Aidan's SCCA Stock Class Autocross Build (Road Course is Too Scary) - Page 341 - 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 05-02-2016, 10:21 PM   #6801
SadFab Sales Lady
Thread Starter
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 14,795
Total Cats: 931
Default

Whats it called...mechanical empathy? I was trying it.
aidandj is offline   Reply With Quote
Old 05-03-2016, 07:43 PM   #6802
SadFab Sales Lady
Thread Starter
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 14,795
Total Cats: 931
Default

Also just purchased a Solid State relay so I can control the Walbro 400 with PWM instead of just always on.

Using this relay Hella Relays H41773001 - Free Shipping on Orders Over $99 at Summit Racing

its a negative control relay, so triggered by ground. Which means the standard Miata fuel pump output should work fine. I will jump the stock relay, (connect the fuel pump output from the MS to the tank wire, which will send the ground signal needed for the solid state relay), and wire this one in at the tank.

It's rated at 20amps continuous which is just above the walbro400 max current draw.
aidandj is offline   Reply With Quote
Old 05-03-2016, 09:06 PM   #6803
Junior Member
iTrader: (2)
 
williams805's Avatar
 
Join Date: Oct 2013
Location: Goleta, Southern California
Posts: 493
Total Cats: 23
Default

How do you plan to modulate it? One duty cycle for vacuum and another for boost?
williams805 is offline   Reply With Quote
Old 05-03-2016, 09:07 PM   #6804
SadFab Sales Lady
Thread Starter
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 14,795
Total Cats: 931
Default

With a fuel pressure sensor and megasquirt closed loop fuel pump control

At least that's the idea. Territory is somewhat uncharted.
aidandj is offline   Reply With Quote
Old 05-03-2016, 09:26 PM   #6805
Junior Member
iTrader: (2)
 
williams805's Avatar
 
Join Date: Oct 2013
Location: Goleta, Southern California
Posts: 493
Total Cats: 23
Default

So it will have to see pressure drop below a threashhold to up the duty?
williams805 is offline   Reply With Quote
Old 05-03-2016, 09:28 PM   #6806
SadFab Sales Lady
Thread Starter
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 14,795
Total Cats: 931
Default

Scratch that. Not using closed loop. Just open loop. Probably with a few different set points.

Also not using that relay. Revisited some other threads and will be using a MOSFET.
aidandj is offline   Reply With Quote
Old 05-03-2016, 09:47 PM   #6807
Elite Member
 
codrus's Avatar
 
Join Date: Mar 2007
Location: Santa Clara, CA
Posts: 2,947
Total Cats: 212
Default

Is this in place of a mechanical regulator, or in addition to?

If it's in place of a mechanical regulator then I think you need closed loop, otherwise, changing voltage will change fuel pressure.

--Ian
codrus is offline   Reply With Quote
Old 05-03-2016, 10:01 PM   #6808
SadFab Sales Lady
Thread Starter
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 14,795
Total Cats: 931
Default

In addition.
aidandj is offline   Reply With Quote
Old 05-03-2016, 10:04 PM   #6809
Elite Member
 
codrus's Avatar
 
Join Date: Mar 2007
Location: Santa Clara, CA
Posts: 2,947
Total Cats: 212
Default

Quote:
Originally Posted by aidandj View Post
In addition.
This is so you can have a longer idle pulse width?

--Ian
codrus is offline   Reply With Quote
Old 05-03-2016, 10:05 PM   #6810
SadFab Sales Lady
Thread Starter
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 14,795
Total Cats: 931
Default

Walbro 400. 1.**** making no horsepower. i don't need the thing running full speed all the time. I'm already going to be rewiring it back there so i'll use a solid state relay instead of a normal relay.
aidandj is offline   Reply With Quote
Old 05-03-2016, 11:07 PM   #6811
SadFab Sales Lady
Thread Starter
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 14,795
Total Cats: 931
Default

Ok I revisited some of the Hella data sheets and its basically a mosfet with a heat sink, and a normal socket compatible pinout. So I will be using that.

The standard fuel pump relay is a positive control relay, which uses the AFM 12v signal. Which we jump at the AFM connector. And then the megasquirt output grounds the relay.

This will be different. I will still use the signal from the megasquirt, but I will jump the wire from the megasquirt directly to the fuel pump wire that goes to the tank. That will give me a signal wire for the solid state relay.

