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315s on an S4S - With pictures - Suspension/Brakes/Wheels/Hubs/Steering/Geo - The Lotus Forums #ForTheOwners Jump to content


315s on an S4S - With pictures


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Yep - they were very good to deal with.   In case anyone wants to look at doing this I used the 3.25 inch lips for the rear and the 2 inch for the front to keep the fronts stock size.

i initially did it as my lips looked terrible and thought may as well try the bigger rears...

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  • 5 months later...
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21 hours ago, silverfrost said:

Handles like its on rails i should imagine..... :thumbup:

Let's hope it's a lot better! Trains have poor braking performance, even worse acceleration and need a huge turning radius to be able to change direction... 😛

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I have made many mistakes in my life. Buying a multiple Lotus is not one of them.

 

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3 minutes ago, CHANGES said:

It should have improved grip at the rear because of the larger contact patch..  But don't get drawn into bigger is always better by just fitting it..  There may be some GEO changes that are needed to compensate for resulting differences in rear scrub angles.. Lotus when they fitted any tyre, ( dia , width , profile , compound, pressure, manufacturer. )  to a particular model would have factored in all the dynamics to ensure the best handling characteristics possible..  Changing any one of these will move out of original spec.. 

  Interestingly just about everyone will have moved away from the original manufactured tyre fitted by Lotus due to availability, so some allowances have to be made..   I still believe the best starting point for any Esprit is the factory spec. for model tyre size etc.  This should always be the default setting..   When you move off spec with wheel / tyre size, offset etc etc , then expect little differences ..  Unless you are connected with your Esprit's handling like motor sport drivers are , then you will not appreciate the subtle differences which happen , and probably wont drive the Esprit aggressive enough to have any real effect..    But you should still be aware.!!!

A lot of us can really feel when the tyre pressures are wrong on our Esprit, and i am not talking by a lot , just 3 or 4 lbs can be felt. This in main is due to the fact the lower pressure changes the contact patch and how it reacts in corners , in turn this also effects the slip and scrub angles. These influence the handling of the Esprit which is what you are feeling..  

So in brief , be aware when you change one dimension you can influence another...    This does not mean you can not benefit from changes, just that you may need to tweak a few other things to get the best from them..    For the best advice regarding wheel /tyre changes , go to a motor sport shop that sets up race cars.  They will have a much better comprehension on what is needed for the changes you have made to get the best from them..  

I am a big supporter of Changes , and @pureguava wheel/ tyre set up looks much improved .  But we should always remember other factors may need consideration when going off spec..             

Couldn't agree more - great post! - these will subtlety change the geometry but I have to be honest - It might make me a massive poser but I fell in love with  the esprit for its looks - the handling / performance is a massive plus.  

I can't kid myself that I can ever get enough out of this car to justify its performance- I just don't do enough track work.I also think this car shouldn't be abused to the point that I will notice the difference that 315s vs 285s make - I have other later vehicles that can fulfill that duty. 

The big problem I had in every day driving was rear wheel spin - the 315s help with that so maybe just what I am looking for. 

The front 3/4 view lets you appreciate the stance with these wheels and I am surprised I don't have pictures from that angle - I will address soon!!

 

 

21 hours ago, silverfrost said:

Handles like its on rails i should imagine..... :thumbup:

Yep ..... Can you believe they got this much power out of just a 4 cylinder!?!

5 minutes ago, Escape said:

Let's hope it's a lot better! Trains have poor braking performance, even worse acceleration and need a huge turning radius to be able to change direction... 😛

https://youtu.be/I7IEfGTyT3Y

He said rails ..... nothing about a train!

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4 hours ago, pureguava said:

https://youtu.be/I7IEfGTyT3Y

He said rails ..... nothing about a train!

That is impressive, but not really about handling.

My remark was tongue in cheek of course, been going through train statistics for most of the day... And I hate the bloody things! Fortunately I can slip onto TLF from time to time, to sooth my mind with lovely pictures like the ones above. 🙂

Filip 

I have made many mistakes in my life. Buying a multiple Lotus is not one of them.

 

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5 hours ago, Escape said:

That is impressive, but not really about handling.

My remark was tongue in cheek of course, been going through train statistics for most of the day... And I hate the bloody things! Fortunately I can slip onto TLF from time to time, to sooth my mind with lovely pictures like the ones above. 🙂

Filip 

I know exactly what you meant -  and I loved the post - I was just trying to find one thing on rails with out train like performance 

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  • 1 month later...

Nope, no problems at all. I just sprayed them a bit, then let it stay for a day, sprayed again and then they all came off like new. I did resurface all of the original nuts (well, a company did that). And I cleaned and hand polished all the bolts before reassembly. They have to be dead clean before tightening them down. So, no problems. But there are indeed many on a full set of wheels... ;)

Kind regards,

jacques

Nobody does it better - than Lotus ;)

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Yes, I did. You have to do that. Blue medium Loctite. Not a line, only a drop.

The process is to insert 4 bolts and lightly tighten the nuts. Then you go to a tyre fitter and have it centralised 100 %. Or do that yourself.

Then mark those 4 bolts, now tightened a bit more. with a sharpie. Then insert all of the others in a multi criss-cross patern with loctite and tighten over 3 sequences.

Lastly do the other remaining 4 from the beginning.

That way, it's done correctly and is radial and centralised. Important.

After that, you can lay two beads, cure, then a third bead in the middle. It sounds like a lot, but it is not that much. Just to make sure it doesn't leak. And I used air bubble free, acid free, heat, cold and water resistant stuff.

I did not use any sealant between the middle "star" and the inner and outer rings, to avoid any hill/valey patern. and I made very sure that all mating sufaces were really clean, with no traces of old sealant/corrosion/dirt etc.

Kind regards,

Jacques

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Nobody does it better - than Lotus ;)

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Thanks, so the idea is to tighten four bolts fully at a time. I wonder if a dry thread lock wouldn't be even better as it would allow(?) torquing the bolts more evenly ... (never used a dry one so I am not sure of the "curing" time since it's already dry %))

Indeed I have already read that one must not put any sealant between the rims and the disc to ensure it seats properly.

Thank you for the details!

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Well, the idea is to only work loosely on just 4 bolts untill you have it all centralised. Then work as described in a criss-cross patern, over 3 tightening specs. Then install the valve and it's cap. Then you go to check it all again by measuring it up and rotate it on a good wheel balancer which can also measure the pressure that the wheel gives on to the "road". It varies all over the circumference. Then you can lay the beads, and then you meadure it all up again, and the you can install and rotate the tyre to suit. Working with the road pressure will bring the weights down to a minimum and give you less tyre wear and more precision. When first assembling the central "star", the inner barrel and the outer lip, remember to align the small marked numbers on each part "1", for all parts of one wheel. "2" for the second and so on. It also relates to the valve hole in the wheel/position of the valve.

Kind regards,

jacques

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Nobody does it better - than Lotus ;)

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