551 A race oddity

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551 A race oddity

Post by BigBobPilot » Sat Jun 01, 2019 11:17 pm

The rear tow eyes are finished. I’d done most of this before, but I hadn’t finished it off, as I needed some top-hat spacers.

The Blue Book race regs. strongly recommends two wire rope tow eyes at the front & back. This was likely to become a requirement, so I bought 4 eyes, ages ago, then puzzled how best to fit them. Folks may have spotted them poking out the back of the car in the previous photos
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At the back, the rear bumper is a long way from anything structural. Most of the hill climbers use a long fabric strap, but this wasn’t quite going to work with the wire rope tow eyes. A composite solution was going to be required.

I started off buying some used 4-point harnesses, they were the well known brand, “Made in China”.
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A new blade in the Stanley knife made short work of chopping up the harnesses. I then made up a kit of plates & spacer tubes to bolt to the chassis rear cross member. Although the cross member isn’t strong enough to tow from, I’ve used 2 straps per side to take the load back to the diff cradle / rear roll-over bar back stays.
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With it all in, it’s just a case of pulling the straps up tight.

I’ll fit some velcro loops to the bumper to hold the tow eyes tight to the body so they don’t flaps around (and look stupid) but are easily accessible for the marshals when the car needs towing.

I’ve sorted out the front too, which I initially thought was much easier, but I've then procrastinated about for ages. I’m just going to use one tow-eye, until the regs actually require two. I've painted the new metal work & it all needs to assembled & a hole cut in the front air damn, but there has been other things going on at the front too. More exciting (????) updatesto follow.


Ben

SS1 CA18DET race car
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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551 A race oddity

Post by BigBobPilot » Sat Jun 01, 2019 11:34 pm

I should say, the obvious & easy way to get strength to the back would be with some metal, but I was trying to keep the weight down.


Ben

SS1 CA18DET race car
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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551 A race oddity

Post by efi_sprintgte » Sun Jun 02, 2019 7:36 am

I’m sure I’ve seen SS1 towing hitches before... :lol:

Great work as ever, keep it up mate


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551 A race oddity

Post by Old and Slow » Sun Jun 02, 2019 4:12 pm

BigBobPilot wrote:
Sat Jun 01, 2019 11:17 pm
easily accessible for the marshals when the car needs towing
That's not going to happen, surely? 8)


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551 A race oddity

Post by BigBobPilot » Thu Jun 27, 2019 12:23 am

There’s not too much to report, the main thing done was to modify the front frame with some features to hold the rear edge of the splitter to the frame, keeping everything aligned underneath. It needed to work to allow the nose to be removed easily for service & loading on to the trailer. I had a temporary fix in place for the shake-down test, but it was just a stud fitting through a hole in the frame & was a nightmare to align.

So some large angled cow-catchers were welded to the bottom of the frame, with U-section members fitted to the back of the splitter. I removed the upper nose, so I could access everything for tacking parts in place & test fitting.
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Next it was off with the frame, so I could fully weld the new bits & any other bits I wasn’t happy with.
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It needed painting too, as it only had weld through primer on it, which isn't the most robust coating. It was to keep the rust at bay until I had welded on all the brackets I thought I needed. I sprayed the frame with epoxy primer, but stupidly managed to paint some of my workshop floor too, doh!
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Then all back together again, with all the seals & fixings finally in the intake ducting. Also removing the white protective film from some bits of the ali. sheet, which were previously highly visible through the grill
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Then rear wing off for wrapping & a bit more vinyl wrap ordered as I didn't have enough left to wrap the bonnet.
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Ben

SS1 CA18DET race car
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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551 A race oddity

Post by BigBobPilot » Wed Jul 03, 2019 12:47 am

Should have gone to Spec Savers Sunday (or dredge up things you’ve previously read on this forum)

