Just curious. I'm thinking about getting a pristine one owner 87 Iroc-Z. It has 54,000 miles and is completely stock.

If I get it my first mod is going to be a Vigilante Torque convertor and some Drag Radials.

Any suggestions on Torque Convertors? I'm thinking a 2800 stall speed with a Stall Torque Ratio of around 2.5?

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1998 Z28
12.79 @ 110.29 - With no muffler, Drag Radials, and free mods (That's all!)
SAE Corrected 346rwhp 354rwtq with Mac Headers, UD Pulleys, B&B Triflow Catback, and Direct Flo Airlid

89 Taurus SHO

 

In a word......yes

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91 RS W/carbed 350, Vortec heads, performer rpm, Comp cams Xtreme energy 280 grind. BFG Drag radials. 3.42 posi,Corvette servoed 700r4, ****ty stock converter
13.24@104

 

vortecfcar - Just curious as to why. The torque peak on a stock L98 is around 3200 rpms so a 2800 Vigilante would let me launch right in the meat of the torque band would it not?

I want a minimum of 1.80 60fts.

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1998 Z28
12.79 @ 110.29 - With no muffler, Drag Radials, and free mods (That's all!)
SAE Corrected 346rwhp 354rwtq with Mac Headers, UD Pulleys, B&B Triflow Catback, and Direct Flo Airlid

89 Taurus SHO

 

It would work great at the strip. A little loose around town. It comes down to personal preference. Precision built me a 2600 RPM Vigilante based on the data I supplied. The car's a lot funner to drive compared to the stock TC. Sixty foot times improved from 2.08-2.16 to 1.89-1.99 but my posi is fried so these numbers are only for 1 wheel drive. Running solidly in the 1.8x range with good tires and fresh posi is easy.

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89 Formula 350, Accel Tri-Ys, 3" SLP, chip, Jacobs, SLP cold air, Probuilt tranny, Vigilante, 3.27s, Spohn torque arm & LCAs w/brackets, GW Subs

 

That is the converter I will be going with. 2800 is nice You are right, the IROC will be great with that stall. Most people think that would be to much, but your rithg, the L98 has a great power band around that RPM, so why not just launch right into that! I will be going with a 2800-3000 stall, but I plan on a 383 build up soon.

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25th Anniversary Z28

 

With that much slippage, you'll probably want an extra transmission cooler if you do much driving in traffic.

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1984 Silver Z28, 383 cid 4 bolt, ARP Fasteners, 2 1/2" Cowl Induction Hood, 600 cfm Performer Carburetor, Torker II Intake, Performer RPM Heads, XE268H Cam, Magnum Roller Tip Rockers, MSD6AL Ignition, Blaster2 Coil, Recurved HEI Distributor, 700R4, TransGo SK, 2.73:1 Limited Slip Dana 44, Terminator Headers, Custom 3" TIG Welded Stainless Exhaust, Flo-Pro Twister Muffler, 4 Wheel Disc Brakes, Oil Cooler

 

I am running the 2800 stall Vig and it is a beautiful converter. I don't notice the looseness on the street at all. One work of advise....

With the stock TPI setup and the 2800 vig there is no way that you will get traction around town ... but, you will be able to create a lot of tire smoke

Tim

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TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's after installing Hooker LT Headers and reducing weight.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org

 

It's good to hear from someone using a Vigilante 2800. This IROC would just be a project car for me so I'm not interested in using it for daily transportation. I would just want a hard launch at the strip on some sticky tires.



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1998 Z28 - 6-Speed
12.79 @ 110.29 (1.975 60ft) - With no muffler, Drag Radials, and free mods (That's all!)
SAE Corrected 346rwhp 354rwtq with Mac Headers, UD Pulleys, B&B Triflow Catback, and Direct Flo Airlid

89 Taurus SHO