The Lotus Cars Community banner
1 - 3 of 3 Posts

·
Registered
Joined
·
66 Posts
Do you have any data with the roof removed completely? (i presume this will be difficult though as the air flow and turbulance over the gap where the roof would be would make it hard to gather accurate readings) or even with the canvas roof from the elise fitted?
 

·
Registered
Joined
·
66 Posts
I know iv mentioned it before, but i just wondered if there was any plans to study airflow and intercooler temp/effeciency with the roof removed? Alot of owners are running the car like this, and there is alot of descussion, with no firm answer as to the effects/safety of this.

Any ideas?

Thanks
 

·
Registered
Joined
·
66 Posts
This is just based on my personal experience-------I have no data to support these conclusions.
I was driving my 240S around without the top,and while I was sitting at a light-ambient was about 85F-I could actually feel warm air-certainly warmer than ambient-coming out of my air intake. This was not a track day,and I was not driving it hard at all. Based on this,I have got to believe that the loss of HP is fairly severe without the top on. Again,I have no data to back this up. The wind buffeting(which I really don't care about) is much more pronounced in an Exige with the top off than it was with an Elise under the same conditions,which makes sense----and I am sure that the airflow to the wing is totally upset. If only someone made a scoop to use while the top is off,that might help. I can't imagine safety being a concern-do you mean in a rollover?
That said, on a beautiful summer or spring day,these things don't bother me-----For a track day,they would be a serious concern. This is on a totally stock 240S,I have Thomasio's intercooler but haven't installed it yet.
I still like the idea of a NACA duct on the drivers side sail panel,and the photo of the ducted air to the IC duct would also seem to be viable,but,of course,only when the car is in motion. I also noticed with the top off,when moving, the air coming over the windscreen is indeed warmer than ambient,but at the center of the windscreen(where the scoop would pick it up) it is actually cooler than the other spots!:wallbang::wallbang::wallbang::wallbang:
Sorry i dont mean safety if you were to roll over, but whether there could be damage to the intercooler/supercharger if poor airflow was apparent. I understand the roof scoop has no bearing on the engines cooling as a whole, but wasnt sure if the supercharger side of things could get damaged.

I think everyone agrees that if on track, or driving hard everyone keeps the roof on. But it would be nice to confirm for sure if driving topless on a sunny day will not cause any problems.
 
1 - 3 of 3 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top