mowe

Goals : quarter and half mile runs

I recently bought the new 18x12 reproduction Z06 wheels for my Z. I currently make about 750whp and 730tq.

Here are the two sizes I am struggling with and wanted opinions on what would be best for my set up.

325/40/18
Or
345/35/18


Both are an M&H radial....

Thanks!

mcd_57

I would also like to read some opinions on this.

Question...were these the 18x12 repros from Bob that will fit over big brakes? If so, do you have an opinion on them yet? You haven't, by chance, test fitted them without tires, have you?

Travis

lotti

I also have the replica 18x12 with 345 MT. Haven't been to the track yet but still spin on street but hook better than stock. I haven't aired them down yet and really heated them should make a good difference. Was able to see a 2.7 0-60 on my PDR, will post video whenever I bring laptop home and download. These tires came off my Viper pratically new, and I have no expiernce with M&H, but I would get the Hoosier 335. They are a little shorter (helps with gearing ) than stock but hook like crazy closest thing you can get to a slick. Downside not great around corners softer sidewall, rain forget it.

C7/Z06 Man

I'm tired of putting down 1.53 60 ft. times on my stock MPSS tires!

So I purchased a set of those shinny chrome 18"X12" replicas and began looking at all that was out there that could really be driven on the street, track, and even if I get caught in the rain somewhat safely. However my main concern is traction with a better et & mph. Taking all things into consideration the answer for me was MT drag radials.

Two sides I considered were the 345 and the P305/35R18's that are 26.6" tall (same as stock) and 5 lbs. lighter per tire than the 345's. The 345's are also 27.8" tall. I also think either tire will hook at the track so in the end for me it was really a no brainier to go with the 305.

I have run narrower MT street drag radials in the past and 1.4's where no problem for my air conditioned V6 Buick.

lotti, If you would let us know what your track results are.

keith954

Either one will work and they are both 28" from M&H. The 325's is more recommended for the 18x12 but I put the 345's on an 18x12 and never had an issue on my old Gtr.

mowe

It seems like I'm good either way...

I was worried the 345 would be too heavy/much. They say the M&H run a little small so the 325 really likes an 11"wheel and the 345 is perfect for th 12".

Ben@WeaponX

I've ran all of these above except for the new M&H 345. The MH 325 is a narrow 325 and yes it did sit well on my old 18x11s. They also rubbed inside the wheel well behind the wheel where the hatch compartments are.

I have the wide body on now and run a 18x12.5" Forgeline with the MT345 (which is 27.5" tall) but those are actually a heavy tire. Each one weighs 38lbs compared to the Hoosier 335 which is shorter at 26" but weights only 26lbs. So, that's nearly 100lbs of static weight difference between the two when you take into account rotational mass and tire circumference. So, I just switched over to the Hoosiers 335s to see how they'll do.

Before these wheels, I had another 18x10.5" setup with the 26" Hoosier 315 and it was hooking in the low 1.4s on that at over 900whp so I have no concerns going to the Hoosier 335. I don't recall what the Hoosier 315s weighed.

For the MH, the 325 has carried some of my CTS V clients into the 1.3Xs so MH makes a great tire too. I'd be curious of the weight of the MH 345 though and also wondering if the 28" height will get into the fender liner like the 325s did.

The 345s definitely LOOK the best, but I couldn't get over the weight difference since old school drag rules tell you 100lbs is a tenth

I offer full drag setups with tires etc so let me know if any of you guys need some help

MH 325s




Hoosier 315s



MT345s









Attachment 48361975

Attachment 48360803

Attachment 48360799

Norcal's MH345s on the Forgelines I did for him



Hoosier 335s aren't on the car yet but here's a comparison to the MT345














Just for comparison on different street tire sizes:
Pirelli 375 rears (which are 26.9" tall by comparison) I did on a set of PUR LX11s for Aaron's wicked Z





Another 375 26.9" setup on Darryl's Z I did 360 Forged on



Pirelli 355 rears at 28" on my C7

Thomasmoto

I also used to run turbo V6 Buick's back in the day. I really miss how well those cars would hook. I always knew that when my casette tapes would fly out of the player and go all the way to the back seat that I got a great 60'!

mowe

Are you thinking the 345 will run on my Z? Not sure why if that tire should run narrow... Was it a C7 Z that had rubbing issues?

