Hello! my car is a 2007 cut and welded Trinity tvs gt500 with 750+ rwhp, 4.10 gears (i know), bmr lower control arms (heim/poly), Steeda upper contol arm and bracket, fays 2 watts link and revan racing dead hooker springs with ride height adjusters. I am running a hoosier 325/45/18 drag radial (29.9" tall) to try and knock down the gearing a bit but i have the car jacked up really high in the back to fit the tires. My lower control arms are in the lowest hole in the control arm relocation brackets right now. Im just wondering if there is a such thing as TO MUCH instant center?? with the amount the car is raised in the back and still being in the bottom hole.... i dont think i could add any more instant center to the car if I tried. IT still spins the tires with ease in 2nd and part of third gear. The car is primarily for short cruising and drag racing.... but the constant spinning on the street is not all that fun. Any opinions are appreciated.... Thanks
Question for rear suspension guys
- Thread starter devilish64
- Start date
I'd say pulley it down to get power more manageable for street,, then put pulley back on for strip. Get the quick change pulley setup,
What's your 60fts at the track.
What's your 60fts at the track.
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1.57 60 ft is the best ive managed so far on 29-10.5W.... it Dead hooked at the track before i went E85 but I havent been back since
You running adjustable rear shocks? They could help.
You need something to cushion the weight transfer, so it doesn't shock the tires instantly is my opinion. I noticed a difference on the stock goodyears with my viking double adjustable lol.
You need something to cushion the weight transfer, so it doesn't shock the tires instantly is my opinion. I noticed a difference on the stock goodyears with my viking double adjustable lol.
yeah i actually have those shocks and they are bad ass.... i forgot to say i had those. i think my gear is just to much for the power the car is making at this point.
Thank you for the gear ratio calculation... i have always wondered what it is with that tall of a tire
If your rear suspension is actually lifted more than stock ride height, I would try using the highest hole on the LCA relo brackets or stock mounting location on the rear axle. For street use, your LCAs should be somewhere between parallel to the ground to 1-1/4" lower on the rear axle when compared to the forward body mount (angled downwards toward the rear of the car). I tinkered with the LCA relo bracket settings on my car and could feel the difference in traction and braking. With 1-5/8" lowering springs in the back of my car, the middle hole on my MM relo brackets work best for my application. Is your UCA angled up towards the front of your car?
Are you correcting the pinion angle with these adjustments, or is that what "instant center" means? Negative angle will soften the launch, reportedly. Under power the angle will correct itself to a more neutral angle. Might want to touch base with BMR. They already know the results of tweaking the set ups. Good luck,
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im pretty sure that even in the highest hole in the relocation bracket i would still have a pretty good angle pointing down toward the axle. I think i'm gonna try and move them up to the top hole and see what happens. I wasnt sure if there was a such thing as "TOO MUCH" angle to the lower control arms. I might try and get in touch with the guys at bmr and see if they have any insight as far as pinion angle is concerned. THANKS GUYS... sorry for the shitty picture
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This is good advice.
You cannot take a reading with it half on the trailer.
I had my car up on ramps last night to change my oil and inspect everything under the car, so I snapped a couple of pictures of my rear upper and lower control arms.
My UCA is adjusted to give me a -2 degree pinion angle. It is also angled slightly lower in the front as compared to the rear attachment point on the differential. I could not get an angle finder up there, but if I were to guess, I would say it’s a 3-5 degree angle sloping down towards the front of the car.
My LCA rear attachment points are in the center holes on my MM relo brackets, and that gives me about a 3.5 degree angle sloping down towards the rear of the car, which is about a one inch difference in height between the chassis and axle end LCA mounting points. I am approaching 90% (+/-) anti-squat with my rear suspension settings, which is more oriented towards drag racing. For reference, dual purpose street/strip target anti-squat is 60%. My car hooks well on the street with these suspension settings and MPSS 295/35R19s in the rear.
I have spoken with Kelly at BMR and the guys at Maximum Motorsports and dialed my suspension in according to their recommendations for my application, and the result is traction
My UCA is adjusted to give me a -2 degree pinion angle. It is also angled slightly lower in the front as compared to the rear attachment point on the differential. I could not get an angle finder up there, but if I were to guess, I would say it’s a 3-5 degree angle sloping down towards the front of the car.
My LCA rear attachment points are in the center holes on my MM relo brackets, and that gives me about a 3.5 degree angle sloping down towards the rear of the car, which is about a one inch difference in height between the chassis and axle end LCA mounting points. I am approaching 90% (+/-) anti-squat with my rear suspension settings, which is more oriented towards drag racing. For reference, dual purpose street/strip target anti-squat is 60%. My car hooks well on the street with these suspension settings and MPSS 295/35R19s in the rear.
I have spoken with Kelly at BMR and the guys at Maximum Motorsports and dialed my suspension in according to their recommendations for my application, and the result is traction
i switched to the upper most hole in the BMR relocation bracket and it did indeed still have a downward angle much closer to what you have SCGallo2. Traction seemed to be much better but i had a slight vibration which I assume is the pinion angle being a good amount off at this point. I have the car up on blocks right now so i can adjust that as soon as I can. I appreciate all the help.... this car is sooo much fun with traction in second gear. :burnout:
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