S1 Exige With Built K20a2 Rotrex Blower Etc.

[bcee]

Drool. That is going to be one fantastic set up. Enjoy!

[Composites]

Would you share the scoop on those cool motor mounts?

[Composites]

I'd be happy to share all of it with you. Tell me what tracks you'll be driving at the most and I'll share applicable setup data on suspension, ride height and wing angles. The rest is just simple trickery and racecraft to make the car reliable even when behaving mercilessly, and I'm happy to share that too.

We've got a lot of shock data on the car as well, (shim stack recipes, applicable spring rates, etc.)

One thing I can think of off the top of my head is the front mounted oil cooler. Upon closer observation you'll see that there's not a whole lot of opportunity for air to exchange heat in its current configuration and in our case, the oil always got hot.

I'd recommend a water-oil cooler mounted in the engine bay. (NASCAR technology yes, but good technology regardless. For the moment, just ignore the mullet draped over this innovation and appreciate it for what it is).

The water lines can be plumbed in as the send and return of your heater, (assuming you won't need such creature comforts as a heater). Engine cooling will be much more efficient and you'll eliminate some 30 feet of unsafe rubber oil lines running from the engine bay to the nose of the car. A significant chunk of weight to lose in the game of chasing grams! You'll also be able to remove the heater core for additional weight savings.

The subsequent holes left behind from the removal of the oil cooler can be sealed off, (we used a carbon fiber sheet, naturally) Sealing this off has the extra advantage of improving the air flow to the radiator, which you're gonna need pushing 400hp!

Hey, thanks for the scoop on the motor mounts. It's nice to have a back-up plan, the mounts we purchased were always a bit suspect. I like your setup much better.

[jamie]

Interesting seeing another take on the layout for a SC/IC set-up two questions for you though - are you not worried about the relative weight above the engine (it must raise the centre of gravity) also having the oil & IC radiator feeding from the roof scoop are you sure firstly you will get a decent enough airflow and secondly how about heat sink from the engine?

Most of the solutions I have seen are either IC radiator up front twined with the main radiator or in a side scoop.

[jamie]

Thanks for the response, does look very neat.

Here's an even bigger rotrex is a S1 Exige
LOTRDC Elise Trophy. Silverstone 2007 Photo Gallery/LOT-HDR-JQ3Q0168-01

[jamie]

Last year's race car...
An S1 with N/A Honda weight was about 725kgs - great car light and with 225hp was so much fun!


LOTRDC Elise Trophy. Silverstone 2007 Photo Gallery/LOT-HDR-JQ3Q0417-01

This might be of interest

An Audi 1.8 built with a turbo and IC - currently getting a bigger turbo but did produce 500hp on a smaller turbo!


This is not actually my car but is very similar to my current car a S2 Elise which used to be powered by a K serise but then had the K20a and a SC. With the IC it produces 350hp on 9psi on standard internals.

The IC is under the SC like this
SELOC Forums

[jamie]

Originally Posted by ggelise

Jamie-

This guy must be pumping out some huge numbers.

It went on the rollers and was hitting 400+ but they stopped there as the limit in the race series is 320!

Here is a vid of a Exige on the rollers with the IC & SC
Vid from a SC, intercooled Honda Exige on the dyno

[mevistox5]

Is it Chris Randall's car?

[jamie]

No, the one on the dyno is in Oz and was the original test car for the Link-up IC system.

[jamie]

I am not racing the S2, just my road/track car. The LOTRDC is slowly moving away from modified Elises towards Lotus products like the 2-11 & 260 Cup etc (I think its a real shame) The S1 with n/a K20a was possibly the best combo I have ever driven although the SCed Honda is silly fast !
The engine is amazing

[dmh]

Originally Posted by jamie

I am not racing the S2, just my road/track car. The LOTRDC is slowly moving away from modified Elises towards Lotus products like the 2-11 & 260 Cup etc (I think its a real shame) The S1 with n/a K20a was possibly the best combo I have ever driven although the SCed Honda is silly fast !
The engine is amazing

Concerning LOTEDC racing, keeping the rules tight and racing the cars that come from the factory are exactly what makes a series grow. Just look at PCA Club Racing in America: the Cup car class is by far the largest class -- by far.
I just wish that the powers that be in the western US based LCS come to understand this. For if they don't what they will end up with is heavily modified DE cars and uncompetitive classes. And if you don't think so just look to BMW CR's Prepared classes!
I guess if you want an unlimited class then fine but what is the point of racing in a one marque series if you are racing somebody in different machinery?
Good for LOTEDC.

[blairellis]

Not sure if I ever subscribed to this. Do you have some detailed pictures of the intercooler supports? I'll probably need to do something like that with my setup here coming up in the spring. Was also seeing if you had any more updates to show us

[jamie]

Just a quick update on my S2 Honda it was mapped last Friday and did rather well! The spec is standard internals same pulley size as I had before (ran at 300hp)The car now has the charge cooler and Toda A3 cams and updated springs this produced 372 at the flywheel or 323 at the flanges - very pleased!

