No Knock sensor, running safe mode?

[KEMP]

My knock sensor is out of the car, because i brokeded it. so i was wondering if it would put it into safe mode and make it run kinda sh*tty. i have a 7lb spring in my external wastegate, and its only running 5psi on my 50trim, could it cause such low combustion that it would not build enough boost?

any thoughts would be great. Thank you
Modified by KEMP at 12:00 PM 1/5/2009

[float_6969]

It'll pull a bunch of timing, but that's about it. It shouldn't have any effect on your boost pressure.

[KEMP]

It'll pull a bunch of timing, but that's about it. It shouldn't have any effect on your boost pressure.

Its un-tuned on 444cc injectors, with a little correction on an SAFC, but no knock sensor and a big turbo.

it couldnt mess with boost at all? any ideas?

[float_6969]

Where are you getting the reference signal for the waste gate from?

[KEMP]

wh

Where are you getting the reference signal for the waste gate from?

What do you mean? i am using an HKS EVC 6 boost controller.

[float_6969]

What I'm getting at is the combustion won't make it boost less. If anything, severely retarded timing will make you run MORE boost, since you're wasting energy out of exhaust instead of using it to push down the piston.

If you're sure you have a 7psi spring, and you're only getting 5 psi, you've either got a big boost leak, an exhaust leak at the head or the turbo, your spring isn't really a 7psi spring, or your boost controller vac line routing is wrong.

If you had a boost leak, the car would run like azz off boost. It would have to be a BIG boost leak to cause you to loose 2 psi.

If you had an exhaust leak, you'd hear it.

It is possible that depending on the brand of wastegate you got, the spring is the wrong one.

Where do you have the vac lines routed for the boost controller?

Why do you have a boost controller if you're only gonna run wastegate pressure?

[KEMP]

well

What I'm getting at is the combustion won't make it boost less. If anything, severely retarded timing will make you run MORE boost, since you're wasting energy out of exhaust instead of using it to push down the piston.

If you're sure you have a 7psi spring, and you're only getting 5 psi, you've either got a big boost leak, an exhaust leak at the head or the turbo, your spring isn't really a 7psi spring, or your boost controller vac line routing is wrong.

If you had a boost leak, the car would run like azz off boost. It would have to be a BIG boost leak to cause you to loose 2 psi.

If you had an exhaust leak, you'd hear it.

It is possible that depending on the brand of wastegate you got, the spring is the wrong one.

Where do you have the vac lines routed for the boost controller?

Why do you have a boost controller if you're only gonna run wastegate pressure?

well it runs like it doesnt have a boost leak, out of boost its a champ.

its a TIAL 38mm, and i spiked 5.5psi today. im starting to think exhast leak before the turbo, but it doesnt ound like one, and it would have to be a big exhaust leak to make it not boost that much of a difference.

there is a vacline from the compressor to the controller, with a tee and a line going to the bottome port on the wastegate, then there is one on the top port going to the boost controller, i am like 99% sure its hooked up right, i literally looked at HKS's install directions while hooking it up, i even started over and did it again with new vac line.

im not sure what it could be, the ONLY things that have changed is the spring rate, intake cam, and head gasket/studs, and 444 injectors since i blew it,the old wastegate was an OBX with a VERY stiff spring, so i trashed that for a TIAL, before i could run 15psi no problems.

also, another thing is the knock sensor is out, but thats it.

i ned to figure this out NOW

[boost_boy]

My knock sensor is out of the car, because i brokeded it. so i was wondering if it would put it into safe mode and make it run kinda sh*tty. i have a 7lb spring in my external wastegate, and its only running 5psi on my 50trim, could it cause such low combustion that it would not build enough boost?

any thoughts would be great. Thank you

Modified by KEMP at 12:00 PM 1/5/2009

Unfortunately with that 50 trim, you're not going to build boost as fast as you would like. If your system has leaks it's going to lose boost. If your magic cam set-up is set-up wrong, you're going to experience problems. If your knock sensor is not hooked-up, you will still be able to build boost, regardless. If your wastegate actuator is causing you to lose boost, then there goes your boost. IMHO, it could be anyone of the things I mentioned. Good luck with that one.........

Dee

[KEMP]

Unfortunately with that 50 trim, you're not going to build boost as fast as you would like. If your system has leaks it's going to lose boost. If your magic cam set-up is set-up wrong, you're going to experience problems. If your knock sensor is not hooked-up, you will still be able to build boost, regardless. If your wastegate actuator is causing you to lose boost, then there goes your boost. IMHO, it could be anyone of the things I mentioned. Good luck with that one.........

Dee

Thanks, but i just put on a TIAL in perfect condition, and i know its not that, before i blew it up the turbo spooled great, way better and more boost than it will now. the cam is set one notch advanced like your supposed to, but i couldnt see that affecting boost pressure not being able to be raised, since it runs just fine, im going to do a porper boost leak test in about 30mins, i will post results. but it runs as if there is no boost leak, i am very confused on what to do. any other ideas?

[KEMP]

boost leak test passed, damn i am stumped

[rico05]

I have had my exhaust cam off and it have similar symptoms. It would make full boose however. I just had to revv the piss out of it to get anything out of the motor. And I have had my knock sensor come unplugged and have similar issues.

[KEMP]

ya, but its dead nuts on, and it gets the 5psi decently quick, but wont go past it...

im starting to think FUBAR turbo, since i did probably get some milkshake oil in it when i blew her up..

[rico05]

Still, replace that knock sensor.

[KEMP]

Still, replace that knock sensor.

i am going to, but i still do not know why it wont boost.

and the valve with a sensor plug on it that is tee'd in with the vac line that comes off of the I/C piping and then into the idle control valve.

what is that little pancake looking vlave? and whats it do?

[dash]

have you disconnected the wastegate line to see if the boost would go up ?

are your butterflys opening ? ...pancake valve

before i could run 15psi no problems.

before what?

[KEMP]

ya,

have you disconnected the wastegate line to see if the boost would go up ?

are your butterflys opening ? ...pancake valve

before what?

ya it wont change boost even with the wastegate un plugged

and i think the valves are opening, but it still should read the right boost in the manifold....