I picked a TVS1900

[Seriouslylotus]

As you all know, I have been slowly changing my 360 cup car to what I think it should have been from the factory

These changes include the following

Revalved, resprung dampers converted to 3 ways with adjusters that actually do something

Forged wheels, 60 ltr pro-alloy fuel tank, Cur R spec front splitter (carbon), Lithium battery and carbon carrier.(The car is now just above 1090kgs with the fuel light off)

My quest was to have a car that worked on track but could be used on the road, for me its mission accomplished....

Although the car is great, I have always felt that it should have been around the 400bhp mark. I have studied all the power upgrades in detail and discounted most for various reason,

Most reasons on the grounds of spinning the original supercharger faster to increase power, but I truly believe at the expense of intake temps. So the obvious answer was to charge cool the inlet, but for me that was against what Lotus are doing with the 'Light is right' program, so a TVS 1900 is what I have chosen.

The car was delivered to Hoffmans on Saturday for its annual service as it is almost a year since it was collected from Hethel, whilst there I asked them to sort the rocking seat and the squeaky roof. It seemed a long way to go for just a service so thought it would be rude not to use the long trip well !!!!!!

Before I took the car to Hofmanns, it was taken to the rolling road I have used for many years now (trusted numbers) After much trying and testing the best we could achieve was a mere 330 bhp at the crank, (measured not calculated) We tried it in all modes and in both two wheel and four wheel version, and although we could repeat the numbers the traction control was interfering in all modes at some point. One trick I have used in the past is to fool the traction control into fault mode........Bingo full power and totally repeatable

409NM Torque at 5002 rpm

351.7 bhp at 6914 rpm

Both pretty much spot on for a 360 spec car

I will be collecting the car from Hofmanns on Thursday, I have to say I cannot wait!!!

Will post the before and after dyno plots once the car has been back post upgrade

Half way through open heart surgery

Edited June 13, 2017 by Seriouslylotus

[Crouchy]

Nice one Dave. Can't wait to hear what you think of the upgrade.

[JayEmm]

Not trying to be too much of a dick here (and admittedly, failing), but how do you measure crank HP on a rolling road rather than calculating it?

[Seriouslylotus]

Measure the drag on over run.

Here is the charger on the bench having the inlet manifold changed

[JayEmm]

Is that reasonably accurate? I ask only because dynos seem to be a source of endless confusion, and I am keen to understand more.

Would also like to know about getting the traction control to get out of the way, when I had the 400 on a dyno it was giving me hassle too

[Seriouslylotus]

Hmmmmm bit bigger than the 1320 it replaces

[Seriouslylotus]

1 minute ago, JayEmm said:

Is that reasonably accurate? I ask only because dynos seem to be a source of endless confusion, and I am keen to understand more.

Would also like to know about getting the traction control to get out of the way, when I had the 400 on a dyno it was giving me hassle too

Poor guess or bad measure take your pick, But I always like to go with the measured approach especially if I can believe the numbers and the operator

The RR in question has no interest in who is doing the work or the upgrade etc etc, I merely used it as a pre upgrade bench mark... I have used this RR for years and it is always up to date on calibrations etc etc. I have no reason to doubt the numbers but and its a big BUT,

The numbers are just that,,,, numbers we could call them BHP and torque or bananas and apples.

The only thing I am really interested in is the shape of the torque curve and the percentage increase

Install finished, awaiting road test

[JayEmm]

Of course, in these scenarios you're looking at the *difference* not the actual numbers.

I'm very keen to know how you get on. Any expectations?

[KAS-118]

Sounds a great project - and although its something I wouldn't do I'm very interested to see what your results are 

 

[Trevsked]

Kevin, you not going to trim the bodywork around the pulley area? See it removed here on others and assumed although clearance now it will be different when the engine is under load and moving around on the mounts.

 

Trevor.

[550superfast]

The bodywork does not need trimming, it fits and does not rub or touch under load or at any other time.

Only the SSC charge cooled package requires a small section of bodywork to be cut and a cup r style engine cover to be fitted. 

PS - who is Kevin?

[Trevsked]

:-) sorry replied and read KAS-118's details. It's a pic of the chargecooler one I've seen then that requires a cutout.

 

Trevor.

[RedViper]

Very Interested to see the results on this also.

not sure who's video it was (presumably someone on here) but I was watching a 1900 Cup chasing the KT 460 at spa.. didn't look to be much in it at all.. obviously I have no knowledge of driver ability etc etc etc

[Seriouslylotus]

That was our very own Gary in the white cup and at one point I think win911

Both capable drivers!!

I picked the TVS1900 kit for reasons explained earlier, but also it changes so little on the car making it very easy to reverse back to STD with nothing cut drilled or modified. 

Keeping the inlet charge cool in the first place I think must be better than heating it up and then adding weight and complexity to cool it all down again

Time will tell if I am correct or not!!!!

[RedViper]

Ah very good. most enjoyable video

[Bibs]

15 hours ago, Seriouslylotus said:

One trick I have used in the past is to fool the traction control into fault mode.

How did you go about this Dave?

[Swiss380Cup]

So we're all waiting to see the outcome and get on the list of future addicts.... my 360 Cup is ready......

[Seriouslylotus]

Collected the car from Hofmanns with my trailer. Just done 20 miles round my test route..

Two letters to describe my car now

Hahahahahahahahahahahahahahaha

[Bibs]

[Gavin mckenzie]

Any more than ha ha ha to give us ??

[Seriouslylotus]

I have only driven the car about 20 miles so far, bit busy to do more.....

First impressions are as follows

Cold start and slow running/ Normal driving is no different to standard, however it is apparent there is much more torque available and the car will pull from about 1500 rpm in fourth gear with no problems.

The first time I gave it the beans in second gear, I thought the front wheels where going to become airborne!!! It really did push me hard into the seat and take off.

I will be taking it back to the rollers when I have chance, but that wont be for a few days, so the arse dyno will have to do for now and that is saying its a different car now and in a different league.

The engine revs very freely to the rev limiter, more so than before, the on road performance is very very impressive in both low rev high torque situations or in the High rev overtake situations. The easiest way to describe the performance is it now pulls in Fourth like it did pre upgrade in Third. So on the road you can use one gear higher everywhere compared to the standard car and get the same performance. Or use the same gear as before and take off

There is a small amount of supercharger whine now when pressing on but this nice not intrusive, It disappears when using lower revs or a smaller throttle opening, Its exactly the same with induction noise, There if you want it, with large throttle openings

So far I am very very happy.......Looking forward to the LOT day at Croft next Friday!!!

[Gavin mckenzie]

Thanks for feedback ???

[tim_marra]

Sounds great. Do you know if this set up will fit the Evora S?

[Seriouslylotus]

Pretty sure it does yes

Will ask SSC and report back

[tim_marra]

Thanks very much