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Different rear subframe and suspension? #1620077
07/05/2018 19:16
07/05/2018 19:16
Joined: Oct 2010
Posts: 546
Bulgaria
Ferrarist Offline OP
Enjoying the ride
Ferrarist  Offline OP
Enjoying the ride

Joined: Oct 2010
Posts: 546
Bulgaria
Sitting under car cover for 3 years, my Coupe recently told me that having two 20VT engines ready to be fitted, it's a crime if i did not fit him one, and drive it again.
OK, i said, but you're little bit too heavy and weighty car, and i'm eager to shave few kg's from your body.....and i will start from your rear end.
So - i'm planning to remove entire rear subframe, suspension, fuel tank, and fit one from Alfa 156.....
Pros - weight.....can save a lot...A LOT.....it's toe in-out and can be easily made to be camber adjustable.....
Cons - few cuts here and there, some welding as well, new alloy fuel tank, which is my last problem. Do the job by myself so no labor.
Anyone did something before?


20VT - Alfa 156 2.0 - Alfa 156 Mid-Engined RWD - Locost 20VT

Re: Different rear subframe and suspension? [Re: Ferrarist] #1620137
08/05/2018 17:02
08/05/2018 17:02
Joined: Oct 2008
Posts: 6,540
In the coupe.
magooagain Offline
Club Member 259
magooagain  Offline
Club Member 259
Forum is my life

Joined: Oct 2008
Posts: 6,540
In the coupe.
Search in the tuning section for. Gtv rear subframe.



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Re: Different rear subframe and suspension? [Re: Ferrarist] #1620138
08/05/2018 17:03
08/05/2018 17:03
Joined: Oct 2008
Posts: 6,540
In the coupe.
magooagain Offline
Club Member 259
magooagain  Offline
Club Member 259
Forum is my life

Joined: Oct 2008
Posts: 6,540
In the coupe.



Waiting for forum photo hosting!
Re: Different rear subframe and suspension? [Re: Ferrarist] #1620146
08/05/2018 18:14
08/05/2018 18:14
Joined: Oct 2010
Posts: 546
Bulgaria
Ferrarist Offline OP
Enjoying the ride
Ferrarist  Offline OP
Enjoying the ride

Joined: Oct 2010
Posts: 546
Bulgaria
Yeah, friend of mine did a similar project, it's a trackday car and i even drove few laps.....i may sound rude, but i don't like it....bit complicated, and still heavy.....


20VT - Alfa 156 2.0 - Alfa 156 Mid-Engined RWD - Locost 20VT

Re: Different rear subframe and suspension? [Re: Ferrarist] #1620222
09/05/2018 15:30
09/05/2018 15:30
Joined: Apr 2014
Posts: 209
norwich
sharman Offline
Making a profit
sharman  Offline
Making a profit

Joined: Apr 2014
Posts: 209
norwich
From what I've read the gtv rear suspension is superior for handling, being multi link it keeps the wheel base constant as the suspension compresses. But the penalty is As you say, it's complex and weighs more. Just my thoughts, with the 20v coupes being so front heavy to start with , would lightening the rear end even more be wise?

Re: Different rear subframe and suspension? [Re: sharman] #1620232
09/05/2018 18:13
09/05/2018 18:13
Joined: Dec 2005
Posts: 3,080
S. Wales. Way beyond my means
Gripped Offline
I need some sleep
Gripped  Offline
I need some sleep

Joined: Dec 2005
Posts: 3,080
S. Wales. Way beyond my means
Originally Posted By sharman
Just my thoughts, with the 20v coupes being so front heavy to start with , would lightening the rear end even more be wise?


That was my thought too. You'd have to lighten up the front too. Having done two track days, I noted that the rear can be twitchy. I'm not sure what the weight distribution is on the Coupe. Maybe 60:40 Front bias?


[Linked Image]
Re: Different rear subframe and suspension? [Re: Ferrarist] #1620258
10/05/2018 10:24
10/05/2018 10:24
Joined: Dec 2005
Posts: 17,041
Staffordshire
Nigel Online sleepy
Club member 123
Nigel  Online Sleepy
Club member 123
Forum veteran

Joined: Dec 2005
Posts: 17,041
Staffordshire
20vt weight distribution is about 2/3 - 1/3, front to rear.

Taking weight from the rear end should only be a consideration after you’ve taken a fair bit off the front (imho, of course)


[Linked Image]
Re: Different rear subframe and suspension? [Re: Ferrarist] #1620267
10/05/2018 14:13
10/05/2018 14:13
Joined: Oct 2010
Posts: 546
Bulgaria
Ferrarist Offline OP
Enjoying the ride
Ferrarist  Offline OP
Enjoying the ride

Joined: Oct 2010
Posts: 546
Bulgaria
Removing weight is always benefit, no matter front or rear balance affected. Overall laptime or 0-400 is better when weigh less. Since you select first gear and release clutch - less weight always better......
Handling will be affected, but can be corrected way too easy than hassle of removing weight.....2-3 cm wider rear tires is easiest way.....
Fiberglass front bonnet, battery moved and we can have 30kg lighter front end.


20VT - Alfa 156 2.0 - Alfa 156 Mid-Engined RWD - Locost 20VT

Re: Different rear subframe and suspension? [Re: Ferrarist] #1620272
10/05/2018 15:33
10/05/2018 15:33
Joined: Apr 2014
Posts: 66
Norway
ePiFaNT Offline
Club member 1413
ePiFaNT  Offline
Club member 1413
Reaping the fruits

Joined: Apr 2014
Posts: 66
Norway
Use this battery, and you'll save even more weight:

https://www.ev-power.eu/LiFeYPO4-batteries-12V-1-1/Lithium-Battery-LiFePO4-12V-20Ah.html

click to enlarge click to enlarge click to enlarge

If you remove the plastic housing, the 4 individual cells can be rearranged to mount as low and flat as possible. LiFePO4 is a safe chemistry, not prone to explosive fires like their LiPo cousins.

I used one for more than a season without any complications, but managed to forget about it while the car stood for some time and so went tits up... now measures between 2 and 3 volts on my Fluke frown

Re: Different rear subframe and suspension? [Re: ePiFaNT] #1620282
10/05/2018 18:17
10/05/2018 18:17
Joined: Oct 2010
Posts: 546
Bulgaria
Ferrarist Offline OP
Enjoying the ride
Ferrarist  Offline OP
Enjoying the ride

Joined: Oct 2010
Posts: 546
Bulgaria
I'm already using this type batteries on my V6 engined trackday 156's, it can start 6 cyl engine many times with no problems, so 5 pot will be even easier......
click to enlarge


20VT - Alfa 156 2.0 - Alfa 156 Mid-Engined RWD - Locost 20VT

Re: Different rear subframe and suspension? [Re: Ferrarist] #1621748
12/06/2018 06:39
12/06/2018 06:39
Joined: Nov 2011
Posts: 122
Sofia, Bulgaria
digitalundgrd Offline
On a journey
digitalundgrd  Offline
On a journey

Joined: Nov 2011
Posts: 122
Sofia, Bulgaria
We (me and injekciona) have fiber glass mold for the front bonnet. The problem is that this thing is quite large and brittle for bulgarian dispatch "killers" like ECONT or SPEEDY -> not transport friendly smile If you have some kind of pick up truck you can take it wink


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