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Madmac Motorsport's Twincharged Evo 5

597983 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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Here's the trackside video of the record run

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Boyndie Sprint this weekend for a 'last blast' of the season :D

The car needed nothing except a wee top up of engine oil, the first needed all season.

Only my own record to beat again so it's just a bit of fun.

I'll update on my return
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Day 1 of Boyndie sprint completed. Good day for tiddles :)

Lowered the class record by half a second to 63.99s on the first time run then again to a 63.56s on the final run of the day. This secured 9th place in the top-ten run off with another 9 single - seaters battling for points.

Happy to say she's survived another event intact with no work needed done other than clean up the slicks for the same again tomorrow.

No vids yet as I'm still at the event but I'll post a video up when I'm back.

Tomorrow's another day. I reckon more time to be found but it's forecast possible rain in the afternoon
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Well done Donald for a other class record today and getting into the top 10 run offs :)
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Looked good today mate well done, the corner after the back to pits turn off seemed to make a lot of racers slide and go wide
Home with a complete car again:smthumbup

today wasn't quite as fast but only a few tenths off yesterday's record 63.69s. The Avons are about 2/3 done so they are starting to lose their edge. That's a full season they've lasted!

Happy that tiddles has been reliable this year, the only failure being the rear diff at the first doune in April and misfire which turned out to be my own fault :eek:. Other than development and maintenance she's needed very little tbh.

Overall, can't say I'm disappointed in how she goes now. Years of work and improvements have culminated in a seriously quick point to point saloon capable of taking records.

I think I'm 3rd overall in the ModProd division. I missed all 4 forestburn events and the dnf at April doune lost me the overall title. Also heard today that I'm the Grampian Automobile Club champion for the 3rd time :)

That's the last event of the season so now the winter development work starts....

Looking at a turbo change
Air jacks
More diet (me too :lol:)
Engine rebuild
New cams
Wiring changes
Ground radar instead of gps logging
And back to the dyno

Plus many other small jobs.

Videos from the weekend to follow
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Well done Donald. It's been worth the many hours spent. It's came on some over the last few years.
Well done Donald. It's been worth the many hours spent. It's came on some over the last few years.
Emphasis on the MANY hours spent :lol: :eek:

Here's the in-car first Top-Ten runoff video:

Trackside video to follow
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Here's the trackside video. Chris (Randolph) and I on the track at the same time:

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I reckon those slicks would find me those missing 6 seconds :/

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I reckon those slicks would find me those missing 6 seconds
Get a set of 9" rims and the Avons should fit under your arches ;)
it is crazy narrow there Donald is not it. I would bin it for sure in the first 20 seconds. Respect.
Donald, are you still running a radiator in the car? also do you still have coolant flowing around the whole engine or just the head?
Donald, are you still running a radiator in the car? also do you still have coolant flowing around the whole engine or just the head?
Yeah a standard radiator. The engine block is the very same block that the car left the factory with too. The block has full coolant flow as per standard engine ;)
The block is on its last bore, so the winter refresh may result in a replacement block needing sourced. I won't know until I open it up and get the micrometer out. There's no signs of any issues so hopefully it'll be a quick tear-down and rebuild. At least I know this block is a properly 'seasoned' block ;) :lol:

I'll be looking into possible part-filling the block with chemical to strengthen it if I go with the bigger tubby this winter. Hoping to avoid it though.
You could sleeve the block and keep it numbers matching
You could sleeve the block and keep it numbers matching
I was going to look into that over the winter :smthumbup
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