HELP WITH IAT'S! - LotusTalk - The Lotus Cars Community
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post #1 of 15 (permalink) Old 04-24-2017, 02:13 PM Thread Starter
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HELP WITH IAT'S!

Hey guys, so the first track day is in the books and I have a big issue. My IAT's are through the roof. This is not an issue for a street car but after a few hard laps they are approaching 200 and always over 140. Now the best solution would be a charge cooler but it adds weights. Also, I don't plan on keeping the 2zz for more than a year maybe 2 so I don't want to invest the big $ for the charge cooler. With that said I know a lot of people are running the tubes to the intercooler. Does anyone have any documented info on the IAT's? Also, what about the radical idea of putting in a small fan in the shroud for track days only.
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post #2 of 15 (permalink) Old 04-24-2017, 02:45 PM
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Get the RLS intercooler with 3 chamber shroud and heatshield.

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post #3 of 15 (permalink) Old 04-24-2017, 02:57 PM
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Shay's right about the heat shield - cheap and practical. Every race prepped Exige I've seen has one.

In general:

1. Get more air to the IC by means of additional ducting.

2. IC fans are best for street use to combat low speed heat soak. A UK race team tested IC fans on the track years ago and found the flow rate became truncated too much at speed (fans can only move so much air).

3. A2A intercooling is best suited for track duty.

4. A2W chargecoolers are ideal for drag or street use as the power demands are more temporary. Water retains heat longer than air, so long duration power demands will not benefit you with this setup.
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post #4 of 15 (permalink) Old 04-24-2017, 03:04 PM
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Originally Posted by shay2nak View Post
Get the RLS intercooler with 3 chamber shroud and heatshield.
Only if you want to send someone money and get nothing in return...

2007 Exige S with almost every track mod...
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post #5 of 15 (permalink) Old 04-25-2017, 07:49 AM
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Only if you want to send someone money and get nothing in return...
Are you saying the new RLS owner is a scammer ?

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post #6 of 15 (permalink) Old 04-25-2017, 08:29 AM Thread Starter
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Any one have any IAT data on the track with the cooling tubes and shroud?
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post #7 of 15 (permalink) Old 04-25-2017, 09:40 AM
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Are you saying the new RLS owner is a scammer ?
Not saying he is, but I will never buy any products directly from them...

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Originally Posted by Rza.I View Post
Any one have any IAT data on the track with the cooling tubes and shroud?
Have an email?

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post #8 of 15 (permalink) Old 04-25-2017, 10:35 AM
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BOE Intercooler

High IATs on the Exige are common. 200F+ is common. With a quality bar and plate IC and additional airflow, you can drop those temps a good bit.

We have a very nice A/A intercooler.. We use the same Bell bar and plate core that the RLS IC uses but improved the side tanks and installation so it's now plug 'n play (no new mounting brackets, etc). This reduced cost by a lot so the kit now only costs $900. Also added a boost pressure port on the outlet side for logging, monitoring, etc (super helpful!)... They are anodized black. Our laser is in-house and for the time being (ie we may not do custom laser etching forever), we're happy to laser etch the top plate or rear facing bars and fins with a graphic of your choosing if you would like to add some "flavor" to your engine bay as a complimentary service...

For additional cooling air, we keep the requisite 2" ducting in stock along with some aluminum "speaker ports" that are easy to fab into the stock shroud and pull some additional air in... Hope that helps,

Phil
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post #9 of 15 (permalink) Old 04-25-2017, 12:24 PM
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I never saw this intercooler on your website ? Where it is ?

Quote:
Originally Posted by turbophil View Post
High IATs on the Exige are common. 200F+ is common. With a quality bar and plate IC and additional airflow, you can drop those temps a good bit.

We have a very nice A/A intercooler.. We use the same Bell bar and plate core that the RLS IC uses but improved the side tanks and installation so it's now plug 'n play (no new mounting brackets, etc). This reduced cost by a lot so the kit now only costs $900. Also added a boost pressure port on the outlet side for logging, monitoring, etc (super helpful!)... They are anodized black. Our laser is in-house and for the time being (ie we may not do custom laser etching forever), we're happy to laser etch the top plate or rear facing bars and fins with a graphic of your choosing if you would like to add some "flavor" to your engine bay as a complimentary service...

For additional cooling air, we keep the requisite 2" ducting in stock along with some aluminum "speaker ports" that are easy to fab into the stock shroud and pull some additional air in... Hope that helps,

Phil

07 Exige S300+,Solar Yellow,Touring Pack, Torque300 tune,RLS Intercooler,Pro Alloy IC tubes,Lotus Stage3 Exhaust,Intake BOE ITG cold airbox,RLS MKII 3.0 Pulley,SaikouMichi Oil catch can,NGK BKR7-EIX Plugs,EV14 525cc injectors,CarbonFiber side scoops+front lip+rear spoiler, Nitron SS Shocks, PC680 Battery,JVC KDNX5000,CompactSub Kenwood KSC-SW1,Tinted windows, Lotus Sport windshield+front plate decals,HID Kit 6000K,Parking Light,license Leds.
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post #10 of 15 (permalink) Old 04-25-2017, 12:49 PM
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post #11 of 15 (permalink) Old 04-25-2017, 05:36 PM Thread Starter
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Originally Posted by EpRAnGia View Post
Not saying he is, but I will never buy any products directly from them...







Have an email?


[email protected] please send data! Thanks you


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post #12 of 15 (permalink) Old 01-30-2019, 10:25 AM Thread Starter
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Figured I would give an update on this. So after much deliberation between a Water to Air and Air to Air I ended up going with the Pro Alloy A/A kit with supplemental cooling tubes. I am also using a "mist kit" basically a water/meth kit that will spray distilled water in front of the intercooler during high boost. Also went with a bigger scoop and "ported" it out to get as much air flow as possible.

My on track IAT's were crazy high with the smaller pulley and all, and a known issue with these cars. Will report back with data after the install and road tests are done!
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post #13 of 15 (permalink) Old 01-30-2019, 11:06 AM
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Have you bypassed the coolant line to the throttle body? Although small compared to the heat generated by the supercharger, it's still a source of IAT heat soak.
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post #14 of 15 (permalink) Old 01-30-2019, 11:24 AM Thread Starter
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Have you bypassed the coolant line to the throttle body? Although small compared to the heat generated by the supercharger, it's still a source of IAT heat soak.
I have not can you elaborate?
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post #15 of 15 (permalink) Old 01-30-2019, 01:23 PM
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Pretty much all throttle bodies on street cars have a cooling water source heating them to prevent ice formation in temperatures around 5-10c/40-50f.

On a track only car, you can probably just disable this by putting a plug in one of the water hoses going to the throttle body, or delete and cap the hoses entirely. For a car to be street driven, I'd probably look into putting a valve on one of the hoses that you could turn off in hot weather or on track days.
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