Here is a dyno comparing my car (CC & Toda cams) a car with just the CC & a non cooled car
http://www.dyno-plot.co.uk/dyno/dyno...link/index.htm

[Composites]

I feel like the Hanson Brothers from Slapshot: Foil before every game!

GG, nice job on the gold foil! It looks so much better, lighter, better properties.....joy.

[blairellis]

Originally Posted by ggelise

Hey Blair-

This is the only pic I have but it should give you a good idea how Mark made his supports.

We are waiting on some beefy axles but do have a fuel rail to install, lithium battery, wing etc,.. Not too much remaining. With the economy so screwed up it is good to be getting to the end.

More soon....

Thanks! That looks great! I need a TIG welder so I can do some of this stuff on my own. My A2W setup came in today. If you still have that link, there is some pictures on there of what I got. Getting closer, just like you.

Your build is sweet! Love getting these updates to spice up my day at work.

[jamie]

Originally Posted by ggelise

Charge coolers are what the doctor ordered...what a difference. Congrats on hitting those numbers. The car must be insane. If you do a You Tube clip or have some pics, post them up so we can take a look. With that range of power are you going to upgrade the clutch etc.? Thanks for sharing this.

Mike that is hilarious....what a classic film

We are thinking of doing the rear deck in foil to maintain a stable pressure in the accusump. What do you think? Will probably do a heat shield for the IC barrel in foil also. We are listening, it just takes time to get things ordered. What is up with your customer's car in Australia? Looks like he is pulling out all the stops. Heavily modded s1's Exiges are selling for big bucks over there ...I can only imagine what this guy has in this thing. I lived over there as a kid and remember how expensive it was to bring anything down to the bottom of the earth. What an awesome country!

I picket the car up in the wet so did not really experience anything more than wheel spin But about 40 miles down the road the SC shaft sheared off. The SC has had a hard life already and there is a new uprated version which i will get fitted. So I wont see the car till Jan now

Here is the offending item

There were stress fractures in the metal that had started to Oxygenate so it was a long time coming.

Clutch will get replaced with a uprated version when it fails

Will post some Vid at the end of Jan

Did you have a think about a dry sump for your car?

[Composites]

Originally Posted by ggelise

Mike that is hilarious....what a classic film

We are thinking of doing the rear deck in foil to maintain a stable pressure in the accusump. What do you think? Will probably do a heat shield for the IC barrel in foil also. We are listening, it just takes time to get things ordered. What is up with your customer's car in Australia? Looks like he is pulling out all the stops. Heavily modded s1's Exiges are selling for big bucks over there ...I can only imagine what this guy has in this thing. I lived over there as a kid and remember how expensive it was to bring anything down to the bottom of the earth. What an awesome country!

Dude, thanks for understanding my twisted humor and obsucure movie references!

The accusump's pressure will not benefit from the foil, except inadvertently by keeping the unit cooler. If you have oil temp problems beyond that, consider switching to a water-oil cooler like we discussed earlier. Oil pressure issues will not vanish like they would with a dry sump, but adding this device is a huge improvement and cheap insurance.

Now, back on the temperature issue: Depending on how the exhaust is routed on your car, you might end up with a muffler or some other (read very friggin hot) device directly underneath the accusump. This of course does you no favors and a layer of that foil will most definitely help. The adhesive on that stuff is higher temperature than most and should work fine in that application.

The Australia guy: He's just awesome. Great customer and he did great things with the build to make us all very proud. Top notch guy all around.

[dmh]

Mike-
When you say use a Mocal type oil cooler what water do you use: hot water from the cylindr head, cool water from the radiator, or a seperate heat exhanger?
Thanks

[Composites]

I can't comment on the Mocal portion, I've only seen their oil-air heat exchangers. There's one on my Alfa race car right now.

The water to oil heat exchanger is plumbed into the system via the send and return lines to the heater core. This is heated water, but still cools the oil adequately even in brutal track conditions. In a perfect world, you would plumb cooled water from the return side of the radiator but with the ports staring right at you from the engine block, this seemed so very elegant and easy. The cooling is more efficient than the original oil-air heat exchanger and eliminated some 30 feet of rubber, (as in: not braided), oil lines going back and forth between the engine and the front of the car.

The unit we used on the CFS1 was made by Fluidyne.

[blairellis]

It's a Spearco intercooler and Jaz 1 gal water reservoir. Not sure who makes the heat exchanger as it was given to me by a really generous guy from around here. Maybe I missed this, as I didn't go back and review it before asking, but what kind of pump are you using to circulate the water in the A2W setup?