still over boosting

atomicmecha

atomicmecha

I hate rust
Need some help with my truck still wanting to overboost. I'm slowly working all the kinks out and getting it to be a solid (as possible) stock before I bolt on all these goodies I've got piled up. Lastest issue now that I'm back to driving it every couple days is that I've noticed its been peaking and poking around 16-20 psi in boost at times. Datalogger shows 15 since its still got the 2 bar map on it. But my AEM boost gauge climbs well past that on hard pulls. The needle on the dash almost disappears but thats expected, which is why I have the AEM gauge. Which is tapped into the RPM brake booster hose I have. Its a good reliable boost reading.

I thought maybe the solenoid was bad. So I got a new one. Didn't help. :x

Replaced the vac lines. Didn't help. :(

If I unplug the solenoid, not the vac lines, it'll run 9psi with the pedal on the floor all day long. So I think the wastegate is adjusted correctly? :?


What else could I be missing? Stock turbo. It still has the cat (or what looks to be a cat welded at the end of the DP. I'm tempted to just put the 3 bar map on and get a stock turbotweak chip for now just so I can get the computer to see the higher boost and utilize it vs running so lean. Or what would be a good manual boost controller to get that doesn't cost much?
 
littleblackpsycho

littleblackpsycho

Donating Member
Re: still over boosting

If it has stock memcal installed and the wastegate arm is adjusted right and operating correctly I would look at that cat. Even the high flow cats can cause over boost in my experiences.
 
dgoodhue

dgoodhue

BuSTeD 4.3
Re: still over boosting

If its hitting 16-20 psi it's probably not a stock chip. The stock chip will cut fuel if over 15 psi for more than 1 sec.
 
atomicmecha

atomicmecha

I hate rust
Re: still over boosting

This is my current cat...
20130406_120342.jpg


guessing that ain't stock... Guess that's my problem huh? :?

As for the chip, I thought it was stock. Last time I had the unit out it looked like the stock chip. Any easy way to tell?
 
atomicmecha

atomicmecha

I hate rust
Re: still over boosting

And am I remembering correctly that there's no reliable way to go cat-less on these trucks using the stock wastegate? that you have to go external to go cat-less?
 
0966Sy

0966Sy

Code what?
Simple fix, buy a forge wastegate from sportmachines. Tell them you want to run 15-16psi, keep your stock 2bar chip. You will not use the factory boost solenoid. Cat or no cat, it's solid boost control with super fast spool
 
atkonkler

atkonkler

Is this your bush?
Re: still over boosting

0966Sy said:
Simple fix, buy a forge wastegate from sportmachines. Tell them you want to run 15-16psi, keep your stock 2bar chip. You will not use the factory boost solenoid. Cat or no cat, it's solid boost control with super fast spool
Click to expand...

What he said....I've got one also...think it runs better with it than using my aem boost controller. ....talk to tom @sport machines!
 
Brwndrvr05

Brwndrvr05

Member
Re: still over boosting

0966Sy said:
Simple fix, buy a forge wastegate from sportmachines. Tell them you want to run 15-16psi, keep your stock 2bar chip. You will not use the factory boost solenoid. Cat or no cat, it's solid boost control with super fast spool
Click to expand...


Are you suggesting to completely remove it, or do you leave it plugged in and just disconnect the vac lines going to it, and just run the vac line from the turbo to wastegate? Not trying to thread jack, but am experiencing the same issue.
 
JAY

JAY

Donating Member
Re: still over boosting

Did this with mine too. The Forge is awesome. Turbotweak w/ a 3 bar will give you abit more but you'll run out of injector.
Check the vac hose routing on the w/g solenoid.
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: still over boosting

Before spending $100s, check the wastegate arm length. To check your chip, you're looking for a 4 letter code on it like AYBG, AYBN, BBZN etc. I don't know the codes off the top of my head.as mentioned, overboost should give you a code if stock. It's probably not stock.
 
Sportmachines

Sportmachines

Active member
Re: still over boosting

Def check you chip/tune. That cat doesn't look stock in that pic, looks much smaller, probably a high flow unit, which would also be suspect to causing the over boost issue.

The Forge WG we sell is pretty incredible, the boost control is amazing, rock solid, faster spool up and bolt on, so it has a lot of benefits. Maybe a good option, after you invest age the source of your issue. HTH
 
atomicmecha

atomicmecha

I hate rust
Re: still over boosting

Man, I'd love to get one of the forged wastegate setups from sportmachine. It's on my wishlist from them atm.

But I'm inclined to agree with you guys in that my chip is not stock. So I'm thinking of getting a turbotweak chip to go with my 3 bat map sensor. map is still in its little bag on my work bench. the stock 2 bar is whats installed. And yes i took it out and checked the model number, its a 2 bar. Would putting the new chip plus a 3 bar help with the overboost?

If yes... here's my new dilima... I was going to get a turbotweak chip already for when I install the vortec heads, 50# injectors, and new turbo. Problem is, I'm still working on the turbo part of that project. So do I get a chip now for the stock everything with a 3 bar map and then buy another chip later?
 
IGottaSy

IGottaSy

Active member
Re: still over boosting

blow-off valve, no more over boost...or much less anyway. the right parts are needed for sure for keeping tabs. 3 bar map a must so you can data log actual numbers instead of guessing at them.
did you fix it yet?
 
atomicmecha

atomicmecha

I hate rust
Re: still over boosting

Havent had a chance to look into this again till today. And even then it wasn't until 4 that it had dried enough from the rain to take it out and get a video of exactly what it's doing.

http://youtu.be/DWQ1shzH_Qo

Skip to about the 1:40 mark and thats where I finally get to punch it. You'll see the turbo gauge go flying past 14 and then come back. It'll keep spiking and trying to hit 20. I've seen it hit 20 but that normally happens after the motor has been warm for a while and is running better. Today wasn't a good day apparently. Going to do another one tomorrow after I mess around with some stuff. I've got a new turbo-to-intercooler hose that I'm going to put on to replace the stock one that I've learned has a small rip in it. Going to run with and without the solenoid plugged in.
 
dgoodhue

dgoodhue

BuSTeD 4.3
Re: still over boosting

To me it's looks like you have a Saudi resonator or something like that. It probably over boosting more because it's cold out and making more hp.

Have you adjust the wastegate arm length?
 
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