Stock 1.6 AFM limit - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 05-04-2009, 02:52 PM   #1
Senior Member
Thread Starter
iTrader: (34)
 
ARTech's Avatar
 
Join Date: Mar 2009
Location: Dallas
Posts: 530
Total Cats: 9
Default Stock 1.6 AFM limit

I must be doing something wrong, because I can't find it in a search. I'm sure it's come up before.

At approximately what hp does the stock AFM max out? How much airflow can it read before it's pegged at 0v?

Or is it not as simple as that?
ARTech is offline   Reply With Quote
Old 05-04-2009, 03:28 PM   #2
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,889
Total Cats: 1,792
Default

Car goes into open loop at 4500RPM....so the readings matter little.
Braineack is offline   Reply With Quote
Old 05-04-2009, 03:37 PM   #3
Senior Member
Thread Starter
iTrader: (34)
 
ARTech's Avatar
 
Join Date: Mar 2009
Location: Dallas
Posts: 530
Total Cats: 9
Default

Open loop still should take into account at least 2 paramenters though, load and rpm.
ARTech is offline   Reply With Quote
Old 05-04-2009, 03:52 PM   #4
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Delicious and Moist.
Posts: 26,325
Total Cats: 1,924
Default

It's already damn near pegged in stock form.

From the link in my sig, here's a complete map of the 1.6 AFM's output. RPM is on the bottom, voltage is on the left, and each colored trace corresponds to a manifold pressure. These were taken on my EMU, so they're in relative PSI, where 0 PSI is atmospheric (100kPa).



Note that at redline, there's virtually no difference between -3.6 and +0.6. Also, this data is slightly "more optimum" than real-world, as I cleaned it up, did some extrapolation based on what I felt the curve was intended to look like, and intentionally made sure that there was at least some differentiation between datapoints, at least on the non-boosted side.

FWIW, this was with a Greddy turbo and a DIY "wide-n-narrow" FMIC.

Last edited by Joe Perez; 05-04-2009 at 10:56 PM. Reason: EMU, not EMB.
Joe Perez is online now   Reply With Quote
Old 05-04-2009, 10:37 PM   #5
Senior Member
Thread Starter
iTrader: (34)
 
ARTech's Avatar
 
Join Date: Mar 2009
Location: Dallas
Posts: 530
Total Cats: 9
Default

That's some great work Dr Perez. Thanks for taking the time to plot all that out. I'll eventually get rid of the AFM altogether, but for now, the EMB is what I'm working with.

You're right, resolution is crap. I guess I'll buy the MAP sensor.
ARTech is offline   Reply With Quote
Old 05-05-2009, 07:13 PM   #6
Former Vendor
 
Join Date: Jun 2006
Location: Bell Tuning & Performance
Posts: 1,338
Total Cats: -78
Default

The most you will get is about 200-210 whp.
Stephanie
Stephanie Turner is offline   Reply With Quote
Old 05-06-2009, 02:23 AM   #7
Senior Member
Thread Starter
iTrader: (34)
 
ARTech's Avatar
 
Join Date: Mar 2009
Location: Dallas
Posts: 530
Total Cats: 9
Default

Thanks. I'm just going to play it safe and tune based on MAP.
ARTech 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 58 12-13-2017 10:04 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

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 04:14 PM.