Respectable trackday lap time for Silverstone GP Arena.

[drakart]

BertBert said:

Data point from Sunday...2:39, 1963 Lotus Elan on new M section Dunlops

You know the rules... you can never say you were on new tyres!

[ecain63]

drakart said:

BertBert said:

Data point from Sunday...2:39, 1963 Lotus Elan on new M section Dunlops

You know the rules... you can never say you were on new tyres!

Ha! Truer words..... etc

[honda_exige]

Another data point to chuck at this actually quite interesting thread.

Got a 2:26.9 last week, car info:

2003 Lotus Elise 111s with Exige body work.
K20 Honda running around 230bhp.
Fully road legal (14k miles all over Europe in 2 yrs.)
Nankang AR1s, 60 lap old rears & 400 lap old fronts.
No Aero.

Timing via 10Hz GPS.

Next I'm experimenting with a big chassis mounted rear wing, curious to see if it makes a difference as I feel like the main limitation is the rear not sticking on turn in.

Almost stacked it at Copse too

[Dynion Araf Uchaf]

honda_exige said:

Another data point to chuck at this actually quite interesting thread.

Got a 2:26.9 last week, car info:

2003 Lotus Elise 111s with Exige body work.
K20 Honda running around 230bhp.
Fully road legal (14k miles all over Europe in 2 yrs.)
Nankang AR1s, 60 lap old rears & 400 lap old fronts.
No Aero.

Timing via 10Hz GPS.

Next I'm experimenting with a big chassis mounted rear wing, curious to see if it makes a difference as I feel like the main limitation is the rear not sticking on turn in.

Almost stacked it at Copse too

The rear not sticking on turn in is because you are off the throttle for too long as you turn in. For Copse you brake only for as long as it takes to change gear, turn in on the throttle and power all the way through. Conservatively I’d say theres 3s of lap time you are giving up on that lap by not commiting harder to the fast corners and getting on the power early

[honda_exige]

Dynion Araf Uchaf said:

The rear not sticking on turn in is because you are off the throttle for too long as you turn in. For Copse you brake only for as long as it takes to change gear, turn in on the throttle and power all the way through. Conservatively I’d say theres 3s of lap time you are giving up on that lap by not commiting harder to the fast corners and getting on the power early

I've found that turning in on the throttle at Copse leads to the front washing out on these cars. Switched to trail braking and found a couple of seconds a Lap but I'm fully prepared to experiment again if that's where the time is. Although watching the quickest race S2 Exige video I've found at Silverstone he seems to pick up the throttle at a similar point

I'd be delighted with a high 2:23 as that's within a couple of seconds of the Exige V6 Cup race cars with aero, Sequential gearboxes and 400 odd bhp.

[Nickjd]

Here is a 2:30 in a 180bhp per tonne Mazda. https://www.facebook.com/johnmunroracing/videos/55...

[honda_exige]

Dynion Araf Uchaf said:

The rear not sticking on turn in is because you are off the throttle for too long as you turn in. For Copse you brake only for as long as it takes to change gear, turn in on the throttle and power all the way through. Conservatively I’d say theres 3s of lap time you are giving up on that lap by not commiting harder to the fast corners and getting on the power early

Went back on Monday and got a 2:25.7, optimal was a 2:24.9 which is 2 sec faster than previous.

The final second you mentioned I think would come from carrying more speed through Copse and Stowe, need to be braver through the both of them.

Lotus Elige, 230bhp and well used (of course) Nankang AR1s.

Interesting addendum, my car is faster on almost every corner than this Exige V6 Cup R race car driven by Pro racer Ben Clucas, which shows the advantage of the lighter and shorter wheelbase of the S2 Platform. The biggest mistake Lotus made was not giving it the Power it deserved imo.

https://youtu.be/ocpf7B6-Q_U

Edited by honda_exige on Thursday 24th March 10:51

[drakart]

2.24 in a 987 Cayman S (320bhp 1310kg) on stock width AO52s. It was busy, so vbox said a 2.23 ideal lap. Its a pdk and I was short shifting to an extent - next time i'll just leave it in auto as the data says it is faster. I'm not sure there's much more left in it at that.

Edited by drakart on Wednesday 20th April 15:34

[ecain63]

A low 2.28 round the GP in my Exige. Still loads to chip off.

Just so I'm keeping with tradition, my tyres are old as hell. Fronts are 16k old and are the ones the car came from factory with lol. Rears are a few trackdays old now.

[dontdobends]

drakart said:

2.24 in a 987 Cayman S (320bhp 1310kg) on stock width AO52s. It was busy, so vbox said a 2.23 ideal lap. Its a pdk and I was short shifting to an extent - next time i'll just leave it in auto as the data says it is faster. I'm not sure there's much more left in it at that.

Edited by drakart on Wednesday 20th April 15:34

That's a decent time! quicker than a lot of GT4s

[RacerMike]

Jonny broke the production car lap record the other day in his GT2 RS MR and JCR geo/damper settings/sport cat exhaust.

Time was 2:06.83 and video below.



Mad how capable they are and how good the Cup2 R is. 1.5G on a road legal tyre is insane.

