?? about the change in downshift points w/ a gear change in a A4

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Dec 22, 2001 | 09:10 AM

11 Bravo

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From: Republic of Texas

?? about the change in downshift points w/ a gear change in a A4

I have considered going w/ 3.73's or even 4.10's in my car to help this A4 pull even harder on the highway. I understand that w/o programming I will have to punch it at a lower speed in order for the trans to shift into a lower gear. Does anyone know how much slower I would have to be going? I don't want to have a dead spot at 60mph, for instance. If HPP3 could change downshift points I would be in business.

[ December 22, 2001: Message edited by: 11 Bravo ]</p>

Dec 22, 2001 | 09:58 AM

Ragtop 99

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Re: ?? about the change in downshift points w/ a gear change in a A4

I think my car will downshift at 60 mph, but not 65mph. I have 3.73s. I've heard others have had to be as low as 55 mph; I don't know that happens often.

You can manually shift the car into 2nd if need be.

Do you have a converter? With my converter, even 65 mph in 3rd is not dead.

80 - 115 is awesome with 3.73s <img src="gr_images/icons/cool.gif" border="0">

Dec 22, 2001 | 10:37 AM

11 Bravo

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Re: ?? about the change in downshift points w/ a gear change in a A4

Yeah, Ragtop, I have a Vig #6. Right now, 65-70 mph is a very sweet spot. I never downshift manually, but what would be the safest maximum speed to drop it into 2nd or 3rd? I don't want to fry my trans or bend my pushrods, that's the reason I have never shifted it manually.

Dec 22, 2001 | 11:15 AM

Ragtop 99

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Re: ?? about the change in downshift points w/ a gear change in a A4

By 65 mph, I don't see a reason to downshift with 3.73s unless you can spin the motor to 6500. With 3.73s, the car is going to upshift at 68 - 73 mph depending on your shift points and how loose your converter is.

With 3.23s 65mph is a sweet spot as you're right in the powerband (4500 - 4800 rpm depending on your converter). With 3.73s it would be 5300 - 5600 rpm, which pulls hard, but you potentially have an upshift coming as quick as you can shift.

Dec 22, 2001 | 01:55 PM

11 Bravo

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From: Republic of Texas

Re: ?? about the change in downshift points w/ a gear change in a A4

Whats up Sam! There's a few of us SC guys on here. You have an A4? If you want to know what a Vig 3200 feels like let me know, you must get one <img src="gr_stretch.gif" border="0">

Mike

Dec 23, 2001 | 12:26 AM

sammysockethead

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Re: ?? about the change in downshift points w/ a gear change in a A4

11 Bravo. Hey neighbor! Glad to see someone nearby with a couple of mods I'm interested in. Send an Email sometime and maybe we can share an LS1 story or meet at Jackson dragway. Just now getting started with a few mods. (The fever is willing, but the wallet is weak!)

<img src="graemlins/gr_xmas.gif" border="0" alt="[santa]" />

Dec 23, 2001 | 12:53 AM

Pro Stock John

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Re: ?? about the change in downshift points w/ a gear change in a A4

I have 4.10's with an A4, and I would not reccomend them for a stock motor car.

Be careful with downshift at high speeds. at 65mph I would not manually downshift into 3rd with my 4.10's... I'll let the pcm decide... It should downshift into 3rd up until maybe 70mph?

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Dec 23, 2001 | 07:19 PM

Ragtop 99

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From: Bethesda, MD

Re: ?? about the change in downshift points w/ a gear change in a A4

[quote]Originally posted by Orange Krush:
<strong>Okay so with my current mods 4:10s are a no no?
3:73 are a yes yes? <img src="images/icons/confused.gif" border="0"> </strong><hr></blockquote>

I would do a converter first. Much bigger gain and no increase in highway rpms. But if you want gears, I would stick with 3.73s. With 4.10s you turn approx. 2900 rpm at 75mph on the highway. That's kinda high for your average daily driver.