I was on ET Streets for the first time (first time without breaking, anyway) and I realized i should have been running everytime i went to the strip. I really liked them. All the details can be found here: https://www.rx7club.com/racing-kills-lounge-10/fd-vs-fd-zinx-vs-radkins-%2Avids%2A-%2Apics%2A-more-648037/

But anyway, I started off at 15 psi and then backed it down to 13 psi tire pressure. They would do pretty well with a big slip off the line and spin a little in first and then some more when i would bang second on low boost. If i would try a really fast slip or any sort of high rpm drop they would spin.

When i cranked the boost up to 21-22 they would spin like crazy in first and all the way through second. I didn't have a chance to really mess around with them at that high boost because my meth wasn't flowing the correct amount, so i backed the boost back down to 15 for the rest of the day.

The et streets are 26'' x 10.5'' - 16''LT on stock FD rims. Is this just too small of tire for my power level? Should i lower the pressure more? Should i change the way i launch? My best 60's were in the 1.8s, which i know should be alot better.

 

You can lower the pressure down to about 10psi before they satrt to get weird when you are shutting down on the big end. Its good to start at 15psi like you did, and drop 2 psi or so till you see the 60 foot get worse. Have someone at the starting line to watch the rubber that you lay down, the right pressure will be a dark strip all the way across, too much pressure will be dark in the center, and lighter in the edge, too little pressure will be lighter in the center, with dark lines on the outside of the patch. Even on the too low of pressure side, it may 60 foot better cuz you are wrinkling the tire better.
BTW, I'm not experienced with a IRS car with slicks, but I cant see slipping the clutch being good for it. Will it break the rear if you dump it? I think it would be more consistant and 60foot harder if you dumped it. Usually, you have to shock the suspension to get it to "set", driving the tire into the ground. Just my thoughts.

 

You aren't overpowering the tires and tire pressure isn't your problem. Also, you don't need to worry about slipping your clutch because of turning the tire. You have problems someplace else.

Are you warming up the tires good ? How old are the tires ? How is the track prep? Are other cars hooking up ? How is your suspension setup?

 

I tried a short burnout in 1st up to a decently long and smokey 2nd gear burnout with the same outcome. The tires aren't even a year old, yesterday was the only real passes they have made. They got hot one other time when i did a burnout and broke an axle on the line.

The track prep was good, there were multiple 10 second cars there, but of course some said it sucked, with a few of the mustangs pulling the front wheels.

My suspension is the stock R1, and i know this is somewhat of a limitation.

 

Well, you obviously have a problem. Stock suspension isn't the problem, tires aren't the problem. Possibly the driver ?

Were you lining up in the groove ? The difference in a few inches could be a tire yanking dead hook or a tire roaster.

If everybody spins, the track is junk.

If even ONE CAR hooks up, everybody else is doing something wrong.

 

Spinning out of the hole on e.t. streets seemed to be the fastest way to launch my car. I was not getting spectacular 60' times though, and my car makes, probably 100HP less than yours. I had 255-50-16's on stock supra wheels.

I found I got the best launch with around a 5K clutch dump in 1st, I'd powershift into 2nd at 7500 and the wheels would hop 2-3 times before hooking if I wasn't in the groove, and they'd deadhook if I was when shifting into 2nd.

Being dead nuts in the groove sure helps a ton.

I wasn't heating my tires up much and I think I was running around 10psi. This year, slicks and skinnies.... no more messing around.

 

zinx im running the 11.50 et at 15 psi 7,000 rpm launch and getting 1.53 60 ft. Are you getting the nose up or is it comming out flat? I suggest preloading suspension not just side stepping clutch as you know what happens there. The only thing that i have that you probley dont have is 14 year old struts. I know your car has tons of power and if it hooks its going to fly!!!! What was your times?

 

It definitely could be the driver, it was my first time out this year and my first time out on et streets so there is no argument there.

I'm pretty sure i was in the groove, but i was trying to pay attention to so many thing that i may have been off by a couple inches, i didn't know it made that much of a difference.

 

I never dumped the clutch all day for fear of breaking something, but next time out I'm going to try harder launches to make the rear sit more. I'll have to practice pre-loading with the ebrake.

 

The nose felt like it was coming up, but looking at the pics and vids, it really wasn't all that much, especially for a stock suspension. I've got 14 year-old struts! I think most of it comes down to me needing more practice and experience.

 

Your right about that alot of lesser cars are faster becouse the driver knows the car and can get the most out of it. The first day i ran the new setup i ran 12.0-11.70-10.84 and then was told get a cage. I think with tunning and tweeking its got a 10.5 in it.

 

Another thing to mention is that M/T ET Streets are bias ply... and if you are running radials up front you will be getting some squirrely handling at the end of the track which can make for a big pucker factor.

Get some 16x4 FD spares and mount some weight rated and speed rated motorcycle tires on them. They are about $50 each from eBay.

Worn out stock suspension is about perfect for the strip. Remove your front sway bar for the track if you haven't already. Helps weight transfer a ton.

As suggested watch where the previous few cars have launched from and you'll the prominent "groove" where it is the blackest from everyones tires. Line up in there and stay in it.

 

I went back to the track tonight, and figured them out.

Pulled a 1.68 60' and ran 11.18 @ 128. I'll post all the details and a vid later.

 

Thats good news. Grats dude.

 

hell yeah, let us know what you did!

 

Here is the vid along with the whole slip: https://www.rx7club.com/showthread.php?p=7002278

The reason i was spinning last time was that i was using a piece of **** pressure guage and the tires had a lot more in them than i thought, like high teens or even 20 psi.

The 1.68 60" was with 12 psi in them. They did wiggle quite a bit, so i may put a little more in them next time and see if they still hook as well.

 

The wiggle comes from the fact that you are running fat radials in the front. Get bis skinnies before you put your precious FD into the wall. There are countless account of cars getting squirly because of the tire mismatch.

Contact CCW. They have a Firestone 16" diameter skinny that all the Vette and Viper guys use. mount them on some spare wheels and you are good to go.

Andrew

 

That's a damn fast trap, congrats

 

I was going to start to look for front skinnies today. Do you have a link to these tires?

 

M/H has front runners witch are drag only and coker antique tire co have the firestone street tires like the supra and vette owners use. I like M/H for the track best. jeggs summit and others sell M/H about 122.00 each.

 

4th one on the list here? http://www.jegs.com/webapp/wcs/store...52031_-1_36680

What is the size of the spare wheel?

 

neat, never thought of mounting them on stock spare wheels. Can those wheels hold up on high hp applications? either fd or fc spares.

 

Zinks the wheel will fit the 4.50 / 16. I think you can get them cheaper at MandHTires.com, but with shipping im not sure. hondahater those wheels were used on almost all the early fd drag racers cars i think even Ari and Adam used them in the beggining. Let me know if you get them cheaper as after the 7 gets painted in three weeks ill be looking into getting a set.

 

You have a lot more left in that 60'. I assume you removed the front sway bar?

I was cutting 1.8x 60' times on road race suspension and 7 year old 245/50/16 Nitto DR's.

When you dial that car in you should be cutting some 1.4x 60' times. Remove the front sway bar, be consistent with your burnouts (how long), line up in the groove, and figure out your launch technique (build a little boost at the line).

 

so why take off the front sway bar again? Nice thread by the way I'm learning all sorts of stuff