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Roadrunner Sr2 Build Thread


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#21 Organ Donor

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Posted 18 November 2016 - 10:59 PM

I've found myself saying this too much recently but I can well understand staying with n/a power and almost bring myself to saying it's a wise choice. I definitely drove the westfield harder when it was on throttle bodies and had 165bhp. Now it's got 335 it takes a lot more concentration to drive fast - corners and braking zones arrive so much quicker you don't get so much a chance to think about how you'll attack the next corner.
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#22 jackembe

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Posted 19 November 2016 - 01:10 AM

Very keen to see how the engine mods go! Exactly what I'm hoping to do.

Whole thing looks great and i bet it's fun to drive!
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#23 alhendo1

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Posted 19 November 2016 - 07:34 AM

Not sure how I missed this one......that looks fantastic. ...really like the colours...excellent stuff.
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#24 na8cgee

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Posted 21 November 2016 - 03:28 PM

thank you all for your kind comments.

The reason to not go FI as originally planned was mainly due to what I want the car to do for me. When I first bought this car/awaiting its completion all I could think about was how fast I can make it 'if I go tdo4 turbo I could have a power to weight ratio of X or if I do this it could be Y' eventually after sitting down/thinking about it logically I wanted this car to be raw, a bit of drama/experience when you turn the key, fun on the limit and reliable.

To make this car as fun as possible I had to keep it relatively simple, achieve a modest power level and ensure I could beat on it as much as I wanted to without having to worry - I just don't think a turbo conversion would have given me that.

With the car having only 145bhp / 130ftlb in its current form it is still an experience with the noises/smells/low to the ground - it's doesn't need 200+ horsepower to fulfil my needs (at least not for the mean time).

Granted, I want to increase the power to around 170-180bhp as I feel this will be the sweet spot in terms of cost/reliability without changing the engine platform (would be considering a k20 engine after 180bhp to be honest).

My driving ability is ok but could definitely be improved and would improve the cars overall performance on track because I would be confident in its and my abilities. I haven't had the pleasure of driving it on the limit yet but next summer will certainly be a good shakedown for her.

So far all I have done is:

- fitted a Ctek battery charger unit (considering buying a comfort indication panel for easy charging and mounting on the dashboard)
- ordered a set of jenvey throttle bodies
- continuation of cylinder head works
- ordered a set of wilwood front brake calipers

I have had a few messages regarding my colour scheme and yes I am paying homage to the John player special cars of days gone by. I love those cars because they were extremely understated for the industry at the time but yet out performed many rivals. It is also a special colour scheme because to the majority of the public it's just another kit car but to enthusiasts like me (and all you guys on here!) instantly think of The John player special livery.

I am not planning on going to full hog with gold vinyl stripes etc although I am considering other JPS Esque visual improvements!



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Trying to achieve 220+bhp and 180+ftlb naturally aspirated


#25 Adz

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Posted 24 November 2016 - 04:02 PM

Love how this looks! Very John Player special!

Ive also considered building one of these for years and would still love to! Im not sure I can justify the price over the GBS Zero though? I cant believe how quick you've got it up and running Im pretty sure Id be on it for years! 

 


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1978 DATSUN 260Z: Full nut and bolt restoration underway, BC Coilovers, Safety Devices half cage, uprated brakes etc


#26 na8cgee

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Posted 24 November 2016 - 05:26 PM

I understand what you mean regarding the price differences between the GBS zero and the SR2. There are many differences between the two and from memory the GBS needs the driveshafts lengthening/shortening to suit the kit whereas the SR2 doesn't by improved design.

Also the front inboard suspension/tubular chassis is what did it for me - lighter & stiffer and looks the part too!

I looked at the Westfield/GBS zero/caterham/MK indy/tiger R6/SR2 when I was in the market for one last year. They all have their benefits/drawbacks, it's just a case what suits your requirements. I dare say, unless your an ex race car driver/highly skilled, all of the above cars will give you the thrills/enjoyment factor without any concern!


