Double wishbone adder

[GKR_17]

Is there an adder for double wishbone front suspension? I had thought it was standard, much like the -100 for FWD.

Grafton

[Xian]

I believe that it is a 50# adder for Double Wishbone... also, I thought FWD was 50# in the slower classes and only 100# in ITS and ITR. Not 100% on these figures but it's what I recall from previous conversations.

[GKR_17]

The reason I ask is about 1/3 of the ITR cars are double wishbone front, but none appear to have this adder. Was that intentional, and will it continue as new cars are added?

[ekim952522000]

I have noticed this as well

Here are some examples I can see

Honda S2000 = 240*1.15*11.25=3105-100 (no torque)=3005 (does not appear to have double wishbone adder)

Acura RSX-S = 200*1.25*11.25=2812.5-100(fwd)-50(bad suspension) = 2662.5 (round up 2665) (interesting since it appears to get a deduct for bad suspension)

Honda Prelude = (97-01) 195*1.25*11.25= 2742.2-100 (fwd) = 2642.2 (round down 2640) (does not appear to have a double wishbone adder)

Honda Prelude = (93-96) 190*1.25*11.25= 2671.8-100 (fwd) = 2571.8 (round down 2570) (does not appear to have a double wishbone adder)

Nissan 300zx = 222*1.30*11.25=3246 (round up 3250) (does not appear to have a double wishbone adder)

BMW 325i (92-95) = 189*1.30*11.25= 2765 (Does not appear to get a deduct for struts)

My guess would be this has something to do with ITR as a class since Double wishbone suspension appears to be the norm in the class maybe the ITAC figured there was no point in using a adder for it.

[GKR_17]

But it's not the norm. About 2/3 of the cars in ITR don't have double wishbone. I don't believe there's any deduction for struts or "bad suspension" like you say for the RSX. I won't fight it if this is the new process, but we need to be consistent, it's not like it's any less beneficial on a faster heavier car.

[GKR_17]

I believe the 300ZX has struts, maybe Jeff Young could chime in here. A few others that you missed were: Acura Integra Type R, Acura Legend, Lexus SC300, Toyota Supras, and the Rx-8.

Andy said the recently classed ITA 914/6 got an extra 50 lbs for mid engine, I don't think the ITR Boxter did.

If we're going to have a process we need to follow it, otherwise it's no better than the old mystery closed door system.

[ekim952522000]

I believe the 300ZX has struts, maybe Jeff Young could chime in here. A few others that you missed were: Acura Integra Type R, Acura Legend, Lexus SC300, Toyota Supras, and the Rx-8.

Andy said the recently classed ITA 914/6 got an extra 50 lbs for mid engine, I don't think the ITR Boxter did.

If we're going to have a process we need to follow it, otherwise it's no better than the old mystery closed door system.

I did not miss those other cars just did not feel like doing every one of them.:)

I don't think the RSX got a deduct for struts I think it got a deduct for having crappy suspension.

Also it is my understanding that every car in ITR did go through the exact same process and currently is the only class that has.

[JeffYoung]

300zx has upper and lower control arms, front and rear. Please no more weight on the car though! lol........

Seriously, I don't know why some R cars didn't get the adder. I agree with Grafton we need to be consistent.

[Xian]

Is it a case of most cars in ITR having DW or good strut designs so no adjustment is needed? Only a deducter for very poor designs like the RSX?

[Tristan Smith]

Actually the 300zx front suspension is problematic. It is an upper control arm set up, but nowhere as good as a doublewishbone. There is NO camber adjustment available either. It's set by it's design/factory. I think I should get a 100lb break just because of that! Wink Wink.

Oh, and Happy New Year Everyone.

[iambhooper]

Is it a case of most cars in ITR having DW or good strut designs so no adjustment is needed? Only a deducter for very poor designs like the RSX?


What? Are you guys dissing my new/future ride? Did I make a mistake in not getting my wife a Solstice instead?

hoop

[ekim952522000]

What? Are you guys dissing my new/future ride? Did I make a mistake in not getting my wife a Solstice instead?

hoop

No way we love the RSX:)

[Ron Earp]

I don't remember any adders fora double wishbone layout. It does appear to be an oversight in the ITR classing process. Either you have an adder for having DW, or you have a subtractor for the cars that don't enjoy the DW layout.

I completely agree that we need to be consistent and maybe the ITR class needs to be re-evaluated since it is in a relative state of infancy. While we're at it maybe we can make a move on that year old Pony car proposal for ITR. I'm sure if we'd gotten those cars in for the 2009 GCR Grafton and Rickey might have a bit more competition this Spring.

Ron

[GKR_17]

Bring on the pony cars! The more the merrier.

[Xian]

What? Are you guys dissing my new/future ride? Did I make a mistake in not getting my wife a Solstice instead?

hoop


No way we love the RSX:)

True! The RSX is a great car and the suspension is perfect... as long as you can keep it from moving ;)

[iambhooper]

I've not put it on the rack... or looked at the shop manual since I got the car. By the comments, I'm guessing it must be notorious for bump steer?

I'm not too worried. By the time I regain possesion of the car from my wife, the rules for ITR will be more than matured! :D

[Xian]

Yeah, you ought to get in touch with Lee Grimes from Koni (not sure if he's on this board). He'll have some more detailed info on ideas for a baseline setup on the car and what the "problem areas" are on it. I've got Zero first hand experience with one and I think it'd be a hoot to drive but it's not going to corner like most other Honda's. From what I remember, the spring rates you'll be running are beyond crazy... do some research and try posting any suspension questions over on www.roadraceautox.com. Lee's over there along with a couple others who may be able to help.

Christian