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Turbo EL cutting out about 8-9psi 

 

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 Post subject: Turbo EL cutting out about 8-9psi
Posted: Wed Sep 12, 2012 9:46 pm 
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well i got a j3 tuned according to my 42lb injectors and it gets to about 6-7 nicely and then about 8-9psi its like it dies out boost gauge will drop abit and then come back alive,now i know factory computer has 10psi cut but according to my boost gauge im getting 8-9psi.ive searched similar problems checked wastegate lines etc but cant come to a conclusion.and also my timing is standard i havnt retarted it.

 

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 Post subject: Re: Turbo EL cutting out about 8-9psi
Posted: Wed Sep 12, 2012 11:17 pm 
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Boost cut is around 10, not all gauges read the same and will vary depending were you get the pressure source from. Can you turn the boost down a tad or fit a bleed valve or bypass setup. Could also be a rich missfire.
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 Post subject: Re: Turbo EL cutting out about 8-9psi
Posted: Thu Sep 13, 2012 1:41 am 
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ive tried fitting a boost controller turning the boost own all the way i dont know if i have it setup all right but.
how im doing it is the bottom refrence from the wastegate straight on the intake manifold and then the top fitting onto boost controller then another vacuum from the intake manifold. Could 2 range colder spark plugs gapped to 0.8mm do this,this cut comes about 4-4.5rpm so i cant redline

 

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 Post subject: Re: Turbo EL cutting out about 8-9psi
Posted: Thu Sep 13, 2012 7:04 am 
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try gapping the plugs to .7 and see how that goes..
my plugs are a ngk bp7es gapped to .7..
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 Post subject: Re: Turbo EL cutting out about 8-9psi
Posted: Thu Sep 13, 2012 9:58 am 
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troyman i got the same plugs but gapped to .8,i went and got them after reading a few threads and you mentioned that they where good. is then anyway i can setup the wastegate to run lower boost

 

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 Post subject: Re: Turbo EL cutting out about 8-9psi
Posted: Thu Sep 13, 2012 10:21 am 
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Change the spring in the waste gate to 8psi ?

 

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 Post subject: Re: Turbo EL cutting out about 8-9psi
Posted: Thu Sep 13, 2012 12:00 pm 
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Cut the gate spring a bit

 

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 Post subject: Re: Turbo EL cutting out about 8-9psi
Posted: Wed Sep 19, 2012 11:16 am 
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krisisdog wrote:
Cut the gate spring a bit


cut the spring???????????isn't that a bit rough? I would be changing the spring to 8 psi like the guy said earlier.

 

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 Post subject: Re: Turbo EL cutting out about 8-9psi
Posted: Thu Dec 27, 2012 2:54 pm 
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Get a Fuel Cut Defeater and leave the spring alone.
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 Post subject: Re: Turbo EL cutting out about 8-9psi
Posted: Thu Dec 27, 2012 3:36 pm 
Oompa Loompa
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Dont believe the boost gauge... I had my old 180sx tuned by Dr drift to 20psi and when I fitted a boost gauge (speco btw) it only read 15psi. (Dyno print out showed 20psi)
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 Post subject: Re: Turbo EL cutting out about 8-9psi
Posted: Thu Dec 27, 2012 4:01 pm 
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ive got a microtech lt10s now so i dont think il have the problem once its back on the road

 

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 Post subject: Re: Turbo EL cutting out about 8-9psi
Posted: Thu Dec 27, 2012 9:54 pm 
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el-ghia wrote:
ive tried fitting a boost controller turning the boost own all the way i dont know if i have it setup all right but.
how im doing it is the bottom refrence from the wastegate straight on the intake manifold and then the top fitting onto boost controller then another vacuum from the intake manifold. Could 2 range colder spark plugs gapped to 0.8mm do this,this cut comes about 4-4.5rpm so i cant redline



anyone else pick up on how the wastegate is hooked up? Should have wastegate lower port going to inlet manifold with the boost tee in-between and top port just vents to atmosphere, you can put a hose on it and point it downwards so no water or dirt gets into the upper chamber of your wastegate and damages the diaphragm..

 

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 Post subject: Re: Turbo EL cutting out about 8-9psi
Posted: Thu Dec 27, 2012 9:59 pm 
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since then ive changed most things mate,realized aftermarket ecu was the best way to go,havent started on it yet its been sitting for a while,but i figured the top port vents so i took the boost controller off and the bottom port of the gate went to the inlet manifold il get the tuner to put the boost tap on when its getting tuned

 

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 Post subject: Re: Turbo EL cutting out about 8-9psi
Posted: Fri Dec 28, 2012 6:14 am 
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Are you still using the Factory MAP Sensor?
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 Post subject: Re: Turbo EL cutting out about 8-9psi
Posted: Fri Dec 28, 2012 8:03 am 
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microtech has inbuilt map sensor

 

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