anyone running 3.73s ???
I've got them on mine. Started car for first time last week. Having my IAT sensor bung welded up tomorrow night. Hoping to start tuning come this weekend. Check with me then and I'll let you know. My prediction is smoke show.
9 Second Truck Club
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From: Colorado Springs, Co/ Central, Ca
I run 3.73's in my 4850 lb truck and love them in there but would not go that low in anything under 4500 lbs with a 3-4 speed. I run 3.23's and a glide in my car.
I m running 4.10 (what the rear had) with my m6. I m going to switch to 3.42 though. I personally think too tall is better than too short in a turbo car. Atleast a tall gear can load the turbo/motor. Auto is a little different of a story... Good luck though
TECH Regular
Joined: Dec 2003
Posts: 405
Likes: 1
From: SOFLO
I had 3.70's, 4L80E, and a 26.10 tall tire on my Whipple'd car.
I could skate the car around, at will, below ~50mph. This was with a Yank SC3000 and the instant boost of a Whipple though. I felt it turned to many RPM on the highway at 75. Lots of interstate driving in my area.
Got rid of the Whipple for a turbo and swapped gears to a 3.50. My next tire is going to be a set of 28" tall units for the street.
Gears are like anything else, a compromise. Figure out what you can live with and what you cannot live without then decide.
I could skate the car around, at will, below ~50mph. This was with a Yank SC3000 and the instant boost of a Whipple though. I felt it turned to many RPM on the highway at 75. Lots of interstate driving in my area.
Got rid of the Whipple for a turbo and swapped gears to a 3.50. My next tire is going to be a set of 28" tall units for the street.
Gears are like anything else, a compromise. Figure out what you can live with and what you cannot live without then decide.
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I had 3.70's, 4L80E, and a 26.10 tall tire on my Whipple'd car.
I could skate the car around, at will, below ~50mph. This was with a Yank SC3000 and the instant boost of a Whipple though. I felt it turned to many RPM on the highway at 75. Lots of interstate driving in my area.
Got rid of the Whipple for a turbo and swapped gears to a 3.50. My next tire is going to be a set of 28" tall units for the street.
Gears are like anything else, a compromise. Figure out what you can live with and what you cannot live without then decide.
I could skate the car around, at will, below ~50mph. This was with a Yank SC3000 and the instant boost of a Whipple though. I felt it turned to many RPM on the highway at 75. Lots of interstate driving in my area.
Got rid of the Whipple for a turbo and swapped gears to a 3.50. My next tire is going to be a set of 28" tall units for the street.
Gears are like anything else, a compromise. Figure out what you can live with and what you cannot live without then decide.
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9 Second Club
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From: Joliet,IL and Las Vegas 50/50
Had 3.73's on a 26" tire on my car and ran out of gear going through the traps. My rev limit was around 6200rpm though and would hit about 137isjh. I since have gone with 3.54's on a 28" tire and upped my rev limit. I believe I'm good for somewhere in the neighborhood of 150-155 now
Staging Lane
Joined: Oct 2013
Posts: 77
Likes: 0
Axle Ratio (Diameter/340) X (RPM/Ratio)= MPH
Use 355 for non locked automatics.
Switch MPH and Ratio if you need the answer that way.
Never failed since I memorized it from the Direct Connection Chassis Book in about 1981. That and the Formula for CID saved my *** in high school geometry when the mean *** teacher we had wanted to know what relevance that car junk had in her class. Never forgot that one either...
B x B x Stroke x 8 (number of cylinders) x .7854 = cid
That truck with 33's is going to need some leverage to get moving. Start with 4.56 and play with your expected MPH / HP
Use 355 for non locked automatics.
Switch MPH and Ratio if you need the answer that way.
Never failed since I memorized it from the Direct Connection Chassis Book in about 1981. That and the Formula for CID saved my *** in high school geometry when the mean *** teacher we had wanted to know what relevance that car junk had in her class. Never forgot that one either...
B x B x Stroke x 8 (number of cylinders) x .7854 = cid
That truck with 33's is going to need some leverage to get moving. Start with 4.56 and play with your expected MPH / HP
Staging Lane
Joined: Oct 2013
Posts: 77
Likes: 0
(Diameter/340) X (RPM/Ratio)= MPH
Use 355 for non locked automatics.
Switch MPH and Ratio if you need the answer that way.
Never failed since I memorized it from the Direct Connection Chassis Book in about 1981. That and the Formula for CID saved my *** in high school geometry when the mean *** teacher we had wanted to know what relevance that car junk had in her class. Never forgot that one either...
B x B x Stroke x 8 (number of cylinders) x .7854 = cid
That truck with 33's is going to need some leverage to get moving. Start with 4.56 and play with your expected MPH / HP
Use 355 for non locked automatics.
Switch MPH and Ratio if you need the answer that way.
Never failed since I memorized it from the Direct Connection Chassis Book in about 1981. That and the Formula for CID saved my *** in high school geometry when the mean *** teacher we had wanted to know what relevance that car junk had in her class. Never forgot that one either...
B x B x Stroke x 8 (number of cylinders) x .7854 = cid
That truck with 33's is going to need some leverage to get moving. Start with 4.56 and play with your expected MPH / HP
Building a daily driver with very little track time, maybe.
Gearing Doing it comparing to my set up, you would be geared about like a 3.42 car with a 25.5 tire. Go from there on what you want to lean toward. I'd be surprised if you can trust a 3600# street weight on that build.
With a turbo engine and your desired purpose, I would back the gear down to 4.10 to 4.30 and put a really good lock up converter. If you put some slicks on it later, buy 32's or 31.5's not only a better gear multiplication but 33's tend to be made for ultra light stuff in the slick world. RED's, Roadsters, and tube chassis door slammers.
With a turbo engine and your desired purpose, I would back the gear down to 4.10 to 4.30 and put a really good lock up converter. If you put some slicks on it later, buy 32's or 31.5's not only a better gear multiplication but 33's tend to be made for ultra light stuff in the slick world. RED's, Roadsters, and tube chassis door slammers.
Staging Lane
Joined: Oct 2013
Posts: 77
Likes: 0
9 Second Truck Club
iTrader: (17)
Joined: Sep 2006
Posts: 3,672
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From: Colorado Springs, Co/ Central, Ca