100mph Lucky Poos Needed

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RiftAmpsRiftAmps Frets: 1689
in Off Topic tFB Trader
About this time last year, I was invited on a track day by a friend who owned a mk1 MX5 that had been stripped out and fitted with the standard level of performance upgrades (coilovers, SS exhaust, performance air filter etc). We had a great day and went ahead and booked some more over the Summer with no real plans to do anything but that. Lots of fun driving Silverstone, Donington Park etc and seeing how good/or bad we really were!

This was fine until we went to a 750MC meeting at Silverstone to watch some club racing and see how things are done at that level. After seeing how close and frantic the racing was we devised a plan over a burger and chips to go racing ourselves. We duly booked and passed our ARDS test and became proud holders of National B race licenses.

Then the real work began, reading through MSA (now Motorsport UK) regulations to see what would be required to turn the MX5 into a race car that would pass scrutineering. We looked at various championships and found a series called Roadsports, run by the 750MC. The races are 45mins+1lap with a mandatory pitstop, so crucially Nick and I could share the car and costs. Performance mods/upgrades are pretty much free. The grid is split into four classes, based on power/weight ratio - https://www.750mc.co.uk/formulae/roadsports.htm

A - Super GT - 300bhp/tonne
B - GT - 240bhp/tonne
C - Supersport - 180bhp/tonne
D - Sport - 145bhp/tonne

We'll be running in Class D, as our MX5 only puts out 115.8bhp and weights 930kgs without driver (124.5bhp/tonne!!)

So, the build began...


Custom-fab roll cage built to regs including door bars (we found a local motorsport business to make/fit this for us). They also welded in the correct seat/harness mounts as req. by the regs.





Then we painted it black (rattle cans of course)



Swapped out the K&N cone air filter for a NACA duct that sits in the headlight assembly and runs a cold air feed straight into a stock airbox with a performance panel filter



Most of the work req. is for safety, so had to disengage the keyed ignition and move everything to a switch panel on the centre console. An electrical cut-off and fire ext. system was also installed at the same time


Tombstone panel in place with switches and push-button start


The completed car at the official 750MC test day at Donington Park



Had to get the car Dyno'd and weighed



115.8bhp flywheel and 141.5Nm torque, careful now ;)




...and out on track




Why am I asking for lucky poos? Well, our first race is this Sunday 14th April at Brands Hatch and we need all of the help we can get.

The entry forms show only two other cars in our class (most seem to run in class C, 35 car grid), a mk2 Golf GTi and a BMW Compact. This means we'll get on the class podium if we finish the race...seems a good enough target :)

Nick is starting the race and I'll be bringing it home, fingers and nuts crossed.

If anyone fancies coming down to watch, our race is at 3:30 pm but there's racing all day long. Tickets on the gate are £16.

If you can't make it, you can follow the live timing online:



We've entered 7 races this year, will keep this thread updated with progress :)
*I no longer offer replacement speaker baffles*
Rift Amplification
Handwired Guitar Amplifiers
Brackley, Northamptonshire
www.riftamps.co.uk

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  • FunkfingersFunkfingers Frets: 4803
    RiftAmps said:
    We've entered 7 races this year, will keep this thread updated with progress :)
    I have every confidence that you will make a small fortune ... out of a large fortune. ;)
    Be seeing you.
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  • JalapenoJalapeno Frets: 3850
    Just finish my amp & cab first !!!!! ;)
    Imagine something sharp and witty here ......

    Feedback
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  • sweepysweepy Frets: 2582
    Jalapeno said:
    Just finish my amp & cab first !!!!! ;)
    And mine ;) , seriously though, good luck and happy cadence braking 
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  • stickyfiddlestickyfiddle Frets: 11692
    Love it! 

    Let me know if you end up at Snetterton at any point - my family are all up that way (sis has a business half a mile from the circuit) and my Dad is a keen motorsportist :)
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  • RiftAmpsRiftAmps Frets: 1689
    tFB Trader
    Love it! 

    Let me know if you end up at Snetterton at any point - my family are all up that way (sis has a business half a mile from the circuit) and my Dad is a keen motorsportist :)
    We have a double-header 12th/13th October at Snetterton 300 :)
    *I no longer offer replacement speaker baffles*
    Rift Amplification
    Handwired Guitar Amplifiers
    Brackley, Northamptonshire
    www.riftamps.co.uk

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  • FelineGuitarsFelineGuitars Frets: 6359
    tFB Trader
    Shouldn't there be Rift Amps sponsors labels on the car?

