XFiveLiter

First here's my mods,

Vig 3200, Whisper lid, FRA, Macs w/orp, RT catback (soon to be a D/D w/cutout), !swaybar.

Typical 60s on Nittos (245 16s) in the low to mid 1.7s launching as follows rpms at 1100-1200, easing into it w/a litle spin. Best of 12.29 @ 110.

Well I figured get some ET Streets (26x10.5x16) and dead hook my way into the low 1.6 range with ETs in the 12.0s or 12.1s. I figured wrong, with these tires I dead hook alright. The launch feels good but 60s are still in the low to mid 1.7s. ETs with these tires are 12.40s to 12.50s in good air. I tied launch rpms from off idle to 2500, same result. What gives? Is the slightly taller tire hurting gear ratio? Do I need more gear, converter, power or all the above.

I'm leaning toward some 3.73s, rpm through the traps is below 5500. More converter would only hurt streetability w/3.23s. Any input would be greatly appriciated.

Straight Line Performance

I ran into the same deal with my car. The only mods I had were a lid, and a PY3600E. I ran at a 600 ft. track (not enough shutdown room for the other 60 ft.), with RSA's it ran 7.76 @ 82.0, 1.87. With 26x11.5-16 ET's, it ran 7.73 @ 81.5, 1.83. So, I believe unless you have a bad boy conv. or a lot of gear, stick with DRs.

Albert

msce2b-dustin

I run the 11.5 et street and it is a fairly tall tire compared to the nitto. Your better off running the smallest tire possible and still be able to hook pretty good.. The added height is really hurting your gear ratio....

kent

Have you considered lower control arms with lowered brackets such as metco control arms which help with 60'time. Have you considered adjustable shocks to stiffen or soften up on front and rear of car for better traction. Have you considered rear passenger side air bag for better torque. These combination with different launch techiques with RPM launches, rear tire pressure settings (regardless slick, nitto,BFG), and shock settings. Just my three cents. Hope luck in achieving a new sixty foot time. Cheers.

The Juggernaut

iTrader: (7)

Just put a blower on it. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

MARKSZ71

iTrader: (3)

same problem here i guess i will go with a 12 bolt and 410s

XFiveLiter

Thanks guys, I think I'm just gonna gear it up (pinion seal is leaking anyway).

Kent, good points. But at my power level I dead hook w/the ET Streets, so traction is not a problem yet.

Sean, your a funny guy. <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" />

<small>[ June 01, 2002, 11:39 AM: Message edited by: XFiveLiter ]</small>

kent

I have the vig. 3200 stall convertor, metco LCA, Rear and Front Hals with front Hal Drag springs, 8 and 1/2 MT slicks size 15.10.26 and last time at the track got 1.602 and 1.608 my best ever. Set Hals on two in front and 6 at DR and 9 at PR. Tire presure was 16 DR and 15 PR. Random Techology Arm set at -3. Also, had skinnies on the front with air pressure set at 45. Launch between 1500 to 1800. I am not through experimenting in this area. Car has 3:73 gears on stock rearend. Stock transmission has transgo shift kit. My shifts are set at 6,250 which I believe is to low for a H/G5C car. Car has hardly any weight reduction and my aim is to run 1.55 or better. I believe you can run better to. Just trying to help. My best 60' time on 17 inch nitto's was 1.63, but now I believe I would do better because what I have learned with the slicks and setting of Hal shocks. I am going to install 24 MM rear sway bar for better launches. I have a right rear air bag sitting in my closet to be install later--this may be overkill--anyway I will proceed. Best ET on this car is 11.72. A friend and I are going to install a Mark Shanner port and polish throttle body and I am further hoping to get another tenth with this. The MS TB looks like a very professional job. Anyway, I did not mean to harp on and on, but I sharing my experience and information to try to assist you with your quest because I have been down this road before and still going down there and learning. Kent.

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

XFiveLiter

Thanks for the info Kent. If I have traction issues after the 3.73s, I'll start on the suspension. I don't even have SFCs <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />

Lane

iTrader: (1)

I can't run on anything but ET Streets, and even then I spin sometimes... These converters like to be loaded up.

What are your shift points and do you have HPP3 for the taller tire? If not, that's your problem IMO.

XFiveLiter

Lane, yes I do have HPP3. The first time at the track with that tire, it was shifting at around 5800-5900. Since then I upped the shift points, shifts now happen at 6100-6200. Is that about where I should be?

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 XFiveLiter:
<strong>Lane, yes I do have HPP3. The first time at the track with that tire, it was shifting at around 5800-5900. Since then I upped the shift points, shifts now happen at 6100-6200. Is that about where I should be?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Sounds about right. I've found +2 on the 1-2 shift to work best for me(6000+). And I just leave the 2-3 alone. Any more(on the 1-2 shift) and I hit the rev-limiter - which I set at 6400.

You are losing some gear with the 26" tires, but the extra traction will definitely help you when you get it set up right. 3.73's might help, but they might not. They didn't help a friend of mine... I went to 3.42's a couple of weeks ago and they did help me, plus the car drives like stock again.

Are you changing the tire height with the HPP3?

Supertrapped

I have a ST3500 and 2:73 gearing. I can't hook worth a damn on DRs. I have to use ET Streets.

What pressure are you runnin the ET Streets?

XFiveLiter

Lane, I did't adjust the HPP3 for the taller tire. Because I only run the ET Streets at the track and did not want to mess up the speedo. Would this effect something other than the speedo?

Devil Bird, 17-18psi works well for me at US41, I run the nittos at 19-20psi. They prep the track very well. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Pro Stock John

iTrader: (34)

If I had that setup, I would load up the converter to like 1200 and SLAM the gas. Is that what you are doing? I would do that and I'm sure you would hit 1.65 at least. You can also up the ET Streets until you spin, so as to decrease rolling resistance.

I'm sure your setup has a 12.1 or a 12.0 in it without 3.73's.

Do you have someone spotting you on your launches? 1.7's can also mean spinnage too.

I thought my 1.53-1.57's were okay until I was told that I was spinning 5 feet. I dropped the front HAL/QA1's down to 1/1 and went 1.51 with zero spin.

John
ARE 422 ci iron blah blah
11.1 1.53 (spinning)

XFiveLiter

I never had anyone acually spoting but, Sean (01-Z) said it looked like I was dead hooking (he was sitting in the stands). That run I tried launching off idle, which is 900 in drive, and ended up with a 1.75 60. After the initial hit to the tires it seems to fall on its face <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> , it feels like an animal out of the hole on the nittos. Is it possible to bog w/this converter? I wouldn't think so.

If I had A-tap maybe that would point me in the right direction.

BIGBOS

I was having a problem hooking my ET STREETS up at GLD...I didn't do the best burnouts, but when I did one to the point where I couldn't see the car I still cut a 1.79 60ft....that was launching off of 1500rpms...I felt it not dead hook and spin a tad, but the nose was up pretty good, but like after a second it seemed like it also fell on its face and then picked back up again...I was running 15 psi on both sides too... <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

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 XFiveLiter:
<strong>Lane, I did't adjust the HPP3 for the taller tire. Because I only run the ET Streets at the track and did not want to mess up the speedo. Would this effect something other than the speedo?
</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I would take the time to change it. Your shift points are set on mph. And with the taller tires, your mph will be off and so will your shift points. This may or may not help you, but I think it's still something worth trying... It makes a difference on my car.