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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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Good luck Donald, I'm sure she'll be fair flying in the timed runs!! I really love Loton (even though I have only been once) great hill with a bit of everything, and of course great people too. Have fun. :)
Set a new class record of 53.80s on my first run and I have it on video

One more to go...
nice work mate!
Good effort Donald......Mike needed someone to push him on!!
Car looked awesome mate....very smooth

Shame there was no practice run in the morning really
Well done, Donald. I had every confidence you'd do it. :)
Thanks guys, yeah to 'pull one out of the bag' with no morning practice was as good as can be expected (especially with a hangover :lol:). Unfortunately I didn't improve on the 2nd run and Mike took his record back again! The record to beat next year is now a 53.56s.

Overall Tiddles ran great all weekend, the only issue is the starter button failed when I went to load her onto the trailer to come home. Other than that she's been reliable for 5 events in a row.

I'll update later with videos etc. Just back into work with a serious list of jobs to get done so it'll have to wait until later tonight
what is mike's surname and what is he driving?
Mike Turpin, Vauxhall VX220 supercharged - purpose built for the class. It's only 750Kg.

In-Car video uploading now :smthumbup

I'll do a report on the event later when I get time
Somebody please find a tyre sponsor for Donald!
Somebody please find a tyre sponsor for Donald!
Yes, please! :lol:

This is still last years Avons so there's no doubt a new set would have produced quicker times ;)

Here's the in car video:

Still more to come once the driver grows some gonads :lol:
Pretty sure Mike used the car in the Supercar class in Rallycross before turning to Hillclimbing so it's not your average 220! As Donald says it,s very light too and he can fair pedal it.
Tiddles looks proper quick Donald, can't wait to see it in the flesh one day.
Pretty sure Mike used the car in the Supercar class in Rallycross before turning to Hillclimbing so it's not your average 220! As Donald says it,s very light too and he can fair pedal it.
Tiddles looks proper quick Donald, can't wait to see it in the flesh one day.
Yea he was saying he's an experienced grasstrack racer turned hillclimber and the car does look very quick with him at the wheel. It was nice to have someone to push and be pushed by over the weekend, the best way to hammer records ;)

I have some trackside videos, just waiting for them to arrive :)
Here's some trackside videos :smthumbup

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Looks good donald

Is there any plans or upgrades in the pipe line for over the winter, or is that it done
A few plans but they depend on how my other projects go TBH. I have a lot to do this winter as I still haven't managed to finish the extension to our workshop :eek:.

I plan another exhaust for the wastegates on their own as the 3.5" exhaust is too restrictive. This is a big job as space to feed it through under the car is a problem and some other parts will need re-engineered at the same time. I expect the new exhaust to give us more mid and top end though. How much i'm not sure but from data we have I expect another 50hp minimum :D.

The engine will be rebuilt, how far we need to go will depend on its condition, it hasn't been touched in 2 1/2 years :eek:. The side pods and rear bumper are still the original GRP ones so I plan to make carbon and take another 30Kg off the car.

Other than that just the usual stripdown and condition check. No doubt any parts being replaced will be modified into better or lighter parts :lol:

Not much movement on Tiddles so far this winter, too many other things to do :blah:

I've started making the carbon rear bumper/diffuser and hope to have it out of the mould at the weekend. From the area of carbon used in it's construction i'm hoping the complete bumper and diffuser will weigh only 4kg :D

The 'development' GRP bumper that i've been using for 4 years is weighing in at 19kg :eek: as it seems to have absorbed moisture in its core. That should be another 15kg off the car :smthumbup

We still have the engine to rebuild and the new exhaust to make plus a few other mods to the Twincharger system while it's all apart. The side pods are next on the hitlist to be made in carbon

I'll post up some photos of the bumper once it's finished ;)
Sounds interesting Donald, u still thinking of making an all in one rear boot/spoiler?
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