1/4 mile in 90+mph......how do you get it to shift into overdrive while flooring it?
 

this just hit me as i was thinkin bout how to make my car faster

is there a kit or something that would make it shift into overdrive at full throttle so you can do over 90 in the 1/4 mile??

cuz im sure must of you do more than that...and im just wonderin what i would have to get to b able to do that

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84TA T-tops L-69 305HO TH-700R4 stock 190hp and 240 ft-lbs.
new best E.T. (dont laugh) 15.986 @84.93mph
old best E.T 15.997@86.04
http://www.geocities.com/K_towngangsta

Mods-

K&N Air filter

Shifting into overdrive during the quarter mile will actually slow you down, unless you are running a really low gear in the rear like 4.11's or higher numerically. Even with that kind of rear gear I don't believe you will need to get into 4th gear (OD). B&M does make a valve for the trans that does enable you to shift into 4th gear at WOT. That's only for highway driving.

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1988 GTA 5.7L TPI Auto
355 ci. block,TPIS ZZ-9 Camshaft, SLP Headers, Borla Cat Back, B&M Holeshot 2400 Stall Converter, 3.73 Richmond Gears

"Why ride a stang when birds can fly?"

http://www.geocities.com/thegta

there is also a problem with hitting 4th gear with a lot of throttle, it doesn't oil very well. it can easily fail if you have any sort of power.
just leave it in third, it will only hit a high rpom for a moment before you lift.

later
tim

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91 Camaro RS-LO3,Auto
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What makes you think you can only hit 90 mph in third gear??? Even with 4.10s you can hit that or more. With 3.23s/3.42s you can reach 120 mph easy in the 1/4. Which would be enough mph for 11s so you're fine with 3rd gear unless you're running pretty crazy fast...

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Ray87Z
-Vortec headed 350.
86 IROC w/ a cammed 305 TPI.
Formerly Ray86IROC.
www.inter-scape.com/Ray

I've heard the tranny won't let you hit 4th at more than 3/4 throttle or something like that as a safety thing. The B4C police cars don't have that "feature". I think someone makes a bypass for it.

Trust me...you can hit well over 90mph in drive, Ive never had to shift my car into 4th at the track. Ill second what NJ speeder says about the full throttle 4th...I definately have fragged 2 700R4s by getting in very high speed street races and using 4th at WOT - yes I am a moron.

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91 RS W/carbed 350, Vortec heads, performer rpm, Comp cams Xtreme energy 224/230 duration and .477/.480 lift. BFG Drag radials. 3.42 posi,Corvette servoed 700r4, 3000rpm stall converter. Edelbrock TES, 3inch cat, flowmaster with single 2.5 inch exit.
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13.0 @ 107- N/A
12.5@ 117- 100HP Nitrous

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so you run your low 13's to high 12's in 3rd??

cuz i was shooting for high 13's with the engine build i wanna do so if you can do it then i guess i can

what RPM are you usually runnin when you are at the track when you cross the line??

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84TA T-tops L-69 305HO TH-700R4 stock 190hp and 240 ft-lbs.
new best E.T. (dont laugh) 15.986 @84.93mph
old best E.T 15.997@86.04
http://www.geocities.com/K_towngangsta

Mods-

K&N Air filter

mid 5000's on the 107 MPH
about 6000 on the 117 MPH

I've hit the rev limiter in third gear once at about 130 mph. You should not have a problem keeping it in 3rd.

My trans never has a problem shifting into 4th at speed on the highway. The trans was just rebuilt to stock specs a few months ago. Do the older ('85) 700r4's not have this feature?
I think your low trap speed is caused by low h.p. not bad gearing. Get some more h.p. you will have a higher trap speed.
peace