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Trying to achieve 220+bhp and 180+ftlb naturally aspirated


#27 na8cgee

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Posted 29 November 2016 - 07:06 PM

Managed to have a good look/test fit of a wilwood brake caliper kit I managed to purchase :)

I purchased this kit as currently my SR2 is running the standard 1.6 mx5 brakes (smallest OEM brakes available, to reduce unsprung weight)

My aim was to fit a bigger brake kit which not only provided me with better stopping power but didn't increase the weight of the brake system!

The current system weighed in at 6.5kg all in (pAds/caliper/disc/mounting brackets) :

c7b86e6f449751fdc1079fb0aa0dda56.jpg

The wilwood 4 pot caliper system weighed in at 6.475kg all in (pAds/caliper/disc/mounting brackets)

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Really impressed with how the kit came together, very intuitive and simple - happy days!

I'm glad that going up to the 270mm discs hasn't cost me any weight penalty - I could have saved weigh by going with a smaller disc (potentially even solid discs - yikes!) but decided I would rather have brake capacity in reserve for those moments when you wished you had either bigger brakes or bigger nuts :)




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Trying to achieve 220+bhp and 180+ftlb naturally aspirated


#28 Jacksheps

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Posted 30 November 2016 - 10:26 AM

Lovely work. Wilwoods have been on the list for a wile ut i just dont tend to be sat in the brakes that hard on the sort of events i do :/ but do straight line stopping power there excellent!
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#29 FreakyParts

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Posted 30 November 2016 - 03:05 PM

You should have said you were after a set of brakes... that's what we do!
Jack, last chance to order today before the price increase :o
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#30 Jacksheps

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Posted 30 November 2016 - 09:00 PM

Im in no position to be forking out for willwoods im afraid stew, just purchased a house!
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#31 na8cgee

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Posted 10 December 2016 - 05:40 PM

Well the wilwood kit I ordered has a bit of a mix up regarding the calipers because although the calipers are the same type/size/same piston size - one has aluminium pistons and the other cast stainless steel :(

Looks like I need to order another caliper!

More goodies arrived this week:

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- Jenvey throttle body kit with all required linkages/TPS/basket trumpet filters.

- Vacuum block for jenveys

- tomei fuel pressure regulator

I'm no where near ready to fit this kit but they came up for sale from the states on ebay and we'll at the price I won them at I couldn't even buy the basic jenvey kit from the UK, including shipping! Crazy, and somewhat lucky, so they will be going on the ported head once that is sorted :)

Still need to order the following for the car:

- wheel spacers (25mm-35mm front/rear)
- shortened sump (roadrunner racing)
- smaller headlights (MK sport cars website)
- 1 power lite brake caliper (with aluminium pistons)
- exhaust manifold (go custom?)

Getting exciting though!


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Trying to achieve 220+bhp and 180+ftlb naturally aspirated


#32 FreakyParts

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Posted 12 December 2016 - 09:18 AM

Where did you get the calipers from in the end? Can you not return for exchange?

If you want spacers, we can make them to suit. Thickness, PCD and Centrebore. Drop me a message and I'll sort a price for you.


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#33 na8cgee

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Posted 02 January 2017 - 04:54 PM

Happy new year everyone!

It's been a blast this Christmas period, which included a very cold drive out in the SR2!

It was -1 degrees C outside and very frosty on the roads - it was a slippery! The toyo's did really well in the conditions / considering we couldn't get any heat into them, well impressed.

I received many SR2 related presents at Christmas, let's play a game of spot the difference for the first of the 'themed' presents:

Old:

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New:

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It's a new gearknob, in burnt titanium colour - turns out it's a skunk2 lever and is very nice. I've always loved the burnt titanium look (or neo Chrome as the Americans call it).

I also got a set of lightweight wheel nuts, in the same colour scheme:

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Really impressed with these, very light!

I have also been told that I have a burnt titanium handbrake lever coming from the states which will finish things off nicely.

On the power front, the cars cylinder head has been ported/polished, I just need to finish off the combustion chambers with the polish and valve deshrouding.

Still undecided regarding cam specifications, because I have a set of NB cams, with the bigger base circle, piper can reground them to very wild specs but I'm still thinking on the lines of 264 duration, 9.5-10mm lift which around 40 degrees of overlap - more research needed!

