SS1 Racer - C686CCR

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philhoward
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Post by philhoward » Sun May 31, 2020 8:26 pm

That’s why sometimes I spend too much time thinking - I suspected that 7psi at low rpm isn’t going to cause much of an issue.

I will probably be fitting the ”frig box” as Craig so eloquently puts it at some point so I can back the timing off by a few degrees easily enough but might just dial it back for now; apparently changing the base timing from 10 degrees BTDC to 8 degrees should be enough to stop it rattling or popping a rod. I’ve got a set of slightly beefier injectors if needed but I need to remember half the reason going for this engine was it can run supercharger on stock management- or so I’m lead to believe.


Phil Howard
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SS1 1600 Rooster Turbo; Sabre Mk1.5, Sabre Mk2
SS1 Racer
Previous: SE5/5a/SS1 No.1/SS1 Rooster/SS1 1800Ti/SE5a 24 Valve
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Post by CNHSS1 » Sun May 31, 2020 8:47 pm

Apologies M'Lud, should have used the just as accurate but more pc term 'half assed bodge box that isnt fit to lace the boots of an aftermarket ecu' :lol: :lol: :lol: :lol:


Racing is life, everything before and after, is just waiting--Steve McQueen
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RIP Batmobile, await the Rise of Dark Knight 8)
Sabre 'Light Sabre' 360hp!!
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SS1-C686CCR

Post by efi_sprintgte » Sun May 31, 2020 8:59 pm

philhoward wrote:
Sun May 31, 2020 8:26 pm
That’s why sometimes I spend too much time thinking - I suspected that 7psi at low rpm isn’t going to cause much of an issue.

I will probably be fitting the ”frig box” as Craig so eloquently puts it at some point so I can back the timing off by a few degrees easily enough but might just dial it back for now; apparently changing the base timing from 10 degrees BTDC to 8 degrees should be enough to stop it rattling or popping a rod. I’ve got a set of slightly beefier injectors if needed but I need to remember half the reason going for this engine was it can run supercharger on stock management- or so I’m lead to believe.
Watch EGTs if retarding timing, I would rather trim the boost out.


JC

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CNHSS1
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Post by CNHSS1 » Sun May 31, 2020 10:44 pm

If you have enough injector capacity, you can add fuel at WOT to act as a cylinder coolant and help to drop EGTs. You can add a reasonable amount of fuel before it drops power and long before it washes the bores, on a turbo motor its good housekeeping in fact


Racing is life, everything before and after, is just waiting--Steve McQueen
6 time Class Champ, 2006 & 2014 SSSC Champion

RIP Batmobile, await the Rise of Dark Knight 8)
Sabre 'Light Sabre' 360hp!!
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Benc
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SS1-C686CCR

Post by Benc » Fri Jun 12, 2020 4:21 pm

Interesting line Mr Howard

https://www.barcyorkshire.co.uk/gallery/594

10 ish pics after the bikes



efi_sprintgte
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Post by efi_sprintgte » Fri Jun 12, 2020 4:38 pm

20F2B8F4-B176-4998-9EDA-BDC9393CD9B8.jpeg
20F2B8F4-B176-4998-9EDA-BDC9393CD9B8.jpeg (318.58 KiB) Viewed 912 times
Was it rallycross.. :lol:


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philhoward
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Post by philhoward » Fri Jun 12, 2020 4:43 pm

My “Flymo” moment.

Sub-optimal I call it :lol:


Phil Howard
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SS1 1600 Rooster Turbo; Sabre Mk1.5, Sabre Mk2
SS1 Racer
Previous: SE5/5a/SS1 No.1/SS1 Rooster/SS1 1800Ti/SE5a 24 Valve
http://www.ss1turbo.com
Never try and argue with an idiot. They drag you down to their level, then beat you based on experience.

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SS1-C686CCR

Post by Corky » Fri Jun 12, 2020 5:45 pm

Benc wrote:
Fri Jun 12, 2020 4:21 pm
Interesting line Mr Howard

https://www.barcyorkshire.co.uk/gallery/594

10 ish pics after the bikes
I'm saying nothing :lol:


Steve
Current:- SS1 Ti RG sprint car, Honda S2000, VW Touareg 3.0 V6
Prev:- Sabre Ti, 3xSS1 Ti, SS1 16v Turbo Racer, 5XGTC, 2XSE6B, 2XSE5A, 2XV6 Coupe, Sabre 6
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Post by philhoward » Fri Jun 12, 2020 6:47 pm

Anyway - going back to the boost (bypass valve) control it seems I have very much been over-thinking it as I've been conversing with a guy on FB with the same Merc-based supercharger who literally has a switch on the throttle and when he's at around 25% throttle closes the bypass valve (powered by a cheap eBay PWM controller) and it works fine. His issue is that it doesn't go on to full bypass quick enough on closing the throttle, so engine braking takes a few seconds to kick in... I won't have that issue thanks to the H-bridge driver and position control I'm using (it will open as quick as the main throttle can close), but will be able to make it simply on/off at a certain throttle and rpm and be damned..


Phil Howard
Scimitarweb Forum Admin
SS1 1600 Rooster Turbo; Sabre Mk1.5, Sabre Mk2
SS1 Racer
Previous: SE5/5a/SS1 No.1/SS1 Rooster/SS1 1800Ti/SE5a 24 Valve
http://www.ss1turbo.com
Never try and argue with an idiot. They drag you down to their level, then beat you based on experience.

