Roscoe
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| posted on 21/9/06 at 02:52 PM |
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Invoard or outboard
Hi Guys,
This is my first post here. BAckground is I have recently moved to manila and left my project behind (mk1 escort to group 4 spec) Board and desperate
for a project I am looking it importing a MNR. (help and service so far has been great)
Anyway the car will be used for weekend fun and track days. oging R1 route but should I go for inboard suspension. Does it make a noticable
difference.
Also do I need an LSD as I have been quoted for a non lsd (ps I am buying complete kit [everything] as parts are hard tosource over here so I need to
get my spec right upfront)
Sure this will be the first of many posts!
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G.Man
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| posted on 21/9/06 at 05:05 PM |
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LSD is great if you want to do big powerslides... so well worth it for throttle steering..
Inboard suspension is rising rate, so gives better handling than outboard suspension... definately worth it to keep the shocks protected as well...
Spend the money now and you wont regret it
Opinions are like backsides..
Everyone has one, nobody wants to hear it and only other peoples stink!
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peterriley2
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| posted on 21/9/06 at 05:11 PM |
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the inboard suspension is supposed to cut down on drag, to what extent i couldnt tell you... to be honest i reckon it'll be pretty similar to
the outboard, and i guess it weighs more as there is more metal involved (depends how anal you want to be ).it really boils down to a choice of what
fo you think looks better- with suspension coming out, or having it all tucked away inside.
the lsd thing, if your going to get really competitive on track, its probably best to have an lsd, but th sierra ones dont work that well anyway (in
comparison), and kit cars handle great on track with or without one. also keep in mind that lsd's weigh about 10kg's more than open diffs.
depending on how much money you have to spend, id just say both these things only will make a small difference, and personally id keep the weight down
as that will sure help with handling a lot.
hope that helps
Joel
If you dont respect yourself, dont expect respect from anyone else
Live your dreams, dont dream your life
Women only want you for one thing- everything!
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G.Man
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| posted on 21/9/06 at 05:58 PM |
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Peter
I think you need to read up on rising rate suspension my friend...
Inboard rising rate suspension is designed using cantilevers to increase the resistance of the suspension as it compresses further, thereby making it
stiffer and allowing the use of a softer spring for short travels...
This makes the suspension compliant over small bumps, but stiff under hard braking or cornering...
It has nothing to do with reducing drag...
Outboard suspension is falling rate, due to the geometry and gets softer the more in compresses, meaning increased requirements for anti roll bars and
stiffer springs thereby giving a harsher ride..
Opinions are like backsides..
Everyone has one, nobody wants to hear it and only other peoples stink!
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Jon Ison
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| posted on 21/9/06 at 06:05 PM |
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I think the fact you haven't got two shocks/springs exposed in the airflow is his reasoning behind losing a bit of drag. Read "a
bit" ie, a velly small bit.
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G.Man
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| posted on 21/9/06 at 06:11 PM |
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quote:
Originally posted by Jon Ison
I think the fact you haven't got two shocks/springs exposed in the airflow is his reasoning behind losing a bit of drag. Read "a
bit" ie, a velly small bit.
Yeah I suppose on an F1 car it has that effect, on the front of a 7 I would imagine its negligible, as they are already as aerodynamic as an average
housebrick
Opinions are like backsides..
Everyone has one, nobody wants to hear it and only other peoples stink!
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Jon Ison
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| posted on 21/9/06 at 06:17 PM |
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Yea, but mines more like an breeze block......................
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roadboy
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| posted on 21/9/06 at 06:52 PM |
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The big difference is inclined outboard suspension is falling rate ( not good), inboard is rising rate ( good ), the more the suspension travels the
stiffer you want it to be, giving better progressive load up. Outboard gets progessively softer both in spring rate & damper performance as it
compresses.
I bought inboard
HTH Ian
Jude Performance Services
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pawgrp
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| posted on 21/9/06 at 08:09 PM |
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Hi, was interested to see you're in manila. used to live there many years ago and have great memories of the place.
Have you looked at the new chassis from mk? its got inboard shocks and the chassis works well.
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peterriley2
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| posted on 21/9/06 at 08:10 PM |
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okay i have been told!!! i actually read that bit on a site reviewing the new(ish) caterham, they said caterham told them it was partly to do with
aerodynamics......
Joel
If you dont respect yourself, dont expect respect from anyone else
Live your dreams, dont dream your life
Women only want you for one thing- everything!
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mnr laptop
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| posted on 21/9/06 at 09:10 PM |
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biggest advantage for me is that i can run 100lb springs on the front of my racecar ( inboard ) as opposed to 300lb springs outboard which believe you
me changes the whole dynamics of driving the car, you could argue it it not necessary for the road and is mainly a track tool but taking cars round
the roads where we are it is immediately notiiceable the smooth ride
best regards
marc
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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G.Man
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| posted on 22/9/06 at 04:00 AM |
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Marc
I already know you speak the truth, roads in cyprus are worse than UK, and the compliant ride, yet firm handling is a joy to behold..
Much rather have decent suspension than beefy anti roll bars...
Opinions are like backsides..
Everyone has one, nobody wants to hear it and only other peoples stink!
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nitram38
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| posted on 22/9/06 at 05:10 AM |
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Inboard suspensions main benefit is un-sprung weight.
If the weight of the wheel on the wishbone is lighter i.e. no shock, then the wheel is more responsive over bumps.
This means that it will spend more time in contact with the road instead of in the air.
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Agriv8
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| posted on 22/9/06 at 07:12 AM |
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even with a v8 lump in ( or not in at this moment in time ) running 125 lb springs good for road a little soft for track.
Personally for the track id save your pennies a little longer and go for inboard.
Just out of intrest ( beacuase I dont know the answer ) does the rising rate / falling rate have much afect on the actual damper
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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02GF74
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| posted on 22/9/06 at 09:35 AM |
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quote:
Originally posted by nitram38
Inboard suspensions main benefit is un-sprung weight.
just what I was going to say.
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G.Man
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| posted on 22/9/06 at 10:10 AM |
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quote:
Originally posted by nitram38
Inboard suspensions main benefit is un-sprung weight.
If the weight of the wheel on the wishbone is lighter i.e. no shock, then the wheel is more responsive over bumps.
This means that it will spend more time in contact with the road instead of in the air.
Do you guys not understand rising rate and falling rate suspension??????
You lose very little unsprung weight going inboard as the shock is mounted to the chassis, so it is only the pushrod into the shock that is unsprung,
the top of the shock is mounted on the sprung chassis, unless you have them upside down
Opinions are like backsides..
Everyone has one, nobody wants to hear it and only other peoples stink!
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chockymonster
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| posted on 22/9/06 at 10:34 AM |
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On the RT+ you also get a wider front track which has to help with improved stability. Also the shock action isn't acting on the wishbone
directly it's controlled by the pushrod.
PLEASE NOTE - Responses on Forum Threads may contain Sarcasm and may not be suitable for the hard of Thinking.
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