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Madmac Motorsport's Twincharged Evo 5

598103 Views 2421 Replies 217 Participants Last post by  Madmac
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During the winter build of the old Evo 5 hillclimb slag I decided to look at ways of reducing the turbo lag which was becoming an issue and costing precious hundredths of seconds on the hills last year. It never lacked top end power but the lag really started to get to me and i knew i could make it quicker point to point by reducing the lag - but keeping top end power.
I looked at many possible ways to do this but in the end settled for adding a supercharger to run in conjunction with the turbo.

Designed and built by myself with input from friends and members on MLR, most parts have been fabricated in my garage from whatever was lying around, the end result has been worth the blood, Sweat and tears I've put into this.

We've had her on the dyno at Wallace Performance in Aberdeen and had surprisingly few teething problems considering the unknowns and the huge amount of bespoke parts that needed to be designed, fabricated and made. Initial mapping is done now and the whole package is showing some serious potential! We've decided to keep the system at it's minimum until i do reliability tests and learn how to drive it properly :angel:

I've also designed and built a tubular front subframe and arms (total 9Kg:D) to reduce front weight and while i was at it, it seemed rude not to play with the suspension geometry!

I want to thank a few people for their input and help:

Russ and the guys at Wallace Performance who did the mapping and supplied parts/tea/banter etc. Top guys and never ones to shy from a challenge! Can't thank you enough:smthumbup:D. http://www.wallaceperformance.co.uk/

My mate Steve Marr who is the main technical guru, and who i regularly bugged to ask lots of questions on a daily basis:smthumbup.

My mate Graeme Wight Jnr for his help with the front subframe and major suspension geometry changes, Exhaust and general setting up

Alan Young Engineering Ltd for the quality machined bespoke pulleys and parts, Spot-on parts and great prices http://www.timingbeltpulleys.co.uk/pages/home.php

And everyone else who suffered because of my constant lust for knowledge during the build:smthumbup:D

As yet i've to do some miles and get her setup for the start of the 2010 Scottish Sprint & Hillclimb Championship, so for the moment i'm being realistic about expectations & screwing the nut until i check everything over and get used to driving it. Hoping to do some track testing soon though. I've had her out for a short drive and so far the whole package is working impressively. Instant delivery at anything above 2500rpm with absolutely awesome accelleration in every gear! This is on it's lowest boost setting too....

Over the next few months The guys at Wallace Performance & I are going to refine some of the setup and see what she's really capable of! We know we can find a lot more power & torque with some simple changes.

Meantime i'm happy with the initial results and looking forward to Doune Hillclimb in 2 weeks:D:D Should be fun!

Keep watching....;)

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Yup I totally agree. Had someone slagging me off on Facebook yesterday for a problem caused elsewhere. The reason why is obvious and fundamental. There are some right to55 pots about these days doesn't matter where you turn!!
Bloody Facebook wars lol... there is good and bad about social media and sometimes the bad far outweighs the good, but it's the same for forums from what I've experienced :blah:

Good work Donald.
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Well done Donald another awesome project.

Jon.
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the irony!

Much better to be up front, social media last resort I guess, much better to be 100% honest though, too many things are swept under the carpet in this game,
:shake:

Anyway, back to donald's thread.
Managed to make a start on laying up the carbon today. It's deciding how many layers, where to brace, thicken edges, where to put the peel-ply (so adhesive bonds) etc. that's the difficult bit. So far I've used 800g of carbon and honeycomb on the main outer shape. I need to make sure the finished boot lid will be able to carry the weight of the wing when it's producing down force. The inner skin is going to be a real headache to lay up as it's all curves. Adhesive to bond both parts together may push the weight.up a bit. So far so good though, tomorrow I'll get it bagged ready for the oven on Tuesday.
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can't you just mount the wing on the quarter panels at each side of the boot? you can keep the same sillouhette and have a wider wing.
can't you just mount the wing on the quarter panels at each side of the boot? you can keep the same sillouhette and have a wider wing.
I could do that yes, but it would mean making a new rear wing buck then a mould again and to be honest - there's enough downforce at that end of the car from the wing and venturi as it is so why go to all that extra work?
I could do that yes, but it would mean making a new rear wing buck then a mould again and to be honest - there's enough downforce at that end of the car from the wing and venturi as it is so why go to all that extra work?
because you are saying its a lot of work to make the boot strong enough.
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because you are saying its a lot of work to make the boot strong enough.
It's much, much less work to make the boot strong enough to take the wing I have though. All it takes is a few extra layers in key areas but deciding how much and not go overboard is the tricky bit
It's much, much less work to make the boot strong enough to take the wing I have though. All it takes is a few extra layers in key areas but deciding how much and not go overboard is the tricky bit
ok. I just also think its better to have it mounted on something a bit more solid:)
ok. I just also think its better to have it mounted on something a bit more solid:)
It will be rigid enough for the job ;)
can't you just mount the wing on the quarter panels at each side of the boot? you can keep the same sillouhette and have a wider wing.
Then he wouldn't be able to open the boot lid to get his shopping in! :rotz::lol:
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Then he wouldn't be able to open the boot lid to get his shopping in! :rotz::lol:
you just lift it up and forwards like I do on mine;)
you just lift it up and forwards like I do on mine;)
I still have hinges on my boot....
4kgs. Take em off. :blah:
Really? Never had them out to weigh them. The spring bars need to go this year as the boot will be far too light. The varis bootlid is light anyway and bounces off the stops hard. Technically the hinges and springs are part of the bodyshell - and in between the wheelbase so removal could be against the rules for MSA ModProd Division. It depends how the rule is interpreted.
Really? Never had them out to weigh them. The spring bars need to go this year as the boot will be far too light. The varis bootlid is light anyway and bounces off the stops hard. Technically the hinges and springs are part of the bodyshell - and in between the wheelbase so removal could be against the rules for MSA ModProd Division. It depends how the rule is interpreted.
Yep, 4kgs.
Really? Never had them out to weigh them. The spring bars need to go this year as the boot will be far too light. The varis bootlid is light anyway and bounces off the stops hard. Technically the hinges and springs are part of the bodyshell - and in between the wheelbase so removal could be against the rules for MSA ModProd Division. It depends how the rule is interpreted.
I came to the same conclusion Donald, There only just forwards of the rear shocks..
Like none of these mod prod cars have no metal removed between the wheel bases :lol:
I came to the same conclusion Donald, There only just forwards of the rear shocks..
Are they part of the 'unitary structure' though? In the spirit of the rule they should be ok to come out. It would take someone's £200 to hit the table to find out for sure. I would argue that they aren't part of the structure. :angel:
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Are they part of the 'unitary structure' though? In the spirit of the rule they should be ok to come out. It would take someone's £200 to hit the table to find out for sure. I would argue that they aren't part of the structure. :angel:
With the blue book I think it can get far to anal and end up with half of the attendees being sent home if arguments start. :blah:
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