From 3.90s to 3.27s....DAYUM! - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 66 Old 10-03-2011, 01:42 AM Thread Starter
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From 3.90s to 3.27s....DAYUM!

I've had the 3.90s a year or 2 before it was turbo'd and it was great. The llower rpm pull was sweet, but the topend was bottled up ( i didn't realize that til after the swap) and the turbo was doin work (i thought). I swapped gears yesterday and HOLY SHIZ. I was making 13.6psi with my T6 and now I hit 15 by 5k. I did not expect any of that. My car is way faster and the topend power is sweet.

Anybody thinking about the switch DO IT!



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post #2 of 66 Old 10-03-2011, 01:47 AM
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whats combo?


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post #3 of 66 Old 10-03-2011, 01:49 AM Thread Starter
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eddy 170s, t6, 302 15psi


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post #4 of 66 Old 10-03-2011, 04:09 AM
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The only data I care about is times. If u don't have actual data its hogwash

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post #5 of 66 Old 10-03-2011, 04:18 AM
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The only data I care about is times. If u don't have actual data its hogwash

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Really? They guy can't say that the car runs and pulls better than before? That is not good enough?

My car may NEVER hit the track. If I make a change and the seat of the pants and drivability improves my perception is hogwash too?
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post #6 of 66 Old 10-03-2011, 08:40 AM
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Really? They guy can't say that the car runs and pulls better than before? That is not good enough?

My car may NEVER hit the track. If I make a change and the seat of the pants and drivability improves my perception is hogwash too?
seeing how modifying a car predominately is to gain a performance advantage, yes i do want test information and the purest most rational way of determining whether what he did actually brought some sort gains the track times are key.

i dont go by butt meters but thats just me.

b4 i get the response go on ttf.com and search i have seen them but i do not agree with the logic at times. some people gained and some didnt.
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post #7 of 66 Old 10-03-2011, 10:35 AM
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Mine felt much better also when I went from 3.73s to 3.27s

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post #8 of 66 Old 10-03-2011, 10:54 AM
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Every one knows that a 3.27 is pretty much the all mighty turbo gear. If you doubt that there was any gain going from a 3.90 - 3.27 feel free to complete your own testing. Goat has stated previously that he does not go to the track. Besides his findings are exactly the same as everyone else that makes the switch.

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post #9 of 66 Old 10-03-2011, 11:31 AM
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Ur wrong on the same results search ttf.


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post #10 of 66 Old 10-03-2011, 12:00 PM
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Mine felt much better also when I went from 3.73s to 3.27s

Then get over here and swap mine already ...lol


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post #11 of 66 Old 10-03-2011, 12:12 PM
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Then get over here and swap mine already ...lol
Once you can handle my crossover fa' sho.
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post #12 of 66 Old 10-03-2011, 02:02 PM
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auto or 5 speed ?

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post #13 of 66 Old 10-03-2011, 02:53 PM Thread Starter
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nyctony if u want track time, go get some. I am giving my opinion/impression/honest feedback on my gear swap. I read the same stuff on TTF and only a few disagreed with the 'highway" gears. You are more than welcome to do ur own experiments. Good luck, good day and go fuk urself.


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post #14 of 66 Old 10-03-2011, 02:53 PM Thread Starter
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auto or 5 speed ?
T5 and I baby it...Muhahahahahaha


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post #15 of 66 Old 10-03-2011, 05:41 PM
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3.27s would definitely make a huge difference over 3.90s on a turbo car.

Did you notice a difference in spool time? I know you said it hits 15 at 5k now, but does it spool quicker in general?
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post #16 of 66 Old 10-03-2011, 05:53 PM
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nyctony if u want track time, go get some. I am giving my opinion/impression/honest feedback on my gear swap. I read the same stuff on TTF and only a few disagreed with the 'highway" gears. You are more than welcome to do ur own experiments. Good luck, good day and go fuk urself.
I agree. Keep your stupid comments to yourself.
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post #17 of 66 Old 10-03-2011, 07:57 PM
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funny that you made this post. as we speak, my car is in the shop now. swapping the 4.10's out to 3.27's

im tired of maxing out forth gear at track. 117 mph fastest she'll go in 4th (5-speed 3650)


i cant wait. i hope it makes a big difference!!!!!!!!!

if you feel a improvement from 3.90's i should feel a big difference from the 4.10's

also im running 10-11 psi through the turbo

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post #18 of 66 Old 10-03-2011, 08:11 PM
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funny that you made this post. as we speak, my car is in the shop now. swapping the 4.10's out to 3.27's

im tired of maxing out forth gear at track. 117 mph fastest she'll go in 4th (5-speed 3650)


i cant wait. i hope it makes a big difference!!!!!!!!!

if you feel a improvement from 3.90's i should feel a big difference from the 4.10's

also im running 10-11 psi through the turbo
like ive said many times in the past, its going to be like driving a completely different car. turbos are load dependant. 4:10s=no load

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post #19 of 66 Old 10-03-2011, 08:16 PM
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like ive said many times in the past, its going to be like driving a completely different car. turbos are load dependant. 4:10s=no load
yea i understand now. i just hope the motor doesn't blow now!!!!

maybe thats why mine has stayed alive on 10-11 psi !!!!!!!! lol


o well new motor is going in 2 weeks

going to track this Saturday!!!!!! hoping for mid 11's and not to have a hole in block!!!! lol

