Maximum boost for autocross on stock 1.6 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Race Prep Miata race-only chat.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 03-20-2015, 12:57 PM   #1
Senior Member
Thread Starter
iTrader: (3)
 
Join Date: Oct 2008
Location: Indianapolis
Posts: 613
Total Cats: 12
Default Maximum boost for autocross on stock 1.6

Quick question, just dyno tuned my 1.6L and it put down 243hp @ 11.5-12psi. Do you guys think I should turn the boost down to maybe 10psi for autocross/ daily driving? 8psi yielded ~ 200hp
The engine is stock, freshened up with Mazda parts around 15000 miles ago. I have a stock 5 speed transmission as well. I don't have money to be blowing on rebuilding the engine, I hope it lasts this season, maybe 10-15 autocrosses.

For the record, I am running a sr20 t25 turbo, water to air cooler.

Thanks!
btabor is offline   Reply With Quote
Old 03-20-2015, 02:28 PM   #2
Junior Member
 
guttedmiata's Avatar
 
Join Date: Sep 2012
Posts: 438
Total Cats: -3
Default

Depending on torque, you are pushing the limits of the stock rods. I would turn it down based on that alone.
guttedmiata is offline   Reply With Quote
Old 03-20-2015, 02:41 PM   #3
mkturbo.com
iTrader: (24)
 
shuiend's Avatar
 
Join Date: May 2006
Location: Charleston SC
Posts: 13,775
Total Cats: 1,106
Default

Quote:
Originally Posted by guttedmiata View Post
Depending on torque, you are pushing the limits of the stock rods. I would turn it down based on that alone.
shut your mouth, there is only 1 correct answer to this question. He should run ALL OF IT!!!!!
shuiend is offline   Reply With Quote
Old 03-20-2015, 02:49 PM   #4
Elite Member
iTrader: (1)
 
Join Date: Jun 2014
Location: Austin, TX
Posts: 2,842
Total Cats: 271
Default

I'd turn it down for DD purpose/stock rods, crank it back up for autox where it counts
Girz0r is offline   Reply With Quote
Old 03-20-2015, 03:06 PM   #5
Junior Member
 
guttedmiata's Avatar
 
Join Date: Sep 2012
Posts: 438
Total Cats: -3
Default

Right, because rods bend in every other situation but not an autocross. Idiots
guttedmiata is offline   Reply With Quote
Old 03-20-2015, 03:09 PM   #6
Elite Member
iTrader: (3)
 
concealer404's Avatar
 
Join Date: Aug 2011
Posts: 8,460
Total Cats: 782
Default

His torque number is nowhere near the danger zone.

I'd run where it sits.
concealer404 is offline   Reply With Quote
Old 03-20-2015, 03:19 PM   #7
Junior Member
iTrader: (5)
 
Join Date: Oct 2014
Posts: 473
Total Cats: 23
Default

Would you mind posting your dyno graph with the T25? I would love to see how well your 1.6 spools that turbo.
90civichhb is offline   Reply With Quote
Old 03-20-2015, 03:25 PM   #8
Senior Member
Thread Starter
iTrader: (3)
 
Join Date: Oct 2008
Location: Indianapolis
Posts: 613
Total Cats: 12
Default

Quote:
Originally Posted by 90civichhb View Post
Would you mind posting your dyno graph with the T25? I would love to see how well your 1.6 spools that turbo.
I posted it under the dyno section
btabor is offline   Reply With Quote
Old 03-20-2015, 03:28 PM   #9
Junior Member
iTrader: (5)
 
Join Date: Oct 2014
Posts: 473
Total Cats: 23
Default

I am subbed to your build thread, but didn't see you post it. Just assumed you were wanting to keep it private or something.
90civichhb is offline   Reply With Quote
Old 03-20-2015, 03:30 PM   #10
Elite Member
iTrader: (3)
 
concealer404's Avatar
 
Join Date: Aug 2011
Posts: 8,460
Total Cats: 782
Default

Your max torque wouldn't have gone above 225ftlbs on that graph, on a dyno that isn't likely to be a heartbreaker.
concealer404 is offline   Reply With Quote
Old 03-20-2015, 03:45 PM   #11
Elite Member
iTrader: (2)
 
fooger03's Avatar
 
Join Date: Jan 2009
Location: Columbus, OH
Posts: 4,132
Total Cats: 187
Default

ALL OF IT
fooger03 is offline   Reply With Quote
Old 03-20-2015, 03:55 PM   #12
Junior Member
iTrader: (1)
 
