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mt 315/50/17

rookerrobert

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#1
well I bought them had them mounted and just dont like the power band I car is in so I went back to the 305/45/17 both sets are the r's I just couldnt get the pressure right I guess.Started out at 20lbs. and went down to 16lbs. and couldnt get them to work.
 


vortecd

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#2
More info. Did they not hook? I have never ran them that low on pressure. What times have you run and did you run and what mods?
 


RGPIII

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#3
Definitely need a lot more information? These should and do out perform the 305's in every aspect on a hellcat. Unless you're specifically speaking on the rpm while cruising down the highway.
 


OP
rookerrobert

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Thread Starter #4
No I never drove them on the road.....the best et was 10.20@ 135 but my 60 was 1.60 but with the 305 I ran 10.09@138 with a 1.38 60' mods. are upper2.75 stock lower lm cai. 1050x injectors and tune. On susp. 3.09 with poly bushings cradle and diff. and outlaw axle's and redeye spindles. When I started at 20lbs. and they spun bad so I drop them to 18 and it was better but still so I went down to 16 and then wheel hop bad.went back up to 17.5 but by that time the track sucked so many street cars with regular tires dragging water every where. It was taking 45 mins. to a hour to get a run in
 


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rookerrobert

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Thread Starter #5
I know this might sound stupid but I almost feel like maybe they need breaking in? My first run I done one helluva burn out. Then after that I dont think I did enough.I'm not giving up I put them up for sale and I'm not gonna I'm gonna give it sometime and try and get the pressure where it needs to be.
 


RGPIII

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#6
18-19 psi will be the magic number for those. The 315’s will offer far more traction, better 60’s and a much better ET than the 305’s. If you hooked on 305’s but not 315’s something is way wrong and you need to get that fixed.
 


16GoManGoHC2

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#7
Need that longer burn out and they’ll hook, around 18-20 psi HOT after your burnout.
 


Unholy707

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#8
I start at 18 psi before burnout. At end of pass I check tire pressure again and it’s usually around 19. Tire pressure is huge, you need to check it. Also, they are taller and have more rollout. They need to be broken in, burnout and launches. Don’t expect to get more than 30-40 super smokey burnouts on them, passes and 1k street miles. I’m almost out of grooves, down to/past the wear bars. Then again mine were brand new and my first hit I just went straight, hooked and ran 9.9 on them first hit ( but track was still prepped from sick week that never happened). Need better track prep, or what I do… a John Force burnout. If I shake the tires, I do a longer burnout and then I don’t have any issues
 


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rookerrobert

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Thread Starter #9
Thanks guys.....that's what I thought they need so time. yeah I done john force burnout the first time but when I went to stage about couldnt see the tree.But trust all you guys and I think I have it now.There a big event may 9-10th and 11th and 12th. I want to run in the 10.0 index and I found if I had to run all the way out the back door is easier than lifting on the throttle.
 


RGPIII

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#10
One of my customers won the 10.0 class on the 315/50/17 yesterday. They hooked dead every pass for him.
 


OP
rookerrobert

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Thread Starter #11
I hope mine will also I just dont think I enough a burnout after the first time with my 305 I do a good burnout with them at first after dont do much more haze them and they hook
 




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