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drilling air fittings..?? 300sd - Printable Version

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+--- Thread: drilling air fittings..?? 300sd (/showthread.php?tid=3939)

drilling air fittings..?? 300sd - cho - 09-21-2012

hi guys

I have read from some old std posts that some guys
do the drilling of air fittings...to equalize a bit of garret boost?

I assume that you (I) have to drill banjo bolt back on manifold and one on alda a 1mm or so, wider and put a bit wider hose..say 4 or 5mm?

correct?

why I wanna do it....I have a loooong turbo lag and sudden heavy boost


thanks


cheers
ChO


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RE: drilling air fittings..?? 300sd - aaa - 09-21-2012

I don't think it would alleviate the lag. It would alleviate the suddenness though.

Have you looked into the higher stall torque converter? Might help with lag.

RE: drilling air fittings..?? 300sd - cho - 09-21-2012

(09-21-2012, 08:08 AM)aaa Have you looked into the higher stall torque converter? Might help with lag.

thanks, please do elaborate me your last sentence

not a english native, so I have problems with eng.tech terms... Sad


edit: you suggest installing new torque conv. if I understand you correctly..?


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RE: drilling air fittings..?? 300sd - aaa - 09-21-2012

The 1985 torque converter had a higher stall speed, allowing the engine to reach higher rpm faster, which will lessen the lag.

RE: drilling air fittings..?? 300sd - cho - 09-21-2012

.

ok,got it Smile thanks mate

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RE: drilling air fittings..?? 300sd - Simpler=Better - 09-21-2012

Check your ALDA lines as well-they may be dirty and partially clogged,

or

Adjust / remove the ALDA so that the fueling curve is a bit smoother

RE: drilling air fittings..?? 300sd - cho - 09-21-2012

already did Smile, banjo's & lines are fine and clean...

I'm thinking of ALDA removal but some guys reported significant
fuel consumption issues... well,... no win win here I guess ...


tx


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RE: drilling air fittings..?? 300sd - Simpler=Better - 09-21-2012

Significant fuel usage if you always mash the pedal Big Grin

A small, GENTLE adjustment may help you

RE: drilling air fittings..?? 300sd - willbhere4u - 09-21-2012

Try adjusting the ALDA It only affects off boost fueling

RE: drilling air fittings..?? 300sd - cho - 09-24-2012

thanks guys,..

ALDA has been already adjusted also..."until smoke appears"
a year back.... basically I don't have a weak power problem,......

sudden (power) boost is issue I would like to resolve Smile

some KKK turbo might help Smile


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RE: drilling air fittings..?? 300sd - cho - 10-11-2012

I just found this one considering lag:

A downpipe with a smaller inner diameter offers less airflow, slightly reducing top-end horsepower. However, the smaller pipe diameter increases the speed of exhaust flow, thus allowing your turbocharger to spool faster, increasing response and low-end power.


is this true?
how to do calculation how much HP I will lose with 2 inch pipe instead
2.5 inch which I have now?


beers
ChO


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RE: drilling air fittings..?? 300sd - Simpler=Better - 10-11-2012

I would keep the 2.5" downpipe. Do you have a boost gauge installed?

RE: drilling air fittings..?? 300sd - cho - 10-11-2012

(10-11-2012, 10:09 AM)Simpler=Better I would keep the 2.5" downpipe. Do you have a boost gauge installed?


have one 5 bar 1st class rated, not installed yet....will tee soon

if above theory is correct I might consider 2 inch with muffler only
I dont use top speed anyway... so 5 or even 10 mph lost is ok..


edit: kind a funny post on superturbo diesel forum Smile))
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RE: drilling air fittings..?? 300sd - winmutt - 10-11-2012

Turn your ALDA out a bit.