hows it going guys. well heres another problem to be solved on the ty. i get on the freeway and get on the gas/boost and i overboost. my boost gage goes over 15 and all they way to max at 20 at half throttle. when im on the street and get on it i get a decent 12-15 boost but on the freeway it climbs all they way up. although once i get over 15 the exhaust seems to change note and sounds like a rocket or the wastegate dumping into it. i check the boost solenoid and disconnected and i get like 6-8 of boost so thats seems like its working fine. any ideas? stock turbo and waste gate. i was told my turbo has some thrust play in already so just waiting for it to go before i upgrade.
Overboost when on the freeway?
- Thread starter ilandaze2
- Start date
Tooky
Serious about performance
Re: Overboost when on the freeway?
Your combo is rather unusual (high flowing heads/cam upgrade but with a restrictive stock turbo). I believe that is the source of your problem. 20 PSI at half throttle is a serious problem on 93 octane fuel.
You could either get your chip's wastegate control retuned, or take matters into your own hands and get a manual ball and spring boost controller like the www.boostvalve.com unit. Although you are still going to be dealing with the fact that the stock wastegate is woefully inadequate for controlling boost on your combo.
Your combo is rather unusual (high flowing heads/cam upgrade but with a restrictive stock turbo). I believe that is the source of your problem. 20 PSI at half throttle is a serious problem on 93 octane fuel.
You could either get your chip's wastegate control retuned, or take matters into your own hands and get a manual ball and spring boost controller like the www.boostvalve.com unit. Although you are still going to be dealing with the fact that the stock wastegate is woefully inadequate for controlling boost on your combo.
turbodig
Active member
Re: Overboost when on the freeway?
Tell Nolan to take 20-30% out of your WG Duty Cycle table at 50-70.
Also check that your Wastegate isn't sticking when hot. A lot of them will work fine cold, but once warmed up will bind.
Also, check for leaks in the hoses around the WG solenoid.
You can make a stock turbo work just fine, with the right WG programming.
ilandaze2 said:
Tell Nolan to take 20-30% out of your WG Duty Cycle table at 50-70.
Also check that your Wastegate isn't sticking when hot. A lot of them will work fine cold, but once warmed up will bind.
Also, check for leaks in the hoses around the WG solenoid.
You can make a stock turbo work just fine, with the right WG programming.
Re: Overboost when on the freeway?
do i have to send nolan the chip back? can i run my truck with the stock ecu because the truck is my dd right now. i might have to wait until then end of the year when im on winter break. how do i check if the wastegate sticks if its hot? pull the plug on the boost solenoid?
do i have to send nolan the chip back? can i run my truck with the stock ecu because the truck is my dd right now. i might have to wait until then end of the year when im on winter break. how do i check if the wastegate sticks if its hot? pull the plug on the boost solenoid?
turbodig
Active member
Re: Overboost when on the freeway?
That would be something you'd have to take up with Nolan.
Pull the right side fenderwell, go for a drive, get a couple full boost pulls to get the turbo good and hot.
With the turbo still hot (ie, pull over while still hot, not after idling through residential neighborhoods), pull the WG arm pin and pull the rod off the arm (you'll need gloves and or a pliers).
With the rod off, you should be able to move the flapper arm with your little finger. If you can't, it's sticking.
The casting grows when hot, so an arm might work fine cold, but sticks when hot.
If you're satisfied that everything is working ok, you'll need to get the chip tweaked a bit.
ilandaze2 said:
That would be something you'd have to take up with Nolan.
Pull the right side fenderwell, go for a drive, get a couple full boost pulls to get the turbo good and hot.
With the turbo still hot (ie, pull over while still hot, not after idling through residential neighborhoods), pull the WG arm pin and pull the rod off the arm (you'll need gloves and or a pliers).
With the rod off, you should be able to move the flapper arm with your little finger. If you can't, it's sticking.
The casting grows when hot, so an arm might work fine cold, but sticks when hot.
If you're satisfied that everything is working ok, you'll need to get the chip tweaked a bit.
Syclone1639
New member
Re: Overboost when on the freeway?
Who programs WG in Austin? This is exactly what mine is doing.
Thanks All
turbodig said:
Who programs WG in Austin? This is exactly what mine is doing.
Thanks All