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Madmac Motorsport's Twincharged Evo 5

598115 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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Congrats on beating the class record at Prescott yesterday (twice) Donald and good to meet you and have a chat.
Brilliant effort Donald. As already commented on, I'd still be getting my tools ready :) Hope all goes well for the weekend.
Brilliant effort Donald. Well done. :smthumbup
Going well, Donald.

Are you doing Loton Park this weekend as we are planing on being there so shall pop along for a chat if you are.
think you should read post 618, he may not get the engine rebuilt in time
I have read it, but given some of the 'miracles' Donald has worked in the past, I wouldn't have been at all surprised to have seen it fixed in time.
Yes motorsport is never cheap, but running the sort of power you are is going to take some deep pockets :lol:

Good luck anyway, Donald, and hope to catch up with you again later in the season.
Have faith. We're talking about Mac the Miracle Worker here :lol:
I find PF 10's work in exactly the same way, Donald. But if you're happy with what you're used to there's no need to change.

May see you at Gurston next month if you're doing it.
Great effort Donald. Have a good weekend and here's to bringing home the silver :smthumbup
I have to say I found exactly the same when I upgraded my rear pads. Was running PF 11's in the front and some unknowns in the rears and the brakes were great. Upgraded to PF11's in the rear as well and was so much better. I now find the car is diving less and the stopping power has improved even further.
Bloody hell I'd need a co driver to remind me which way to go round there :lol:

Well done on the FTD, Donald.
Great result and good reliability - well done Donald.
Brilliant result, Donald. :smthumbup And as an ex single seater competitor I can well image that you are pi**ing a few of them off :lol:
You had a single seater?:eek:
I've had 2 actually Young Un. :D The red one had a GSXR 1000 in it and now lives in Scotland, in fact Donald sees it competing from time to time. The black one had a ZZR 1100 in it and I still see it regularly on ASWMC events.

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Well done Donald and good luck in whatever you decide to do next year.
Wow that is is very impressive power, Donald. Its a real pita having events cancelled due to the weather - this is why we don't have them during the winter, right? :mad:

Anyway, get an entry in for Doune and make all your efforts so far this year pay off.
That was unexpected Donald.
I'm loaded:lol:
One word Young Un ................. NUTS!! ;)
Right, I've just secured my new project so Tiddles is up for sale,
Wow that was quick Donald. You certainly didn't hang around making your mind up so it must be potential FTD material. Good luck and keep us informed on progress. :coolsm:
Yeah, he's buying my car.:D
And how many FTD's have you won in it :mhihi:
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