    Many guitars have a re-sale value. Some you'll never want to sell.
    Stockist of Earvana nuts, BKP, Oil City And Monty's pickups. Sperzel, Tonepros, Gotoh and Graphtech too!
    Expert guitar repairs and upgrades - fretwork our speciality! www.felineguitars.com.  Facebook too!

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  • stickyfiddlestickyfiddle Frets: 11692
    RiftAmps said:
    Love it! 

    Let me know if you end up at Snetterton at any point - my family are all up that way (sis has a business half a mile from the circuit) and my Dad is a keen motorsportist :)
    We have a double-header 12th/13th October at Snetterton 300 :)
    Great! I'll let them know :)

    I'd try and get over there at the same time but we're off to Japan the following week so it's very unlikely, sadly!
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  • monquixotemonquixote Frets: 9029
    Awesome work.

    Good luck!
    Handsome_Chris said: Like white Nile Rodgers. 
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  • FX_MunkeeFX_Munkee Frets: 2222
    hmmm looks like a UK spec 1600 :)
    Is it still running the standard brakes? Easy upgrade is to get the caliper carriers from an 1800, then the 1800 discs will fit.
    Have fun!
    Shot through the heart, and you’re to blame, you give love a bad name. Not to mention archery tuition.
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  • RiftAmpsRiftAmps Frets: 1689
    tFB Trader
    FX_Munkee said:
    hmmm looks like a UK spec 1600 :)
    Is it still running the standard brakes? Easy upgrade is to get the caliper carriers from an 1800, then the 1800 discs will fit.
    Have fun!
    We run standard Brembo discs with cooling ducts, and race spec pads. NA8 brake upgrade planned over the summer once we've used up our stock of NA6 stuff.

    Along with a race spec engine that I'm building, we've got a host of other stuff we need to get done to get us closer to the class bhp/tonne limit.



    *I no longer offer replacement speaker baffles*
    Rift Amplification
    Handwired Guitar Amplifiers
    Brackley, Northamptonshire
    www.riftamps.co.uk

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  • MrBumpMrBump Frets: 730
    Class D rather than Class A or A/B?

    :)
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  • FX_MunkeeFX_Munkee Frets: 2222
    Are you allowed a custom ECU? That helps a lot with a naturally aspirated MX-5 engine. You can ditch the Flappy MAF which really helps. Also the NACA duct is ok but you can get high pressure air from in front of the windscreen, need to cut a hole in the firewall though see http://mx5driver.com/thread/6151/randall-cowl-intake-na-nb

    And now I'll stop waffling/explaining egg sucking techniques.

    Shot through the heart, and you’re to blame, you give love a bad name. Not to mention archery tuition.
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  • RiftAmpsRiftAmps Frets: 1689
    tFB Trader
    FX_Munkee said:
    Are you allowed a custom ECU? That helps a lot with a naturally aspirated MX-5 engine. You can ditch the Flappy MAF which really helps. Also the NACA duct is ok but you can get high pressure air from in front of the windscreen, need to cut a hole in the firewall though see http://mx5driver.com/thread/6151/randall-cowl-intake-na-nb

    And now I'll stop waffling/explaining egg sucking techniques.

    Yeah, we can run pretty much what we want, unlike the MX5 cup which is massively restricted (basically stock). The engine I'm building has a .25 overbore with forged pistons/rods, and a super aggressive set of cams. We'll run it all with a ME221 tuned for 14.5:1 AFR throughout the rev range/tp.

    On the longer Club Enduro races (2-3 hours), we need to achieve 1 hour of running from a full tank so performance gains are limited by fuel consumption/range.

    The NACA duct is pretty standard for most MX5 racers and most of the teams running tuned setups agree that is the best way to go unless opting for ITBs. Would have to check the regs about maximum hole sizes in the firewall but I know they don't like it other than for fire suppression systems etc.


    *I no longer offer replacement speaker baffles*
    Rift Amplification
    Handwired Guitar Amplifiers
    Brackley, Northamptonshire
    www.riftamps.co.uk

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  • NPPNPP Frets: 157
    Good luck!

    I dream of doing something similar, have done quite a few trackdays but time and space constraints mean racing is out of the question sadly. I hope you enjoy it!

