #16
Senior Member
iTrader: (1)
 
Join Date: Sep 2008
Location: Tucson, Arizona
Posts: 889
Total Cats: 55
Default

There is a thread that covers all noob power questions. Even if it doesn't answer all it gives more info to search on https://www.miataturbo.net/diy-turbo...k-links-56507/
krissetsfire is offline   Reply With Quote
Old 12-04-2012, 02:13 PM   #17
Senior Member
iTrader: (1)
 
Join Date: Sep 2008
Location: Tucson, Arizona
Posts: 889
Total Cats: 55
Default

I'd be like over like 1500lbs if I were 250lb per ft. I'm sure I'd break the rods by then. Must be right. Like. Like. Like.
krissetsfire is offline   Reply With Quote
Old 12-04-2012, 03:45 PM   #18
Newb
Thread Starter
 
Join Date: Dec 2012
Posts: 9
Total Cats: 0
Default

Yeah, quiet funny.... but in Germany we have other units compare to the US. So sorry that wtq, lbs etc. dosent ring a bell.

Neverless, thx for the helpfull answers and the rest comments.
1080 is offline   Reply With Quote
Old 12-08-2012, 12:19 AM   #19
Junior Member
iTrader: (1)
 
Join Date: Jan 2008
Posts: 161
Total Cats: 0
Default

With a small T25 I would say about 10, maybe 12 psi. With a T3/T4, no more than 7-8 psi, and pray for no detonation.
psiturbo is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
NEW-Wiseco Piston, K1 Rods, Supertech Valves & Spring/Retainer, TB&C pedals Rudes333 Miata parts for sale/trade 17 11-05-2015 02:16 PM
starting issue Johnny Tater Engine Performance 3 09-23-2015 07:10 PM
Megasquirt 2 or 3 ? TheNomad Engine Performance 3 09-21-2015 11:20 PM
Can my stock ECU handle one more mod? TheNomad Engine Performance 30 09-19-2015 08:00 PM
Twitchy car (tail happy problem) bigben Race Prep 16 09-11-2015 04:41 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 10:08 AM.