Higher boost, help with timing map - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 04-25-2016, 05:05 AM   #1
Junior Member
Thread Starter
 
Join Date: Nov 2015
Posts: 67
Total Cats: -6
Default Higher boost, help with timing map

So I've recently upgraded to rx-8 yellow injectors, and I'm turning up the boost with a no-name manual boost controller. My setup is a greddy td04 turbo, greddy manifold, open 2" downpipe, mspnp2, small ebay fmic, zero boost leaks, 11lb cm flywheel/stage 2 clutch. I'm also getting quite a bit of boost droop. 17-12 psi at 6500 redline, another issue that I would like some help with. Here's a log of that run, in 4th gear, and also my tune file with a little bit of timing pulled from that run as power fell off quite hard at the end of the run. I know this seems like a lot of boost, but my power numbers are 225hp/240tq according to virtual dyno. Since power fell off so hard on that run, I assumed there was too much timing up top. Is it okay now? what/where should I change on it? Any thoughts on this are greatly appreciated.
Attached Files
File Type: msl reb-12-wot.msl (109.0 KB, 31 views)
File Type: msq rev-13.msq (110.1 KB, 41 views)

Last edited by Rshannon81; 04-25-2016 at 05:10 AM. Reason: Missed some stuff
Rshannon81 is offline   Reply With Quote
Old 04-25-2016, 07:54 AM   #2
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,840
Total Cats: 1,786
Default

you have a 1.6L.

you drop to 12psi at redline. 225hp makes sense to me.

search: Helper Spring

timing vaules look pretty safe without being conservative.
Braineack is offline   Reply With Quote
Old 04-25-2016, 12:38 PM   #3
Junior Member
Thread Starter
 
Join Date: Nov 2015
Posts: 67
Total Cats: -6
Default

Is 17 psi too much do you think?
Rshannon81 is offline   Reply With Quote
Old 04-25-2016, 01:26 PM   #4
Elite Member
iTrader: (6)
 
Join Date: Feb 2013
Location: Staunton, Va
Posts: 2,399
Total Cats: 200
Default

You have provided a minuscule amount of data for us to make any judgment of any kind, in regards to your power goal and or potential..
ryansmoneypit is offline   Reply With Quote
Old 04-25-2016, 01:38 PM   #5
Junior Member
Thread Starter
 
Join Date: Nov 2015
Posts: 67
Total Cats: -6
Default

It is a 1.6 as Brain said. Power goal is 230/250. But that log plugged into virtual dyno, power falls on it's face above ~5800. I forgot to mention that it's not the stock greddy wastegate. It's a kinigauawa at 1/2 bar. I've given you a log and the tune. What else would you want?
Attached Thumbnails
Higher boost, help with timing map-80-222hp_cec9dcd73f67a6cd54b03b9368c8812bd137badd.png  
Rshannon81 is offline   Reply With Quote
Old 04-25-2016, 01:53 PM   #6
Elite Member
iTrader: (6)
 
Join Date: Feb 2013
Location: Staunton, Va
Posts: 2,399
Total Cats: 200
Default

All questions here...
Bottom end
Top end
Transmission
Clutch
Rear end
Exhaust
fuel pump
power goal
Intended use
ryansmoneypit is offline   Reply With Quote
Old 04-25-2016, 01:56 PM   #7
Junior Member
Thread Starter
 
Join Date: Nov 2015
Posts: 67
Total Cats: -6
Default

Okay, thanks!

I was told it had wiseco 8.5:1 when I bought it. But stock rods... Not sure I believe it.
ARP Head studs
Stock 5 spd
Clutchmaster stage 2 clutch
3.636 Torsen
Open 2" downpipe
230/250 Power/torque goal
Weekend warrior use
Rshannon81 is offline   Reply With Quote
Old 04-25-2016, 02:00 PM   #8
Elite Member
iTrader: (6)
 
Join Date: Feb 2013
Location: Staunton, Va
Posts: 2,399
Total Cats: 200
Default

A 3.63 and a 5 speed? How and why this? Trade for my 4.1 torsen?
ryansmoneypit is offline   Reply With Quote
Old 04-25-2016, 02:02 PM   #9
Elite Member
iTrader: (6)
 
Join Date: Feb 2013
Location: Staunton, Va
Posts: 2,399
Total Cats: 200
Default

Without knowing what is inside, I would say you are already at your limit. Hp and tq life expectancy of all your gear, is a search away. On this site.
ryansmoneypit is offline   Reply With Quote
Old 04-25-2016, 02:04 PM   #10
Junior Member
Thread Starter
 
Join Date: Nov 2015
Posts: 67
Total Cats: -6
Default

I'm aware of the limits of the stock motor, trans ect. I'm just wondering if my timing map is ideal or close to it. In that dyno graph power takes a hard dive at the end. I would like to make it more flat.
Rshannon81 is offline   Reply With Quote
Old 04-25-2016, 02:05 PM   #11
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,840
Total Cats: 1,786
Default

at 17psi youre making ~250rwtq.

stock, the car has like 80.

250tq minus 80 tq = 170tq gained from turbo.

170tq / 17psi = 10tq per boost level.


you're dropping from 17psi at peak to 12psi at readline, so you're giving up roughly 50tq at redline.

150tq + 50tq = 200tq.

200tq @ 7000rpm = ~266hp.



again, search: helper spring.
Braineack is offline   Reply With Quote
Old 04-25-2016, 02:20 PM   #12
Junior Member
Thread Starter
 
Join Date: Nov 2015
Posts: 67
Total Cats: -6
Default

I've read up on it. I may run to the hobby store and drill out the bracket and see what it does for me. I take it I should turn down the boost a tad to compensate for the extra pressure?
Rshannon81 is offline   Reply With Quote
Old 04-25-2016, 04:23 PM   #13
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,840
Total Cats: 1,786
Default

You need to worry about peak load, rpm doesn't matter. 240-250rwtq is limit for your rods and can still bend there.
Braineack is offline   Reply With Quote
Old 04-25-2016, 09:43 PM   #14
Junior Member
Thread Starter
 
Join Date: Nov 2015
Posts: 67
Total Cats: -6
Default

Money Pit, That's how I bought the car. I'll be switching to a 6 speed when I build my motor.
Rshannon81 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Tuning shop recommendations in Las Vegas? EpicOtter ECUs and Tuning 9 05-31-2016 02:35 PM
Ebay version of Delrin door Bushings? Bear.ube General Miata Chat 69 04-10-2016 04:31 AM
Manual rack differences thirdgen General Miata Chat 6 04-09-2016 05:59 PM
Mspnp2 Miata cranks but won't start jaredfigdor MEGAsquirt 1 04-05-2016 11:30 AM
Injector fitment hockey930 Engine Performance 4 04-02-2016 12:31 PM


Thread Tools

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 02:21 PM.