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  • thumpingrugthumpingrug Frets: 1618
    I had an MX5 years ago, great little car and great to dive.  I envy you and hope you have a fantastic time.  Keep us all informed of your progress and good luck.

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  • NelsonPNelsonP Frets: 1075
    edited April 11
    That looks absolutely awesome. I used to race karts and have always wanted to do exactly what you are doing now.
    My old teammate and I have a deal that if either of us win the lottery we will fund the other one through a season's racing.
    Just need to win the lottery now.

    I once had a chat with Tom Chilton about Brands. He said if you have someone up your chuff coming onto the pit straight the trick to not being passed at Paddock is to lift off as you come out of Clark curve. Then the guy behind will lift off, brake or even tap you, at which point you are back on the power and already pulling away from him. A little risky / dirty but then I guess that is the BTCC. Probably not a good idea to try it on your first outing.

    Best of luck!
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  • PhilW1PhilW1 Frets: 254
    Where’s the speakers and strings?
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  • rsvmarkrsvmark Frets: 693
    PhilW1 said:
    Where’s the speakers and strings?
    No sat nav? Not even a phat sound system.....
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  • olafgartenolafgarten Frets: 1499
    This is amazing. I love the lower level motorsports, os much more interesting then things like F1!
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  • RiftAmpsRiftAmps Frets: 1689
    tFB Trader
    Got to Brands at 7am, all signed on, just waiting for scrutineering
    *I no longer offer replacement speaker baffles*
    Rift Amplification
    Handwired Guitar Amplifiers
    Brackley, Northamptonshire
    www.riftamps.co.uk

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  • rsvmarkrsvmark Frets: 693
    RiftAmps said:
    Got to Brands at 7am, all signed on, just waiting for scrutineering
    Brands is a hell of a track. Well it is on a bike. Full circuit? 
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  • RiftAmpsRiftAmps Frets: 1689
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    We finished P27 on the road, but unfortunately got disqualified for repeated track limit infringements - turns out I like to ride the kerbs, hard ;)

    Absolutely incredible day and now all I want to do on my days off is go racing. The car is a hoot to drive and I had a huge smile on my face as I managed to keep the #66 BMW 116 behind me for about 10 laps to the end. 


    *I no longer offer replacement speaker baffles*
    Rift Amplification
    Handwired Guitar Amplifiers
    Brackley, Northamptonshire
    www.riftamps.co.uk

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  • RiftAmpsRiftAmps Frets: 1689
    tFB Trader
    Full race onboard



    *I no longer offer replacement speaker baffles*
    Rift Amplification
    Handwired Guitar Amplifiers
    Brackley, Northamptonshire
    www.riftamps.co.uk

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  • NelsonPNelsonP Frets: 1075
    edited April 20
    That looks brilliant!

    Squeaky bum moment on the way into paddock at 16.50.

    Some of those other cars are fast, that winged bmw, the caterham and the cayman in particular.

    Whoever was wearing the open face helmet.....it's hard to be sure from the video but it looks like your turn in is a little early at mclaren and this is slowing you down through clark, leaving you open to being overtaken down the straight?

    Was it the use of the kerbs at graham hill that led to the disqualification?

    Also, one of you is using 2nd gear at druids, the other isn't. Would be interesting to compare your laptimes / splits to see which is faster.  Could well be that 3rd gear is both quicker and easier on the car?

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  • RiftAmpsRiftAmps Frets: 1689
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    NelsonP said:
    That looks brilliant!

    Squeaky bum moment on the way into paddock at 16.50.

    Some of those other cars are fast, that winged bmw, the caterham and the cayman in particular.
    The speed differences are insane, yet watching their onboards it looks pedestrian!


    Whoever was wearing the open face helmet.....it's hard to be sure from the video but it looks like your turn in is a little early at mclaren and this is slowing you down through clark, leaving you open to being overtaken down the straight?
    Nick started, I finished.

    Mclaren is mega tricky to get right, seems to be a million different lines through there and it's VERY slippery on the outside. Probably the corner that scared me the most.

    Was it the use of the kerbs at graham hill that led to the disqualification?
    Yup!

