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-   -   v6 cup update (https://www.lotustalk.com/forums/f157/v6-cup-update-470688/)

boxerman 07-11-2019 04:49 AM

v6 cup update
 
Each year we chip away at the car, unlocking its potential. A big shout out to Allen Strommer and vsa motorsports. Allen knows these cars, knows what he is doing and the work quality is first rate. he has guided me from day 1 with the car, and very change has yeilded great results.

2 summers ago we did the ohlins shocks and motorsport rotors, Allen built up the shocks to the lotus specs but not the Lotus price. The shock and spring change was profound in terms of handlign and stability, it went from a street car that could work on track to a real track car.

This winter I sent the car to las vegas to have Allen do what was really necessary. Specificaly in stock form after 5 laps there was significant power fade on the order of 30 hp with crappy throttle response to boot, due to heat soak, who knows the lotus computer is very limited. My global internet search indicates thats what these cars suffer from stock. When you actualy look at what the lotus computer can and cannot do, its pretty limited with lots of extrapolation from few sensors.

Mechanical upgrades were the Boe headers, iconel heat sheilds, cold air intake, solid motor mounts. However the biggest change was going to a motec computer. The car gained almost 40 ftlbs, 25hp, and this is power that does not fade. Also and perhaps more importantly the power curve from 3k rpm to 7200 is all there, no dips plateus etc, peak tq is there from 3500 to close on redline. The throttle is beautifully linear too.

The Motec also provides real traction control, ie a multi stage switch whereby if rear traction is being lost it first pulls some timing so you still have power growth but its being managed, as opposed to systems that just cut ignition of fuel which impedes progress.

To contextualise, without even trying, and second time out this year I was 3.5 secs per lap faster at MMc. Since it was second time out my driving was imo sloppy compared to how I was driving at the end of last year, also the new laptime is sustainable till the fuel runs out because there is no discerable power fade. Lastly with the better and more linear power balance avaialable the tire wear rate has gone down significantly especialy at the rear.

I woudl say once driving to the level of last year this car is 5 secs per lap fasterm thats before we start with using the immense amount of data now available to improve the driver.
The amount of engine data we can pull from the motec in terms of car performance is amazing, and timimg is set conservatively enough were not seeing the knock sensor activate at all.

Then there is all the driver data to get from the motec and aim system, ie theres much much to learn, and a ways to go in terms of speed.

I woudl say if youre runing your V6 car on track, or dont need cats, this is a great setup, without needing to swap superchargers or fitting intercoolers. Plus with the motec any other changes in the future like bigger blowers etc are easy to dial in.

Once again, Allen and VSA are the way to go for getting a v6 car up to potential, he knows what really works and what does not. Plus you get fantastic product support and backup.

Jack 07-18-2019 07:05 AM

1 Attachment(s)
Nice write-up Sean.

Glad you are enjoying the V6 again.

Allen @VSA does great work and keeps my baby on track. :grin2:

boxerman 07-18-2019 04:53 PM

I just got back from 2 days at the glen. The only quicker car there was a 991 GT3 Cup car. I'd like to say its because I am good driver, but realisticaly the exige is just that fast now. For example there was a a hard charging 997 gt3 cup car and the exige was clearly faster everywhere. Not bad for a turnkey track car.

The motec is the biz, the way it controlls traction, my cofidence in the car has grown exponentialy ad that of course leads to more speed.

Frankly after being at the Glen I can say the car turned out better than I expected.

oldmansan 07-18-2019 06:06 PM

I sure wish VSA were still here. No idea what I'm going to do when I need some work done.

San

Jack 07-19-2019 09:42 AM

Quote:

Originally Posted by boxerman (Post 5964986)
I just got back from 2 days at the glen. The only quicker car there was a 991 GT3 Cup car. I'd like to say its because I am good driver, but realisticaly the exige is just that fast now. For example there was a a hard charging 997 gt3 cup car and the exige was clearly faster everywhere. Not bad for a turnkey track car.

The motec is the biz, the way it controlls traction, my cofidence in the car has grown exponentialy ad that of course leads to more speed.

Frankly after being at the Glen I can say the car turned out better than I expected.

Fantastic, great to hear!

Of course, I must add...GT3's whether the new RS or Cups have never been an issue relating to lap times when compared to my V6 Exige or even the 2-11, but that, IMHO, was "driver and tire-dependent". In my experience, the vast majority of owners of GT4s (street or full competition/race models) or GT3s that hit the track are just not fast "tracksters" and/or they will be running some version of an R-comp street tire.