I have started to strip down the jenvey throttle bodies to inspect/clean. My first hurdle is a 'ridge' in the TB to inlet manifold adaptor, as you can below:

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It's fairly substantial and with a sharpie I scribed the difference and this was the result:

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Pretty much consistent across all 4 runners, downside though is that to match the two together means grinding the TB itself which I don't quite fancy.

I ordered a mk2.5 1.8 bare engine with head gasket issues as I wanted the sump and potentially the high comp pistons/block - it hasn't arrived yet sadly :(
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Trying to achieve 220+bhp and 180+ftlb naturally aspirated


#34 na8cgee

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Posted 05 January 2017 - 08:21 PM

Well the handbrake handle came so that got fitted to finish off the interior/neo chrome bits:

8cac1be7d4c0207eea26ad1da7fd40e7.jpg

I also ordered some 25mm spacers for the rear of the car - these looked really nice/well made and should help the wheels look a bit less lost!

bef75613a0bea668acda39e1de3c9af5.jpg

I forgot to take pictures but they are fitted and have made a good difference - happy days!


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#35 na8cgee

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Posted 07 January 2017 - 08:37 PM

The MK2.5 engine arrived!

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After an hour or so:

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The VVT cylinder head is in great condition, mileage on this engine is unknown but it's certainly clean!

I managed to get to the bits I wanted, the block/MBSP/sump. The bores of the block are still at virgin 83mm and the honing can be still be seen!

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Hopefully I will get everything removed/bare block tomorrow and then I check the budget to see if I can afford 85mm pistons for 1.9L engine.... I wish!!


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Trying to achieve 220+bhp and 180+ftlb naturally aspirated


#36 Jacksheps

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Posted 07 January 2017 - 09:33 PM

Thats in great nick, fair play
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#37 na8cgee

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Posted 08 January 2017 - 07:11 PM

Thats in great nick, fair play

It's a lot better than I expected!

I managed to it all stripped down bare from the internals as I'm undecided at this point what I want to do with it.

The sump, pick up pipe and MBSP is ready to be sent to roadrunner for shortening/modifying so it isn't such an anchor under the car :)

fa94248da7c2aa854b0e0e3d8024de24.jpg



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Trying to achieve 220+bhp and 180+ftlb naturally aspirated


#38 na8cgee

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Posted 09 January 2017 - 09:13 PM

My new jenvey NB inlet manifold arrived today!

1cfd6ec8330790c3deaf65da5d9fe16a.jpg

And my 10mm injector port plugs:

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They fit into the head as the injectors will live nearer the ITB butterflies:

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I spent an hour or so port matching the inlet manifold to the inlet runners - didn't need much at all which is a credit to jenvey!

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Port work is still a long process but it's very enjoyable!


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Trying to achieve 220+bhp and 180+ftlb naturally aspirated


#39 Ollie_247

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Posted 12 January 2017 - 12:24 PM

wow how I never notice this I do not know.

 

As one of the test dummy for the SR2's over the years I have a proper soft spot for them mike and his guys a very skilled.

 

Great car to drive and your right you don't need loads of BHP to have fun in them they are a hoot to drive.

 

 

Keep up the good work.

 

dare I ask how much you paid for the engine ?


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#40 na8cgee

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Posted 14 January 2017 - 06:16 PM

wow how I never notice this I do not know.

As one of the test dummy for the SR2's over the years I have a proper soft spot for them mike and his guys a very skilled.

Great car to drive and your right you don't need loads of BHP to have fun in them they are a hoot to drive.


Keep up the good work.

dare I ask how much you paid for the engine ?


Thank you for the kind comments :)

The engine cost me £30 + postage.... I wasn't expecting it to be this good to be fair as I only wanted the sump!

I'm hopefully going to be doing a big update tomorrow as I have some extended wheel studs & spacers for the front wheels :)

Today I have been de-shrouding the valves in the combustion chamber, its delicate work but hopefully worth it!

8754ee84f6a5568fb0467c9b11d1886a.jpg
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Trying to achieve 220+bhp and 180+ftlb naturally aspirated





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