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Old 06-28-2010, 05:52 PM   #1
HardInThePaint
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Extended tophats

OK I seen some cats with these and I kinda understand the concept but not fully. What exactly is the science behind extending the tophat? Please explain...
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Old 06-28-2010, 06:13 PM   #2
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More piston travel for the shock
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Old 06-28-2010, 06:17 PM   #3
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Hmmm, thats what I figured but I thought maybe it was more to it than that. Right on.
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Old 06-28-2010, 06:20 PM   #4
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There probably is... that's all I remember from having it explained to me.
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Old 06-28-2010, 06:23 PM   #5
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it's like wearing a tophat instead of a baseball cap. it gives more room for your hair to grow.
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Old 06-28-2010, 06:49 PM   #6
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correct me if I am wrong...far as I can tell, it is for people who do not have a full suspension. They have lowered springs coupled with shocks not meant for that setup. Always seems like mismatched/improperly set up pieces.

From what I have only observed...it seems to be needed because the shocks being used with some set of springs are not designed for each other so the top hats must be extended so that the shocks do not get blown prematurely and so they have full travel.

i honestly do not understand why people do this. To me, it is like cutting a bolt that is too long instead of getting the right sized one.

But that is based on just observation and asking casual questions...I am sure there are some instances on some cars I suppose where you do not have suspension parts available so you would have to improvise...such is not the case with our cb's...again...correct me if I am off base.
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Old 06-28-2010, 08:09 PM   #7
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they use it on koni yelloe and gc setups all the time.
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Old 06-29-2010, 10:39 AM   #8
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Quote:
Originally Posted by wed3k View Post
they use it on koni yelloe and gc setups all the time.
Yeah I've noticed that GC sells extended tophats, mostly for Civics and whatnot tho.
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Old 06-29-2010, 11:17 AM   #9
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Generally, assuming a soft set up, doesn't your shock absorber run out of travel before your spring does? So if you have the wheel well clearance for a lot of tire travel and you want to run a comfortable (reads: lots of travel) spring and shock set up, the bump-stop on the shock absorber is going to ruin your fun. Raise the top hat a bit to retain the bump stop and gain a little bit more travel and comfort.

I suppose with slammed cars, they would have the issue of having very little shock absorber travel. I would think extended top hats would definitely help for driveability in that case.
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Old 07-01-2010, 11:28 PM   #10
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Quote:
Originally Posted by wed3k View Post
they use it on koni yelloe and gc setups all the time.
why?
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Old 07-01-2010, 11:56 PM   #11
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here's a diy style a guy around here did on a 3rd gen.


later.
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Old 07-02-2010, 12:09 AM   #12
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Quote:
Originally Posted by bcjammerx View Post
why?
why else?
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Old 07-02-2010, 02:26 AM   #13
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Originally Posted by bcjammerx View Post
why?
less strain on the shock?

think about it. think like......your spine being compressed all day by an african water barell carrier thing. then taking the weight off and letting your back straighten out.

thats how i see it. your shock will be happier and last longer if it looks like
this. |=========+
not. |====+ this.
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Old 07-04-2010, 01:16 AM   #14
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I am not trying to be a jackass I swear...

With ground controls and koni yellows I am guessing the ground controls are not designed to ride lower that is my reason for asking why because neuspeed shocks with koni yellows do not require extended top hats, do gc's have longer pistons or something?

If the shocks are designed for those springs or ones similar why would you NEED them? If the shocks you buy are designed to operate with the springs you buy then you should not need extended top hats.

So again, and I am not trying to be an ass, why would you need top hats when your suspension is not mismatched or slammed?
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Old 07-04-2010, 10:29 AM   #15
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because in order to achieve the desired ride height and most race car setups are super low because they dont have to worry about bumps and road conditions they have to spin the collars way down.

this setup is about 1300 while a true race coilovers are over 2g's. konis are rebuilt by a lot more places as well. so if you find someone throwing away koni yellows for free, take them because they can be rebuilt be end up being cheaper than buying new. (except now koni yellows are like 125 at tirerack)

Neuspeed springs are a lot longer, eibach or QA1 springs can be little shorty's like 7" so you can run super low but you run out of piston travel.
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Old 07-04-2010, 03:06 PM   #16
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ok, I understand a little more now.
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Old 07-05-2010, 02:39 PM   #17
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they are still very useful on full coils. i have astros omnis with front extended tophats. let you go even lower than normal without sacrificing much, if any shock travel.

the omnis will go lower than the chassis will allow because of the UCA's and still have enough shock travel to legitimately have a decent ride without blowing the shocks.
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Old 07-05-2010, 02:58 PM   #18
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Most decent coilovers provide ride height adjustment by extending or contracting the shock body. If you do this, you don't compromise piston stroke / travel. Ground Control is an excellent example of a decent/high quality coilover sleeve. With a sleeve or lowering spring you have ride height adjustability @ the expense of shock travel. That is why an extended hat is needed.
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Old 09-15-2010, 04:29 AM   #19
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how can i make my own? or that pic posted above what do i need to make one like that?
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Old 09-15-2010, 04:59 AM   #20
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Quote:
Originally Posted by Flatline View Post
they are still very useful on full coils. i have astros omnis with front extended tophats. let you go even lower than normal without sacrificing much, if any shock travel.

the omnis will go lower than the chassis will allow because of the UCA's and still have enough shock travel to legitimately have a decent ride without blowing the shocks.

Truth. The extended tops that I had made allowed the whole shock to travel past the OEM upper mount location... So even on the floor, the car still rode hald assed good .... then the floorpans stayed off the pavment.

If I had used an OEM top and bumpstop WITH NO SPRING AT ALL ... the car acaually would have sat higher then it did with with the OMNI's and extended tops.
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