Well, I spent most of Sunday, removing the gear lever assembly from the gearbox, whilst it’s in the car, this is really awkward & time consuming. However, it was going to be worthwhile, to fit the quick shift lever.
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On my shake-down, I’d selected 2nd to 5th more than once. Once the quick shifter was in, I remembered reading something about quick shifters on the original 1800ti (Nissan S12) gearbox (on Corky's project thread?). Hmm, selecting only 1st, 3rd & 5th doesn’t spell performance gear shifting…

Queue digging an S13 gearbox out my shed to compare the gear lever plates

Yep, the S13 box & quick shifer, has the lever about 15mm further rearwards (S13 rear, S12 front). I really should have looked at this more carefully before fitting the quick shift to the box.
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After some further checking, I think there is a solution here, but not without taking the gearbox out the car first. So the next task was to put everything back to how it was at the start of the day, what a result…

Prior to my wasteful Sunday, I’d taken the prop shaft out to change the gearbox output seal. That allowed me to put new magnets on the flange to the diff. These are for the speed pick-up for the Digi-dash. The originals hadn’t survived the rolling road, hopefully they are better attached this time.

I had to drop the rear anti-roll bar off to get the propshaft off, which allowed me to make the adjustments I wanted to do after the shake-down.

Also completed were engine oil & filter changes, plus gearbox oil top-up & coolant flush & re-fill. I’ve not been able to enter the race I wanted to on 6th /7th July, so unfortunately, it’s competitive debut has been delayed a little.

Oh, and another important task was to block off two gaps above my workshop door, to prevent a pair of amorous doves trying to make their nest inside & crapping everywhere. Fortunately this was restricted to just inside the door & they hadn’t got very far in their task.


Ben

SS1 CA18DET race car
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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551 A race oddity

Post by philhoward » Wed Jul 03, 2019 5:26 am

There have been a couple of S13 quick shifts fitted in the past - td99 went very posh and got welding to realign it in the right place (for an S12 box):
http://www.scimitarweb.co.uk/sgwrs/view ... 13#p160996

Corky used epoxy and some big washers :mrgreen:
http://www.scimitarweb.co.uk/sgwrs/view ... ft#p424207


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551 A race oddity

Post by Corky » Wed Jul 03, 2019 7:53 am

philhoward wrote:
Wed Jul 03, 2019 5:26 am
Corky used epoxy and some big washers :mrgreen:
http://www.scimitarweb.co.uk/sgwrs/view ... ft#p424207
That was 2yrs ago, and it’s still sat on the garage floor. I really must pull my finger out :lol:


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551 A race oddity

Post by BigBobPilot » Sat Jul 06, 2019 10:36 pm

There’s a bonnet under there somewhere...
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Ah, there it is!
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More little jobs done, more to do, but the list is getting shorter.

The split rims I bought for the wet tyres won't fit the front, due to caliper clearance, so I bought some alternatives, here's the rear
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Ben

SS1 CA18DET race car
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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551 A race oddity

Post by CNHSS1 » Sun Jul 07, 2019 9:04 am

Look good there Mr G, colour suits the car and wheels


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551 A race oddity

Post by MikeyBikey » Sun Jul 07, 2019 8:28 pm

agreed, like them. Reminiscent of subaru colours ?


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551 A race oddity

Post by BigBobPilot » Fri Jul 19, 2019 11:34 pm

Sorry, this a long one...

I’ve been working through a list of jobs, not really worth posting, which is surprising considering some of the things I have posted on this threaad!

I’ve entered some races in August, I await to see what I get entries for, but in the mean-time, I thought a track test was in order. The Curborough shake-down was good for sorting through niggles, but I wanted to complete a race distance (20 mins) to make sure the car behaved itself and also have some longer & faster corners to try the handling balance.

I booked in to Donnington for this morning’s (Friday 19th July) test session. On Thursday evening I was finishing off some jobs, one of which was re-filling the coolant after flushing it through. I was running the engine up to temperature to check the levels & the engine started to fluff when it was idling. I thought it might have sooted a spark plug and didn’t worry too much. I loaded the car up ready for the morning & planned to change the plugs before heading out on track.

