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| Understeer problem... https://forum.silviansw.com/viewtopic.php?f=12&t=33449 |
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| Author: | REDNRG180 [ Fri Jun 26, 2009 7:39 pm ] |
| Post subject: | Understeer problem... |
I have 180sx on G4 coilovers. Also have front and rear strut braces front caster rods and rear camber arms. I use car for street and drift. I have a lot of understeer even on new rubber up front. My alignment is front: -1 Camber 1mm toe in each side +7 caster rear: 0 toe -.5 camber Also wondering what people are running for their silvias. |
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| Author: | fergo308 [ Fri Jun 26, 2009 9:37 pm ] |
| Post subject: | |
your alignment is crap for drift,or even normal street work. run 2deg. neg camber up front,with 2mm total toe OUT. rear,1.4deg neg camber,2mm total toe IN. should turn in a bit nicer with that. Justin... |
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| Author: | REDNRG180 [ Sat Jun 27, 2009 12:58 am ] |
| Post subject: | |
Thanks. Does caster play any role in handling? I read that more caster better straight line, less caster better turn in, or something like that... |
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| Author: | fergo308 [ Sat Jun 27, 2009 7:21 am ] |
| Post subject: | |
more caster improves stability at speed,give faster self-centering,and more dynamic negative camber. steering effort will also be increased,but as you have power steering you won't notice that. less caster gives the opposite. Justin... |
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| Author: | REDNRG180 [ Sat Jun 27, 2009 1:27 pm ] |
| Post subject: | |
Cheers. I'll try yr specs for next alignment. |
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| Author: | hokkaido [ Sat Jun 27, 2009 2:37 pm ] |
| Post subject: | |
do you run swaybars? if so and theyre adjustable, try stiffening the rear. |
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| Author: | REDNRG180 [ Sat Jun 27, 2009 2:57 pm ] |
| Post subject: | |
The rear is stiff enough if you know what G4 coilover is... I blame the front set up. |
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| Author: | hokkaido [ Sat Jun 27, 2009 4:00 pm ] |
| Post subject: | |
right.. have fun with the G4s |
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| Author: | REDNRG180 [ Sat Jun 27, 2009 9:30 pm ] |
| Post subject: | |
They are disaster on street that's no brainer, but i find them pretty good for track or drift. |
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| Author: | whyte [ Tue Jun 30, 2009 3:01 pm ] |
| Post subject: | |
yeah, the G4s are stiff as! what tyres you running & as billy stated, got upgraded/adj swaybars? |
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| Author: | Nebuchernezzer [ Tue Jun 30, 2009 4:45 pm ] |
| Post subject: | |
What are your new tyres? I have no understeer issues with my car even though the front tyres are pretty middle of the road. Khumo Ecsta ST117 (or something like that) up front, 215/45R17 Front: 0 toe 2.5 degrees camber 7 degrees castor Rear: 0 toe 1 degree camber My spring rates are 7/5kg front rear but i didn't really have any issues before with 10/8kg springs. Things like a tight LSD will promote front end push at times, i have a KAAZ 2 way but it's fine as is. I've got a R32 GTR rear sway and a fat aftermarket one of some kind up front. I wouldn't want to run more toe out on the front of mine really, it's probably make it pretty darty. It's already a bit darty feeling if I start driving the Silvia after spending a week in a 'normal' car of some kind (but it only takes a minute to get used to). You got your dampers set full soft? I'm going to disagree a little and say if you are going to get an alignment again leave the rear but add a touch more camber to the front and go 0 toe up front as well. Max out the castor. |
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| Author: | REDNRG180 [ Tue Jun 30, 2009 5:33 pm ] |
| Post subject: | |
Tires are Potenza GIII 235/45/17 rear & Adrenalin 215/45/17 front. Stock swaybars. I dun really feel the need for other sway bars. Maybe thicker on rear... how much thicker is rear GTR sway bar, does it bold on? EDIT: Caster doesn't go more then +6.5 on new rubber. I should have got 40 for the front |
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| Author: | whyte [ Wed Jul 01, 2009 10:41 am ] |
| Post subject: | |
gtr swaybar bolts straight on the rear to s13 chassis. its a good upgrade if u can get the swaybar at a good price. play around with your dampers, obviously not full soft as that won;t help. |
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| Author: | Nebuchernezzer [ Wed Jul 01, 2009 11:43 am ] |
| Post subject: | |
I did the sways later on in the life of the car. I run generally run all my dampers as soft as possible. Your tyres sound like they are probably better than mine! When does it understeer? With really stiff suspension you'll find the car bucking and skipping on corners with any bumps in them and the thing will slip sideways as the tyres unload. |
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| Author: | REDNRG180 [ Wed Jul 01, 2009 1:29 pm ] |
| Post subject: | |
Car bounced around like that on original G4 springs and 215/40R18". Runs smoother now on thicker rubber 45R17 and softer springs. My mate just picked up his 180 yesterday. It's on D2 (same as G4) and it bounces too f***ing much. It's freakin good for drift or track tho. No need for sway bars really. So, coilovers are not the issue here. Anyways back to the topic... It darts in and holds grip on left hand corners. And seems to play up on right handers mainly. Understeer starts early mid corner right after turn in. It feels weird when it does that. I also noticed there is a click as more load is applied to left wheel. And again it can't be a coilover. As if something is not tight enough and chassis geometry changes under load. Cos when I re-aligned to above specs it got better but didn't go away completely. |
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