Drag Radial opinions
Thread Starter
Racer
Joined: Mar 2013
Posts: 468
Likes: 26
From: Ok/Tex
Drag Radial opinions
I'm considering changing my MT ET 305 35 18 rears to the 305 40 18 which I believe is a slightly taller tire. What can I expect from the switch?
Also, my car is a base model, but I had widened 18inch rims to 11 inches. I wonder if I could get away with a 315 or 325 tire?
A6 cammed & sprayed w/stall.
Also considering the Hoosier A7, but I don't have experience with them.
Also, my car is a base model, but I had widened 18inch rims to 11 inches. I wonder if I could get away with a 315 or 325 tire?
A6 cammed & sprayed w/stall.
Also considering the Hoosier A7, but I don't have experience with them.
Last edited by thehulk; Sep 24, 2017 at 10:16 PM.
Drifting
Joined: Feb 2014
Posts: 1,418
Likes: 267
From: Pontiac Quebec
I'm considering changing my MT ET 305 35 18 rears to the 305 40 18 which I believe is a slightly taller tire. What can I expect from the switch?
Also, my car is a base model, but I had widened 18inch rims to 11 inches. I wonder if I could get away with a 315 or 325 tire?
A6 cammed & sprayed w/stall.
Also considering the Hoosier A7, but I don't have experience with them.
Also, my car is a base model, but I had widened 18inch rims to 11 inches. I wonder if I could get away with a 315 or 325 tire?
A6 cammed & sprayed w/stall.
Also considering the Hoosier A7, but I don't have experience with them.
Thread Starter
Racer
Joined: Mar 2013
Posts: 468
Likes: 26
From: Ok/Tex
Drifting
Joined: Feb 2014
Posts: 1,418
Likes: 267
From: Pontiac Quebec
the taller tire will give you some sidewall flex, but it will also hurt the gearing a bit for launching. I use a 315/35R17 like so many others (hoosier DR2) and have had great success so far. good lasting tire, as I get about 100-120 passes out of a set. I don't know what kind of power you have but you probably don't need to go wider than 315. a 275/40R17 can still hold about 550rwhp.
Drifting
Joined: Feb 2014
Posts: 1,418
Likes: 267
From: Pontiac Quebec
Drifting
Joined: Feb 2014
Posts: 1,418
Likes: 267
From: Pontiac Quebec
seen many cars in the 9s using the 315. if your goal is 10s they should be plenty. maybe you should see if you can borrow a 17 and see if you like it. But I'd find it hard to believe that you wouldn't.
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Race Director
Joined: Sep 2007
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From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
I'm guessing you don't have a big stall converter and then the tall tires are not doing you any favors either. My N/A bolton runs 6.9-7.0 with 275 Hoosiers at less HP, so you have something wrong. What are your 60' times?
Thread Starter
Racer
Joined: Mar 2013
Posts: 468
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From: Ok/Tex
so I assume the motor just can't turn the converter like it needs to, due to lack of power. But i still get 1.65 60fts N/A
the 100 shot was with a AF ratio of 10.3
Last edited by thehulk; Sep 25, 2017 at 01:04 AM.
Race Director
Joined: Sep 2007
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Likes: 2,108
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
well I fucked up when I ordered the stall. It's a 3600 stall but they asked me what hp I was planning on running with the setup. I told them 800rwhp so they built it assuming I'd have that. Well life got in the way and i wasnt able to supercharge it like I planned.
so I assume the motor just can't turn the converter like it needs to, due to lack of power. But i still get 1.65 60fts N/A
the 100 shot was with a AF ratio of 10.3
so I assume the motor just can't turn the converter like it needs to, due to lack of power. But i still get 1.65 60fts N/A
the 100 shot was with a AF ratio of 10.3
Thread Starter
Racer
Joined: Mar 2013
Posts: 468
Likes: 26
From: Ok/Tex
Those 60' times are pretty weak even for a 3600 stall at your power level. It might partially be the tire size, but I'm guessing it's mostly in the tune. Just for reference, when I was running a 3600, the 60' was in the 1.56-1.62 range. Other than tuning, the mods were a CAI, ported TB, Z06 exhaust manifolds to mufflers, skinnies, and DR's. The ET's were mostly in the 11.0 to 11.2 range with a PB of 10.82. I'm not bragging, but just showing you a comparison to help you identify problem areas.
no you're right brother. I knew something was wrong from the get go. But PatG tuned it, and I have the graphs that show 464rwhp.
I was under the impression I had enough rwhp for a low 11, high 10 second pass. But when I ran a 7.4@93 I was like wtf. The shop who did my work is super ******* sketchy but my baseline was like 340rwhp so I know I picked up the hp from all the mods.
which left me to the only other thing, my stall converter. I got it brand new, custom ordered. It has to be the stall converter right?
when I ran the 6.9@103 with the 100 shot, my converter snapped the rpms beautifully. I figured the extra rwhp made it to where the converter could actually do it's job. I'm also running an iron block, which is 100lbs heavier.
the car is a 10:1 compression, with 2 step closer plugs. So it's not "optimal" for NA but, I agree. I should be running faster then 7.4
I just bought some skinnies, so I assume that will help the weight transfer .
