So my EBC's solenoid is dead.

I was wondering.. why not just use a larger wastegate spring? I'm sure there is some theory behind this and would like to know the benefits and downfalls of just putting a different wastegate spring in place of a boost controller (besides versatility in how much boost you want)?

For reference, I'm looking for 11-13psi on a TiAl 40mm wastegate. Right now it has a 7.5psi wastegate spring.

Thanks,
Mark

 

y not just get a MBC....i have a hallman MBC and is great...never spikes and you dont have to worry about any electrical work

 

EBC will let you tune the response more than a manual boost controller. Things like holding wastegate shut until preset boost pressure, holding steady boost throughout the powerband, and adjustability in the cockpit (multiple boost settings). Some advanced ones even let you modulate boost for different gears. There are many EBC's with many varying features. An electronic controller will do a better job than a manual one every time.

Solenoid failure you should look into where you are mounting it, vibrations and heat are good ways to kill it.

Simply swapping in a stronger spring will achieve the goal of increasing the boost, but running on wastegate alone the valve will start to open as soon as manifold pressure increases above atmospheric.

 

No down side, short of boost responce will be slightly slower. Porsche 911 turbo's have run that way for years. I run a 50mm HKS with a 1 bar spring, boost responce is very good with a T04E 57 trim .84 a/r.

 

I have HKS GT 60mm WG.

When running the .8-1.2 bar spring (it has adjustment rod for that range on WG head) it would creep open slowly as boost increased as has been already mentioned.

This makes boost come on a bit slower and is LOUD even at lower boost levels w/ open wastegate.

In addition, with the adj HKS WG design it will only open ALL the way at the highest boost pressure (1.2 bar for the .8-1.2bar spring) so if your set-up needs the full flow of the WG as mine did it will run 1.2 bar no matter what.

Now I run the lowest boost spring made for the wastegate and a Hallman Pro manual boost controller w/ the stiff spring adjusted to raise the boost to 1 bar.

It works great! Always at 1 bar w/ no boost spikes. It also keeps the wastegate all the way shut untill very near peak boost so you can drive fast around town quietly by shifting just short of full boost.

 

A good ball and spring type manual controller like the Hallman Pro will have great response. It will stay closed untill it needs to be opened.

I cant tell you how many cars Ive seen blow engines, not be able to be tuned, ect ect because thier EBC wasnt setup right, working right, going nuts, blah blah blah. Yea a lot of it might have been user error, but thats just the point, you dont have user error when its just 2 vac lines and a ****.

Stephen

 

And if need be, you can plumb the MBC into the cabin. I have an old school Racing beat in cabin boost controller, works great, looks great, and has an integrated gauge.

 

Thanks for all the replies, guys.

Guess I'll just go back to the ole MBC. This damned 8 year old GReddy was getting annoying anyway.

Here's my next question: Should I just keep the 7.5 psi spring then? Or should I do both?