3.27 vs 3.55 - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 13 Old 09-05-2011, 12:57 PM Thread Starter
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3.27 vs 3.55

So I always see it's best to run lower numeric gears like 3.27 or 3.55 with a turbo. I'm planning on getting the Hellion single kit which comes with a 62mm. From the dyno graphs I have seen of the kit it makes full boost by ~3000rpm. One graph I saw was making over 400rwtq from 3250-5300ish and peaking at 530.

I'm curious as to what you guys would suggest gear wise, 3.27 or 3.55? The car is a 02 GT, 4r70w and 3600 stall.

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post #2 of 13 Old 09-05-2011, 02:04 PM
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with the same kit, 3:27s, and 62mm I saw 532whp/630wtq at 10.8psi


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post #3 of 13 Old 09-05-2011, 02:10 PM Thread Starter
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Not bad numbers

Maybe I should have been more clear. With the Hellion kit I will be running the stock block. I'm wondering what gears would be best for that setup (power level) and would get me down the track fastest.
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post #4 of 13 Old 09-07-2011, 09:56 AM Thread Starter
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After some searching around I think 3.55s might be better. Still open to suggestions from people with first hand experience.
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post #5 of 13 Old 09-08-2011, 12:38 AM
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I along with many run 3.27 and let the turbos do the work.

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post #6 of 13 Old 09-08-2011, 09:49 AM Thread Starter
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Why did you guys choose 3.27s over 3.55?
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post #7 of 13 Old 09-08-2011, 10:51 AM
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turbos are load dependant. 3:27=more load. I will be trying out 3:08s sometime in the future

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post #8 of 13 Old 09-08-2011, 12:55 PM
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My car was quicker with 3.27 and 27" tire than 26" tire. Then I ran a 28" tire and went even quicker.

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post #9 of 13 Old 09-08-2011, 07:16 PM Thread Starter
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Hmmm...I have 4.10s now so maybe I could swap my rear for my buddies 3.27 rear. That way it wouldn't cost me anything and I could see how I liked the 3.27s.
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post #10 of 13 Old 09-08-2011, 11:13 PM
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post #11 of 13 Old 09-10-2011, 09:32 PM
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I had a 355 and switched to a 327. It dropped the rpm on the big end a little. Lost alittle 60ft with the 327. Car ran about the same really. I liked the 355 better. On the street it felt better all around.

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post #12 of 13 Old 09-16-2011, 12:01 AM
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Typically as you go down numerically it puts more load on the motor and it gets easier to get the car to leave well.

Its not in every situation but the small advantages of more load, easier leaving, and better highway RPMs usually make less gear a better choice.

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post #13 of 13 Old 09-16-2011, 07:25 PM
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i chnaged from 373s to 331s and all i can say is WOW!

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