Boost high, drivers foot well HOT!

[PotatoFlakeSTi]

Ahoy,

I'd have posted this in a more suitable location, but can't since I'm a "newbie"

I recently bought a 1990 Eagle Talon, boost is currently at roughly 18psi. Tuned on a MAF-T Gen1. There is no wideband installed on it, it does however have a Manual boost controller(Hallman)... I attempted to turn down boost (2 full rotations) but boost stayed the same.

I'm frankly not sure how built this engine is(No audible ping), but I'd like to turn the boost down until I am more familiar with the car. (Rally/Hillclimb)

so...

- Am I correct in assuming the Hallman MBC is a ball and spring set-up?
- Are several rotations of the MBC commonly needed to reduce/raise boost?

Also, drivers footwell is getting hot, any recommendations? (Entire underside is skidplated)
- Reflective gold tape?
- Header/exhaust wrap?
- A better way to tune? (in the event that the problem is EGT caused from lean condition)
- Naca ducting to provide cooling? (not sure if regulation legal in all cases)

Sorry for the relatively rudimentary questions, I'll figure it out in a few days if I get no responses. Just brainstorming with myself, and hopefully some of you guys.

 

[bryanwheat]

The boost controller is probably hooked up wrong, or if is defective. Are you still on the stock turbo? turning it all the way down should take you down to around 10-12 psi which is wastegate pressure.

 

[PotatoFlakeSTi]

The boost controller is probably hooked up wrong, or if is defective. Are you still on the stock turbo? turning it all the way down should take you down to around 10-12 psi which is wastegate pressure.

I doubt it's hooked up incorrectly, but a malfunction is likely.
The car is currently running a 16g EvoIII.

Also, the way the car builds boost I don't think it's operating on wastegate pressure.

I won't be able to take a look at the car again until a day or two from now, unfortunately.

 

[92gsxbafaro]

check how your boost controller is hooked up it could be not plugged in the right hose from the compresser housing

try this link

http://www.dsmtuners.com/forums/articles-turbo-system-intercooler/237982-best-way-install-mbc.html

 

[PotatoFlakeSTi]

check how your boost controller is hooked up it could be not plugged in the right hose from the compresser housing

try this link

http://www.dsmtuners.com/forums/articles-turbo-system-intercooler/237982-best-way-install-mbc.html

I seriously think it's installed correctly, but I will double check when I have the opportunity, thank you very much for the link.

 

[joshcarp81]

Hallman aluminum mbc's stock boost pressures are when the boost controller knob is turned all the way out. It takes a few turns to build the psi with the lighter spring(lower boost pressures) installed seemed like the heavier spring (higher boost pressures) didnt take as many to get it where I wanted it to be. I currently have the lighter spring installed (not too many mods......yet....)
a combination of elevated boost and a lean condition would cause increased egt's for sure. get that boost down to stock levels and go from there.