The relay will be wired directly to the battery and fuel pump with 10 gauge wire.

I will use the open loop pwm control. Find the minimum duty cycles that I can hit my desired fuel pressure at, and then add a bit of duty cycle to be on the safe side.

aidandj is offline   Reply With Quote
Old 05-03-2016, 11:23 PM   #6812
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: woosta, ma
Posts: 8,598
Total Cats: 91
Default

Quote:
Originally Posted by aidandj View Post
Scratch that. Not using closed loop. Just open loop. Probably with a few different set points.

Also not using that relay. Revisited some other threads and will be using a MOSFET.
Lol that hella along with every other modern made relay is just a mosfet in a fancy package, even those normal black box ones.
Leafy is offline   Reply With Quote
Old 05-03-2016, 11:24 PM   #6813
SadFab Sales Lady
Thread Starter
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 14,795
Total Cats: 931
Default

See latests post. Its a mosfet in a nice package.
aidandj is offline   Reply With Quote
Old 05-05-2016, 11:30 PM   #6814
SadFab Sales Lady
Thread Starter
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 14,795
Total Cats: 931
Default

Track day was awesome. Car+driver was 3 seconds faster than October. And I only drove one event between now and then. Combination of tires, suspension, and a couple more cajones. I did a 1:33.6 last summer at full boost, and beat that today at low boost.

Had a blast chasing oregonmon in his VVT swapped NA, at low boost I didn't pull very hard on him at all, maybe 75% throttle.

October



Today

Attached Thumbnails
Aidan's SCCA Stock Class Autocross Build (Road Course is Too Scary)-eb2ehby.png   Aidan's SCCA Stock Class Autocross Build (Road Course is Too Scary)-hbsrbfa.png  
aidandj is offline   Reply With Quote
Old 05-05-2016, 11:46 PM   #6815
Cpt. Slow
iTrader: (24)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 11,632
Total Cats: 463
Default

See while you're slowly passing him, flip the switch and show him what he's missing.
curly is offline   Reply With Quote
Old 05-05-2016, 11:48 PM   #6816
SadFab Sales Lady
Thread Starter
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 14,795
Total Cats: 931
Default

When are you getting back on the boost train? Grab a taco taco and a brainey t3 and go to town.
aidandj is offline   Reply With Quote
Old 05-05-2016, 11:48 PM   #6817
SadFab CEO
iTrader: (3)
 
Join Date: Sep 2012
Location: your mom's house phoenix, AZ
Posts: 3,302
Total Cats: 400
Default

nice kawi
hi_im_sean is offline   Reply With Quote
Old 05-06-2016, 12:36 AM   #6818
SadFab Sales Lady
Thread Starter
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 14,795
Total Cats: 931
Default

Quote:
Originally Posted by hi_im_sean View Post
nice kawi
*** u talkin bout willis
aidandj is offline   Reply With Quote
Old 05-06-2016, 09:31 AM   #6819
Newb
 
Join Date: Apr 2015
Location: Portland OR
Posts: 14
Total Cats: 0
Default

Congrats on the 3 seconds but more importantly congrats on being that close to optimal =)
notbenh is offline   Reply With Quote
Old 05-06-2016, 11:01 AM   #6820
Senior Member
iTrader: (2)
 
Join Date: Nov 2011
Location: Beaverton, OR
Posts: 683
Total Cats: 27
Default

Aiden!!! Go faster !!!! More *****.
All kidding aside.
Nice improvements though. You've come a long way from that turn 2 tire wall.
greddygalant is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Autocross Class Unknown - An exercise in not caring ChasB Race Prep 31 10-26-2016 09:22 PM
Autocross/time attack build up drivehardaz General Miata Chat 11 07-21-2006 02:39 PM
Red Beast might be for sale... rmcelwee Cars for sale/trade 5 07-17-2006 04:38 AM
(not my Miata) Water in my CAI. And I/C piping. And I/C. And, finally, engine. UofACATS Insert BS here 4 07-11-2006 11:37 PM


Tags
aidan and sean's thread, brake fade? used pads., camera thread, can't catch meeeeee, dirt is my friend, hairline thread, landlord fuckery, linus strikes again, remarkable power!!!!!!!, sadfab rocks your butt, tires suck buy frozen rs3

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 On
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 10:08 AM.