Join Date: Jun 2014
Location: Metro Detroit
Posts: 270
Total Cats: 26
Default

Quote:
Originally Posted by btabor View Post
.... I don't have money to be blowing on rebuilding the engine, I hope it lasts this season, ...
180kpa should be fine as long as you're not knocking. If you want to ease your mind, set it to 170kpa and just enjoy it.
Ryephile is offline   Reply With Quote
Old 03-20-2015, 07:17 PM   #13
Elite Member
 
Join Date: Jul 2005
Location: Anacortes, WA
Posts: 2,475
Total Cats: 114
Default

All of it for autocross. So little time spent at peak torque with RPM's rising so quickly in second gear it becomes hard to hurt anything other than transmissions if you have any kind of decent tune.
bbundy is offline   Reply With Quote
Old 03-20-2015, 07:21 PM   #14
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,165
Total Cats: 2,573
Default

Quote:
Originally Posted by shuiend View Post
shut your mouth, there is only 1 correct answer to this question. He should run ALL OF IT!!!!!
came in here to post this
18psi is offline   Reply With Quote
Old 03-20-2015, 08:35 PM   #15
Senior Member
Thread Starter
iTrader: (3)
 
Join Date: Oct 2008
Location: Indianapolis
Posts: 613
Total Cats: 12
Default

Quote:
Originally Posted by 90civichhb View Post
I am subbed to your build thread, but didn't see you post it. Just assumed you were wanting to keep it private or something.
Nope not trying to keep it private. I have to post it there as well. I like to show off my water to air cooler and how effective it is. Credit to Harold Hammerly for building it.
btabor is offline   Reply With Quote
Old 03-20-2015, 08:37 PM   #16
Senior Member
Thread Starter
iTrader: (3)
 
Join Date: Oct 2008
Location: Indianapolis
Posts: 613
Total Cats: 12
Default

I think I'm going to turn it down to 10psi just so it lasts this summer. Maybe throw rods, oil cooler, be pump and a 6 speed next winter and crank it up to 14 psi
btabor is offline   Reply With Quote
Old 03-20-2015, 08:40 PM   #17
mkturbo.com
iTrader: (24)
 
shuiend's Avatar
 
Join Date: May 2006
Location: Charleston SC
Posts: 13,775
Total Cats: 1,106
Default

shuiend is offline   Reply With Quote
Old 03-20-2015, 10:59 PM   #18
Junior Member
 
guttedmiata's Avatar
 
Join Date: Sep 2012
Posts: 438
Total Cats: -3
Default

Easy to be cavalier with someone else's car and money.

Run ALL OF IT if you can get any of those giving said advise to sign a contract stating they will fund the rebuild if it fails.

Now where is that chirping cricket smilie......
guttedmiata is offline   Reply With Quote
Old 03-20-2015, 11:10 PM   #19
Senior Member
Thread Starter
iTrader: (3)
 
Join Date: Oct 2008
Location: Indianapolis
Posts: 613
Total Cats: 12
Default

I think my plan is to run ALL OF THE AUTOCROSSES instead of all the boost. I think 10psi will do. I was trying to get advice from someone with the same/ similar setup
btabor is offline   Reply With Quote
Old 03-20-2015, 11:55 PM   #20
Elite Member
 
Join Date: Apr 2010
Location: Newcastle, Australia
Posts: 2,638
Total Cats: 25
Default

Make less than 240ftlb at the crank calculated from the dyno sheet.

This is literally the only correct answer.

Dann
nitrodann is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 57 07-19-2017 05:11 PM
WTB MP62 (Hotside) (NB2) Rick02R WTB 3 01-03-2016 08:18 PM
Expected intake temps on the track? tazswing Race Prep 20 10-03-2015 12:04 PM
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 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 03:58 AM.