3.73 Gears/Predator
Thread Starter
Teching In
Joined: Feb 2003
Posts: 8
Likes: 0
From: Stockton, Ca
3.73 Gears/Predator Thanks for the replies to my prior questions, but surely someone within this forum has changed to 3.73 gears and used the predator to reset the speedo. Was it difficult? Were you happy with the results? It sounds and if, for my simple performance inhancing use, the canned tune will meet my needs, but I still don't know if it was hard to do. Mine should arrive in a few days, so I guess I'll find out soon enough, but it would sure help if I knew you guys had done it and it worked. Any tips? Thanks in advance. -Livo-
PS-Should I set the fans to turn on sooner due to the 3.73 gearing working the engine a little more?
PS-Should I set the fans to turn on sooner due to the 3.73 gearing working the engine a little more?
TECH Fanatic
Joined: Nov 2001
Posts: 1,379
Likes: 0
From: Holly Springs NC
Re: 3.73 Gears/Predator I used my Predator to set my speedo to 4.10's and it's right on the money....went by one of those radar things the Cops sit by the roadside and it's 100%. **If you get messed up w/ the speedo thing, then PM me and I will call the local Engineers that made the Predator for the exact tire size you need....I had to call them) <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
I had to call my buddy at Diablosport (know the local guys that developed it) and I had to use tire size 235/40/14 as 'actual' instead of my old 275/40/17 under 'factory'
Enjoy the new gears, mine rock! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> <img border="0" alt="[driving]" title="" src="graemlins/gr_driving3.gif" />
<small>[ February 08, 2003, 07:23 AM: Message edited by: racer88 ]</small>
I had to call my buddy at Diablosport (know the local guys that developed it) and I had to use tire size 235/40/14 as 'actual' instead of my old 275/40/17 under 'factory'
Enjoy the new gears, mine rock! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> <img border="0" alt="[driving]" title="" src="graemlins/gr_driving3.gif" />
<small>[ February 08, 2003, 07:23 AM: Message edited by: racer88 ]</small>
Re: 3.73 Gears/Predator It looks simple to do but have no call to
do it myself. Saw somw stuff going around
about how sometimes this didn't work right
and you had to screw with tire sizes as a
back door fix. I think they talk about this
on their web site.
I would set the fans where you want the temp
to be, then regardless of how hard it works,
the temp is the best indicator of that, the
fans will just do their thing.
do it myself. Saw somw stuff going around
about how sometimes this didn't work right
and you had to screw with tire sizes as a
back door fix. I think they talk about this
on their web site.
I would set the fans where you want the temp
to be, then regardless of how hard it works,
the temp is the best indicator of that, the
fans will just do their thing.
10 Second Club
Joined: Nov 2002
Posts: 1,471
Likes: 3
From: Berkeley, California
Re: 3.73 Gears/Predator This is just a small addition to jimmyblue's comments. There is a bug in the current version of the Predator software in the section for changing the rear-end gears. The current remedy is to change the tire size instead. I telephoned RWTD and was told that this bug would be fixed by the end of February.
TECH Fanatic
Joined: Nov 2001
Posts: 1,379
Likes: 0
From: Holly Springs NC
Re: 3.73 Gears/Predator Yes, as I stated above it's not a big deal to add in the tire size to correct the speedometer.
You can call Diablosport in Boca Raton, FL and they will assist you.
<img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
You can call Diablosport in Boca Raton, FL and they will assist you.
<img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
On The Tree
Joined: Jan 2002
Posts: 116
Likes: 0
From: Cal
Re: 3.73 Gears/Predator I have 3.73's and a Predator and I had to correct using tire size. Unfortunately, my Predator is at home with the car and I'm at work right now. But I can try and remember to check it out tonight and get you the exact dimensions. As for specific settings, use full advance (2 degrees) and between 2.5 and 4% lean. With the only mods being an FIPK and DD we were able to get 14 RWHP/12 RWTQ at the peak power RPM and 17 RWHP/15 RWTQ at around 4200 RPM on the last car I dyno tuned with the Predator. I'm only about 20 minutes away from you down in Tracy so send me an E-mail if you have any other questions. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
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TECH Apprentice
Joined: Nov 2001
Posts: 317
Likes: 0
From: COLORADO SPRINGS, CO
Re: 3.73 Gears/Predator F-Bodies (Camaro/Firebird): Correcting of Speedometer after gear change
Problem: Currently in all versions (v1.00, v1.01, v1.02, v1.03) the axle ratio settings will not adjust the parameters w/in the pcm that controls the speedometer calibration. This only applies to F-bodies that have swapped their rear gear ratio out from factory to a lower gear ratio.
Temporary Fix: Please, from the main Predator screen, select Tune It, Modify Parameters, and then choose Factory Tire Size and Actual Tire Size, and make the necessary adjustments as noted below:
F = Factory Tire Size
A = Actual Tire Size
2.73 to 3.23 - F: 275/40-17 A: 245/35-15
2.73 to 3.42 - F: 275/40-17 A: 275/30-14
2.73 to 3.73 - F: 275/40-17 A: 175/35-14
2.73 to 4.10 - F: 275/40-17 A: 175/30-13
3.23 to 3.42 - F: 275/40-17 A: 235/50-15
3.23 to 3.73 - F: 275/40-17 A: 205/45-15
3.23 to 4.10 - F: 275/40-17 A: 165/40-15
3.42 to 3.73 - F: 275/40-17 A: 235/30-17
3.42 to 4.10 - F: 275/40-17 A: 235/40-14
Future Solution: The issue has been addressed and the newest update, v1.04 will incorporate the fix. There is no specific timeframe as to when v1.04 will be released, but as soon as it is we will update the site accordingly.
Problem: Currently in all versions (v1.00, v1.01, v1.02, v1.03) the axle ratio settings will not adjust the parameters w/in the pcm that controls the speedometer calibration. This only applies to F-bodies that have swapped their rear gear ratio out from factory to a lower gear ratio.
Temporary Fix: Please, from the main Predator screen, select Tune It, Modify Parameters, and then choose Factory Tire Size and Actual Tire Size, and make the necessary adjustments as noted below:
F = Factory Tire Size
A = Actual Tire Size
2.73 to 3.23 - F: 275/40-17 A: 245/35-15
2.73 to 3.42 - F: 275/40-17 A: 275/30-14
2.73 to 3.73 - F: 275/40-17 A: 175/35-14
2.73 to 4.10 - F: 275/40-17 A: 175/30-13
3.23 to 3.42 - F: 275/40-17 A: 235/50-15
3.23 to 3.73 - F: 275/40-17 A: 205/45-15
3.23 to 4.10 - F: 275/40-17 A: 165/40-15
3.42 to 3.73 - F: 275/40-17 A: 235/30-17
3.42 to 4.10 - F: 275/40-17 A: 235/40-14
Future Solution: The issue has been addressed and the newest update, v1.04 will incorporate the fix. There is no specific timeframe as to when v1.04 will be released, but as soon as it is we will update the site accordingly.
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Verdad Gallardo Thread Starter
Teching In
Joined: Feb 2003
Posts: 8
Likes: 0
From: Stockton, Ca
Re: 3.73 Gears/Predator Thanks for all the replies. I'm having the new gears installed next week and the adjustments will follow in @10 days. I really appreciate everyone's help. -Livo-