Run without catalytic converter? HELP!!
- Thread starter Blake23
- Start date
scottyblazinlow
Red tyclone
Re: Run without catalytic converter? HELP!!
I'm running 3" from DP back with no cat and mine runs great.
I'm running 3" from DP back with no cat and mine runs great.
The Dread Pirate Fisher
Donating Member
Re: Run without catalytic converter? HELP!!
a spike is just that, a temporary over boost(more than the stock setting of 14.7psi) that will spike really quickly over the predetermined setting then drop. This can be dangerous as the computer only sees boost and can only regulate up to the 14.7psi so a spike will cause a quick lean condition.
Not to be confused with "overboost" which is a prolonged period of more than what's predetermined (14.7) and stays there without coming back down
Causes for both are the same, faulty wastegate actuator, or faulty solenoid, or little to no back pressure such as a larger diameter exhaust or no catalytic converter.
Our trucks are sensative to larger exhausts and no cat, due to the fact that the stock turbo has its waste gate hole welded with "puck". This makes it harder for the gases to escape quick enough to bring down the boost so you don't "spike", or "overboost".
To avoid these, on a stock truck, make sure your wastegate rod is set correctly and working with no impedence, check your vacuum lines on the turbo to wastegate, check your solenoid. There are also aftermarket solutions to aid solid boost control, such as a manual or electronic boost controller, a better wastegate actuator from Sportmachines, removing the welded puck on the turbo and doing a custom down pipe
a spike is just that, a temporary over boost(more than the stock setting of 14.7psi) that will spike really quickly over the predetermined setting then drop. This can be dangerous as the computer only sees boost and can only regulate up to the 14.7psi so a spike will cause a quick lean condition.
Not to be confused with "overboost" which is a prolonged period of more than what's predetermined (14.7) and stays there without coming back down
Causes for both are the same, faulty wastegate actuator, or faulty solenoid, or little to no back pressure such as a larger diameter exhaust or no catalytic converter.
Our trucks are sensative to larger exhausts and no cat, due to the fact that the stock turbo has its waste gate hole welded with "puck". This makes it harder for the gases to escape quick enough to bring down the boost so you don't "spike", or "overboost".
To avoid these, on a stock truck, make sure your wastegate rod is set correctly and working with no impedence, check your vacuum lines on the turbo to wastegate, check your solenoid. There are also aftermarket solutions to aid solid boost control, such as a manual or electronic boost controller, a better wastegate actuator from Sportmachines, removing the welded puck on the turbo and doing a custom down pipe
Blake23
1991 Gmc Syclone #0134
Re: Run without catalytic converter? HELP!!
it just seems odd to put one back in lol but i will if i have to have her run good :tup:
it just seems odd to put one back in lol but i will if i have to have her run good :tup:
