got MS working a little but...
#1
I'm Miserable!
Thread Starter
Join Date: Sep 2007
Location: Marysville, California
Posts: 203
Total Cats: 0
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
okay, i set my rev limiter at 7,200 but when i activate the boost and get to 5,000 my rpm just jumps back and cut some how...its like hitting a wall...what the heck is that?? help guys...
#4
Supporting Vendor
![](/mt2011/images_td/ranks/vendor.png)
iTrader: (5)
Join Date: Jun 2006
Location: Duluth, GA 30097
Posts: 803
Total Cats: 0
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Probably overboost protection, the base map has it set to 152kpa IIRC. Noise in the map signal can effect this as well (triggering overboost when it shouldn't yet), and it's predictive, so if it sees you heading to the limit really fast it will cut a hair before you get there so you don't get past it.
If you're running close to 6.5-7psi or more, you're going to need to raise this.
If you're running close to 6.5-7psi or more, you're going to need to raise this.
__________________
Jerry a.k.a. 'FoundSoul'
DIYAutoTune.com
'91 Miata BEGi S3 GT2560 w/ MSPNP - 14.1psi - 253whp, 232wtq
'95 Miata n/a
A few other cars....
Jerry a.k.a. 'FoundSoul'
DIYAutoTune.com
'91 Miata BEGi S3 GT2560 w/ MSPNP - 14.1psi - 253whp, 232wtq
'95 Miata n/a
A few other cars....
#5
I'm Miserable!
Thread Starter
Join Date: Sep 2007
Location: Marysville, California
Posts: 203
Total Cats: 0
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
okay...well my boost it at 10 i can't go any lower with that 16g wastegate.. ill check out my overboost protection, so just raise it up to 10psi? i also have a vacumme leak in my injectors...fuels are leaking A LOT! i think thats making my idle go up and down and engine shut off... will check it again tomorrow and will let you guys know...my 02 is dead so i can't get any reading on airfuel...but smells rich...thanks guys!
#6
Supporting Vendor
![](/mt2011/images_td/ranks/vendor.png)
iTrader: (5)
Join Date: Jun 2006
Location: Duluth, GA 30097
Posts: 803
Total Cats: 0
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Please fix the injector vacuum leak asap before you burn your car up
. I've seen more than one person post pictures of their project, burned to the ground...
As for overboost, it's in kpa not psi, 100kpa is approximately atmospheric so you're adding to that. ~6.9kpa per psi. So 100 + 69 = 169. But then add a little bit for the reasons posted above, maybe 10 kpa. Try setting it to 179kpa. If your boost goes above 10psi, you'll have to raise this again.
You can tell when overboost is cutting fuel by looking at a datalog. The PW will go to zero when MAP either hits or approaches the overboost limit. It's a fuel cut limiter.
![wink](https://www.miataturbo.net/images/smilies/wink.gif)
As for overboost, it's in kpa not psi, 100kpa is approximately atmospheric so you're adding to that. ~6.9kpa per psi. So 100 + 69 = 169. But then add a little bit for the reasons posted above, maybe 10 kpa. Try setting it to 179kpa. If your boost goes above 10psi, you'll have to raise this again.
You can tell when overboost is cutting fuel by looking at a datalog. The PW will go to zero when MAP either hits or approaches the overboost limit. It's a fuel cut limiter.
__________________
Jerry a.k.a. 'FoundSoul'
DIYAutoTune.com
'91 Miata BEGi S3 GT2560 w/ MSPNP - 14.1psi - 253whp, 232wtq
'95 Miata n/a
A few other cars....
Jerry a.k.a. 'FoundSoul'
DIYAutoTune.com
'91 Miata BEGi S3 GT2560 w/ MSPNP - 14.1psi - 253whp, 232wtq
'95 Miata n/a
A few other cars....
Thread
Thread Starter
Forum
Replies
Last Post
bigmackloud
Miata parts for sale/trade
19
01-08-2021 11:24 AM
StratoBlue1109
Miata parts for sale/trade
21
09-30-2018 01:09 PM
Frank_and_Beans
Supercharger Discussion
13
09-12-2016 08:17 PM