[pranavt]

He quoted me the price for a set of new ones. Anyways, waiting for Viper to return, he has told me that he'll give me a call on Thursday, so hopefully I'll have finalised something by then.

[ananthkamath]

Originally Posted by ported_head

Isn't it difficult to determine vertical position of CG for the calculations?

you can measure cg height easily with a set of scales, or eyeball its position. but you wouldnt need that to tell you if the springs are too stiff or not, only for load transfer calculations which i expect no one here is interested in.

[ported_head]

Originally Posted by ananthkamath

you can measure cg height easily with a set of scales, or eyeball its position. but you wouldnt need that to tell you if the springs are too stiff or not, only for load transfer calculations which i expect no one here is interested in.

I agree.Load transfer and roll analysis out of those you mentioned. Scales and a small jack or hoist. How do you eyeball CG position?

[k_shanz]

Originally Posted by v1p3r

Are you sure? Race compounds are generally very soft in nature. And those are JK 13"s.

Ya, they are 13" jk`s but they are not soft, its very very hard. I hve been to many track days in Kari and MMSC and these kind of tyres i usually seen on Saloon cars prepared for track races.

[ssjr0498]

I have used those tyres on my Vtec. I just wanted to reconfirm.

Like V1p3r said, those tyres are very SOFT. They are also known as "tarmac tyres" or "track tyres" or "cut slicks".

Both JK and MRF manufacture them. IMO the MRF tyres are heavier and softer than the JK ones. But both have amazing grip levels.

Cheers
Shrey

Originally Posted by k_shanz

Ya, they are 13" jk`s but they are not soft, its very very hard. I hve been to many track days in Kari and MMSC and these kind of tyres i usually seen on Saloon cars prepared for track races.

[k_shanz]

Originally Posted by ssjr0498

I have used those tyres on my Vtec. I just wanted to reconfirm.

Like V1p3r said, those tyres are very SOFT. They are also known as "tarmac tyres" or "track tyres" or "cut slicks".

Both JK and MRF manufacture them. IMO the MRF tyres are heavier and softer than the JK ones. But both have amazing grip levels.

Cheers
Shrey

Thanks Buddy! I was mistaken, but i remember someone told me that they are hard compounds.

[pranavt]

The hardness is relative. Hard track tyres are still softer than reguar compounds.

[v1p3r]

Originally Posted by pranavt

He quoted me the price for a set of new ones. Anyways, waiting for Viper to return, he has told me that he'll give me a call on Thursday, so hopefully I'll have finalised something by then.

New ones will be between 2.5-4 lakhs landed, for a single set with 1 set of springs. To give you a rough estimate of price -- DMS 50 mm Adjustable Giant Coil Overs, , Subaru STi DMS 50 mm Adjustable Giant Coil Overs

Of course, these are marked up heavily. Also, I don't think DMS has ever made the casings for the OHC. Those were made locally, so if you're planning to get a set of new DMS for the OHC, I think you're pretty much SOL. Sorry. :(

You could just use D2s. There are a couple of tuned OHCs running them here, seem to be doing ok.

[ananthkamath]

Originally Posted by ported_head

I agree.Load transfer and roll analysis out of those you mentioned. Scales and a small jack or hoist. How do you eyeball CG position?

From experience. A reasonable estimate is sufficient for ballpark calculations of weight transfer. Not that I would like to do it that way, but any data is better than no data.

[pranavt]

Originally Posted by v1p3r

New ones will be between 2.5-4 lakhs landed, for a single set with 1 set of springs. To give you a rough estimate of price -- DMS 50 mm Adjustable Giant Coil Overs, , Subaru STi DMS 50 mm Adjustable Giant Coil Overs

Of course, these are marked up heavily. Also, I don't think DMS has ever made the casings for the OHC. Those were made locally, so if you're planning to get a set of new DMS for the OHC, I think you're pretty much SOL. Sorry. :(

You could just use D2s. There are a couple of tuned OHCs running them here, seem to be doing ok.

No no, that is beyond my budget. Any idea about D2 pricing?

[abhik]

Originally Posted by k_shanz

They are Race Tyres! Very hard compound,=one have to modify the suspension to fix those rubbers. MRF and JK manufacture it in India.

Bro i think you might be referring to hard compound "Rally Tyres" from MRF and JK because they do look like them, these ones are used for stages with more loose dirt(sandy) and less gravel if i am not wrong and wont really do well on tarmac.
"Race Tyres" are usually synonymous with road/tarmac racing and would be soft compound.

Originally Posted by ananthkamath

Streetability is affected for the simple reason that you have a bunch of tubes in the place where you need to get in and out of the car, and also in place of the back seat.

.
And i was wrecking my tiny brain on the technicalities when you said "streetability."
Look on the brighter side, you can skip gym and exercise all the time when you have to get in or out of your car.
"and also in place of the back seat" now why did you mention that separately?

But on a serious note, is that all that you meant with "streetability?"

Originally Posted by ananthkamath

Also, you cannot do any serious structural analysis with CAD. You need FEA for that.

The googled that up and its way too technical for my understanding, commerce background so you see. Plus i dont think i can get someone to carry out such an analysis.

Originally Posted by ananthkamath

I dont know what you want to calculate. Wheel rates? Ride frequencies? Load transfer distribution? Roll stiffness? What?

Have you tested the spring rate yet?

nope i havn't and frankly sont even know how to hence the question to you. We could probably start with discussing calculation for ride stiffness and spring ratings here and then move on as these are basics everyone would be interested in though roll, load etc are equally important too.

[k_shanz]

No i reffered track tyres, I thought they are hard compounds, rally tyres have got thick studs but track tyres dont have that!

[abhik]

The pattern ressembled so much like those Sand Grips from MRF and Dunlop that i was guessing they might be rally tyres instead of track ones. Sorry my bad! Its always the V-ish pattern which comes to mind when i think of track tyres.

[pranavt]

OEM shocks were stiffened and Eibach pro-kit lowering springs were chosen. Getting the stiffened shocks tomorrow and the springs on Thursday. Will post observations once it's all done.

[ankitahuja]

Originally Posted by pranavt

OEM shocks were stiffened and Eibach pro-kit lowering springs were chosen. Getting the stiffened shocks tomorrow and the springs on Thursday. Will post observations once it's all done.

Good choice Pranav. Do share the cost of stiffening the OE shocks. Also also tell us the exact method that was used to stiffen them, if you're aware of it.