Hot Rod Forum : Hotrodders Bulletin Board - Reply to Topic
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> Torque convertor advice
User Name
Password
lost password?   |   register now

Thread: Torque convertor advice Reply to Thread
Title:
  
Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Additional Options
Miscellaneous Options

Topic Review (Newest First)
01-15-2013 02:12 PM
vinniekq2 At 2500 RPM you are at 75% of your maximum torque. If you race,then use a higher stall speed.With small tires,you do not need as much converter,especially the shorter tires you are driving on the streets.
01-15-2013 02:03 PM
F-BIRD'88 The smaller the engine CID the more critical the torque converter choice is.
01-15-2013 02:00 PM
F-BIRD'88 Here is the Fbird88 method of street strip torque converter selection.
Based on 35+ years experience and looking at the engine torque-power curve.
This is for a street strip car,,, not full race.

For street strip a good target area is the blue point.
The minimum stall for good street performance with that cam is the lower Red arrow
which indiates the lower point of equal engine torque from the peak horsepower point.
You really don;t want a real stall speed less than this, unless you are a real wimp.

Full balls out race you want the stall speed right at or even a bit higher than the peak torque point.

This happens to be a dyno test graph of a 5.0L ford with the E303 cam in it....so.....
01-15-2013 01:20 PM
F-BIRD'88 Find a engine dyno test of a 302 ford engine using the E303 camshaft. Look on the dyno test to see
the RPM point that peak engine torque occurs. Pick a stall speed that is 500-700 rpm belows that point.

so if peak torque occurs at 4000 rpm get a tork converter that creates a 3200-3500 real max stall speed when used on a 302CID motor.

The advertized stall speed may not be the real stall speed as the stall speed you are going to get is relative to engine torque input. A bigger 347 or 351 CID will see a higher stall than a 302 with the same torque converter.
Therfore is is very common to come up short on real stall speed behind small CID engines.
So before you buy the torque converter for your 302. CALL THE MANUFaCTURER.
They will advise you on the real stall speed you will get behind a 302 with any one converter.
That way you will get it right the first time.

A high stall converter is pretty tame when in a light weight car. So don;t be shy on stall.
You want the stall well up on the engine torque curve at launch.
302's need stiff gears too, especialy when cammed.

Th E303 cam is really intended for a 5 speed manual trans car. So when using with a auto transmission it may benefit from a bit of camshaft advance to build engine torque. More torque is better, with a auto transmission. Especially if the engine is a little soft on compression ratio. On a 302Ford its a real good idea to verify valve to piston clearance when ever messing the camshaft advance-retard phasing adjustment.

Again... if you want to get it right the first time call the converter manufacturer so you get the converter stall you need, from a off the shelf high stall converter. The phone call can make the difference between getting the right and wrong torque converter.
01-15-2013 01:05 PM
cobalt327 A converter will stall lower in a lighter vehicle than a heavier vehicle, all else being equal.

My recommendation is conservative if anything (what do you think FB88 would recommend ).
01-15-2013 12:44 PM
vinniekq2 2500-3000 is a lot of converter for a light street car that gets driven a lot.
01-14-2013 10:23 PM
cobalt327
Quote:
Originally Posted by V8 Juggernaut View Post
PLEASE NOTE: This is and will be a street car, not a race/drag car.
Welcome to Hotrodders!

3K rpm stall. I'd seriously consider the 3.70s, too. Add an axillary cooler if you don't already have one.

The distributor will need a performance curve in it.

Good luck.
01-14-2013 10:12 PM
V8 Juggernaut
Torque convertor advice

Okay, here's what I've got: 5.0 out of a 96 Explorer, Ford Racing E-303 cam and lifters, Trick Flow Specialties valve spring kit, Edelbrock Performer RPM intake and Edelbrock 1404 carb. The transmission is a C-4 out of a 77 Thunderbird rebuilt with a shift kit. Rearend is a 9" with 3.50 gears currently (I have a set of 3.70's too). The tire size is 205/60/15 with a height of about 24.5" tall. This combo is in a 62 Falcon which will weigh in the neighborhood of 2400-2500 lbs when done.

PLEASE NOTE: This is and will be a street car, not a race/drag car. Of course I won't mind laying some black strips now and again. So, I don't need some exotic built torque convertor, just an off the shelf convertor that I'll probably buy from Jegs or Summit. With that being said, what would be a good stall speed to look for with this combo? Thanks in advance for your help.


P.S. Not trying to be a smart-*** with the exotic convertor thing, but I have gotten some pretty crazy recommendations from other sources and I just need a short and sweet suggestion.

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -6. The time now is 05:15 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.