TVS 1900 a little disapointed
Mar 24, 2010 | 12:28 AM
#41
Once you get some more power running through your tcase it wont disengage. My cammed 5.3 would disengage but on the 150 shot it wouldnt, and it wouldnt with my 418.
Mar 24, 2010 | 01:01 AM
#43
I kinda figured it was a drivetrain bindup preventing the shift forks & collars from shifting to 2 wheel, but hoped there was something electronic blocking the shift.
Anybody run shorter slicks on the back of a 4x4 truck at the track? I know the autotrak t-cases always have some pressure on the t-case clutches, and I don't wanna smoke them 1/4 mile at a time. GM says anything more than 1/4" difference in rolling circumference will kill t-case clutch packs, even if driven in 2 wheel drive.
Anybody run shorter slicks on the back of a 4x4 truck at the track? I know the autotrak t-cases always have some pressure on the t-case clutches, and I don't wanna smoke them 1/4 mile at a time. GM says anything more than 1/4" difference in rolling circumference will kill t-case clutch packs, even if driven in 2 wheel drive.
Mar 24, 2010 | 12:28 PM
#44
I've spoken with Brian before, and would happily magnacharge one of my other vehicles time, money and wife permitting 
Mar 24, 2010 | 01:49 PM
#46
Mine disengages, still using the stock 1/2 ton push button auto t-case. I don't disengage it till 100 -110 km/h though.
Mar 29, 2010 | 03:06 PM
#47
Thread Starter
Staging Lane
Joined: Feb 2009
Posts: 86
Likes: 0
From: Florida
Little update
Ok I checked the boost the other day Im making about 4.5 lbs 
I had to re tighten the intake bolts the recomended torque was not enough I had a little leak, it seemed to add about a half pound of boost by tightening the bolts more. I think now my 3.7 in pulley is holding me back. The good news is a 3.2 and a crank pin kit is on the way. I have worked on the tune quite a bit it made worlds of diff. so Im a lot happier now. When I launch in 4x4 hi it pulls like a mule till about 65-70 top end seems to suffer in comparison to down low. I chirps all 4 just brake stalling to 1700 rpm I hope the pulley helps top end.
I had to re tighten the intake bolts the recomended torque was not enough I had a little leak, it seemed to add about a half pound of boost by tightening the bolts more. I think now my 3.7 in pulley is holding me back. The good news is a 3.2 and a crank pin kit is on the way. I have worked on the tune quite a bit it made worlds of diff. so Im a lot happier now. When I launch in 4x4 hi it pulls like a mule till about 65-70 top end seems to suffer in comparison to down low. I chirps all 4 just brake stalling to 1700 rpm I hope the pulley helps top end.
Mar 29, 2010 | 04:31 PM
#49
...I can actually 'feel' the extra strain(and hear it) on the drivetrain when WOT above 80 mph in 4x4. Also, when I ran in 2 wheel drive, and spun the rear tires to the 1/8th before catching traction, I only lost about .5 seconds, but my mph was the same. It definately pulls harder(noticably) in 2 wheel drive at higher speeds. If funding allows, I will try slicks and 2wd racing this summer.
I have the push-button. I never tried lifting. ...
I have the push-button. I never tried lifting. ...
I heard GM came out w/. a special feature on Cobalt SS just for you. It's called no lift shift.
Mar 29, 2010 | 05:03 PM
#50
I have put my truck on the scales, with 1/2 tank of gas, 5740 pounds. It's heavy.
14.37 @ 90.52 with a 2.07 60 ft.
This was at around 4-5 psi boost, with stock cam and a locally built converter. I haven't been back to the track since the last round of mods.
14.37 @ 90.52 with a 2.07 60 ft.
This was at around 4-5 psi boost, with stock cam and a locally built converter. I haven't been back to the track since the last round of mods.
Last edited by AKlowriderZ71; Apr 2, 2010 at 01:01 PM.