20s vs. 22s Wheels/tires with regards to speed

[jfayardiii]

Guys, I'm looking to get some wheels/tires for my car which is currently getting modded. I will be about 500hp at the wheels when done and would like to get some feedback from those that have experience regarding 20 vs 22 wheel tire setups and the supposed reduction in speed.

Is the reduction in speed going to be something that I'm going to notice on the street? What are we talking, 2-3 10ths at the strip? Just trying to put this in prospective.

Thanks ahead for your time and knowledge.

[SS_Diaz]

gooood ?.. i was wondering the same thing

[zkdreads]

if your going to the drag strip. stick with 20's u need more meat on those tires. plus bigger rims are heavier. i have 24s on mine. but im not racing it at all. sounds like your going more performance so i would stick with 20's or get 22's and have 20s to fall back on when your going to the strip

[SRT10KLLR]

Went from a 12.17 @ 118 on stock 20's with DR's to 12.30 @ 113 on 22's with street tires. But that is not a really good apples to apples comparison. The cam and heads were swapped between those runs although the hp/tq remained relatively close. Also, the difference between the DR's and street tires can make a big difference in 60ft and 1/4 mile times.

[SGOS252382]

Originally Posted by SRT10KLLR

Went from a 12.17 @ 118 on stock 20's with DR's to 12.30 @ 113 on 22's with street tires. But that is not a really good apples to apples comparison. The cam and heads were swapped between those runs although the hp/tq remained relatively close. Also, the difference between the DR's and street tires can make a big difference in 60ft and 1/4 mile times.

Crazy comparion. Different cam and heads for starters, but your numbers are a little mixed.

You seemed to have hooked up better with 22" wheels and street tires. Because running 12.30 @ 113 mph would require a pretty darn good 60' time.

Then you only ran 12.17 @ 118 mph with 20s and drag radials. That would indicate a slower 60' time.
Most cars trapping 118 mph (running drag radials) are deep in the 11s in the 1/4 mile.

[Parag]

to answer the question, the smaller wheels will have more sidewall. that means bigger patch. so at the strip the 22s will will slip more, and will be more unpredictable to grab.
on the street, youll never notice. you still have a fast car.

[SGOS252382]

Size and weight does matter, but you can minimize the effects if you run lighter weight 22" wheels. But if you put 50 lb per wheel, 22" wheels on your car you will notice it.

And ask PQ about his car and how it performs now that he put 20" wheels on it. He is very vocal about how poorly his car performed with bigger/heavier wheels.

[jfayardiii]

I'm looking at tsw doningtons in either case with invos so Im thinking weight difference will be negligable.

[mntgome1]

As said above.... On the Street the 22's will be fine but keep your factory 20's for the strip....

[DJ UNKNOWN]

Originally Posted by Parag

to answer the question, the smaller wheels will have more sidewall. that means bigger patch. so at the strip the 22s will will slip more, and will be more unpredictable to grab.
on the street, youll never notice. you still have a fast car.

Exactly...... what he said

[SRT10KLLR]

Originally Posted by SGOS252382

Crazy comparion. Different cam and heads for starters, but your numbers are a little mixed.

You seemed to have hooked up better with 22" wheels and street tires. Because running 12.30 @ 113 mph would require a pretty darn good 60' time.

Then you only ran 12.17 @ 118 mph with 20s and drag radials. That would indicate a slower 60' time.
Most cars trapping 118 mph (running drag radials) are deep in the 11s in the 1/4 mile.

If the runs were in the East Coast then I am pretty sure it would have been in the 11's but here in California it never happened.


Here is a comparison of my previous best vs the new times.

Old Setup
Car/Engine: 2SS/RS w/L99
Top Ten Class: Internal Engine Mods plus Bolt-Ons
Tires used on the pass: Nitto NT555R 305/40/20 Drag Radial Rear; Stock Fronts
Performance Mods: Engine/Heads/Cam, Headers, Exhaust, CAI, Converter, Tune.
Name/Location of the track: Auto Club Dragway
Date of pass: 2/28/2010
Weather conditions: OK

New Setup
Car/Engine: 2SS/RS w/L99
Top Ten Class: Internal Engine Mods plus Bolt-Ons
Tires used on the pass: Nitto NT420S 295/30/22 Street Tire Rear; NT 420S 265/35/22 Fronts
Performance Mods: Engine/Heads/Cam, Headers, Exhaust, CAI, Converter, Tune.
Name/Location of the track: Auto Club Dragway
Date of pass: 10/29/2011
Weather conditions: OK


NA
...................Old Setup.........New Setup
R/T:................... .128 ................ .057
60':.................. 1.863 ............... 1.893
330':................. 5.212 .............. 5.213
660':................. 7.918 .............. 7.967
660’ mph:.......... 91.16 ............... 89.52
1000'............... 10.229 ............. 10.319
1320'............... 12.172 ............. 12.300
1320’ mph......... 117.58 ............ 113.63
DA....................1350ft ............. 2200ft
Corrected ET..... 11.995 ............ 11.985
Corrected MPH.. 119.344 .......... 116.687

So I went faster with the new setup even though I was running 22" wheels with street tires and had 100lbs of junk in the truck, lol. Also, the dyno shows it lost a lot of tq down low and gained 7hp with the new cam. The potential was there(see MPH) in the old setup to run 11's but the tranny was hanging up at every shift.