    Also, one of you is using 2nd gear at druids, the other isn't. Would be interesting to compare your laptimes / splits to see which is faster.  Could well be that 3rd gear is both quicker and easier on the car?
    The 2nd-3rd synchro is on its way out, so I had to stay in 3rd for my stint and try to carry more corner speed. You can hear Nick slamming it into 3rd and crunchy noises ensued.
    *I no longer offer replacement speaker baffles*
    Rift Amplification
    Handwired Guitar Amplifiers
    Brackley, Northamptonshire
    www.riftamps.co.uk

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  • RiftAmpsRiftAmps Frets: 1689
    edited July 10 tFB Trader
    aaaaaaannnndddd we're back.

    We had to miss the second round of the season at Croft as Nick got married, so we're now looking forward to the next race on Saturday 20th July, at Cadwell Park, Lincolnshire. We've also entered the remaining races of the season at Donington Park, Snetterton, and Silverstone.




    As neither of us have driven Cadwell before, we've taken the opportunity to join the official test day on the Friday, which will give each of us valuable track time to learn what everyone calls "the mini-Nurburgring". One thing that we discovered at Brands Hatch was how little time you actually get to learn the track and practice. If you only enter the race you get 25 mins to Practice/Qualify, which of course is split between two drivers so at most 5/6 laps each before the race, not a lot at all! The Friday test day will allow us to get some dedicated seat time (2x35mins each) that will hopefully translate into better results.

    The car needs a little work after the last race, mainly swapping over the fuel filler neck to a non-restricted one so we can get our fuel churns in and not have to refuel at the petrol station every time. The engine-cutoff pull cable snapped too so we've got to fit a replacement. A simple nut and bolt check and we'll be good to go.

    However, I've stripped down, ported, polished, cleaned, and refreshed a new cylinder head fitted with Piper 285H race cams, so we want to get that onto the car to give us some more top-end power. They say it'll be worth an extra 15bhp with the factory ECU. The entry list for our class is 6 cars strong (2 x BMW 318s, 2x Toyota MR2s, a Pug 106, and ourselves) and we think they're all running at the class limit so every bit of power is welcome.

    If you'd like to see us race, tickets are £12 per adult, £8 for 12-15s, and children go free. If you enter voucher code 750MC you'll get some discount off those prices - https://cadwellpark.msv.com/CP-19-750

    *I no longer offer replacement speaker baffles*
    Rift Amplification
    Handwired Guitar Amplifiers
    Brackley, Northamptonshire
    www.riftamps.co.uk

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  • NelsonPNelsonP Frets: 1075
    I am green with envy!

    Good luck. Stay off those kerbs ;-)
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  • RiftAmpsRiftAmps Frets: 1689
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    Cadwell Prep begins:


    Removing the old cylinder head









    ...and the new one installed and running.






    We've still got to break it in, which the Friday test day will be perfect for and then we'll do an engine oil&filter change ready for race day. The hydraulic tappets were quite noisy but I completely disassembled and cleaned all 16 of them, so when they finally fill up with oil and reach operating pressure they should quieten down.

    One thing to note: the idle is rougher now (as expected) so wouldn't recommend these camshafts on a road car, we've had to set base idle 100rpm higher to keep it stable. Piper do a milder profile - 270H- for road use. The engine does sound better under load and definitely has that race car burble - I'll try and get some better video when it's all settled down.

    It took us 9 hours in total to do the swap, but some of that was taken up by replacing seals and hoses whilst we had it apart, along with troubleshooting a few small issues. This race head will need to be refreshed after 30 hour's use so hopefully next time it'll be a quicker changeover.

    A final few bits to finish off tomorrow and she'll be race-ready:)
    *I no longer offer replacement speaker baffles*
    Rift Amplification
    Handwired Guitar Amplifiers
    Brackley, Northamptonshire
    www.riftamps.co.uk

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  • Electro_HamElectro_Ham Frets: 94
    Rawk on man! This is where it's at. I had an Audi 3.0TDi (only discovered that when he passed on the mWay)) up my chuff on the twisties 2 days ago. He was all over the opposite lane on corners. So basicly, if you drive a fat torky shit box. Doin't endanger other road users. Dick.

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  • SnagsSnags Frets: 1527
    Woohoo!  I love Cadwell. Many fond childhood memories of going to British bike events there as a sprog, watching middle-aged nutters on ancient sidecars hooning around the hairpin (they used the short circuit for that) and always being conflicted about wanting the drama of an off but not the inevitable risk to life and limb that went with it.

    I think my old man even won a trophy at Cadwell once (for coming second in a class of two :) ).
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