The truth about upgrades...

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jonnyfox
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NA Rocks :grin:
R300
Mr_Shaggy
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[quote=jonnyfox]NA Rocks :grin: [/quote]

So, if I've understood you correctly, and going on the theme of the thread; we all need to remove our superchargers? :cry: :grin:
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moomin
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[quote=Mr_Shaggy][quote=jonnyfox]NA Rocks :grin: [/quote]

So, if I've understood you correctly, and going on the theme of the thread; we all need to remove our superchargers? :cry: :grin:

[/quote]
Or maybe we didn't have superchargers in the first place and we just thought we did ?
tim_marra
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NA on the rocks more likely ;)




:grin:
Porkie
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[quote=moomin]Didn't they know they wasn't buying real beer at the rugby & why & could they of been off there tits before the game ?
Is there such a thing as reverse placebo ?
Oh and Pint of shrooms for me , same again JFK ?
[/quote]

Because it was in france it wasn't very clear that it was Alcohol free... I can't remember what it was called. Will goooooogle
pete757
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[quote=jonnyfox]NA Cocks :grin: [/quote]

Corrected JF! :blush:
jfk
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Been as we're on about 'upgrades' .....

Two items that for me didn't upgrade the car were the Moroso sump and the Helix organic clutch.
Both 'downgrades' in my experience.
I have to say that if anything fitted to my car doesn't improve things then it comes right back off !
Burstner/Ducato Motorhome
Lankan
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Just realised this is an 8-year-old thread, but quite an entertaining one... :D

Back to the topic, I have never been a fan of forced induction, but given that NA options are limited when it comes to Lotus' creations, this is an attempt to understand the pitfalls and improvements one can make to fix any shortcomings.

As such, I am quite interested in understanding the actual reason for 'heat soak' when it comes to supercharged Exiges. Is it because the OEM set up has insufficient air being forced into the intercooler when moving above a certain speed/engine RPMs or is it because the heat generated when there is no airflow through the cooling ducts?

To this end what are the shortcomings of the OEM set up of a 2010 Exige S with the full-length roof scoop and where am I most likely to experience these (e.g. spirited drives on the road, sitting in traffic jams, on tracks with long straights (high speed), more twisty tracks (lower sustained speed), etc)?

Thank you.
Last edited by Lankan on Fri Jul 17, 2020 1:55 pm, edited 1 time in total.
2010 Exige S RGB #138
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Fonzey
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Lankan wrote: Fri Jul 17, 2020 1:38 pm Just realised this is an 8-year-old thread, but quite an entertaining one... :D

Back to the topic, I have never been a fan of forced induction, but given that NA options are limited when it comes to Lotus' creations, this is an attempt to understand the pitfalls and improvements one can make to ix any shortcomings.

As such, I am quite interested in understanding the actual reason for 'heat soak' when it comes to supercharged Exiges. Is it because the OEM set up has insufficient air being forced into the intercooler when moving above a certain speed/engine RPMs or is it because the heat generated when there is no airflow through the cooling ducts?

To this end what are the shortcomings of the OEM set up of a 2010 Exige S with the full-length roof scoop and where am I most likely to experience these (e.g. spirited drives on the road, sitting in traffic jams, on tracks with long straights (high speed), more twisty tracks (lower sustained speed), etc)?

Thank you.
I think there are a few issues that contribute:

- MP62 supercharger is already at the peak of its efficiency, so blows quite hot at the RPM that the OEM Lotus setup generates.
- Stock intercooler isn't that good AND receives poor airflow, you can upgrade the intercooler but benefits are diminished unless the airflow is fixed too. Uprated IC and sidepod ducts offer a really good improvement over stock (measurable, not just "bum dyno").
- Full length scoop doesn't seem to make an appreciable difference, it was an aesthetic upgrade only.
- The intercooler sits right on top of the engine, so just saturates with heat anyway.

I measured, tweaked and tested last summer and I concluded that for a road only car the OEM setup was sufficient. It would soak in traffic yes, but after a few hundred yards at 'cruising' speed it would recover back down. On track it was a different story, the recovery time never happened due to constantly being at high RPM/boost. Adding the ducts helped, a lot - but still after 15-20mins the temps crept up and up.

Stints at high RPM get the temps up, sitting in traffic gets the temps up (albeit slower) and cruising at the NSL would generally bring temps down.

The only real fix is to go A/W in my opinion (charge cool it), but that's only really beneficial for a track car from what I found.
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andybond
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From my research there are a couple of reasons for heat soak.

1 ) Location of the actual air to air intercooler. Its directly above the block which has limited airflow so naturally the heat rises and dissipates some of its energy into the A/A intercooler
2 ) The supercharger is running towards the upper limits of the design for the MP62 anyway so generates a lot of heat for the A/A intercooler to dissipate, but
3) The actual mohawk or even the smaller air ducts on the top of the roof are not very efficient due to size and location. The radiator exhausts are releasing warm air into the intake tract for the intercooler hence not cooling as well as it could.

There are some solutions
1 ) A better core with some cooling ducts as seen with the pro alloy kit
2 ) Chargecooling.

You will note the shortcomings when pressing on and then stopping in traffic and sustained WOT on tracks. For general road use I would wager that you will find it hard to notice any degredation. This is more due to the fact that its a gradual change rather than a somewhat digital change..
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