ISC top hats and billies. - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Suspension, Brakes, Drivetrain discuss the wondrous effects of boost and your miata...

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 10-04-2013, 11:30 PM   #1
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Aug 2009
Location: Chaparral, New Mexico
Posts: 101
Total Cats: 2
Default ISC top hats and billies.

I have some R Package billies, high mileage, still have not had them rebuilt/revalved. But getting tired of blown shocks and bottoming out the shock and going to install them this weekend.

Just picked up some ISC top hats a few hours ago, 2" and 1 1/2"

Using Tein s tech springs, and the r package billies. Will I have any problems with the tophats, I am worried that it may be too much length.
SuperTuner12010 is offline   Reply With Quote
Old 10-05-2013, 12:40 AM   #2
Senior Member
iTrader: (1)
 
Join Date: Nov 2010
Posts: 951
Total Cats: -252
Default

I think 1 inch ISC tophats would work better unless you are sub 12 inch ride height.
wannafbody is offline   Reply With Quote
Old 10-05-2013, 11:34 AM   #3
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Aug 2009
Location: Chaparral, New Mexico
Posts: 101
Total Cats: 2
Default

I am about 12" front and rear as the car sits now. So would it be completely unbeneficial for me to use them? Maybe the 1.5" in rear and sell the 2"?

Or they wont help at all, and better off using the stock na hats for the time being?
SuperTuner12010 is offline   Reply With Quote
Old 10-05-2013, 01:55 PM   #4
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Aug 2009
Location: Chaparral, New Mexico
Posts: 101
Total Cats: 2
Default

I had also planned on getting new bumpstops from fatcat, but that hasn't happened yet. Really not wanting to spend $100 on 4 bumpstops.

Would I be ok just using the stock bumpstops for the time being?
SuperTuner12010 is offline   Reply With Quote
Old 10-05-2013, 05:00 PM   #5
Senior Member
iTrader: (1)
 
Join Date: Nov 2010
Posts: 951
Total Cats: -252
Default

I'd try the 1 inch in front and 1.5 inch in rear at your ride height. You do lose droop with those top hats so it would be a good idea to measure to see how much you end up with.
wannafbody is offline   Reply With Quote
Old 10-05-2013, 05:31 PM   #6
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Aug 2009
Location: Chaparral, New Mexico
Posts: 101
Total Cats: 2
Default

A do apologize for my lack of knowledge...

Installing the 1 1/2" top hat on the rear spring/shock I can push the spring down enough with my own weight to compress the spring to get the nut on the shock.

With the 2" I will need to compress the spring much more using a spring compressor. Would that be in issue? And at 2" is that considered to be a big decrease in droop?
SuperTuner12010 is offline   Reply With Quote
Old 10-05-2013, 05:50 PM   #7
Senior Member
iTrader: (1)
 
Join Date: Nov 2010
Posts: 951
Total Cats: -252
Default

2 inch top hats reduce droop by 2 inches. You should use the ISC top hats with adjustable sleeves to reduce preload. You can get 46mm bumpstops from Ground Control for $12 each plus shipping.
wannafbody is offline   Reply With Quote
Old 10-05-2013, 06:03 PM   #8
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Aug 2009
Location: Chaparral, New Mexico
Posts: 101
Total Cats: 2
Default

Thanks for the tip on bumstops, I will be sure do check them out. Much better price than fatcat...

I dont have adjustable perches at the moment, installing tein lowering springs on stock r package bilsteins.

Correct me if I am wrong, installing the 2" rear top hats will reduce droop by 2" understood. But the increase in preload will give a similar effect of stiffer springs no?
SuperTuner12010 is offline   Reply With Quote
Old 10-05-2013, 06:31 PM   #9
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Aug 2009
Location: Chaparral, New Mexico
Posts: 101
Total Cats: 2
Default

My shitty paint picture below...

I don't fully understand suspension terminology or completely how things work. But my understanding is.

In the middle you have a spring of 245mm, with a stock hat the spring compresses 15mm which is your preload. Now using a extended tophat, originally intended for lower cars that lost travel and want to regain.

In my case, I haven't lost very much travel at all with the lowering spring, but with the extended hat I am compressing the spring at a much greater rate, compressing it 45mm. So a much higher preload. My understanding is an increased preload would make the spring seem stiffer?
Attached Thumbnails
ISC top hats and billies.-spring.png  
SuperTuner12010 is offline   Reply With Quote
Old 10-05-2013, 07:31 PM   #10
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Aug 2009
Location: Chaparral, New Mexico
Posts: 101
Total Cats: 2
Default

This is what I have figured out

Specs for Tein S-Techs

Front/235 Rear/168

Now the rear spring length is 245mm, with the 2" tophat the spring is now 197mm.

How would I calculate the spring rate with the amount of preload? I am worried that with the 1.5" tophats on the front it may have a bad spring rate in relation to the rear.
SuperTuner12010 is offline   Reply With Quote
Old 10-05-2013, 08:59 PM   #11
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Aug 2009
Location: Chaparral, New Mexico
Posts: 101
Total Cats: 2
Default

Installed the 2" rear and the 1 1/2" up front, used a jack to lift up the lca with the tire on. Lifted until the car started to lift, car sits higher than it did before...
SuperTuner12010 is offline   Reply With Quote
Old 10-05-2013, 10:20 PM   #12
Senior Member
iTrader: (1)
 
Join Date: Nov 2010
Posts: 951
Total Cats: -252
Default

The taller the top hat I think you have more potential for coil bind.
wannafbody is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Raleigh: Fiberglass headlight scope, 1.6L ECU, AFM, Hardtop latches, more bigmackloud Miata parts for sale/trade 13 09-22-2017 01:34 PM
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
1991 special edition with hard top full part out JC, NJ russian Miata parts for sale/trade 6 10-08-2015 04:01 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 07:33 AM.