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Turbo questions - K24, WG Spring etc.




I guess I still have much to learn about forced air induction.

With regard to the comments in previous posts about K24 turbo and various
wastegate spring, I could probably use some re-education to straighten out
my understanding. 

I can understand how the K24 turbo can create more boost at low end.  It is
one of the upgrades I would consider for my '87 5KQT wagon, to help get more
low end torque.  Currently, the boost doesn't kick in until higher revs, and
then it is almost too much, 'cause I'm shifting by the time it kicks in.
Car is great on the highway though - will hit triple digits easily.  

BTW I have the car set to get about 1.9 bar through a pressure regulator.  I
almost never drive the car that way , however, some test runs got over
2.0(22 PSI) until I backed off because I was blowing the end caps of my IC,
and I didn't think it would be good to do more than this on a stock engine.

How then does the wastgate spring contribute to low end boost.  I thought
the wastegate was strictly to control overboost conditions, and has no
bearing as to when boost starts to kick in.  But comments in the posts
indicate one can change a spring and get more boost at low rpms.

What am I missing here.  Is there a low cost way to get my current turbo
(stock = K26?) to spool up faster?

Appreciate comments/dissertation to further my understanding to make
enlightened decisions on how to obtain better performance, esp. on the low
end.  Hope I'm not starting any turbo wars here.

I eventually would like to be able to use the wagon for towing a moderate
load compfortably.  I feel right now it would be aggravating to get stuck in
stop and go traffic at the Bay bridge towing a camper or boat.  I doubt I'll
be hitting over 100 MPH frequently, but just curious, how is top end
affected by K24, etc?

Comments below prompted my curiosity.  I assume the KH is the KH engine?

Regards,

Ben Swann

'85 4KQT - For sale $1200
'86 5KCSQT
'87 5KCSQT Wagon

>The spring allows for poor bottom end.<

>KH spring + MC engine. Wonderful match. There is more down low torque and
>the power is useable. Stock, a mild in crease in boost, maybe .1-.2. Power
>arrives earlier, but more progressive and incredibly controllable (I have
>a fwd 5 speed). It's overall a torquier feeling engine and I actually have
.what feels like power in the wg controller closed position. I've restored
>the adjustability in the boost increase; I haven't seen 1.7 bar since my
>old kh. Just goes straight from 1.5-1.9. I can execute many maneuvers that
>I haven't been able to since my kh.

>Conversely, I feel that the lighter mc spring in the kh + the wastegate
>controller would be a wonderful combination due to the engine's better off
.Idle torque.