Squirrely under hard acceleration
Thread Starter
Joined: Jun 2014
Posts: 1,241
Likes: 47
From: Noblesville, IN
Squirrely under hard acceleration Finally got yo take the car out for some fun this weekend. Was doing a pull on a fairly smooth road, and the car is incredibly squirrely when shifting. I know that the on/off/on the gas will unload the suspension, but it seems like the rear is trying to kick out when I get back on the gas.
mods are: stock springs/shocks, offbrand adjustable phb, founders lcas, umi 3 point sfcs.
I verified the rear was centered (measured from wheel lip to top of fender well), but not sure where to start figuring this out.
mods are: stock springs/shocks, offbrand adjustable phb, founders lcas, umi 3 point sfcs.
I verified the rear was centered (measured from wheel lip to top of fender well), but not sure where to start figuring this out.
Finally got yo take the car out for some fun this weekend. Was doing a pull on a fairly smooth road, and the car is incredibly squirrely when shifting. I know that the on/off/on the gas will unload the suspension, but it seems like the rear is trying to kick out when I get back on the gas.
mods are: stock springs/shocks, offbrand adjustable phb, founders lcas, umi 3 point sfcs.
I verified the rear was centered (measured from wheel lip to top of fender well), but not sure where to start figuring this out.
mods are: stock springs/shocks, offbrand adjustable phb, founders lcas, umi 3 point sfcs.
I verified the rear was centered (measured from wheel lip to top of fender well), but not sure where to start figuring this out.
Thread Starter
Joined: Jun 2014
Posts: 1,241
Likes: 47
From: Noblesville, IN
The issue is just that the car is almost scary. It's not just that the car moves a bit while shifting, I never expected a mostly stock suspension to track like an arrow, but it's not confidence inspiring when it feels like I'm on the verge of going sideways.
and when you say lcas, do you mean adjustable or just aftermarket? Cause I already have founders on there.
and when you say lcas, do you mean adjustable or just aftermarket? Cause I already have founders on there.
Staging Lane
Joined: Jan 2015
Posts: 81
Likes: 0
From: Portland, TX
My car is doing the same, im on all stock suspension from the factory and have 98k miles on it, I shifted from 3rd to 4th at 6k rpms the other day , and I almost went into the wall between lanes!!! it was very violent! im thinkin stock suspension is just worn and tired !, im just not sure what mods to start with.. maybe new bushings or a trans mount, torque arm? but yeah its very sketchy , and makes me think twice before getting on it! let us know if you find anything...
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When I get on my 6-speed 99 z vert from a standing start, the rear end car veers rightward. I suspect it's the Nitto Motivo's I've got installed in the rear. Car is lowered on Strano's with Koni Str.t's, founders non-adjustable lower control arms, UMI sway bar and adjustable panhard. The Nitto's are 315/35-17's with plenty of tread on 17x11 wheels. I've not had any experience downshifting and getting seriously on it at speed.
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Verdad Gallardo Thread Starter
Joined: Jun 2014
Posts: 1,241
Likes: 47
From: Noblesville, IN
Motor is definitely not stock. About 450 rwhp.
the car did it before, though not near to the degree it does now. I know that it's the sudden increase in power. I don't mind the rear kicking out on a 1-2 shift, but on the 3-4 at 100mph is frankly scary.
I'm not saying something is broken, nor am i expecting straight as an arrow launching, I just want to get the car under control a bit so it doesn't feel like I'm about to go shooting off the road every time I want to have fun lol.
the car did it before, though not near to the degree it does now. I know that it's the sudden increase in power. I don't mind the rear kicking out on a 1-2 shift, but on the 3-4 at 100mph is frankly scary.
I'm not saying something is broken, nor am i expecting straight as an arrow launching, I just want to get the car under control a bit so it doesn't feel like I'm about to go shooting off the road every time I want to have fun lol.
Thread Starter
Joined: Jun 2014
Posts: 1,241
Likes: 47
From: Noblesville, IN
Tires are good tread-wise. They aren't sticky tires (Goodrich sport comp 2s) but I don't feel like they're breaking free. Just feels like the weight of the car is lurching to one side.
