running lean at 2500 rpms!
11-05-20, 08:26 AM
#27
RX-7 Bad Ass
iTrader: (55)
I've had mine removed for years with zero problems.
Dale
Dale
11-07-20, 05:45 PM
#28
Is anything different about your MAP sensor and plumbing? Have you changed the length of the vacuum line, or moved it to a different nipple on the intake manifold? Have you tried logging the raw MAP sensor voltage and raw fuel pressure sensor voltage at the fastest rate possible?
11-14-20, 06:50 PM
#30
I have not tried switching ports or length of hose for map sensor. I believe it is still hooked up to stock port without that filter thing that was inline to stock map sensor.
I'm running after market 4 bar map sensor bolted to same spot as stock
I'm running after market 4 bar map sensor bolted to same spot as stock
12-06-20, 03:24 PM
#34
I've been running lean as well and cooking the twin turbos. I took it to a local shop where they diagnosed the engine as running healthy but the air pump was causing the lean reading at the exhaust side...so we disconnected it and seems to be running fine now as a temporary solution
12-03-21, 02:53 AM
#35
Junior Member
same issue
just wondering if this issue got solved? i have a very similar issue. running lean at 2500rpm. car was stuck on a dyno for 2 days with even haltech logged into car while running. it doesnt seem to be ecu or fuel. engine runs sweet after 2500rpm ecu is an elite, enging jc cosmo 13bt efr 7670
12-03-21, 08:58 AM
#36
RX-7 Bad Ass
iTrader: (55)
I think the consensus In some other thread is running aftermarket rails/injectors with no fuel pulsation dampener. I believe you hit a certain pulsewidth/fuel pressure where you get some funky resonance in the fuel supply which creates a lean condition.
Dale
Dale
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DaveW (12-04-21)
12-03-21, 06:25 PM
#38
Junior Member
interesting! il ask my tuner and see what he thinks. we thought it might be the plate on the rear of the lim leaking as it has been welded on. but it all looks fine. i have removed the whole manifold to give to the tuner to have a look over. they did do fuel pressure checks to see if its spiking but it was all fine.
12-03-21, 09:13 PM
#39
interesting! il ask my tuner and see what he thinks. we thought it might be the plate on the rear of the lim leaking as it has been welded on. but it all looks fine. i have removed the whole manifold to give to the tuner to have a look over. they did do fuel pressure checks to see if its spiking but it was all fine.
12-03-21, 10:13 PM
#40
Junior Member
my tuner is here in Australia. they only tune haltech and are a specialised rotary shop. not to sure about the amount of fuel added. i had it tuned after run in. since then i done some work to it and sent it to this place. they are saying the last tuner has played with the numbers to make it work. that's how i found out. i am low on hp and full boost is not kicking in till 4500rpm. it runs sweet after it
12-05-21, 05:28 PM
#42
Junior Member
from factory they had on on the feed side of primary and discharge side of the secondary rails. i could be wrong tho. yea mine is also in the primary as well. if you are sucking in air anywhere that can do it. ive currently got the manifold off to take to the shop to get checked out.
12-05-21, 08:03 PM
#44
Junior Member
just took manifold to the shop. i have a plate that has been welded to the back of the lim. they think it "could" be leaking under the plate as there is 2 openings. the plate should be bolted on with a gasket not welded. i asked them about the pulsation dampener and they thought about that. they are saying my fuel is bang on.
12-06-21, 05:57 PM
#46
Junior Member
ive now got 4x 1650cc bosch injectors. ive got my manifold back. they removed plate from the back of lim and welded up 2 vacuum holes. will b olt it back on and see if it makes a difference
