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Discussion Starter #1
im trying to figure if my converter is slipping too much. i logged a run at the track and here is what happend. i only have 1/8 miles near me so the calculator isnt accurate.

1-2 shift 6550rpm dropped to 6200rpm
2-3 shift 6700rpm dropped to 6200rpm

that was on a 6.2 @116mph pass. 2002 camaro SS 91mm turbo 400cu lsX.

thanks guys

happy new year
 

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The stall speed at that level of boost is 6200 rpm , so you either have it lowered or shift the motor higher for more rpm drop. I would like to see 1000-1200 drop.


Hutch
 

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Discussion Starter #4
gotcha... thanks for the info. i guess ill be sending this thing out.
 

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Like Hutch said, take it deeper (more rpm) before the shifts. I would think that an LSX based 400 with a 91 mm turbo would need to see more than 6,700. It seems to me that you're short shifting it.

g
 

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Discussion Starter #7
Like Hutch said, take it deeper (more rpm) before the shifts. I would think that an LSX based 400 with a 91 mm turbo would need to see more than 6,700. It seems to me that you're short shifting it.

g
well i need to go back to the dyno to see where the power falls off, the car is still a new setup and i could pull it higher in the Rpm i just wasnt sure. the cam is a speed inc turbo cam level 3. 588/588 lift 236/236 on a 112 i believe. how high would u guys spin it?
 

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well i need to go back to the dyno to see where the power falls off, the car is still a new setup and i could pull it higher in the Rpm i just wasnt sure. the cam is a speed inc turbo cam level 3. 588/588 lift 236/236 on a 112 i believe. how high would u guys spin it?
Don't believe the dyno, my junk lays over at 6300 rpm's on dyno. I have been shifting at 7200 with a drop to only 6900 thru the traps at 7200.

I do have more cam than you though.
 

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If I tried to shift my car at 6700, the shift lite would never go out.. Shifting at 7000 and it cruises thru the gears..

I also run a hydraulic roller..
 

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Wow, what are the glide guys seeing then?
With our 632 nitrous motor/glide combination in a 2,400# car we launch at 4,900-5,200 the converter grabs the motor at 6,200, wheel speed takes off then we shift at 7,600- 7,800, the engine falls to 7,200 - 7,400 rpm and we go through the traps at 7,800.

With that car we 60' 1.09 and run 4.70 @ 155 with a 24/20 pill in it. I mention that combination because if I turn both kits on we will most likely run right through the converter that's in the car now.

There's more to the equation than just the gear ratios. It is vehicle weight, horsepower, converter efficiency, transmission ratios and then axle axle ratios.

g
 

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is 7500 high for a hydraulic cam setup?
Yeah it is, but it's nothing outragous.. I turn about that much all the time..

Here what worked for me.. I ran springs that had 215 lbs on the seat.. I only used 1/8th turn of lifter pre-load.. And I used oil restricting pushrods..

The motor never had any lifter tap.. And when I pulled high gear, I just let the motor rev whatever it needed to cross the finish line.. I didn't worry about my hydraulic cam..

Next season I'll have a solid roller in the car.. It's should be running over 170..
 
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