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post #20 of 66 Old 10-03-2011, 08:23 PM
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I havent even drove mine yet and i'm thinkin about swapping out my 3.55's to some
3.08's. I'm even considering some 2.73's
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post #21 of 66 Old 10-03-2011, 08:23 PM
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Let me know what you think about your gear swap I'm running pretty much the same setup with the new on3FF kit I put down 444/461 on 11# with 3.73
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post #22 of 66 Old 10-03-2011, 08:25 PM
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post #23 of 66 Old 10-03-2011, 08:28 PM
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Let me know what you think about your gear swap I'm running pretty much the same setup with the new on3FF kit I put down 444/461 on 11# with 3.73


ok will do. i should have car back Tuesday or Wednesday ill most likely start a thread.

because Saturday im going to track as well.

with 4.10's ----- best i could get was 12.04 @ 117 at 6-7 psi (hitting rev limiter in 4th b4 traps)

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post #24 of 66 Old 10-03-2011, 09:18 PM Thread Starter
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I havent even drove mine yet and i'm thinkin about swapping out my 3.55's to some
3.08's. I'm even considering some 2.73's
Keep the the 3.55s u will like them.


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post #25 of 66 Old 10-03-2011, 09:20 PM Thread Starter
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Nt sure on spool time really cause with the 3.90s u get the instant kick from the gears then the turbo pull kicks in, but with the 3.27s it feels more like all turbo pull when it spools. Spool time is about the same but boost is longer. I hope others can try to explain cause I know I'm not doing a good job of explaining.


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post #26 of 66 Old 10-03-2011, 09:23 PM
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do you guys think 308's with a c4 will be to much? i made 477whp and 502 wtq through a t5, what converter should i use?

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post #27 of 66 Old 10-03-2011, 09:36 PM
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Nt sure on spool time really cause with the 3.90s u get the instant kick from the gears then the turbo pull kicks in, but with the 3.27s it feels more like all turbo pull when it spools. Spool time is about the same but boost is longer. I hope others can try to explain cause I know I'm not doing a good job of explaining.
Oh I understand what you are saying. All the cars that I have worked on where it went to a taller gear was on an auto, so the spool time was a little skewed because of the converter and such. Just curious how it was with a manual. But I definitely know the feeling where it seems it just pulls FOREVER with the taller gears.
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post #28 of 66 Old 10-03-2011, 09:41 PM
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Keep the the 3.55s u will like them.
I dont know if the 3.55's will be tall enough.
I'm hope it mph's in the mid 150 range.
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post #29 of 66 Old 10-03-2011, 09:46 PM
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I dont know if the 3.55's will be tall enough.
I'm hope it mph's in the mid 150 range.
How tall of a tire and how high are you spinning the engine? What setup do you have?
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post #30 of 66 Old 10-03-2011, 10:05 PM
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I'm running a 26" tire and 4:10's and the first 3 gears seem to outrun the turbo. 4th to 6th really get some boost. The 3.27's are sitting in the garage staring at me now...

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post #31 of 66 Old 10-03-2011, 10:18 PM
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Nt sure on spool time really cause with the 3.90s u get the instant kick from the gears then the turbo pull kicks in, but with the 3.27s it feels more like all turbo pull when it spools. Spool time is about the same but boost is longer. I hope others can try to explain cause I know I'm not doing a good job of explaining.
The spool time shouldn't be any different. The big difference is in the first couple of gears. 3:90s you may have not seen boost till 3rd gear. With 3:73s I wouldn't see boost till the top of 2nd going into 3rd. Now it's boost in all gears. Turbo cars don't make power till the boost shows up. So why would you want a half powered car till 3rd gear in a race. Now with higher gears you won't climb the rpms so fast and will be in the boosted power band longer. It will also be easier around town driving.

It like this 3:90 may take 3seconds to rev up to 5k. But you also didn't see boost till 3rd maybe so that's only leaves you with two gears in a normal race which gives you 6 seconds of half power and 6 seconds of boosted power. Now with 3:27s you will get 4seconds till it reaches 5k. And boost in all gears. Now you get to use all boosted power for 16seconds in a race. Which it should be well over by then. They will make all the difference in the world.

Hope that makes sense. Goat I hope to see you on the 15th @C&S.

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post #32 of 66 Old 10-03-2011, 10:33 PM Thread Starter
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I saw 6+ psi in every gear with the 3.90s...I see more with the 3.27s though, BUT I run diesel turbos ONLY. They spool stupid fast and provide great air. My tv7701 is a 90mm turbo that spools like a 60mm.


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Last edited by goatnipples2002; 10-03-2011 at 10:38 PM.
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post #33 of 66 Old 10-03-2011, 11:42 PM
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like ive said many times in the past, its going to be like driving a completely different car. turbos are load dependant. 4:10s=no load
This i have known....

but i always wondered how imports can rev in neutral and get the BOV to go off

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post #34 of 66 Old 10-03-2011, 11:51 PM
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This i have known....

but i always wondered how imports can rev in neutral and get the BOV to go off
im assuming the size of the turbo.

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post #35 of 66 Old 10-03-2011, 11:52 PM
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but i always wondered how imports can rev in neutral and get the BOV to go off
well when the turbos are 25mm or so ...... lol

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