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Old 11-11-2017, 03:40 PM   #1
SCHMITTY
 
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Name: SCHMITTY
Title: Not enough time
Status: Not Here
Join Date: Jun 2012
Location: K beach, AK
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Posts: 1,177
Daily driving larger single - advice needed

So I have been adjusting my driving habits after switching from a 64/74/14 to a 71/76/.9 t4.

I have been fighting some bad surge . If I fuel the turbo too much it barks at every shift and can even start bucking when I hit lock up.

One of my buddies sent me a custom stiffer afc spring - it helped.

I put a stock fuel plate in - full forward.it helped but it is slower .

My other buddy cut the mwe groove larger from .140" to .245" It helped with around town driving but it will still buck when I hit od/lock up at wide open throttle. That shift happens around 3000 rpm

I have the afc pretty tight. The turbo is lit at 2500 and starts building boost around 1900 -2100 depending on what gear I'm in. With the afc looser it will
Start spooling well at 1900 rpm but it barks and surges badly so I cut fuel back.

I found that manual at higher Rpm's helps big time.

What am I missing ? 5k springs and higher shift points ? Too much air for the cylinder head?

I'm hitting 50 psi max boost right now. Drive pressure seems to be in the 60s - it flutters a little.

Timing is 19*
Stock stall triple disk
5x16s
7mm dv
3.54 gears and stock tires
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stock 94
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