[LaSource]

2:15 in a KTM XBow last month on sticky tyres. Ok, it is not a conventional road car, but it is road legal and I use it for pottering around on weekends

Was learning to lean on the aero with each lap (ie the faster you go, the greater the grip - which is counter intuitive to us amateurs!)
My ideal was 2:14 and even on this lap you can see I was behind at the start, more behind due to traffic half way, and then made up a faster time through maggots/becketts.

Was hopeing to do a proper 2:14 but then it started raining. Will save for next time.

[PGNSagaris]

Rapid!

[dhdev]

LaSource said:

2:15 in a KTM XBow last month on sticky tyres. Ok, it is not a conventional road car, but it is road legal and I use it for pottering around on weekends

Was learning to lean on the aero with each lap (ie the faster you go, the greater the grip - which is counter intuitive to us amateurs!)
My ideal was 2:14 and even on this lap you can see I was behind at the start, more behind due to traffic half way, and then made up a faster time through maggots/becketts.

Was hopeing to do a proper 2:14 but then it started raining. Will save for next time.

Nice lap! Good speed through a lot of the corners, with Copse being the only really noticeable one where I think you could keep a lot higher apex speed. In general you were on a par or better than a GT4 race car for apex speed, but Copse you were about 7mph down.

[LaSource]

PGNSagaris said:

Rapid!

I kind of surprised myself too

dhdev said:

Nice lap! Good speed through a lot of the corners, with Copse being the only really noticeable one where I think you could keep a lot higher apex speed. In general you were on a par or better than a GT4 race car for apex speed, but Copse you were about 7mph down.

Thanks. That is good and useful insight.

Yes I wanted to work on Copse. I had started to realise that at Abbey I could just lift and turn without braking, take maggots almost flat, etc and wanted to extend some of that towards Copse too (may be still a dab on the brakes or maybe an earlier lift and turn to scrub a bit of speed / load up the front). However with Copse being blind (more the exit than the apex!) you can't help but hit the brakes on the way in...and then on the way out keep thinking 'I could have gone faster throught there!'

Tried again this Monday but the weather was not kind and on the short dry time I had there did not feel in the zone to push that much.

I also was not using the longer front splitter but a shorter road friendly one...dunno if placebo or real, but felt front end was pushing more which also took away some of my bravado to go quicker through the faster corners.

[honda_exige]

LaSource said:

PGNSagaris said:

Rapid!

I kind of surprised myself too

dhdev said:

Nice lap! Good speed through a lot of the corners, with Copse being the only really noticeable one where I think you could keep a lot higher apex speed. In general you were on a par or better than a GT4 race car for apex speed, but Copse you were about 7mph down.

Thanks. That is good and useful insight.

Yes I wanted to work on Copse. I had started to realise that at Abbey I could just lift and turn without braking, take maggots almost flat, etc and wanted to extend some of that towards Copse too (may be still a dab on the brakes or maybe an earlier lift and turn to scrub a bit of speed / load up the front). However with Copse being blind (more the exit than the apex!) you can't help but hit the brakes on the way in...and then on the way out keep thinking 'I could have gone faster throught there!'

Tried again this Monday but the weather was not kind and on the short dry time I had there did not feel in the zone to push that much.

I also was not using the longer front splitter but a shorter road friendly one...dunno if placebo or real, but felt front end was pushing more which also took away some of my bravado to go quicker through the faster corners.

Great time, yeah Copse is the only corner where my apex speed is a little higher than yours, rest of the track you're a good 5-10mph up. Copse is one scary mo-fo, only place I've ever properly lost the car in 4 yrs of ownership and was lucky to not end up in the barriers.

[dhdev]

I've never found Copse particularly intimidating, granted it's a bit unsighted, but there is plenty of tarmac run-off if you need to open out the steering or collect a slide. Maggots is flat in mine, but Copse still requires a dab of brake to bring it down from 120mph for an apex speed of 103mph. It's mind blowing that the F1 cars in quali are 180+mph

[honda_exige]

First time at a dry Silverstone for me in the new(ish) to me 718GT4.

Very very impressed with it - did a 2:22.1 on my only clear lap all day throwing away 0.5sec+ with a stupid slide - tyre pressures still not fully dialled in.

First half lap of the video near end of the day was on for 2:20.X before getting C1'd, got the tyre pressures right and was starting to adapt more to the car, can see it's higher energy than the full lap.

Very happy with the N1 Cup2s - this was their 5th trackday and very even wear so far and still giving decent grip, corner speeds not massively off my Lotus on AR1s.

Car would benefit from being a touch stiffer, dives and rolls a bit more than ideal imo. More time to find as is though being a bit braver at Copse and entry to maggots/becketts, took it a bit easy there as it snapped on me earlier.

Using the JCR 981GT4 lap as a guide was helpful, going by the sport Chrono clock running in that video that's more of a 2:23 lap as the video itself is running fast compared to that, deeply impressive time nonetheless in the prev gen car 2 up.

Edited by honda_exige on Thursday 28th March 13:58

[Olivera]

honda_exige said:

First time at a dry Silverstone for me in the new(ish) to me 718GT4.

Lovely! Fast despite the intergalactic gearing, it's still pulling in 4th when some cars would be topping out in 6th!