Boost gauge reads 0 vacuum
#1
Boost gauge reads 0 vacuum
Hello this is my first post so let me know if I知 in the wrong place
I have a 1992 MX-5 with a CXracing turbo kit and a Megasquirt PNP ECU
the problem I知 having is my boost gauge never going into vacuum I smoke tested the engine and there are no leaks and my tuner said to get a better tune he needs to be able to tune vacuum but he can稚 because I知 not getting any (my tune right now is a little rough engine bogs until it痴 warm then when I drive it around for a while and I go into neutral the rpm drop to below 500 and sometimes stalls the car)
any suggestions help, I am desperate
I have a 1992 MX-5 with a CXracing turbo kit and a Megasquirt PNP ECU
the problem I知 having is my boost gauge never going into vacuum I smoke tested the engine and there are no leaks and my tuner said to get a better tune he needs to be able to tune vacuum but he can稚 because I知 not getting any (my tune right now is a little rough engine bogs until it痴 warm then when I drive it around for a while and I go into neutral the rpm drop to below 500 and sometimes stalls the car)
any suggestions help, I am desperate
#2
Tweaking Enginerd
iTrader: (2)
Join Date: Mar 2013
Location: Boulder, CO
Posts: 1,775
Total Cats: 358
Bet you hired that guy who charges $300 for remotes.
Step 1, fire your tooner.
Step 2, hire a real tuner.
You don't tune using a boost gauge. You tune with map. Use tuner studio to see if your map sensor is reading vac.
Step 1, fire your tooner.
Step 2, hire a real tuner.
You don't tune using a boost gauge. You tune with map. Use tuner studio to see if your map sensor is reading vac.
#6
Tweaking Enginerd
iTrader: (2)
Join Date: Mar 2013
Location: Boulder, CO
Posts: 1,775
Total Cats: 358
Cool, that changes things. Please understand that since COVID a bunch of remote "tuners" have popped up who charge for services they are totally unqualified to provide. It isn't quite as bad as the people who continue to install rx-8 yellows, but it is close.
The advice you have been given thus far is still valid as your starting point. Check TS to confirm your map isn't reading vac, and if it isn't, troubleshoot. The most common issue is a blocked signal line.
The advice you have been given thus far is still valid as your starting point. Check TS to confirm your map isn't reading vac, and if it isn't, troubleshoot. The most common issue is a blocked signal line.
#10
Sounds like the other end of the hose connected to your MAP sensor/ECU is connected to the piping before the throttle body. I.e in the intake pipe between the intercooler and throttle body. Thats one way you'll only see boost and near to no vacuum.
It needs to be connected to the intake manifold to read both vacuum and boost.
Post a photo of your engine bay.
It needs to be connected to the intake manifold to read both vacuum and boost.
Post a photo of your engine bay.
#16
SOLVED!
I found my vaccum leaks
my problem was when I smoke tested it I did not block the intake on the turbo so all the smoke was escaping there and not building pressure to escape from other places
still need to do the repairs fuel rail gaskets
Thank you everyone for your help
Case Closed
my problem was when I smoke tested it I did not block the intake on the turbo so all the smoke was escaping there and not building pressure to escape from other places
still need to do the repairs fuel rail gaskets
Thank you everyone for your help
Case Closed
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