The morning group had 2x half hour sessions; I was there early enough to get the plugs changed, with that done, I fired the engine up & it was running smoothly again. So I thought I was all ready to go. Iain Daniels arrived splendidly in his Sabre 4, he’d offered to come & help out & observe for feedback. Despite the terrible weather forecast, it was dry & I headed out, but the engine started missing almost straight away. Here’s the out-lap, I wasn’t really pushing & it wasn’t happy. I did 3 or 4 laps & came back in as it was getting worse, definitely not clearing. Since Curborough, I’ve bought new cage mounts for the GoPro camera, so the viewing angle is somewhat improved.



After coming in, we ran through checking the misfire, no. 2 was running cold (checking the exhaust manifold temps). When we pulled the plugs out, no. 2 was wet with fuel, & the top of the piston had fuel on the crown. After swapping the coils (it has individual coils on plug) the problem stayed at no. 2, so the coil was ok. We looked at all the connectors at the engine & transistor pack input & output (disconnected inspected, jiggled around & re-connected). There was nothing obviously wrong, but it was all running ok when re-connected.

The weather forecast remained grim, a bacon & egg bap & coffee did not seem to improve the forecast either. I was holding off on changing the tyres though (I’m running slick tyres). However, it started raining heavily about 5 minutes before my 2nd session started. Ensue the tyre change, not quite as quick as F1, so I was about 5 mins late heading out for my ½ hour 2nd session. Many thanks to Iain for his help getting me out on track without loosing too much time.

Here’s the in-car, I’ve put in the first flying lap & the last lap for a good comparison. The screen was misting up from the end of the 1st flying lap. I’d got my race-suit wet when changing tyres, that just starts steaming in a hot car, plus there was water leaking in at the hardtop joint at the top of the screen. On top of that, I’d not sorted out any ventilation, as it was way down the list of getting the car running. I was going to go for a polycarbonate windscreen, but it may yet be a heated windscreeen... The visibility was good initially, but make your own mind up for the last lap, spot the Noble coming past at 3:17; I was going to see if I could stay with him on the straight, but I couldn’t see the car at all through the spray, so decided against that. Fortunatley, there were only a handful of cars out there, but in a race, I need better visibility.



The engine gave a few coughs during the 2nd session, but otherwise pulled through the revs ok, so I need to check through the coil wiring to try and find where the issue is. It had all run fine until now, so it’s odd that it decided to have a hiccough, but that’s what testing is for. The obsevant will have noticed a noise on a couple of the corners, I think there is some tyre rubbing that wasn't there with the slicks, yet to be investigated.

I’d rather it had been dry, but it was useful to run in the wet. The wet weather handling was nicely balanced, I ran the engine on full boost rather than the “wet / low boost” setting. It was all ok with throttle modulation, power-on over-steer could be provoked, but there were no nasty spikes in power /torque, so a gradual throttle feed in was ok. I was pleasantly surprised by the level of grip with the wet tyres too. It bodes well for the balance in the dry (I did have a handling tweak between sessions).

Here’s the car after the 2nd session, note the steamy windows!
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All with the Sabre 4 in the back ground.


Ben

SS1 CA18DET race car
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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551 A race oddity

Post by BigBobPilot » Fri Jul 19, 2019 11:45 pm

Here's some photos from Thursday as an update to the previous ones, where it was a bit more multi-coloured
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Ben

SS1 CA18DET race car
Latest owner of V6 coupe SRE 353G
SSSC Champion 2009, driving "Big Bob"
CSCC "Swinging 60s" race series winner in 2011, 2014 & 2015 (Group 2) sharing a Marcos with Iain Daniels

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551 A race oddity

Post by efi_sprintgte » Sat Jul 20, 2019 7:09 am

I really thought that was going to read “miss fire didn’t clear and the head gasket blew” or something to that effect.

Looks awesome mate


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551 A race oddity

Post by philhoward » Sat Jul 20, 2019 7:22 am

Not the self-failing Nissan loom syndrome again?


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