Iam thinking of M&H slicks 23.0 X7.5 -15 .

for you 1/4 racers out there whats your opineons on these?

 

I've got the same thing but wider. 23X8.5 M&H. It worth going with 8.5 instead of 7.5. The 23's are on the verge of breaking loose with a high clutch dump. Good enough for a 1.7 60 foot (with a 6000-6500 clutch dump). I hope you have a good clutch though.

 

yeah i think the 8.5 will be much better but iam also thinking of the 24.5x8.5's dont know which ones to get. I dont know if the lower 23" gearing is worth the 4th shift or get 24.5 and stay in 3rd.
I wanted 24" slicks but i cant find one . and also i wont be doing any 6000-6500rpm dumps 4700-5000 will be fine

 

If you're going to be trapping 108-109 like SR20DEN eventually, might as get 23's and shift into 4th. At 103 mph on 23'' slicks, I finish around 5500-5600 in 4th gear, so if the mph goes up, you'd finish at 6000. I know that's what I'll do because 6k is right at peak power, plus my 3rd gear is a little more agressive, so it may be 6100-6200.

 

Yeah figure out what you realistically think you will be trapping and then decide on the diameter from that. I opted to go with a 26 back in the day because I would be just barely into 4th with a smaller size which is stupid (shifting in the last 100 or so feet) so went with the taller ones to stay in 3rd.

 

After giving it much thought, I'll go with the 24.5's and stay in 3rd gear with an extended rev-limiter (7300 Rpm, probably).

Here's a gear calculator (used):
http://fatboyraceworks.com/gears/ind...raph&Compare=1

I typed in all of my exact gears. 1st column is stock street tires with stock rev limiter (101 mph in 3rd gear).

Second column is 7300 rev limiter and 24.5 slicks. The 3rd gear goes up to 109.46 mph, which is plenty for a while. Even at 7100 I could still get 106.46 out of 3rd gear.

What I'm gonna do is sell the 23's (they only have 50 runs on them) and get rid of the sawblades, then replace them with 24.5's and lightweight 15-inchers when I do the tuning and bump up my rev limiter.

 

i justed clicked on that gear site the gear ratios what are they from 95-99 tranny? because the oo gearing is
3.29
1.85
1.27
0.95
0.80

 

ok check this out i did it for me with my 01 gearing and 23.0 and 24.5 inch

http://fatboyraceworks.com/gears/ind...raph&Compare=1


so 23" it is for me

 

5th gen trans has the same gear ratios as 4th gen.

Looking at the info you put in, I'd say you should go with the 24.5s based on your trap speeds. I'm going to assume you will trap about the same as SR... 108ish. Which means you will actually get to about 110mph by the time you cross the finish line. If you went with the 23" you would have to shift like 100 feet from the finish line, whereas with the 24.5s you can run out 3rd and you've still got room for a few more mph of trap if your car gets even faster.

 

I know nothing about slicks but how and why would my traps be so high ?! My best trap to date is 103.99 with 23.9 inch DR's .

the ratios i put in is what nissan told road&track when the car was being tested ,they dont match what jclaw had

 

Don't forget, trap speed at the track is averaged over the last 60ft, and is always lower than the actual speed you are going when you cross the line, it can be 3-4 mph different.
for example: it tells me on my street tires that 3rd gear is good for 106.5mph. Last time at the track, I was trapping just shy of 103 mph, and I was hitting the rev limiter 50-100ft ft before the line in 3rd gear.

I think the 23 inch slicks are too small for you.

 

Mine are slightly different because I have a 00 Altima's 1-3 gears.

BTW, does anyone know how safe this is? I would shift at 6800-6900 in 1st and 2nd, and ride out 3rd to about 7000-7100. My VQ35 is stock (no rod bolts).

Slicks take away from trap speed. Especially 23-inchers. The car definately feels slower in the second 1/8th mile than with street tires, because there is no sidewall and 13 psi in the slicks. 24.5 would keep aggressive gearing, be easier to launch (more sidewall, and better for top end than 23's), spin less or not at all, and allow to ride out 3rd.

Last weekend at the track I had to dial in a 14.00 because I forgot my helmet and you need one to run 13.99 or faster. So I usually passed the slower car slightly after the 1/8 mile mark, then I would just hang there and play with the gas, and not shift into 4th as I usually do. I was trapping 90-91 mph hitting (or almost) the rev limiter (6550) in 3rd gear with my 23-inch slicks. This agrees with the calculator.

The funny thing is that I won the event in street class. 14.03 at 69 mph slamming on the brakes on my 14.00 dial-in

 

I don't lose a single bit of trap speed on my slicks. My traps were identical on slicks and street tires. Probably attributed to the weight difference between the slick setup and street tire setup.

Krismax I thought you would be trapping that high because you put some more mods and lightened up your car some more? If not then I guess my recommendation is off, I don't have time to look at it right now again though.

 

Yeah, but I use the same wheels for both slicks and street tires (sawblades, 19 lbs each). The thing with 23 inch slicks mounted on 15-inch wheels, and especially 8.5 inch wide slicks mounted on 6.5 inch wide wheels, is that the wheels almost touch the ground since the sidewall is almost non-existant.

24.5 or 26-inch slicks actually have a sidewall and are similar in diameter to the stock tire (25.2'' for me), so those might be an entirely different story.

 

Apparently M&H sells a 14-inch version of the slicks; 25.5x9.0. Not only are they 9'' wide and pretty much stock tire height (25.5 inches), but 14-inch wheels would reduce wheel weight and bring the weight closer to the center, not to mention a whole lot more sidewall and they'd be sticker for the launch.

Does anyone know if 14-inch whels will fit on a 95? Will it clear the caliper?

 

I've never tried it myself, but I'm going to guess that you couldn't get a 14" wheel over the caliper. 15's are pretty dang close to the caliper as is.

 

I was going to try that too Neal but never found a 14" with the correct bolt pattern. It certainly won't work on the 5th Gen because I have to grind the calipers and the inside of the millenia wheels for them to work on the front.

 

Yes i will be over 100lbs lighter but the HP will have to wait for next year ,i have mantenience issues with my car that ive let go for two long. And i wasnt even gonna get slicks but i want to see how i do with them

 

M&H slicks 23.0 X7.5 -15

 

I guess ill get the 24.5x8.5 .I wish they had 24.0x8.5