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Madmac Motorsport's Twincharged Evo 5

598125 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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Catch him if you can boys :lol:

Good luck this season Donald!:smthumbup
Just like a rally car with those short shifts. It's as if the car isn't even trying.

Have you got any in-car Doune vids from last year for comparison?
Hasn't one of those mental Audis got the record there donald?
Yeah, the record in ModProd of 29.16s was set by the Audi RS4 4.2l turbo of Roger Banks back in 2007
Are you going back again?
Sounds like you could get it no problem.
Donalds going well today :smthumbup Looks like a sunny day again tomorrow . Anyone pupping over ..?

Come on give is the times and what is the records to beat?
Finished on new class record of 45.13s - 1st timed run today, almost 1.5s lower than the record set in April. Tried to lower it again on the 2nd run but tried too hard and lost the line into Garden gate and a 45.8s - both lower than last years personal best of 45.96s :D
0.83 quicker than last year? :eek: That's a MASSIVE difference mate. 44s next time? When are you coming to Harewood to get that record which has stood sicne 2004?
Remember not to go on the British Championship days mate as the records don't count.
Well done for today mate :) cars going very well..
Saturday me and john had a run each ,then john got the box locked up . So back to his and stripped it down and got back missing the end of day . Sunday same again and no runs for me ...
Thats sprinting ..
See you at Harewood then Donald ...
2 dual drives 2 locking boxes Paul! Do remember to use the clutch next time:lol:
I think you'll find they should count regardless of when they're set. They certainly have at every other British round i've been at
Paul told me otherwise mate.:confused:
You just said records don't count as we are In that silly yorkshire class.looks like the brit record is up for grabs and not the Barc?
Forrestburn Hillclimb this weekend, engine is running well. Doune was a good test for the engine & suspension, happy to report no ill effects other than a spherical bearing starting to wear on the front lower arm. I've adjusted the front and rear ride heights and set more rear droop which i'm hoping will help stability under hard braking. Made a new splitter and tidied up some of last years battlescars.:D

It'll be interesting to see how much difference the supercharger makes at this hill. Doune and Fintray are power hills, Forrestburn is handling, technical and usually where the old turbo lag slowed the car down. Have a PB of 46.47s to beat
I've never done this hill but it's my favourite one to watch on youtube. Looks like a real rally stage. You will p*ss your record there with no lag. You doing Harewood on the weekend after?
Well doen Donald...but cars like this are in your class?


Slightly lighter then?:lol:

How did you find the Nitrons compared to the hotbits?
Donald are you sure the clutch was slipping and not just tearing tarmac up? :lol:

Super Rover on here said it looks laggy:lol::handsup:

How much boost have you got by 3k revs?
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