2000SILVERTA

??? thinking of doing this plus 4.10's instead of 3.73's. What kind of gains should I expect, if any?

Lane

iTrader: (1)

In pretty good weather(+1100 DA), I was running 12.0+'s @ 110-111 mph with my Vig3200 and ET Streets. 1.63-1.65 60's and a great track.

In much worse weather(+2900 to +3500 DA) I ran the same times, with the same 60's, but at 111-112 mph on slicks on a crappy track.

In 0 to negative DA, I'm looking for 11.5's or better once I get rid of torque management. I'm still on stock tuning with the PT4200 as I was with the Vig.

12secSS

iTrader: (30)

Lane, I am basically you with the Vig3200, although I run at a shitty track. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> But I am contemplating switching to a YTP4200 in the future. How is the street driving, compared to the Vig3200, with the YTP4200? Obviously, the YTP4200 is a better track (and roll <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> ) converter than the Vig3200. I am trying to hit my goal of 12 flat at around 110 MPH at my local high elevation track. <img border="0" alt="[devil]" title="" src="graemlins/gr_devil.gif" /> Which would probably be mid 11s at 115 at a good sea level track. <img border="0" alt="[hail]" title="" src="graemlins/gr_hail.gif" />

<small>[ November 12, 2002, 11:33 PM: Message edited by: MRZ28HO ]</small>

Terry Burger

iTrader: (4)

George all you need is heads/cam to get there. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

FastMover

You should expect some traction issues. j/k <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

YOu might want to email Trevor D and ask him. I know he switched over from the Vig3200 to the TP4400. That converter is a beast. I had one but could not deal with driving with it everyday.

You could always get your Vig restalled to a 3600
.If you have not already had it restalled and it is under 2 years old they will do it for free.

Later

Jim <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />

2000SILVERTA

anyone else?

would the 4.10's even be worth it?

Lane

iTrader: (1)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by MRZ28HO:
<strong>Lane, I am basically you with the Vig3200, although I run at a shitty track. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> But I am contemplating switching to a YTP4200 in the future. How is the street driving, compared to the Vig3200, with the YTP4200? Obviously, the YTP4200 is a better track (and roll <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> ) converter than the Vig3200. I am trying to hit my goal of 12 flat at around 110 MPH at my local high elevation track. <img border="0" alt="[devil]" title="" src="graemlins/gr_devil.gif" /> Which would probably be mid 11s at 115 at a good sea level track. <img border="0" alt="[hail]" title="" src="graemlins/gr_hail.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">With 3.42's it's a little loose in red-light to red-light driving, but any other time it's the same - except at the track. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

nbm99ta

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Lane:
<strong>In pretty good weather(+1100 DA),

In much worse weather(+2900 to +3500 DA)

In 0 to negative DA, I'm looking for 11.5's or better
</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I give up, WTF is "DA"???????? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

2000SILVERTA

DA refers to density altitude. The lower the number the better. There is a conversion table somewhere on the net that lets you input your local weather and tells you the DA. I will try and find the site for ya later.............

12secSS

iTrader: (30)

DA = Density Altitude. More hardocre racers use this to compare timeslips from different days. The DA takes in account your elevation, then using a formula you can find out (using the weather conditions on the particular run) if the conditions were better/worse than the elevation.

Here are three links I use to sort through my timeslip numbers:

NHRA Correction Factors

Weather Conditions

Density Altitude Calculator

All this can be found in the Drag Racing section of LS1Tech.com, look for Member timeslips link on top. Then go to "add your timeslip" on this page

Lane

iTrader: (1)

The density altitude factor is HUGE. It can give you 2-4 tenths or take away 2-4 tenths - and not knowing about it will leave you wondering what's wrong with your car, when it's just the weather/air...

2000SILVERTA

so how much did changing from a vig 3200 to a Yank 4400 improve everyones et's?????

Trevor @ Texas Speed & Perf.

iTrader: (3)

I did not make any runs with just the converter swap from Vig 3200 to PT4400. I installed the converter and then swapped cams a few days later. I had some seat time on the street, though, and the gain was significant. If weather was held constant, I would expect to see a gain of .1-.15 switching from a Vig 3200 to a PT4400. I'm going to swap to 4.10's soon, so I'll let ya know how it goes. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> With stock internals, I think that 4.10's would be useless. With a healthy cam, heads/cam, etc., I think they'll be worth a little. JMO

Trevor

2000SILVERTA

thanks Trevor. A solid tenth would be sweet out of the converter swap. I am only gonna do 4.10's if the rear end gives up.

I am looking for some 11.2's or better outta this current engine combo, then will go with a lil bigger cam. I still havent got the car tuned for the heads, so, after that and the verter, my goal should be in reach.

JNorris

iTrader: (4)

I just went from the Vig3200 to the Yank PT4000.

On 11/8 I went 12.025 @ 111.30 1.64 60’ with a Vig3200. The DA was -85’
Today (11/23) I went 11.774 @ 113.02 1.59 60’ with a Yank PT4000. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> The DA was -34’
The only difference between the two runs was the converter, the small difference in the DA, and the car was about 30lbs heavier today.
For me the change was worth .251s in the ¼.

The PT4000 is an animal of a converter! <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />

John

justin sutton

Did you lose any driveability going to the pt4000 over the vig?

nysbadmk8

of course he did!

JNorris

iTrader: (4)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by justin sutton:
<strong>Did you lose any driveability going to the pt4000 over the vig?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Drivability defiantly took a hit. I leave traffic lights at 2700 rpm to keep up with traffic. Once the converter locks up then it is just like stock. This is not the converter for a daily driver in heavy stop and go traffic with a long commute. However for me it is just fine. I am willing to give up some drivability for almost 3/10 <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> improvement at the track.
At the track the PT4000 rules! <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />

John

12secSS

iTrader: (30)

John, excelent information. Sounds like I fit your "Not for daily driver ... " <img border="0" title="" alt="[Sad]" src="gr_sad.gif" /> But hey, I am willing to give up driveablity for ET as well. <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />

All in due time ... <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

justin sutton

I figured you lost some.I was just wondering if it was still drivable.Thanks for the info.