As for straight line speed----sorry, a Porsche GT3RS or Cup is FASTER, even if the V6 had an additional 100 BHP. ;)

Check out this video of me in the 2-11 coming up on a GT3RS ....at first I thought it was the owner driving so I expected a point-by pass to be easy 'pickins' but then I hung back because the car looked like it was pushing extremely hard and I did not want to get too close in case he spun. Then, I realized it was the driver-coach (a very experienced and excellent race car driver and one of the best instructors at SM) driving--green light for me to push harder. The video tells the story and tires made the difference. Me on slicks, the P-car on Michelin PS Cup 2 R tires


boxerman 07-22-2019 06:13 AM

Quote:

Originally Posted by Jack (Post 5965178)
Fantastic, great to hear!

Of course, I must add...GT3's whether the new RS or Cups have never been an issue relating to lap times when compared to my V6 Exige or even the 2-11, but that, IMHO, was "driver and tire-dependent". In my experience, the vast majority of owners of GT4s (street or full competition/race models) or GT3s that hit the track are just not fast "tracksters" and/or they will be running some version of an R-comp street tire.

As for straight line speed----sorry, a Porsche GT3RS or Cup is FASTER, even if the V6 had an additional 100 BHP. ;)

Check out this video of me in the 2-11 coming up on a GT3RS ....at first I thought it was the owner driving so I expected a point-by pass to be easy 'pickins' but then I hung back because the car looked like it was pushing extremely hard and I did not want to get too close in case he spun. Then, I realized it was the driver-coach (a very experienced and excellent race car driver and one of the best instructors at SM) driving--green light for me to push harder. The video tells the story and tires made the difference. Me on slicks, the P-car on Michelin PS Cup 2 R tires

https://www.youtube.com/watch?v=Qs_IqvQGlX0

The 997 GT3 cup and the 991 Gt3 Cup were lowered cambered cars, no interior(cup cars) running micheln soft compound slicks. A Gt3 Rs is a road car, these were cup cars. The 997 was down to driver, the guy in the 991 knew what he was doing and that car was fast everywhere as it shoud be. Neither one of thsoe were turn key cars, the 997 had a dedicated tech there to help it run and the 991 was the same.

Ill compare than to my car, which has hankook medium compound slicks and I was 6 heat cycles in before the first day. Even still there is no way the exige would catch the 991 Gt3 cup car. They weight 2800lbs or less and have 500+hp, a wide powerband, lots of aero, paddles, 2x gripper tires etc.

Compared to a new GT3 road car, the exige smokes it pretty much everywhere, maybe slightly slower at the end of a long straight, but even then Im not sure. The Glen is also a big and hp track.

All in all Im really impressed with the exige, it came out way better than I expected, and thats rare with any car mod.

Jack 07-22-2019 07:14 AM

^^^^ I agree. GT3 road cars are no match for either of my Loti in terms of lap times.

GT3 Cup race car driven by a good driver will smoke the Loti -- even the Evora GT4 full on dedicated race car can't match the P-Cup lap times. ;)

eldonz 07-22-2019 07:30 AM

Quote:

Originally Posted by Jack (Post 5965836)
^^^^ I agree. GT3 road cars are no match for either of my Loti in terms of lap times.

GT3 Cup race car driven by a good driver will smoke the Loti -- even the Evora GT4 full on dedicated race car can't match the P-Cup lap times. ;)

Jack,

You should know that the plural for "Lotus" is "Lotus" as published by the official Lotus Factory letter. :wink2:

Later,
Eldon

Jack 07-23-2019 06:33 AM

Quote:

Originally Posted by eldonz (Post 5965840)
Jack,

You should know that the plural for "Lotus" is "Lotus" as published by the official Lotus Factory letter. :wink2:

Later,
Eldon

Thanks Eldon.... but for me, plural of Lotus will remain Loti, pronounced /'low,tie/ . >:)

boxerman 09-09-2019 11:16 AM

Found some more speed. The steering wheel angle sensor sends an input to the motec to dail back timing based on speed and steerign angle.
I found I could sue more drive out of corner so we have been lossening the dialback tot he point where yaw occurs at various corners and speeds. Gained another consistent 1 sec per lap. Theres probably more to go though.


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