wheel hop on 1-2 shift, what can I do to fix it?

[andrewtac]

video
First time to the track, 10.28 was my best with 60' in the 1.7 range. Car ran strong, except I had a violent spin/wheel hop on the 1-2 shift every pass. Video shows it. I have all the BMR stuff in the back and viking shocks. I start with 25 psi, and went down to 16 with the same results. Tried in drag mode with the adv track off, and even did a run with the plug pulled; so I know it wasn't the nannies. Shocks are I believe set at 5/7. Car details in signature. Where do I start?

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[bluebeastsrt]

Did you have an opportunity to walk the track before everyone started? Might have just been shitty prep. You were out a good distance before you spun. So I doubt it’s the shock settings. The car should have been settled by the time you spun. If you have the same issue the next time you race. You might want to get your tuner to turn down the 1-2 shift firmness.

 

[andrewtac]

Did you have an opportunity to walk the track before everyone started? Might have just been shitty prep.

I did not. First time back in about 25 years. I think better burnouts might have helped. Other mustangs there were not doing it. One guy running 9.9 with a PD blower wasn't spinning on the 1-2 shift, A10 car as well. Wasn't sure if shock setting would help. I did sent the files to the tuner, maybe they can take some out of the shift. Looking at the logs it looks like it keeps spinning until about the time it gets to third.

 

[bluebeastsrt]

I had the same problem with my supercharged 15. For me it turned out to be the tires. I switched from Nto5r’s to E/T street R’s and the problem went away.

 

[cahouston]

I had the same problem with my supercharged 15. For me it turned out to be the tires. I switched from Nto5r’s to E/T street R’s and the problem went away.

I agree,

Tires are the key here. The 555riis are a good street DR but at that power level, you need something stickier like a MT ET Street R on a 17 inch wheel.

 

[deanm11]

May I ask your 1/8th time and trap speeds ? I have trouble hooking my FBO NA car on Nittos but not hop. 305-45-17 ET Street Rs if I want to get it all, maybe its enough for your power too.

 

[andrewtac]

I agree,

Tires are the key here. The 555riis are a good street DR but at that power level, you need something stickier like a MT ET Street R on a 17 inch wheel.

OK sticky tires, but why still wheel hop with all the stuff that is supposed to fix it? Anything I can do to fix that, as it is rather violent in the car and don't want to break anything. On the drive home the rear end whine was worse, hope it didn't damage anything. Haven't drove today yet, hope it was just because the rear end was hot.

 

[andrewtac]

May I ask your 1/8th time and trap speeds ? I have trouble hooking my FBO NA car on Nittos but not hop. 305-45-17 ET Street Rs if I want to get it all, maybe its enough for your power too.

best run attached.

 

[cahouston]

OK sticky tires, but why still wheel hop with all the stuff that is supposed to fix it? Anything I can do to fix that, as it is rather violent in the car and don't want to break anything. On the drive home the rear end whine was worse, hope it didn't damage anything. Haven't drove today yet, hope it was just because the rear end was hot.

Wheel hop is a result of traction loss. Sure up traction and no more wheel hop. I can launch on a prepped track on a mediocre tire and I get wheel hop on my NA A10 on 1-2 shift. Same track on a 17x9 wheel with bias ply DR and no spin, no hop.

 

[andrewtac]

Wheel hop is a result of traction loss. Sure up traction and no more wheel hop. I can launch on a prepped track on a mediocre tire and I get wheel hop on my NA A10 on 1-2 shift. Same track on a 17x9 wheel with bias ply DR and no spin, no hop.

thanks, wasn't sure; thought it would just spin rather than hop with all the goodies.

 

[cahouston]

thanks, wasn't sure; thought it would just spin rather than hop with all the goodies.

Yeah, seems some cars, no matter the suspension/chassis mods, still have some hop when traction begins to break down. It's not like the solid axle cars that just spin steady.

 

[brucelinc]

I have the BMR cradle lockout kit and vertical links. Hopped like a rabbit on the 1-2 shift until I put on a set of ET street Rs.

 

[andrewtac]

Spoke with BMR tech today, very helpful and went into great detail. He suggested I tried higher settings on the shocks (had them 5/7 for the street) and if that didn't work maybe add adjustable front shocks as well. He suggested it could be the nose dropping some on the shift. He also mentioned trying a 2nd gear leave, checking with Lund on this.

 

[Coyote Chase]

I launched @ 2500 in 2nd gear all last season. Very do-able, but then your going to have to use your paddle shifters for at least your 3rd gear shift, or all the gears, if you choose...

 

[andrewtac]

I launched @ 2500 in 2nd gear all last season. Very do-able, but then your going to have to use your paddle shifters for at least your 3rd gear shift, or all the gears, if you choose...

Why do I need to use the paddles for 3rd? Is that a limit of the tune?

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