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Madmac Motorsport's Twincharged Evo 5

598536 Views 2421 Replies 217 Participants Last post by  Madmac
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.

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

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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Hope to go to Harewood at some point this year but as yet not 100% sure. With such a poor budget I never know if I'll be able to afford these extra jaunts down south. I intend to do the final Loton Park BHC event this year so I can't go spending lots on too many other events.

Have just had some additional expense on Tiddles & getting her MOT'd and ready for Kames next weekend
ah kames, shame there's no fast class d cars going :blah:
The weather held out for most of the day at Alford today so a decent amount of seat time for us.

Started the day on a damp track with a low 52s, below last years class record ;)

Next practice was a similar time (can't remember exactly :eek:). Competition run 1 was a drying track although for all purposes it felt pretty dry to me. Lowered the class record to 51.76s then on T2 lowered it again to 51.64s :D

I'd had the supercharger and turbo off to do some maintenance through the week and all day today we only had 1.8bar boost. There's nothing obviously wrong so it could be a pita to find the issue before Kames on Saturday.

Overall a good day. Despite the low boost she ran well and the launches were improving.

Here's the trackside run:

In-car video:
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Congrats on yet another record mate :smthumbup
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Well done Donald!! :smthumbup

More to come too.
Well done Donald!! :smthumbup

More to come too.
Yeah for sure. Just wish she would stay consistent between events! This latest boost issue is probably my own fault :wallbang:
As suspected the boost issue was my fault and turned out to be a simple fix. Nothing mechanical was wrong and the Twincharger system is all good. She was running with the system minimum 1.8 bar at Alford and still went well :lol:

I'm going to change the clutch plates this weekend as they are looking quite worn now. I usually replace these every winter but didn't have the spare zoids this year to do them so with the next event in a couple of weeks it makes sense to pre-empt any clutch issues. The gearbox will be coming out as my new Samsonas box will be here soon(ish) but I can't rely on the clutch lasting until the box is swapped over. Luckily the box only takes an hour to remove ;)

I'll update nearer the next event and after a proper road test
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Kenny less cake means more zoids for da evo. :crackup:
wow, I used to have some zoids :D
So did I - before I had an Evo :lol:
wow, I used to have some zoids :D
Is that northern speak for Michael Miles? :D
Is that northern speak for Michael Miles? :D
you'd know about that better than me gramps :lol:
Am at harewood hillclimb this weekend. Was wet but dried up for one run this morning so a 59.88s run now in the bag. Heavens just opened again so looks like the record isn't achievable today :wallbang:

am here for tomorrow too. Forecast is supposed to be better but not seen any recent updates.
Well it dried out for the last run of the day so ended with a 59.44s run and a class win. Getting good seat time although the changing conditions are making it difficult to get up to speed. Not been here since last year so I need to get used to the track again.

Tomorrow's another day so we'll see what it brings :)
I'll be along tomorrow to see how you get on:)
Hope you get some good weather.:smthumbup
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not a bad time that Donald. tomorrow will be interesting if it's dry.

what was your terminal speed? web results 02 aug 2014.pdf

59.46 sounds like weather was similar to a few years back when we were both there.

Weather looking better today, good luck on charging for the record, wish I was there to push for it as well.
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