4.3:1 vs 4.1:1
02-01-06, 04:34 PM
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4.3:1 vs 4.1:1
GTUs and Efini (4.3:1) vs all the rest (4.1:1)?
I am sure that this discussion has come up before, but I am curious as to what the major difference is with these two gear ratios when it comes to performace, and why did Mazda elect to give a 4.3:1 to both the GTUs and the Efini only?
I am interested in doing a Turbo swap into a GTUs and was wondering if I should swap out the rear ends or cruise around in the GTUs rear end?
Thanks
I am sure that this discussion has come up before, but I am curious as to what the major difference is with these two gear ratios when it comes to performace, and why did Mazda elect to give a 4.3:1 to both the GTUs and the Efini only?
I am interested in doing a Turbo swap into a GTUs and was wondering if I should swap out the rear ends or cruise around in the GTUs rear end?
Thanks
02-01-06, 04:40 PM
#2
Eats, Sleeps, Dreams Rotary
FYI, the higher the ratio, the better the acceleration, but the poorer the top speed.
The Infini and the GTUs would therefore have better get up and go, but a marginally decreased top end (due to the rev limiter in 5th gear being at a lower speed).
On the other hand, you don't want too high of a ratio on a car that has a lot of power, since you'll spin the tires, so a lower ratio is better for a car with lots of power, since you gain the benifit of a higher top speed.
You'll also have to shift more with a 4.3 than you would with a 4.1.
The Infini and the GTUs would therefore have better get up and go, but a marginally decreased top end (due to the rev limiter in 5th gear being at a lower speed).
On the other hand, you don't want too high of a ratio on a car that has a lot of power, since you'll spin the tires, so a lower ratio is better for a car with lots of power, since you gain the benifit of a higher top speed.
You'll also have to shift more with a 4.3 than you would with a 4.1.
02-01-06, 10:57 PM
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want the same effect for less money? find a pair of cheap 15" wheels, and put some short rubber on em'. Bam, shorter gearing; you can even get em' in "nice'n'sticky" formula and knock out 2 birds w/ 1 stone.
02-01-06, 11:08 PM
#5
Former Moderator. RIP Icemark.
According to Isao Tohda [his first production car], the GTUs was orginially supposed to get a Non Turbo 20B. When the gas consumption and costs to retool the cooling system came back, Mazda pulled the plug and instead tried to mask the lack of power with the 4.3 rear end.
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02-02-06, 03:21 AM
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Originally Posted by Icemark
According to Isao Tohda [his first production car], the GTUs was orginially supposed to get a Non Turbo 20B. When the gas consumption and costs to retool the cooling system came back, Mazda pulled the plug and instead tried to mask the lack of power with the 4.3 rear end.
So the 4.3 was obviously faster to redline, and had more getup and go than the 4.1...
So let's say I infact drop a 13BT and tranny into a GTUs, would it be better just to swap out the rear end also? I will not be running a factory motor and turbo. I will be using a t66 turbo or larger, and the motor will be ported as well, along with the usual goodies fmic, stand alone, etc. etc.. So with that kind of HP gain I really don't want to reach my redline any sooner than I have to?
02-02-06, 03:36 AM
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Well, with the 4.3, if you are going to 1/4 race it, will have a better time compared to the 4.1, but not much, but the 4.1 will have a higher top speed, but not much. The 4.3 will accelerate out of a corner slightly faster than the 4.1, but in all, there really isn't much of a difference. You can go either way, but leaving it in there would cost less. Why would you not want to hit redline as fast as possible? The faster you can reach it, the quicker the car will be through the gears as it is accelerating.
02-02-06, 10:59 AM
#11
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Originally Posted by Houstonderk
I wonder if there are a crap load of 20B's just siting around in solitude from this.
They would not have even started engine production if they hadn't got all the bugs out of the cooling system on the prototype cars.
But it does make me intrested in building a non turbo 9 port 20B
02-02-06, 11:24 AM
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Originally Posted by peacekeeper
Well, with the 4.3, if you are going to 1/4 race it, will have a better time compared to the 4.1, but not much, but the 4.1 will have a higher top speed, but not much. The 4.3 will accelerate out of a corner slightly faster than the 4.1, but in all, there really isn't much of a difference. You can go either way, but leaving it in there would cost less. Why would you not want to hit redline as fast as possible? The faster you can reach it, the quicker the car will be through the gears as it is accelerating.
I'm not sure why I wouldn't want to hit the redline faster? An oversight on my part. =0)
02-02-06, 11:24 AM
#13
Eats, Sleeps, Dreams Rotary
Supposedly, according to the Mazda tech at the local dealership (well, this is what he told my dad), there was a very limited production of suped-up second generation RX-7s that were sold I think only to dealer owners, and within a few weeks of them being sold, 75% of them had been wrecked... Including the one that belonged to the owner of this particular dealership!
Don't know whether that story has anything to do with it...
I personally think he's full of crap, though.
Don't know whether that story has anything to do with it...
I personally think he's full of crap, though.
02-02-06, 11:27 AM
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Originally Posted by Icemark
It is my understanding that the non turbo 20B never made it out of prototyping.
They would not have even started engine production if they hadn't got all the bugs out of the cooling system on the prototype cars.
But it does make me intrested in building a non turbo 9 port 20B
They would not have even started engine production if they hadn't got all the bugs out of the cooling system on the prototype cars.
But it does make me intrested in building a non turbo 9 port 20B
That answers the question about the 200hp N/A thread that's floating around!
02-02-06, 11:27 AM
#15
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Originally Posted by peacekeeper
Well, with the 4.3, if you are going to 1/4 race it, will have a better time compared to the 4.1, but not much, but the 4.1 will have a higher top speed, but not much. The 4.3 will accelerate out of a corner slightly faster than the 4.1, but in all, there really isn't much of a difference. You can go either way, but leaving it in there would cost less. Why would you not want to hit redline as fast as possible? The faster you can reach it, the quicker the car will be through the gears as it is accelerating.
02-02-06, 11:31 AM
#16
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Originally Posted by rotorforce
20B N/A would be a first. Go for it.
That answers the question about the 200hp N/A thread that's floating around!
That answers the question about the 200hp N/A thread that's floating around!
and 11 MPG
02-02-06, 12:22 PM
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Originally Posted by Icemark
Yeah, rough near stock estimates would put a non turbo 20B around 225 HP and 210 Ft/lbs
and 11 MPG
and 11 MPG
02-02-06, 04:42 PM
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Originally Posted by Valkyrie
FYI, the higher the ratio, the better the acceleration, but the poorer the top speed.
The Infini and the GTUs would therefore have better get up and go, but a marginally decreased top end (due to the rev limiter in 5th gear being at a lower speed).
On the other hand, you don't want too high of a ratio on a car that has a lot of power, since you'll spin the tires, so a lower ratio is better for a car with lots of power, since you gain the benifit of a higher top speed.
You'll also have to shift more with a 4.3 than you would with a 4.1.
The Infini and the GTUs would therefore have better get up and go, but a marginally decreased top end (due to the rev limiter in 5th gear being at a lower speed).
On the other hand, you don't want too high of a ratio on a car that has a lot of power, since you'll spin the tires, so a lower ratio is better for a car with lots of power, since you gain the benifit of a higher top speed.
You'll also have to shift more with a 4.3 than you would with a 4.1.
02-02-06, 06:45 PM
#21
Eats, Sleeps, Dreams Rotary
Originally Posted by drago86
Wait, whens the last time you saw a stock NA or even T2 hit the rev limit in 5th? (170+mph). Gas mileage might be affected but unless your pushing 350hp+ your not going to see the top of 5th.
