Carbed 350 with 700r4 high highway rpms
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Junior Member
Joined: Oct 2016
Posts: 41
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From: Corpus Christi, Texas
Car: 1988 Pontiac Firebird
Engine: 305 V8, TBI
Carbed 350 with 700r4 high highway rpms
Hi Gentlemen, I have been wondering for a while if there is a way to lower the rpms while at highway speeds of 60mph+. My setup is a carbed 350 with a 2 barrel Rochester and a 700r4. She shifts good but I remember before i got rid of the TBI (I know y’all are gonna give me flak for that) I remember at the same highways speeds of 60mph+, the rpms would be below 2000 and now the rpms are between 2000 and 2500. I’m just curious if it’s possible to lower it with maybe TV Cable adjustments or something.
Supreme Member
Joined: Oct 2004
Posts: 4,528
Likes: 240
From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: Carbed 350 with 700r4 high highway rpms
Before you modded the car did you remember to make provisions to allow the tq converter to lock up without the computer?
Thread Starter
Junior Member
Joined: Oct 2016
Posts: 41
Likes: 2
From: Corpus Christi, Texas
Car: 1988 Pontiac Firebird
Engine: 305 V8, TBI
Re: Carbed 350 with 700r4 high highway rpms
no sir I didn’t, cause I’ve ever done this before. Cause the tq locks up still. Isn’t that “fourth gear” on the transmissions? Because back when I first did this conversion to carburetor, it never would switch to Overdrive or “4th gear” until I extended the tv cable some.
Supreme Member
Joined: Oct 2004
Posts: 4,528
Likes: 240
From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: Carbed 350 with 700r4 high highway rpms
No. Fourth gear is fourth gear. Torque converter lock up is a completely separate entity
https://www.motor.com/magazine-summary/torque-converter-lock-may-1999/
https://www.motor.com/magazine-summary/torque-converter-lock-may-1999/
Thread Starter
Junior Member
Joined: Oct 2016
Posts: 41
Likes: 2
From: Corpus Christi, Texas
Car: 1988 Pontiac Firebird
Engine: 305 V8, TBI
Re: Carbed 350 with 700r4 high highway rpms
oh really. I’m haven’t really learned too much about this. Mind sharing with me your knowledge sir? And what should I do
Joined: Mar 2017
Posts: 4,255
Likes: 427
From: Portland, OR
Car: 86 Imponte Ruiner 450GT, 91 Formula
Engine: 350 Vortec, FIRST TPI, 325 RWHP
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
Re: Carbed 350 with 700r4 high highway rpms
Part of the consequences of removing the TBI (mistake, BTW), is that you no longer have the computer to handle TCC lockup. You need a kit for this such as:
https://www.summitracing.com/parts/prf-60109/overview/
GD
https://www.summitracing.com/parts/prf-60109/overview/
GD
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