Car Starts Shaking Down the Drag Strip

[robdog5.0]

So a little context
21 GT Vortech V3 91 oct. PB 10.2 @ 139.70

BMR Lock out
BMR Toe Links
BMR Vertical Links
BMR Front/Rear Springs
Drag Pack Front Runners / MT ET Street R 305/45/17
Upgraded Half Shafts

So my launches are absolute butter best 60ft 1.676 absolutely no wheel hop or shake, but as I’m flying down the track and hit about 95+ the car starts shaking as you’d be going down a rocky road or what feels like wheel hop I always stay in it and consistently hit 10.2-10.4 @ 137 - 139 and nothing breaks lol. just curious if anyone has any ideas to eliminate this or suspension mods I should get?

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[ZXMustang]

Its the DRs. MTs are horrible these days, they might balance but they arent round. Then you will get the heavy vibrations on the big end.

 

[ZXMustang]

And to eliminate it, get hoosiers or racemasters. Or Nittos. MTs are junk these days.

 

[Torinate]

Agree with the MT comments.
10.2 at 139+ on 91 octane is impressive! How much boost and timing?

 

[K4fxd]

And to eliminate it, get hoosiers or racemasters.

Could also get the MT's trued if they are out of round.

https://www.mortonsonthemove.com/tire-truing/

 

[Proshop]

Its the DRs. MTs are horrible these days, they might balance but they arent round. Then you will get the heavy vibrations on the big end.

Aren’t you running MT’s?
I will say my first set had horrible vibration up top and then I switched to drag wheels and got a new set and they have been light years better.

 

[ZXMustang]

Aren’t you running MT’s?
I will say my first set had horrible vibration up top and then I switched to drag wheels and got a new set and they have been light years better.

Unfortunately yes. They still hook the best. But man quality has gone down hill.

 

[Proshop]

Unfortunately yes. They still hook the best. But man quality has gone down hill.

You think it’s across the board with all their tires or just the street versions? I have the same SS in the rear as you and the street comps in front and have no real complaints this time around… other than I have to much power for the SS.

 

[ZXMustang]

Ive been through three sets of those same MT ET street SSs over the last two years and they have all been shit. But I keep getting them from that dragracingwheels.com site, so maybe they got a bad batch. Next ones Im getting from someone else like beefcake or something.

 

[WildHorse]

That generally happens to me around 1.21 gigawatts @ 88mph.

 

[2022 Mach 1]

And to eliminate it, get hoosiers or racemasters. Or Nittos. MTs are junk these days.

What nittos would you recommend? Still some places have NT05rs available or the newer 555rII?

 

[robdog5.0]

I run NT555 rii for my daily set up 315/35/17 these things hook so good on the street I’ve had 305/45/17 for the drag no problem at 450whp but went with MT Street R instead when I got the supercharger. I personally have nothing against either but i do think the MTs will out perform the Nittos on the strip with higher horsepower if there’s anyone on here running 555r iis on the strip and has 700whp+ I’d love to know your opinion. Side note your trap will be faster with the MT ET Rs

 

[robdog5.0]

Agree with the MT comments.
10.2 at 139+ on 91 octane is impressive! How much boost and timing?

I wish I knew my boost number but I don’t. 3.6 pulley with a 17degre cap of timing due to bad gas, I have to run maddative every time I want to go to the track but this will be fixed when I get my fuel system and 3.33 pulley next week for e85 hoping for atleast 12-13lbs of boost shooting for 850whp

 

[2022 Mach 1]

I wish I knew my boost number but I don’t. 3.6 pulley with a 17degre cap of timing due to bad gas, I have to run maddative every time I want to go to the track but this will be fixed when I get my fuel system and 3.33 pulley next week for e85 hoping for atleast 12-13lbs of boost shooting for 850whp

Who are you doing your tuning with?

 

[SLIC V6]

I run the MT SS's on one of my cars (non Mustang) and the tires are quite heavy.
I do enjoy the traction that they provide, both on the street and on the strip.
My shop did complain to me that they were a _itch to balance out.
Maybe take them to another tire shop and see if you tossed a weight or if they didn't get them completely balanced?

I hope this helps!
ENJOY!!!
- Jerry

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