Is an auto better with a turbo?

92GreyGT · March 20th, 2008, 09:05 PM

I am putting a turbo on a friends Mustang and he and I are having a debate. He says that with a stick shift the boost will drop off worse than with an auto. I would agree with this except we both powershift, leave the gas on the floor, stomp the clutch pedal and move shift to the next gear, how can the boost drop off? Of course when you shift the rpms of the engine will drop due to the gear ratio change but it will with the automatic also. He's not the first person I've heard say this but no one can answer my question, why?

He has a built powerglide (he just needs a converter) and a straight cut, dog ring engagement G Force T5 with the good G Force case and output shaft, so he can go either way.

HMUSN · March 20th, 2008, 09:06 PM

buy a blow off valve.

92GreyGT · March 20th, 2008, 09:13 PM

One came in the kit.

HMUSN · March 20th, 2008, 09:14 PM

that's the job of a blow off valve.. it's there so your boost doesn't drop .. auto OR manual

92GreyGT · March 20th, 2008, 09:24 PM

Cool!

Iwannagofast · March 20th, 2008, 09:44 PM

yeah i have heard you can can half a second in the quarter by powershifting vs not powershifting with a turbo

fogged306 · March 20th, 2008, 10:03 PM

Originally Posted by HMUSN

that's the job of a blow off valve.. it's there so your boost doesn't drop .. auto OR manual

I thought the blowoff valve was to relieve excess boost pressure when you let off the throttle.. you know, turbo still making boost and throttle blade is closed equal bad things without somewhere to go.. hence the blowoff valve. I'm no turbo expert but I thought thats how it went.

rodthrower2.3T · March 20th, 2008, 10:05 PM

yeah ^ is right
with an auto the throttle never closes during shifting, boost is not lost and spool time stays relatively the same

on a manual it just relieves pressure when the throttle is closed, saves compressor from surge and helps with respooling

Stangzilla · March 21st, 2008, 12:05 AM

+ if you miss a shift and dont have the right safety measures bad things can happen.. A built auto is far superior for a boosted cat IMO

March 20th, 2008, 09:05 PM	#1
92GreyGT Newbie 1992 Mustang GT 11.89@113.86 Join Date: Nov 2007 Location: Virginia Posts: 5 iTrader: 0 reviews	Is an auto better with a turbo? I am putting a turbo on a friends Mustang and he and I are having a debate. He says that with a stick shift the boost will drop off worse than with an auto. I would agree with this except we both powershift, leave the gas on the floor, stomp the clutch pedal and move shift to the next gear, how can the boost drop off? Of course when you shift the rpms of the engine will drop due to the gear ratio change but it will with the automatic also. He's not the first person I've heard say this but no one can answer my question, why? He has a built powerglide (he just needs a converter) and a straight cut, dog ring engagement G Force T5 with the good G Force case and output shaft, so he can go either way.

March 20th, 2008, 09:06 PM	#2
HMUSN Doc 1986 SVO 48.47@ 12.58 Join Date: Nov 2006 Posts: 37,050 iTrader: 11 reviews	buy a blow off valve. __________________

March 20th, 2008, 09:14 PM	#4
HMUSN Doc 1986 SVO 48.47@ 12.58 Join Date: Nov 2006 Posts: 37,050 iTrader: 11 reviews	that's the job of a blow off valve.. it's there so your boost doesn't drop .. auto OR manual __________________

March 21st, 2008, 12:05 AM	#9
Stangzilla MM Fanatic Join Date: Aug 2006 Location: On my way to Baines's house!! Posts: 3,298 iTrader: 0 reviews	+ if you miss a shift and dont have the right safety measures bad things can happen.. A built auto is far superior for a boosted cat IMO __________________ Rotating The Earth 1320 Feet At A Time!! Today, I found out that when I masturbate at night while watching internet porn I cast a huge shadow on the curtain and the entire street is able to see it.

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March 20th, 2008, 09:13 PM	#3
92GreyGT Newbie 1992 Mustang GT 11.89@113.86 Join Date: Nov 2007 Location: Virginia Posts: 5 iTrader: 0 reviews	One came in the kit.

March 20th, 2008, 09:24 PM	#5
92GreyGT Newbie 1992 Mustang GT 11.89@113.86 Join Date: Nov 2007 Location: Virginia Posts: 5 iTrader: 0 reviews	Cool!

March 20th, 2008, 10:05 PM	#8
rodthrower2.3T Regular 88 TurboChicken 8.40/83.4 Join Date: Sep 2007 Location: hobart, IN~W.Lafayette@Purdue Posts: 148 iTrader: 0 reviews	yeah ^ is right with an auto the throttle never closes during shifting, boost is not lost and spool time stays relatively the same on a manual it just relieves pressure when the throttle is closed, saves compressor from surge and helps with respooling

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