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Author Topic:   Top end timing retard?
Mike_R
Gearhead

Posts: 150
From: Indianapolis, IN 46237
Registered: Feb 2001

posted 06-28-2001 03:59 PM     Click Here to See the Profile for Mike_R   Click Here to Email Mike_R     Edit/Delete Message   Reply w/Quote
Has anybody out there tried running a top end timing retard? If so, does it really help MPH ? I'm wondering how much retard and at what RPM it should kick in. It's a naturally aspirated 460 stick shift that peaks around 6500 RPM.

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Butch Jennings
Gearhead

Posts: 577
From: No. California
Registered: Apr 2000

posted 06-28-2001 08:13 PM     Click Here to See the Profile for Butch Jennings   Click Here to Email Butch Jennings     Edit/Delete Message   Reply w/Quote

I just tried it last time out....didn't help the car at all. But in all fairness, it was really hot and the car was a bit fat. I jetted down and pulled the retard chip out and the car stepped right back up, I ran out of time and didn't get a chance to try pulling the timing out again after the jet change.

I'm going to Sacramento for a test and tune tomorrow night, if I get a chance to try it again I'll let you know what I find.

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Butch
460 powered 1967 Comet Cyclone
10.271 @ 130.069
Butcher's Home Page
"Friends don't let friends drive Chevys"

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kid vishus
Gearhead

Posts: 4357
From: middle of NC
Registered: Oct 2000

posted 06-28-2001 11:12 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
I know of a couple of guys I used to race with that used a top end timing retard and it really helpd them. But they both ran small blocks (chebies )that more than likely had a lot of timing in them to start with.

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Butch Jennings
Gearhead

Posts: 577
From: No. California
Registered: Apr 2000

posted 06-28-2001 11:18 PM     Click Here to See the Profile for Butch Jennings   Click Here to Email Butch Jennings     Edit/Delete Message   Reply w/Quote

That's a good point Kid, I usually don't run more than 38 degrees in mine. I might try 40 or 42 and pull 4 out tomorrow if I get enough laps in.

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Butch
460 powered 1967 Comet Cyclone
10.271 @ 130.069
Butcher's Home Page
"Friends don't let friends drive Chevys"

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Mike_R
Gearhead

Posts: 150
From: Indianapolis, IN 46237
Registered: Feb 2001

posted 06-29-2001 08:19 AM     Click Here to See the Profile for Mike_R   Click Here to Email Mike_R     Edit/Delete Message   Reply w/Quote
Thanks guys, let me know how it goes Butch.

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Butch Jennings
Gearhead

Posts: 577
From: No. California
Registered: Apr 2000

posted 06-30-2001 04:48 AM     Click Here to See the Profile for Butch Jennings   Click Here to Email Butch Jennings     Edit/Delete Message   Reply w/Quote

I made a few passes tonight....none of them very impressive, but I did try pulling some timing out and it neither helped nor hurt, it ran the same mph within .03. I did learn that my 460 doesn't like 2 dominators

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Butch
460 powered 1967 Comet Cyclone
10.271 @ 130.069
Butcher's Home Page
"Friends don't let friends drive Chevys"

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Moneymaker
Administrator

Posts: 19686
From: Lyons, IL, USA
Registered: May 99

posted 07-02-2001 10:14 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
I have tested a 2-4-6 and 8 degree retard on MM on several occasions with absolutly no improvment. Actually we had a loss with the 8 degree chip. We have also over the last few years tested them on all other FoMoCo series engines with the same results. 289-351W's like 35 degrees and FE's, C heads and 385 series like 38 and better. That's it.

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Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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