Dccd
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DCCD- Top end ?
I've owned a wrx in the past and am considering getting a sti. This may be a dumb question but i am thinking about how AWD vehicles tend to be slower top end acceleration than other 2wd cars. Adjusting the DCCD to 35/65 or whatever, will that allow more top end acceleration instead of say 50/50 ? 
Last edited by miamiowns; Mar 23, 2004 at 01:12 PM.
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Someone has to know that awd vehicles are notorious for poor top end acceleration, say 70+ mph. Even though when i had my 02 rex i was barely able to beat a 3.5 altima from 70-120, i mean 1/4 car length. Bone stock. Awd's have a bad rep for being slow top end. So I'm just asking if changing the ratio to more power to the rear will increase more top end acceleration hence the car acting more like a 2wd vehicle but still awd. Opinions? LET ME HAVE IT !!! lolz
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Joined: Apr 2003
Posts: 1,019
From: LIC Motorsports
Car Info: 2004 Black/Gold STi
Somone told me that the JDM STi has a thing where once the car is at a certain speed it automatically sets the the DCCD to 100% to the rear. Not sure how much validity this holds but its a great idea.
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That would kick azzz. It would be lovely if the ratio gradually did that as the speed increases. If you could set it up that way also, but it is still good as far as handling to have some awd goin on. It would be nice to be able to have an option like that. Top end acceleration would definetly improve !
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I would think that having more power delivered towards the rear or front to act more like a 2wd car would improve top end acceleration. Why you think awd stock vehicles get walked on by less powerful 2wd vehicles at high speeds? It's a proven fact. AWD is slower. Everyone knows this. 
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Joined: Aug 2003
Posts: 113
Car Info: Blue STi +Red del Sol VTEC
Setting the diff in the open mode green circle at the bottom is faster. It 's higher than 65%. The skyline goes completely rwd when at speed so it is very possible that the JDM STi does. I'm going to have to research that now. But either way someone should try to figure it out any electrical engineers on here.
Subaru AWD never does 100% RWD, its Nissan's ATTESA system that does.
I never heard AWD hurts top speed. I think it's the aerodynamics of the Impreza, which is very bad.
Porsche Turbo is AWD and so is Lamboroghini Diablo SV.
It's true that there is not much advantage of AWD in top speed straight road, though.
I never heard AWD hurts top speed. I think it's the aerodynamics of the Impreza, which is very bad.
Porsche Turbo is AWD and so is Lamboroghini Diablo SV.
It's true that there is not much advantage of AWD in top speed straight road, though.
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im talkin straight line accel, of course awd might be better for handling at high speeds, but 2wd is quicker. AWD=quicker acceleration off line, 2wd=quicker top end. I remember my 02 wrx gettin taken on the freeway by 2wd less powerful cars. sux. But what i expected. Why i brought up the fact of more power distributed to a single axle instead of equal to both. I mean my stock wrx basically got slowly beaten by a 3.5 altima. awd is not good for top end accel. i mean look at the #'s for the sti. I think from 60-110 it's like 11 seconds.
you also need to realize that 3.5 Altima has more power and torque than your stock WRX.
Altima = 250hp, 246lb-ft torque, 3200lb
WRX = 227hp,217lb-ft of torque, 3085lb
no suprise that altima can beat your WRX..
Altima = 250hp, 246lb-ft torque, 3200lb
WRX = 227hp,217lb-ft of torque, 3085lb
no suprise that altima can beat your WRX..
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The concept of the whole dccd placing all the power into the rear wheels is kinda like infiniti's intelligent awd. its rear wheel till it starts to slip and then it turns on awd. thats a decent idea in my opinion but i rather have the awd on for sure from a stand still and then turn on the rear wheels. if the sti was able to place power into the rear wheels like the skyline then it would be a flawless work or art. but then again i am in love with the car anyway.
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