Who is going fast with a tight converter?
#1
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Who is going fast with a tight converter?
I am finally sending my 4l60e in for a refresh. Its an FLT level 7 with a Vig triple dish 3600. Nothing really wrong with trans buts its been going strong for 6 seasons and is starting to slip on high boost 2-3.
I am going to send the converter in during the refresh just to get looked at and maybe rebuilt. I am wanting a tighter feel on the converter. Maybe its loosened up over the years, I dont know.
Its a t-brake car too and was thinking something closer to 3000 rpm. I dont like the laggy feel on the street.
Who has some what of a tight converter and how do you like it at the track?
Its a 3900lbs 9 second car.
Alex
I am going to send the converter in during the refresh just to get looked at and maybe rebuilt. I am wanting a tighter feel on the converter. Maybe its loosened up over the years, I dont know.
Its a t-brake car too and was thinking something closer to 3000 rpm. I dont like the laggy feel on the street.
Who has some what of a tight converter and how do you like it at the track?
Its a 3900lbs 9 second car.
Alex
#2
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My converter is a neal chance nitrous converter which is super tight. I'm going to send it back to them so they can loosen it up for the turbo setup. Right now on the t-brake it only goes to 2600 rpm where it slowly builds boost over about 4-5 seconds. I can make 10 psi by 3200 rpm but it takes way too long. It's nice on the top end because converter slip is only around 2% and I've been able to go almost 147 @ 7100 rpm with my 3.90 gears. If they could leave the top end as tight as it is now and loosen up the lower end about 500 rpm it would be perfect.
I've still been able to cut 1.4 60' times with it I just want to be on the tbrake the least amount of time possible. That trans fluid gets super super hot the longer you are on the brake.
I've still been able to cut 1.4 60' times with it I just want to be on the tbrake the least amount of time possible. That trans fluid gets super super hot the longer you are on the brake.
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Thanks for the info. Car is super fast regardless.
My turbo spools super quick so I think I may be able to get away with something tighter and still build boost on the t-brake. I have my 2step set to 3200rpm and it builds it almost instantly on the brake.
My turbo spools super quick so I think I may be able to get away with something tighter and still build boost on the t-brake. I have my 2step set to 3200rpm and it builds it almost instantly on the brake.
#4
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Alot has to do with the part combo, cam timing, and turbo kit in general. I'm running a 14 blade stator in the 9.5" PTC which is crazy tight. (was running 17 blade prior) This net me under 2700rpm flash/stall on a 4.8 and under 4% slip up top and a 1600+ RPM drop on the shift.
Next year I redid the hotside in 2" , advanced cam, 2-step, and trans brake. Also installed a 370" engine. Now it comes up on boost plenty fast. At 159ish and 3100lbs on 1lbs of boost and see 950 rpm drop on shifts now.
Next year I redid the hotside in 2" , advanced cam, 2-step, and trans brake. Also installed a 370" engine. Now it comes up on boost plenty fast. At 159ish and 3100lbs on 1lbs of boost and see 950 rpm drop on shifts now.
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Please post results/info from the Vig rebuild. I have only dealt with one of them, but the when it was rebuilt due to a transmission failure, the results of examining the original build were quite interesting (not in a good way). I'm curious if this was an anomaly or not.
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Please post results/info from the Vig rebuild. I have only dealt with one of them, but the when it was rebuilt due to a transmission failure, the results of examining the original build were quite interesting (not in a good way). I'm curious if this was an anomaly or not.
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#8
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Converter is pretty tight, this is from last Saturday.. 5.0x with a soft tune up in it. We use a dump valve setup to aid in spool time.
Bolt together PTC with an aggressive stator in it. Usually comes up to the "chip" in 3ish seconds. (7-10 psi)
#9
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I had the single disc lock up VIG 3400. Worked great building boost down low and I could lock it up cruising so that part was nice. It was horrible slip wise up top at the track though. I’d see 18% thru the traps at 6k around 600whp and 3000lbs. This was a low RPM V6 setup so I knew it would be a little loose up top… but 18% is pretty ridiculous. I didn’t lock it up with the single disc at the track, thought I’d break it. Dropped in a PTC spec’d for my combo next season and slip dropped to 7%.
Can you still not lock it up with the multi disk converter at the track? I don’t see the appeal of a “tighter” converter if you can…
Can you still not lock it up with the multi disk converter at the track? I don’t see the appeal of a “tighter” converter if you can…
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No ive never calculated it I don't know how. Car was heavy before I started this phase some years ago it was 3800lbs with no one in it.