estrada5.9
New member
- Joined
- Feb 27, 2007
- Messages
- 1,955
Good read thanks.
I take it still no towing results?
I bet you a dollar to a doughnut if you clamp your rear springs or put some traction bars on your truck your gov. spring problems will disappear. $.02
Why would spring wrap become an issue at constant speed or light acceleration, but not heavy accel, when spring wrap normally occurs? I've had this for the last year, first came on after I installed SDX Comp DV's, then moved to only when I was towing something when I went back to the stock 181's, but upgraded from 3k's to 4k's. 4k's and the Comp DV's was just a nasty combo to drive.
Not sure if it helps to know, but I've got the 3500 over load springs and Firestone airbags out back. The bags were aired up when this happened.
-Dustin-
I already mentioned this in your dyno thread, but it needs to be repeated.
When you enlarged the stock HX35 wastegate to 30mm+, the little actuator no longer has a strong enough spring to hold it closed. Drive pressure combined with boost working internally on the actuator lets the gate crack open at 10-15 psi. When that large wastegate cracks open, it diverts too much drive pressure from the HX35 and airflow suffers.
Obviously, low airflow hurt your dyno numbers, and it apparently hurt your towing performance as EGT's soared on your last heavy towing adventure.
If you're a machinist, build an adjustable spring controller for the HX35 wastegate using a heavy spring and a threaded rod for easy adjustment.
Your best temporary fix would be to pinch the wastegate line shut with a pair of vice grips so that boost does not help open the wastegate. It will still open early because the wastegate is too large and drive pressure will easily overcome the spring tension in the wastegate actuator, but, it will be better than it is right now.
Cutting back top-end fueling with a fuel plate will also help with EGT's. This will also severely limit horsepower. If you fix the wastegate problem, you'll gain horsepower and have better EGT control.