Locking the converter to dyno

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08-23-2001, 04:48 PM

98_1LE

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Locking the converter to dyno

Is it easy to lock the converter as to get a more accurate dyno on a TPI car? Details appreciated? Also, any guesses on what my L98 with ported plenum, 160 stat, Hypertech Thermomaster chip and SLP 2OTL muffler will dyno? Best run is 13.94@96.67. I am thinking about 300 ft/lb torque and 200 peak rwhp, but could be way off.

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87 Formula 350 13.94@96.67
98 Z28 1LE 13.15@107.59
1LE Owners Association

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08-23-2001, 05:19 PM

Z28DJP1987

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Locking the TC will not make a difference.
Dyno run made on my car in 3rd, see below.

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1987 Black Camaro IROC-Z (original owner) Replaced LB9 @ 86100 miles.
New 350 Crate engine
Balanced & blueprinted
WP 67cc Heads 9.6:1 C.R.
Cam: 454lift,216dur@50,110ls
TPI Induction(from 305)
22# Fuel Injectors,AFPR&Gage
SLP Intake runners
New GM 1988 chip
K&N filters & Air Foil
Hothkis STB
SLP 1 3/4 Headers
CATCO 3" Catalytic conv.
SLP 3" Cat Back Exhaust
700R4 Auto
SLP Torque Converter (2400 stall)
B-W 9 bolt rear 2:77 Possi. Four wheel disc brakes,245/45/ZR-17 Tires
17x8.5 ATI 5 Razze Wheels
Dyno results: 211 RWHP & 282 RWTQ.
264 HP & 352#/ft at flywheel. NEW TOY

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08-23-2001, 05:46 PM

RCR

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Car: '84 Fiero ('01 GA interior)

Engine: '96 4.0 Aurora

Transmission: '96 4T80E

I ran mine locked. I figured it couldn't hurt, and it prevents the TC from slipping under the stall speed. I'm running a 2700RPM Vigalante.

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08-23-2001, 11:06 PM

drive it

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Quote:

<font face="Verdana, Arial" size="2">Originally posted by RCR:
I ran mine locked. I figured it couldn't hurt, and it prevents the TC from slipping under the stall speed. I'm running a 2700RPM Vigalante. </font>

I've always wondered 'bout that too. Anyone done a comparison with and without locked during the same dyno sesion with the same car??????

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86 406

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08-24-2001, 08:09 AM

Mista

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Car: 1986 Trans Am

Engine: 305 TPI peanut cam

Transmission: 700R4

ALDL and a jumper wire is all that is needed.

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86 T/A 5.0 A4 & 2.77 gear
15.62 @ 86 mph
93 Civic 1.6L
13.5 @ 100 mph

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08-24-2001, 10:46 AM

Ed Maher

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Car: 04 GTO

Engine: LS1

Transmission: M12 T56

Yeah, easy to do, a paperclip across ALDL A and F (top right and left terminals.)
As for results, scientifically you really should see at leasta few % gain across the board w/ it locked as converter slip happens at all rpms, even off the top where they get close to no slip. And any slip in the TC means heat is being generated. And if heat is being generated, that energy is coming from somewhere, there is no free lunch. Energy spent making heat in the tranny is energy you could have set to the rear wheels instead. Rate of energy delivery equals power, so if you are sending more energy to the rear wheels, you are making more power per unit time.
The universe is whole after all.