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Madmac Motorsport's Twincharged Evo 5

598103 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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Small example to aid Donalds thread :)

Blue line, 2.4 4G64, s205, pump fuel (stock TB, manifold)
Green line, 2.2 4G63, 850R, E85 (big spec, fully built)
Red line Madmac's twincharged motor, pump fuel :eek:

Please remember, these are all WHEEL FIGURES.

300ft/lbs ATW at 2850
500ft/lbs ATW at 4000

In excess of 700ft/lbs Flywheel - no surprise questions asked about structural ridigity :mhihi:
:eek::eek::eek: Donalds car is nuts :smthumbup

I take it it's Rog's and my car for the comparison? :blush:
Can you put up the BHP and boost comparison for these? or PM me it?

Cheers Phil
Wow cars looking quick Donald. When You putting some new Avons on?

There is sound with the volume right up btw
So you could have beat your record but ended up in the trees! How much time do you thinks to be gained with new tyres

Yeah strange you got some sound.
Unlucky today Donald, just pipped at the post, made exciting competition though :coolsm:

PS thanks for help with car, enjoyed my first time competing at Fintry, think I'm hooked.:smthumbup
Yea went to the wire! Happy to help and glad you enjoyed the weekend. You did real good for your first time there. Now come to doune! :D
Cheers, was hoping to get more practice before Doune. Doesn't look like much room for error :blah:
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