Typically you see factory prepped cars are all sedans. "talking about touring and GT cars"

Why do they choose sedans if a coupe equivalent is available of the same model? What is the performance advantage?

I thought coupes were the Sporty versions.

Examples

Aussie V8 use sedans

also BMW in the Speed Touring car use(d) the 328I instead of the IS.

 

"touring car" restrictions might limit a "touring car" to a 4dr model only.

 

Fatories sell more sedans than their sports cars ...its better marketing to run the 4 door bmw than the 2 door usually

 

Generally I would think they would have a stiffer chassis due to a large B pillar as well.

 

because it doesnt matter unless the rules say you must use a 4door. otherwise, it doesnt matter. there are minimum weights, so weight isnt an issue. your putting a cage in it, so chassis stiffness isn't so much of an issue.
in some cases, the wheelbase is longer which is what some people are looking for.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Lo-Buck EF &raquo;</TD></TR><TR><TD CLASS="quote">because it doesnt matter unless the rules say you must use a 4door. otherwise, it doesnt matter. there are minimum weights, so weight isnt an issue. your putting a cage in it, so chassis stiffness isn't so much of an issue.
in some cases, the wheelbase is longer which is what some people are looking for.</TD></TR></TABLE>

that's what i was thinking.

 

The main reason is that the 4 door is stiffer than the 2 door and there's little weight difference. If you ask the BMW, Acura, Mazda World Challenge teams, this is what they are going to tell you.

 

more room for trophy girls?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by just4fun &raquo;</TD></TR><TR><TD CLASS="quote">The main reason is that the 4 door is stiffer than the 2 door and there's little weight difference. If you ask the BMW, Acura, Mazda World Challenge teams, this is what they are going to tell you. </TD></TR></TABLE>
funny, i have never heard that from someone RACING a 4-door.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by E-AT_me &raquo;</TD></TR><TR><TD CLASS="quote">more room for trophy girls? </TD></TR></TABLE>
FTW

 

I have heard of the 4 door stiffer than 2 door argument in the past also. The 2 door has a larger opening and the 4 door's opening is braced by the B-pillar making two smaller openings that is stiffer than the one bigger opening.

Probably be best to go to BTCC, DTM or whatever websites to find more info.

 

Pick up a phone and call some of the world challenge teams and ask. I can give you the numbers if you can't find them. For BMW - call Will Turner and James Clay, Acura - call PD, Mazda - Craig Nagler. Or go over to the World Challenge Forum and ask them...

 

Mjfan12 - BMW teams now use the e90 chassis which is better but have to use the 2.5 euro motor. the e90 4-door chassis is a bit heavier than the 2-door but better.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by E-AT_me &raquo;</TD></TR><TR><TD CLASS="quote">more room for trophy girls? </TD></TR></TABLE>

 

My SCCA GT4 1986 4 Door Civic FTW.

 

RTR races TSX's because thats what honda sends them to built to race and that is what they class.

Same with tri-point and the mazda.

 

yup. and as far as rtr, the tsx had way better suspension design than the dc5.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Lo-Buck EF &raquo;</TD></TR><TR><TD CLASS="quote">yup. and as far as rtr, the tsx had way better suspension design than the dc5.</TD></TR></TABLE>

I remember seeing an interview with someone from RTR and they said the added torque of the K24 was a factor also.

 

so on this topic, how many people here competetively (grassroots level) race 4dr platforms? not just hondas but anything, are there factors working in your favour if utilizing a 4dr chassis ie: points breaks/not having to take weight penalties/easier classes? this could turn into an interesting conversation and i was wondering how competetive i could be, in auto-x/hpde/TT with my soon to be purchased db8.

 

whats a db8?
i think people race 4 door e36 bmws because there are alot of them out there. easy tub to get. but i realy do not think there is any kind of advantage in using a 4 door chassis. any 'stifness' debate goes out the window because your putting a cage in the car.
weight isnt an issue because there are minimum weights. everyone has to essentially weigh the same.
the extra added length in wheelbase is nice, but thats more of a driver preferance thing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jeffy &raquo;</TD></TR><TR><TD CLASS="quote">so on this topic, how many people here competitively (grassroots level) race 4dr platforms? </TD></TR></TABLE>

In our region we have a 4 door 98 civic, a 4 door 95 integra and a TSX

 

If I had to race a sedan, it better look this good. I'm not adding any info just pics

other sedans racing (primarily jtcc)




Japanese text. Full of pics of JTCC.Enjoy
http://coronaexiv.hood.jp/jtcc/1995nissan01.jpg

 

sorry, db8=integra 4 dr. the one im purchasing will be a 94-01 body, theres plenty of them out there. what i mean in the idea of points is in scca/nasa rules having this part or that part added will make your car go from one class to a harder class if theres enough done, just wondering if a 4 dr would be a few points lower in the beginning of the classing (like an RS teg is lower class than Type-R) so that you could get away with doing more to the car before being bumped up a class????? i gotta read my rulebook again, its been awhile.

 

Many sedans including the 3 series are stiffer and while some 4 door models are the same weight most are heavier however 35 pounds worth of glass and window motors can be often removed from each door and replaced with lightweight lexan. The basic reason is simple smaller door openings and some models will also have higher strength steel in the b pillar, also on certain models the aerodynamics of the body and or smaller window openings which cause less drag. I'd imagine some 4door models actually have a stiffer and lighter floor pan as well.

On the DTM cars I've also heard them mentioning the broader floor pan making centralizing the driver and other weight at the lowest point easier.

According to PD real time likes the TSX because setting up the suspension is far easier and they dont tend to have the razors edge the RSX does. Since both cars now use the same engine thats no longer an issue and many changes to the RSX suspension have helped it to remain competitive.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jeffy &raquo;</TD></TR><TR><TD CLASS="quote">sorry, db8=integra 4 dr. the one im purchasing will be a 94-01 body, theres plenty of them out there. what i mean in the idea of points is in scca/nasa rules having this part or that part added will make your car go from one class to a harder class if theres enough done, just wondering if a 4 dr would be a few points lower in the beginning of the classing (like an RS teg is lower class than Type-R) so that you could get away with doing more to the car before being bumped up a class????? i gotta read my rulebook again, its been awhile. </TD></TR></TABLE>
rs, gs, ls are all in the same classes. gsr and itr are in differant classes (generally speaking) i dont know if your planning on autocrossing the car or roadracing it.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MV99-S &raquo;</TD></TR><TR><TD CLASS="quote">Many sedans including the 3 series are stiffer and while some 4 door models are the same weight most are heavier however 35 pounds worth of glass and window motors can be often removed from each door and replaced with lightweight lexan. The basic reason is simple smaller door openings and some models will also have higher strength steel in the b pillar, also on certain models the aerodynamics of the body and or smaller window openings which cause less drag. I'd imagine some 4door models actually have a stiffer and lighter floor pan as well.
</TD></TR></TABLE>
alot of the weight savings stated are assuming you can do that stuff. if its an IT car or something along those lines (IT, spec e36, h4-h2) you cant remove rear glass and replace with lexan. you may be able to remove the glass, but i know you cant gut the doors. so all the motors and such most likely have to stay in (in the rear doors)
as for the 'stronger steel in the b-pillar'.....i dont know about that.
and again, your forgetting. your putting a cage in the car. alot of the 'chassis stiffness' debate goes out the window

 

the rsx is dead for RTR they were getting ride of the last car they have in order to run all TSX's