TECH Fanatic
Joined: Mar 2014
Posts: 1,266
Likes: 165
Put a good ARB on there and get some good adjustable control arms. Preferably with hiems. But at least get them with derlyn bushings. Not sure if I spelled that right. Rubber bushing will let your rear end move under hard acceleration. The ARB will keep her straight and the better bushings will keep it from wandering.
I don't know why you're all saying LCAs, he's already replaced those. Now the question is how old they are and how do the bushings look? If the bushings are worn then that can cause issues. The only reason adjustable LCAs would help is if his thrust angle was off for some reason.
My car would kick the rear end on the 1-2 shift when the stock stuff was worn out with worn tires easily, but new Founders LCAs with good bushings and new tires fixed that right up.
My car would kick the rear end on the 1-2 shift when the stock stuff was worn out with worn tires easily, but new Founders LCAs with good bushings and new tires fixed that right up.
The issue is that these cars are too stout and you can actually see out of them. I only have 425 N/A to the wheels with every drag race suspension part on it you can imagine and everything dialed in and degreed. I'm on 275/50/15 MT ET streets, and I launched on the street from a dig after my new tune and it was SQUIRRELY. Chirped tires in every gear in my heavy S60 with 4000 stalled auto. Prior to having it all dialed in with the tune, I could actually hook but the extra power since the tune makes it hard to launch this 3560 lb car straight. Time for 315's and to replace these UMI 2018-R's. People are wanting me to launch on the 150 shot on the street? I'm not trying to put the car into a telephone pole. Let's get it straight while N/A first and then we can worry about the hit. I know my Spohn drag sway bar #921 ain't the problem.
Last edited by 5.7stroker; May 14, 2018 at 11:00 AM.
The issue is that these cars are too stout and you can actually see out of them. I only have 425 N/A to the wheels with every drag race suspension part on it you can imagine and everything dialed in and degreed. I'm on 275/50/15 MT ET streets, and I launched on the street from a dig after my new tune and it was SQUIRRELY. Chirped tires in every gear in my heavy S60 with 4000 stalled auto. Prior to having it all dialed in with the tune, I could actually hook but the extra power since the tune makes it hard to launch this 3560 lb car straight. Time for 315's and to replace these UMI 2018-R's. People are wanting me to launch on the 150 shot on the street? I'm not trying to put the car into a telephone pole. Let's get it straight while N/A first and then we can worry about the hit.
Viking double adj coil over kit on all 4 corners A206-350K, C213-R, 14DP150
UMI Kmember and Arms (2311 and 2305 a-arms)
UMI adj rear lower control arms 2018-R
Front sway bar removed
MWC Tunnel mount torque arm and 3.5 catback crossmemer
Spohn Rear Lower Control Arm Relocation Brackets #210-S
Spohn drag sway bar #921
Adjustable Spohn Panhard bar #104
BMR Weld in SubFrame Connectors SFC001
Prothane Motor mounts 7-512
UMI Strut tower brace 2005-R
Moog K6516/17 Front Upper Strut Mount Kit
Moog K6573 Macphereson Strut Mount Assembly
ACDELCO 22174970 Transmission Mount
Tie Rod End MOOG EV260
Tie Rod End MOOG ES3238RL
Wheel Bearing & Hub Assembly TIMKEN 513090
ENERGY SUSPENSION 913101R Tie Rod End Boots
Thread Starter
Joined: Jun 2014
Posts: 1,241
Likes: 47
From: Noblesville, IN
I don't know why you're all saying LCAs, he's already replaced those. Now the question is how old they are and how do the bushings look? If the bushings are worn then that can cause issues. The only reason adjustable LCAs would help is if his thrust angle was off for some reason.
shocks, springs, and sways are all in this cars future, I just didn't know if there was something else I should be looking into as well.
Besides what has been mentioned, primarily shocks, I would also consider an alignment possibly after replacing any stock bushings/mounts/ball joints with new/polyurethane. Try to eliminate any shock to the system that could unload your suspension.