The new tranny tune that Tampa Tuning sent me was the turning point it shifts quick and firm.


Nitrous(100)
...................Old Setup.........New Setup
R/T:................... .657 ................ .147
60':.................. 1.889 ............... 1.912
330':................. 5.075 .............. 5.040
660':................. 7.633 .............. 7.604
660’ mph:........... 96.94 .............. 96.55
1000'................. 9.846 .............. 9.794
1320'............... 11.726 ............. 11.641
1320’ mph......... 120.54 ............ 122.13
DA....................1548ft ............. 2896ft
Corrected ET..... 11.525 ............ 11.238
Corrected MPH. 122.682 ........... 126.605

Here is a dyno comparing the old VVT cam vs the new non-VVT cam. Only two things changed were the cam and the heads. The new heads are LSA's with a bigger chamber to lower cr(10.38 vs 9.28) vs the old L92 heads. You can clearly see I lost a lot of low end tq getting rid of the VVT. The only reason for the change is to be able to run a lot of boost.

Same dyno just different days. Blue is VVT Red is after LS3 conversion.

[SGOS252382]

Originally Posted by SRT10KLLR

If the runs were in the East Coast then I am pretty sure it would have been in the 11's but here in California it never happened.


Here is a comparison of my previous best vs the new times.

Old Setup
Car/Engine: 2SS/RS w/L99
Top Ten Class: Internal Engine Mods plus Bolt-Ons
Tires used on the pass: Nitto NT555R 305/40/20 Drag Radial Rear; Stock Fronts
Performance Mods: Engine/Heads/Cam, Headers, Exhaust, CAI, Converter, Tune.
Name/Location of the track: Auto Club Dragway
Date of pass: 2/28/2010
Weather conditions: OK

New Setup
Car/Engine: 2SS/RS w/L99
Top Ten Class: Internal Engine Mods plus Bolt-Ons
Tires used on the pass: Nitto NT420S 295/30/22 Street Tire Rear; NT 420S 265/35/22 Fronts
Performance Mods: Engine/Heads/Cam, Headers, Exhaust, CAI, Converter, Tune.
Name/Location of the track: Auto Club Dragway
Date of pass: 10/29/2011
Weather conditions: OK


NA
...................Old Setup.........New Setup
R/T:................... .128 ................ .057
60':.................. 1.863 ............... 1.893
330':................. 5.212 .............. 5.213
660':................. 7.918 .............. 7.967
660’ mph:.......... 91.16 ............... 89.52
1000'............... 10.229 ............. 10.319
1320'............... 12.172 ............. 12.300
1320’ mph......... 117.58 ............ 113.63
DA....................1350ft ............. 2200ft
Corrected ET..... 11.995 ............ 11.985
Corrected MPH.. 119.344 .......... 116.687

So I went faster with the new setup even though I was running 22" wheels with street tires and had 100lbs of junk in the truck, lol. Also, the dyno shows it lost a lot of tq down low and gained 7hp with the new cam. The potential was there(see MPH) in the old setup to run 11's but the tranny was hanging up at every shift.

The new tranny tune that Tampa Tuning sent me was the turning point it shifts quick and firm.


Nitrous(100)
...................Old Setup.........New Setup
R/T:................... .657 ................ .147
60':.................. 1.889 ............... 1.912
330':................. 5.075 .............. 5.040
660':................. 7.633 .............. 7.604
660’ mph:........... 96.94 .............. 96.55
1000'................. 9.846 .............. 9.794
1320'............... 11.726 ............. 11.641
1320’ mph......... 120.54 ............ 122.13
DA....................1548ft ............. 2896ft
Corrected ET..... 11.525 ............ 11.238
Corrected MPH. 122.682 ........... 126.605

Here is a dyno comparing the old VVT cam vs the new non-VVT cam. Only two things changed were the cam and the heads. The new heads are LSA's with a bigger chamber to lower cr(10.38 vs 9.28) vs the old L92 heads. You can clearly see I lost a lot of low end tq getting rid of the VVT. The only reason for the change is to be able to run a lot of boost.

Same dyno just different days. Blue is VVT Red is after LS3 conversion.

You have two completely different setups with different HP/TQ numbers. So this really isn't worth comparing track times.

But one thing that pops out is your 60' times. With drag radials and a converter, your 60' time should be significantly faster than running 22" street tires.

With 305/35/20 NT555R drag radials (bolt ons) I can pull 1.74 - 1.77 sec all day long.
If I put 22" street tires on my car I'd be lucky to 60' in the 1.9 sec range.

That's where you should see the difference, but for some reason you're not.

[Ucantctchme]

I went 12.7 @113 with. 2.1 60ft with stock wheels/tires. Then swapped to
22s and went 13.0 @113 with a 2.1 60ft. No other changes were made.