RB20 Motor Mount Weight Bias Q.

[totoro001]

i've read through about 28383428 x 10(1231) threads that talk about different motor mounting options for the rb20, and the choices are pretty much mckinny, top hat, or the r32 crossmember.. and that's all great and dandy. but not one of them talk about weight bias. has anyone gone through the trouble of finding out which set of mounts give the car the best weight distribution? from what i hear the mckinny mounts set the motor the lowest, but do they move it back any? has anyone gone through the trouble of corner-weighing their car after the motor installation?

just curious.

[Gabe35Coupe]

For what it's worth that's a good question. don't have an answer for you though. I plan to put my car on the scales when i get the engine in (RB25) but that's a good ways out. That type of info would be good for choosing spring rates and other suspension set ups.

[Wulfgang]

Not an issue. The most any mount can move the engine back is only about 1" before hitting the firewall hard.

Moving 600-700 lbs by 1" will change the CG of the engine by about 1%. On a 3000 lb car, that amounts to roughly 0.2% change in overall weight distribution, i.e. your weight distro may change from 56/44 to 55.8/44.2.

[totoro001]

it may not be a big issue when the car is sitting around, but in racing (nearly any form) weight distribution, wether it be from front to back, or left to right, is a big issue. the closer to neutral you can get a car, the better it's going to handle and perform, and even if it is 1%, i ceritanly do care about that 1%.

the way i see it, if you're going to do something, either do it all the way, or don't do it at all :P

[JonPowell]

This is such a tired ****ing arguement.

I will say what I always say. I put you, in a perfectly balanced, 50/50 lt/rt ft/bk car up against a seasoned driver, I like Michael Schumacher adn elts see who wins a race of say...50 laps? I give M.S. a 60/40 car and you 50/50 and lets see who wins....

A good driver will be able to compensate for any flaws in a car, stop this stupied tired *** arguement, or dig up an old thread that got locked and see if your point has already been made, which it has, along with mine.

LOCK THIS THREAD!

[totoro001]

i just got done reading through 14 pages of RB info.. i'm not looking to argue.. and yes a seasoned driver will take a new driver any day, on any track, in any car.. but that same seasoned driver would no doubt do better in a superior car, would he not?

in 14 pages of posts, there isn't a single thread on weight bias and the RB20 engine mounts.

[BoostFab]

if you care so much for the 50/50 weight distribution, don't get the rb!!!! stick with your stock motor!

what exactly are you trying to do with your car, off-road auto-x or drag? i don't see a point of going nuts about 50/50 weights distribution on a street car.

[totoro001]

scca and drift.. and no, perfect 50/50 is most likely not at all attainable, especialy withen guidelines of scca rules, and any drifting organization rules (so doing stuff like back-halfing the car is out of the question).. but i'd like to get teh car as close to 50/50 as i can. and i'm sure i could get closer with a different motor besides the rb20det, but i was curious how close i could get with it.

[JonPowell]

Nobody who has an RB20 has really cared at all once they drove the car about weight distribution, get over this tired old fight.

[BoostFab]

Nobody who has an RB20 has really cared at all once they drove the car about weight distribution, get over this tired old fight.

exactly....

[totoro001]

man you guys are crabby-asses :P all i wanted to know is which set of mounts moves the engine back and down the most.. i mean this isn't a completely stupid post. i've been on the forum for like 3 months now, i've read all 14 pages of rb posts prior to asking the question, i searched again just in case, and in no post about mounts can i find this information.. i didn't think it'd be that much trouble.. :P

[JonPowell]

i've read through about 28383428 x 10(1231) threads that talk about different motor mounting options for the rb20, and the choices are pretty much mckinny, top hat, or the r32 crossmember.. and that's all great and dandy. but not one of them talk about weight bias. has anyone gone through the trouble of finding out which set of mounts give the car the best weight distribution? from what i hear the mckinny mounts set the motor the lowest, but do they move it back any? has anyone gone through the trouble of corner-weighing their car after the motor installation?

just curious.

man you guys are crabby-asses :P all i wanted to know is which set of mounts moves the engine back and down the most.. i mean this isn't a completely stupid post. i've been on the forum for like 3 months now, i've read all 14 pages of rb posts prior to asking the question, i searched again just in case, and in no post about mounts can i find this information.. i didn't think it'd be that much trouble.. :P

No, that is not all you wanted to know, you were after the illustrious "50-50 weight distribution" arguement that keeps rearing its ugly head, its a touch subject because people always get over involved and end up bitching at each other, the mods gotta come in and clean house. It is a ridiculous arguement and noone will ever have an answer that will make everyone happy.

Sorry to sound like an ***, but you gotta imagine all the crap that your simple question brings up and I am trying to avoid another poop slinging thread.

[IvoryJ30t]

even if you can build a 50/50 car, once you sit in it your ****ed.

when was the last time you heard a porsche guy complaining about his 40/60 weight ditribution?

[AZhitman]

Keep in mind that so-called "50/50" is NOT always perfect for the desired application.

[Yellow4g63]

totoro001

It looks like the Mckinny ones but I'll find out soon