Ben@WeaponX

I reached out to Tony to see what he says if the MH345s rubbed, and he said they did. That doesn't surprise me since the 325s did and I'm sure the 345s somewhat modeled from them. It's not a huge issue with the rubbing, it was behind the fender liner is the same on narrow and wide body so you'd rub either way. The 325s didn't rub for everyday driving but loaded down on the dyno they did as well as on the launch when the rear wheels cambered.

The MT345s are shorter according to the website stated description. I ran those personally and they do not rub.

mowe

Did you like the MT ?

Ben@WeaponX

Yes the MT345 aside from the weight is a great tire! Very streetable and hooks well. I just changed due to the weight but I don't care about driving on the street with them anyway.

lotti

MT 345 on my car now they do not rub with rims I have. I will agree with Ben they are heavy and taller than stock. Any of these tires will hook people run way faster times then we are talking about on all out drag cars. I am going back to the Hoosier they look like crap on the car because they are so short, but the difference in weight and height really wake the car up feel night and day (coming from my experience on the Viper). I actually went faster in the Viper with the MT (10.58 @ 133) slower 60 than Hoosier (10.61 @ 126) gearing with taller MT I could run through in 3rd hitting limiter, Hoosier I had to go to 4th right before traps killed mph. In the Z I have been 10.7 all stock, it shifts to 5th pretty close to the line seems to kind of kill it, 4th to 5th gearing seems to drop to much RPM. I have not looked at it gearing calculator so I'm not sure which tire would be optimal, good times are all about a good set up. Maybe the MT would get you through in 4th, but if it doesn't my opinion the Hoosier would be better (theoretically better 60 and get you into 4th earlier with lower overall gear ratio). Below are some pics of stock with MT 345, stock definitely look better 18" rims make the design look swished down IMHO. Too hot where I live not going to the track anytime soon.

mowe

Going with the MT. Thanks all !

lotti

[QUOTE=mowe;1592637532]Going with the MT. Thanks all ![/QUOTE

I stand corrected just put stock tires back on and the MT 345 rubbed in the fender wells on top of the tire pretty significant. Actually broke through the carpet material a little bit. I am lowered all the down on stock bolts

mowe

Ugh... Maybe I should raise it a bit. Did you get an alignment after you put them on?

C7/Z06 Man

MT tires just arrived, took a rough measurement of contact area which looks to be approx. 3/4" less than OEM. Height looks the same with more side wall. Total Shipping weight = 64 LBS.

mowe

They look good. I did 335 though.

lane_change

I am on the Hoosier 335. I have been debating switching to a taller tire, but like many here have stated, the added weight of the MT is just crazy at 12lbs extra per tire. My car seems to run hard down low on the Hoosiers, but based on the calculators, the car will shift into 5th around 124mph (6500 rpm) on the Hoosier vs. just over 130mph on a 27.5" tall tire which is what I believe the 345/35R18's measure out to be, even though the website for MT claims a 27.8" and MH claims a 28". The 325 MH is just over 28" at 28.2" I believe.

My car has been trapping around 138-139mph however, so I will be in 5th regardless of what I do. 5th is simply too tall of a gear imo for strong acceleration. I just don't know if giving up some torque down low with a bit more pull in each gear would be a worthwhile trade for the street....but I think for the track, the Hoosier is still king of the 18" world.

Ben@WeaponX

THUNDER CATS HOOOOO! LOL man that took me back to my childhood after school! Thanks