Boost problems...

[DSMcrazy3]

I like how we have to jump at the chance to be RIGHT about something before everyone else. Gotta respect that.

I won

 

[oldman]

The vacuum reading I get is about 17 with the A/C on, when I turn it off it goes to about 20. I believe that is normal.

I'm not sure about the AC part but I don't see how AC will effect idle speed/intake pressure unless your ISC isn't functioning.

Sometimes when I free rev it goes to 0 sometimes it goes right below 0(not even to 1 vacuum). I know I'm not supposed to register boost on free rev. but should I build vacuum?

Stop free reeving like that, it's really bad for your motor. Intake pressure goes into negatives when the pistons are out flowing the throttle plate position so yes, it's normal for it to dip a little.

Is it ok to pressurize the system where my intake pipe goes, on that part of the turbo, to make sure nothing is leaking out of the back side of the compressor?

Yes, spray the compressor cover (depending on which turbo you have) with soapy water as they are know to leak as well. Disconnect or turn the mbc all the way up, open the oil cap and listen for leaks, just some more tips.

 

[DSMcrazy3]

Disconnect or turn the mbc all the way up, open the oil cap and listen for leaks, just some more tips.

I'm not running a MBC. If I hear something out of the oil cap what is the problem?

 

[oldman]

I won

Be nice, Ultimatedsm was just trying to help.

If I hear something out of the oil cap what is the problem?

PCV would have been one of them along with turbo seal (mostly not a problem during a static pressure test...mostly), valve seals or piston ring (small amount of blow by is normal, especially with good compression numbers).

1. Which turbo?

2. I'm assuming you're running pressure source directly to the actuator, what actuator allows you to run 3psi? Have you tested the actuator? flapper?

 

[XMasta19]

I know i need to do a test..I'm just stupid.

 

[Ultimatedsm]

Well I'm not too familar with the 420A engine, but i know one thing from past experience, if your car falls flat on its face when trying to boost, its a BOOST LEAK 95% of the time. So instead of trying other things, why don't you do a boost leak test first. You really are wasting your time with other stuff right now. In addition to that SCREW YOU ALL!!!!

 

[XMasta19]

it's ok...you're not the first 4g guy to come in our forum and get bashed for misinformation


wastegate actuator

 

[BigRand]

Well I'm not too familar with the 420A engine, but i know one thing from past experience, if your car falls flat on its face when trying to boost, its a BOOST LEAK 95% of the time. So instead of trying other things, why don't you do a boost leak test first. You really are wasting your time with other stuff right now. In addition to that SCREW YOU ALL!!!!

Hey man, everyone appreciates the help, you said what you had to say, all we were doing was making a point about the 420a motor that some people forget. And I have to give you respect just because your from my former home town. Scarbourough Ontario. CANADA. Tdot you know!

Okay done hijacking, back to the thread. Crazy just let us know the results of the boost leak test.

 

[Ultimatedsm]

it's ok...you're not the first 4g guy to come in our forum and get bashed for misinformation


wastegate actuator

How does that make me a spammer? What misleading information? I originally said check for boost leaks, like I said before Im not too familar with the 420A motor but now I know it doesn't have a MAF sensor. Everyone learns from experience. So you can take that spammer sign, turn it side ways and stick it up your ass

 

[Ultimatedsm]

Hey man, everyone appreciates the help, you said what you had to say, all we were doing was making a point about the 420a motor that some people forget. And I have to give you respect just because your from my former home town. Scarbourough Ontario. CANADA. Tdot you know!

Okay done hijacking, back to the thread. Crazy just let us know the results of the boost leak test.

I like how you posted that, thanks and TDOT RULES! .

 

[oldman]

Oh shit, I'm surrounded by 2Gnt guys, what's up guys...[slowly back away]

 

[Ultimatedsm]

Don't worry OLDMAN your not alone .

 

[oldman]

Don't worry OLDMAN your not alone .

Oh great, a Canadian's got my back.

 

[Ultimatedsm]

Yeah one COOL CANADIAN!

 

[DSMcrazy3]

Hey ultimate I didn't mean to seem like an ass, I just didn't like how you used caps on the "boost leak" like I were stupid haha, so I had to attack. J'k.

Anyways I will build a boost leak tester and do a leak test. I'll let you guys know what I get.

 

[XMasta19]

How does that make me a spammer? What misleading information? I originally said check for boost leaks, like I said before Im not too familar with the 420A motor but now I know it doesn't have a MAF sensor. Everyone learns from experience. So you can take that spammer sign, turn it side ways and stick it up your ass

umm, I wasn't callin u a spammer...it was after the words wastegate actuator which was my tidbit of advice for josh, then posting the smiley letting everyone know that my posts are pointless and he's my bestest buddy and he knows it. The misleading information....MAF. done sir done. you've been corrected now and it's over with. as for the spammer sign up my ass...I don't need to turn it sideways

 

[Ultimatedsm]

You sure you don't want turn the sign side ways? just kidding. When I did it in caps, I didn't mean you were stupid or anything, that didn't even go by my head, that mean't do it ASAP! . Anyway guys no hard feelings and I hope you get your car fixed. Boost leak test is the time to see how well your pipes hold up to pressure. If they can't handle it they will pop off thats what happend to me at 25 PSI.

 

[XMasta19]

Yay, we're all happy now...TDOT what!!!




I love u josh

 

[DSMcrazy3]

I know the importance of boost leak testing, and I know I should have done one sooner.

I'm going to have to ghetto rig one though with a bike tire valve stem and JBwaterweld. Should work fine though

 

[RiceKiller_TSi]

Hey, what the latest on this problem you were having?

 

[XMasta19]

yo josh did you call in sick yesterday

if so...you t/s the car right???




keep us updated darn you

 

[DSMcrazy3]

Well guys...I've been lazy, and getting mad at the car, not being able to find the boost problem...Not doing a boost leak test(sorry old man )..

BUT TODAY!!! I went to get my downpipe finished because I was running open downpipe, and when it was done, it was just as loud, that's when I realized the Head to ex. manifold gasket must have been leaking. So I went and got a new one and when Mike pulled the original one off, this is what we got..(i'll post the pic at the end). Well I replaced it, put it back together, and BOOST!!! Unfortunantly I have about 12 psi going right now So i'm going to assess that situation, then have a fun time boosting

You must be logged in to view this image or video.

Thanks for all of your info and help throughout the process.(I just thought I would keep you informed)

 

[XMasta19]

time for you to mod your wastegate

 

[Livid]

ouch. I had the same problem, I believe it happened to me because my internal gate was running at such a high psi, once I got my Tial 38mm I haven't had to replace it again.

 

[Randomrage]

ouch. I had the same problem, I believe it happened to me because my internal gate was running at such a high psi, once I got my Tial 38mm I haven't had to replace it again.

What did you do with the internal gate when you got the Tial? Weld the flapper door shut?