Drifting
Joined: Feb 2014
Posts: 1,418
Likes: 267
From: Pontiac Quebec
no you're right brother. I knew something was wrong from the get go. But PatG tuned it, and I have the graphs that show 464rwhp.
I was under the impression I had enough rwhp for a low 11, high 10 second pass. But when I ran a 7.4@93 I was like wtf. The shop who did my work is super ******* sketchy but my baseline was like 340rwhp so I know I picked up the hp from all the mods.
which left me to the only other thing, my stall converter. I got it brand new, custom ordered. It has to be the stall converter right?
when I ran the 6.9@103 with the 100 shot, my converter snapped the rpms beautifully. I figured the extra rwhp made it to where the converter could actually do it's job. I'm also running an iron block, which is 100lbs heavier.
the car is a 10:1 compression, with 2 step closer plugs. So it's not "optimal" for NA but, I agree. I should be running faster then 7.4
I just bought some skinnies, so I assume that will help the weight transfer .
I was under the impression I had enough rwhp for a low 11, high 10 second pass. But when I ran a 7.4@93 I was like wtf. The shop who did my work is super ******* sketchy but my baseline was like 340rwhp so I know I picked up the hp from all the mods.
which left me to the only other thing, my stall converter. I got it brand new, custom ordered. It has to be the stall converter right?
when I ran the 6.9@103 with the 100 shot, my converter snapped the rpms beautifully. I figured the extra rwhp made it to where the converter could actually do it's job. I'm also running an iron block, which is 100lbs heavier.
the car is a 10:1 compression, with 2 step closer plugs. So it's not "optimal" for NA but, I agree. I should be running faster then 7.4
I just bought some skinnies, so I assume that will help the weight transfer .
As far as 60fts go, I gotta let Tom here help ya as I'm more familiar with manual and their gears but I agree you should be seeing better if you're hooking well.
Thread Starter
Racer
Joined: Mar 2013
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From: Ok/Tex
Definitely would be nice to log a few passes and see if you're car is pulling timing back hard. Do you data log your runs?
As far as 60fts go, I gotta let Tom here help ya as I'm more familiar with manual and their gears but I agree you should be seeing better if you're hooking well.
As far as 60fts go, I gotta let Tom here help ya as I'm more familiar with manual and their gears but I agree you should be seeing better if you're hooking well.
Drifting
Joined: Feb 2014
Posts: 1,418
Likes: 267
From: Pontiac Quebec
Going back to tires for a second the 315-35 r17 hoosier DR2 that I run have gone as low as 1.2x as far as I know. not me of course as my PB is 1.396 but it`s just to show you how capable they are.
You should talk to your tuner and hopefully you can send him some of those logs and let him see if everything is as it should be. remember to allow the car to cool in between runs and don`t bother going on blistering hot days. It does no good to the car and you won`t be making new PB`s
Last edited by rpmextra; Sep 26, 2017 at 01:52 AM.
Thread Starter
Racer
Joined: Mar 2013
Posts: 468
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From: Ok/Tex
i`m far more familar with Hp tuners but maybe HOXXOH knows more.
Going back to tires for a second the 315-35 r17 hoosier DR2 that I run have gone as low as 1.2x as far as I know. not me of course as my PB is 1.396 but it`s just to show you how capable they are.
You should talk to your tuner and hopefully you can send him some of those logs and let him see if everything is as it should be. remember to allow the car to cool in between runs and don`t bother going on blistering hot days. It does no good to the car and you won`t be making new PB`s
Going back to tires for a second the 315-35 r17 hoosier DR2 that I run have gone as low as 1.2x as far as I know. not me of course as my PB is 1.396 but it`s just to show you how capable they are.
You should talk to your tuner and hopefully you can send him some of those logs and let him see if everything is as it should be. remember to allow the car to cool in between runs and don`t bother going on blistering hot days. It does no good to the car and you won`t be making new PB`s
Im gonna make some runs this weekend. I'll get them logged.
Back to tires, the hoosiers sounds good. What would the 315/30/18's do for my converter issue?
Race Director
Joined: Sep 2007
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From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
I'd also like to see what your timing is doing for the full pass.
If you still have some life left in your current tires, let's see what else is happening, before buying new ones.
Thread Starter
Racer
Joined: Mar 2013
Posts: 468
Likes: 26
From: Ok/Tex
I'm not familiar with EFI either. I suspect your converter is set up like a PAS from Yank. When you ordered it, you said you were planning on 800hp FI. Let's look at a chart scan of your launch RPM with throttle position through the 1-2 shift and compare to the 60' and 330' time.
I'd also like to see what your timing is doing for the full pass.
If you still have some life left in your current tires, let's see what else is happening, before buying new ones.
I'd also like to see what your timing is doing for the full pass.
If you still have some life left in your current tires, let's see what else is happening, before buying new ones.
thank you guys for the help.
Thread Starter
Racer
Joined: Mar 2013
Posts: 468
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From: Ok/Tex
Went to the track, the tires are still good �� the vht sure helped!
1.63 60ft N/A personal best.
7.45 1/8th personal best
93.15 mph
DA was around 2200
Cant wait to run it on the juice.
1.63 60ft N/A personal best.
7.45 1/8th personal best
93.15 mph
DA was around 2200
Cant wait to run it on the juice.
Last edited by thehulk; Oct 6, 2017 at 05:00 AM.