Max safe boost? [Merged 10-6]

[Turbolaser]

Is it safe to do the boost contol solenoid mod on a stock 1G?

 

[JayRolla]

You need an air filter since you said its just open. 12psi is nothing, a stock maf could run that. Have to remember that fuel cut is from pulling to much air and the maf gets over run. Not becuase of fuel so injectors, fuel pump all that stuff doesnt help fuel cut. You have a gm maf and maf-t so you should not have fuel cut issues. Running more than 12psi could cause you to run lean, you really need a logger to log knock.

Ohh and if you are hitting fuel cut then its most likely the maft is setup wrong or you have major boost leaks.

 

[Drubble]

I did not see an aftermarket boost gauge in your profile, so you may want to consider that a priority.

 

[hubz91talontsi]

Sorry yes i do have a boost gauge. I guess maybe i could have a boost leak. But yes i am hitting fuel cut very easily.

 

[JayRolla]

Its most likely a boost leak. I would test it to 20psi. The injector seals on the 1gs are usually a boost leak if they are original.

 

[hubz91talontsi]

How do you check for boost leak btw? Sorry if its a stupid question =X

 

[mikelv]

How do you check for boost leak btw? Sorry if its a stupid question =X

Here is a link to the Tech Articles that involves boost leak testers. There are three I believe on this website.

http://www.dsmtuners.com/forums/art...1554-boost-leak-check-device-alternative.html

This is by far the easiest and best way to do so, but I found something a little cheaper in quality. Just take a silicone coupler that matches your compressor housing inlet, (turbo inlet) or fits the outside diameter...just as an intercooler pipe coupler. Then get yourself a PVC Pipe Cap that matches the inside diameter of the coupler. Drill out a hole in the cap and seal a tire valve stem, secure it with hose clamps and you got a cheap tester. It won't hold a lot of air, but maybe 10-15lbs....enough to hear for obvious leaks.

For me, I've always found it easier if you have a compressor and can regulate the air. This particular article encompasses a pressure valve (gauge) on the tester. While this is nice, it's not necessary. Have someone help you by sitting in the car and watching the boost gauge as you conduct the test. Be carful not to "over-boost" the system. You really don't need that much air to listen for a leak, although you would ideally like to run as much pressure as your desired boost level. If you run low air pressure through the system, and dectect a leak, you know it's obvious that something is leaking.

The emphasis is on finding the actual leak. Keep the car off, charge the intake system and listen closely. Put your ear up to the intercooler piping couplers, listen for hissing noises. If your still using stock hoses it is quite possible they're worn considering make/model/year for our cars. The more pipes and bends, the bigger chance for leaks. Check the gaskets around your throttle body, injector seals, all vacum lines and seals, MBC or even Boost Gauge Lines.
The shop manual also suggests using just a stethoscope method while the car is running and listen around for hissing and air movement. While less accurate, it'll still work for ya!

Good Luck!

 

[97spyder maayng]

How do you check for boost leak btw? Sorry if its a stupid question =X

First make a boost leak tester, should cost you about $20 in parts at Home Depot.

Search on how to make one, it's very simple...then attach it to an air compressor until you hit 'X' psi and listen for leaks.

Good idea would be to put watery soap over anything having to to with intake (intercooler couplers especially). Most common boost leak would be coupler or the throttle body shaft seals, where if that's the case you'll need to replace the seals (very cheap and easy).

 

[hubz91talontsi]

Where do i hook up this leak tester?

 

[oldman420]

Hook it to your turbo inlet like mike previously stated.

 

[mikelv]

First make a boost leak tester, should cost you about $20 in parts at Home Depot.

Search on how to make one, it's very simple...then attach it to an air compressor until you hit 'X' psi and listen for leaks.

Good idea would be to put watery soap over anything having to to with intake (intercooler couplers especially). Most common boost leak would be coupler or the throttle body shaft seals, where if that's the case you'll need to replace the seals (very cheap and easy).

Ahh yes, this is one thing I forgot that'll help you. You can do this even if you don't make a tester and plan to try a stethoscope method first. You will see obvious bubbles where the air leaks.

 

[SFRacingGST]

How much boost are you running when you hit fuel cut. not running a boost controler will defl make you hit fuel cut every time...

 

[mikelv]

How much boost are you running when you hit fuel cut. not running a boost controler will defl make you hit fuel cut every time...

I second that.

 

[hubz91talontsi]

Well i think its right below 20. But i did log it however, my septic pipe like exploded in the basement. And i seriously have poop everywhere . So maybe in an hour or two i can upload some stuff for you guys. Sorry for the wait.

 

[hubz91talontsi]

Ok so i got a pic of the fmic and engine bay.

I hi lighted a spot that concerns me.

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

I can't upload a log atm, ill have to give her another run tomorrow something must have happened.

 

[hubz91talontsi]

help? =D

 

[mikelv]

Hey I'm not sure if it's just my network, but I can't see any of the pictures you uploaded? Try again please, I'd like to see how you have your intake system set up.

Please describe to us eactly how the car feels when something goes wrong. When you say it's fuel cut, are you positive that's what's happening?
You might be running into a hesitation issue somewhere else.

Please try and upload the photos again, or someone here let me know if it's just my computer, and we'll go from there to try and figure this one out.

 

[hubz91talontsi]

Ok i edited post 19 lets try that.

 

[mikelv]

Ok i edited post 19 lets try that.

Nah, dude, I still don't see anything? Not sure if it's me or you, sorry.

 

[thorlief4g63]

What does that line connect to?

 

[mikelv]

What does that line connect to?

I take it you mean something from the picture I can't see.

 

[anmGST]

The spot he is talking about is the nipple on the J pipe there is a red circle around it. The only thing I can see is the pipe size is great. The j pipe is like 1 3/4 and the intercooler pipe looks like its 3 inch?

 

[mikelv]

The spot he is talking about is the nipple on the J pipe there is a red circle around it. The only thing I can see is the pipe size is great. The j pipe is like 1 3/4 and the intercooler pipe looks like its 3 inch?

Does he have a proper reducer coupler? That size difference doesn't even seem possible? I wish I could see what your talking about.

What, a nipple for a MBC??

 

[oldman420]

Alright, go to www.vfaq.com and print the mbc install guide, actually grab the boost guage intall as well. Hook those babies up, turn you boost down to 10, when i had this setup my egt's were best at 10psi. Then if you do have a fuel problem or boost leak it will be easier to diag. without hitting fuel cut all the time. Also when you ripping if you see your boost guage hit max boost, then drop down a few psi, you most likely have a boost leak somewhere. Then you can pull out the old boost leak tool and soapy water. Most likely after installing those 2 things you will have a boost leak so i would test anyway to make sure.

 

[mikelv]

Okay I can finally see the picture. Must be the network in the office, which I SHOULDN'T BE ON HERE WITH ANYWAY!

I agree, 10psi is the safest bet and this should be enough air to ensure you don't cut out. I'd say the same thing, get the MBC right, double-check and then leak test it. Keep us updated!

 

[hubz91talontsi]

Why is my jpipe connected to my blowoff value?