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Post by philhoward » Sun Jul 12, 2020 8:21 am

Keep chopping away at it. That’s the plan. Curborough in 5 weeks so better get a lick on :shock:

Find some dirt cheap 13x6 alloys in BMW E21 fitment - locate some R888s - all good. Should have done a test fit first as I now need longer studs :evil:
7CCFE691-5D88-40C6-AEFF-EC3C086348F9.jpeg
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At least they clear the callipers without spacers which is good. Searched back through and there’s a consensus on some from Burton Power: https://www.burtonpower.com/grayston-wh ... 215os.html - still valid? Don’t want to do a Steve Oakes, get some cheaper ones off eBay then have to get the Burton ones anyway (yes, there was plenty of discussion on a Steve Oakes thread :mrgreen: ).

Figured a programmable ECU might be useful - Speeduino plug and play, £240, job done.
0CF3EB86-43CE-4D09-8FAE-F0B72A5131A1.jpeg
0CF3EB86-43CE-4D09-8FAE-F0B72A5131A1.jpeg (177.74 KiB) Viewed 626 times
Not saying I’m going to fit it yet..And plug and play means it comes with the same plugs, of course.

Bit of floor surgery to clear the exhaust (and so I can get to the chassis to weld some feet in for the cage):
C7B58FF8-562E-4CC8-9B07-5D122116FF5D.jpeg
C7B58FF8-562E-4CC8-9B07-5D122116FF5D.jpeg (390.89 KiB) Viewed 626 times
Need to fill that hole in at some point. Decided to go back to the Ti exhaust instead of the side exit for now.


Phil Howard
Scimitarweb Forum Admin
SS1 1600 Rooster Turbo; Sabre Mk1.5, Sabre Mk2
SS1 Racer
Previous: SE5/5a/SS1 No.1/SS1 Rooster/SS1 1800Ti/SE5a 24 Valve
http://www.ss1turbo.com
Never try and argue with an idiot. They drag you down to their level, then beat you based on experience.

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Corky
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SS1 Racer - C686CCR

Post by Corky » Sun Jul 12, 2020 8:30 am

Is that a MAP sensor built into the ECU? Just for ignition or fuel too?


Steve
Current:- SS1 Ti RG sprint car, Honda S2000, VW Touareg 3.0 V6
Prev:- Sabre Ti, 3xSS1 Ti, SS1 16v Turbo Racer, 5XGTC, 2XSE6B, 2XSE5A, 2XV6 Coupe, Sabre 6
Project Threads & YouTube

“It's not the winning, it's the taking apart that counts"

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philhoward
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SS1 Racer - C686CCR

Post by philhoward » Sun Jul 12, 2020 8:41 am

For everything and yes, a Map sensor built in. Can even decode the cam sensor off an MX5 engine but is equally happy with a 36-1 wheel: https://diy-efi.co.uk/product-category/speeduino


Phil Howard
Scimitarweb Forum Admin
SS1 1600 Rooster Turbo; Sabre Mk1.5, Sabre Mk2
SS1 Racer
Previous: SE5/5a/SS1 No.1/SS1 Rooster/SS1 1800Ti/SE5a 24 Valve
http://www.ss1turbo.com
Never try and argue with an idiot. They drag you down to their level, then beat you based on experience.

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Corky
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SS1 Racer - C686CCR

Post by Corky » Sun Jul 12, 2020 8:41 am

Just looked at the Speeduino website. Nice and cheap option for MX5 engines. I can see why you went for it 8)


Steve
Current:- SS1 Ti RG sprint car, Honda S2000, VW Touareg 3.0 V6
Prev:- Sabre Ti, 3xSS1 Ti, SS1 16v Turbo Racer, 5XGTC, 2XSE6B, 2XSE5A, 2XV6 Coupe, Sabre 6
Project Threads & YouTube

“It's not the winning, it's the taking apart that counts"

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Corky
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SS1 Racer - C686CCR

Post by Corky » Sun Jul 12, 2020 8:46 am

Stacked up against the usual suspects, that is amazing value.


Steve
Current:- SS1 Ti RG sprint car, Honda S2000, VW Touareg 3.0 V6
Prev:- Sabre Ti, 3xSS1 Ti, SS1 16v Turbo Racer, 5XGTC, 2XSE6B, 2XSE5A, 2XV6 Coupe, Sabre 6
Project Threads & YouTube

“It's not the winning, it's the taking apart that counts"

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philhoward
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SS1 Racer - C686CCR

Post by philhoward » Sun Jul 12, 2020 8:49 am

Somewhere between an ME221 and a 442 - but less than half the price. Same principles, similar code, same programming software (Tunerstudio), just a different processor.


Phil Howard
Scimitarweb Forum Admin
SS1 1600 Rooster Turbo; Sabre Mk1.5, Sabre Mk2
SS1 Racer
Previous: SE5/5a/SS1 No.1/SS1 Rooster/SS1 1800Ti/SE5a 24 Valve
http://www.ss1turbo.com
Never try and argue with an idiot. They drag you down to their level, then beat you based on experience.

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