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Author
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Topic: How much ET is C4 worth over C6
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Jerry Piner
Gearhead Posts: 229
From: staunton, va
Registered: Dec 2001
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posted 03-28-2002 10:35 AM
  
I have a C6 behind my 351W and everyone keeps telling me to put a C4 in it that it will run faster. I was just curious as to just how much ET I would pick up in the 1/8 th and 1/4 mile with the C4.
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steve'66
Gearhead Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 03-28-2002 10:39 AM
I've heard over .3 reduction in et.SteveW
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Dave_C
Gearhead Posts: 1069
From: Gadsden, Al
Registered: Aug 99
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posted 03-28-2002 12:00 PM
I went the other way. Ran a C-4 and swapped to a C-6 in my 69. Cost me .12 sec in the 1/8. Not too bad. Figure about 1/2 of that was due to the weight. I weighed botht he C-4 and C-6 on the bathroom scales. Both were dry and no converter. The C-6 was 147 lbs. The C-4 was 105. 42 lbs difference.The C-4 was a stock unit with a shift kit. The C-6 was stock with a full manual reverse valve body.
Used the same converter with both (had it re-splined for the C-6) All that's behind me now anyway. Last year went to a Powerglide (known as the powerslide around these boards). Regardless of what it's called it goes rounds and wins money. Best move I've made on the car in a long time. Later, David Cole [This message has been edited by Dave_C (edited 03-28-2002).]
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Moneymaker
Administrator Posts: 27499
From: Lyons, IL, USA
Registered: May 99
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posted 03-28-2002 04:30 PM
Absolute fact it a minimum of two tenths. This is based on all things being equal. If Dave's converter was a bit off on his C-4 that might attribute his minimal decrease of only .12 (which is still a bunch).
We have back to backed them on dozens (literally) of cars over the years and seen from two tenths to a full second pick up by switching from a C-6 to a well prepped C-4 and appropriate converter.
Our current rolling test bed, the 89 GT P/SA convert picked up two tenths going from a JPT AOD with 2.75 low gear to a JPT C-4.  ------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link
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chips67
Gearhead Posts: 663
From: louisville, ky, usa
Registered: Jul 2001
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posted 03-28-2002 11:13 PM
ive seen c-4 live well behind built 460's. a friend has a 60's full body mercury with a 460/c4 and he runslow 7's and 6's on nawwwssss, or whatever its called. by the way, medical nitrous will work in your car, practically no difference at all. make friends with an anethesiologist today!------------------
67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.79 60ft. time.
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kid vishus
Gearhead Posts: 6590
From: middle of NC
Registered: Oct 2000
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posted 03-29-2002 12:51 PM
When I switched from my c6 with a generic off the shelf TCI convertor that was stalling aorund 4600 to the c4 with a custom built 5600 stall Coan convertor, I picked up 3 tenths in the 1/8 and right around half a second in the qrtr with the same motor.
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