Ti Distributor disc

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frase29
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Post by frase29 » Fri Feb 09, 2018 7:47 pm

oops -gtcse8 your reply came in while i was typing that last one! I'm looking at just replacing the disc, at the minute I'm using a megasquirt ECU triggered off the standard eye/disc. I'd be keeping the standard eye, which certainly works with a lot of aftermarket discs, so no reason it wouldn't work with mine! Dizzy itself wouldn't be modified, so to swap back to the standard ECU all I'd need to do is plug it back in and swap over the disc (not the quickest option but still very doable...)

Let me know what price your eyes are - mine isn't giving any trouble at the minute but certainly seems a good idea to have a spare, what with their reputation...


'87 SS1 1800ti: LSD, Megasquirt, EBC, Launch Control (oh and a decent stereo ;) )

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Post by CNHSS1 » Fri Feb 09, 2018 7:50 pm

frase29 wrote:
Fri Feb 09, 2018 7:43 pm
COP is less of a want - more the sequential injection. Should allow me to squeeze a little bit more out of the stock injectors at the top end (for each injector there would be less squirts per engine cycle so less lost deadtime - yes i know i should really get new injectors, but really would like to keep it swappable back to the standard ECU!). That said if I'm ever running wild boost it may be nice to go COP for a more powerful coil per plug, maybe letting me keep gaps larger and not get spark blowout...

Also i do like the idea of trying to make it more economical - once i finally get it prepped for sprinting I've no means of towing so any economy gain is more money for making it faster (or, more likely, fixing it :oops: )

Not yet had trouble with my dizzy electronics, either on stock ECU or Megasquirt, but am aware it can be troublesome - if it ever dies that'll probably be the time i install a 36-1 crank wheel and gut the dizzy to give a cam input, or maybe just get a DET? (a boy can dream :lol: )
Don't push your luck with barely right size injectors, do the job right. Set of std 444cc from a skyline will set you back 80-120 quid and 510cc or 550cc from an Evo (depending on year) will fuel to beyond capabilities of rest of setup. Note evo need the fuel rail drilling out to 11mm iirc, skyline are direct fit.

Lean runs in the blink of an eye will cause rods and pistons to pop out of odd places--not worth the risk. Changing from batch to sequential is a nice idea but not for the reasons given imho

If you want a redneck tweak to up capacity or injectors, raise baseline pressure and remap accordingly. Std Nissan baseline is slightly low, probably even lower on a 25yr old regulator, so a new adjustable one set to the higher end of the parameter will see more fuelling safely


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RIP Batmobile, await the Rise of Dark Knight 8)
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Post by CNHSS1 » Fri Feb 09, 2018 7:53 pm

More power and good economy? You'll need two maps.

On Batmobile I ran 216hp, 250ish (can't remember exactky) and 282hp maps on the emerald as it has 3 map switching.
Also had a 212hp MOT map from which perfume and goodness came out of the exhaust! From when our race regs needed an mot for the old Supermod regs. Wouldn't drive above 2,500rpm but kept the test station happy


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Post by frase29 » Fri Feb 09, 2018 7:55 pm

Completely agree - I'm basing the 'just enough' off around 80% duty cycle, so there's more to give but not much - from so back of the envelope maths i could gain maybe 10% going to sequential, which could still be 1psi worth of boost!

Trouble I've found is getting hold of the right type of injectors - the hose-tail type used on the ET engine seem very rare - only ones I've found that are a decent step up are from a Merc 450SEL or pre-HE Jag XJS, which I've barely ever seen for sale, and for a LOT of money if found... Custom fuel rail certainly seems the answer but limited by cost...

Will look into an adjustable fuel pressure when i replace the fuel lines (AKA - very soon!)

Multiple maps no problem with the Megasquirt :wink:


'87 SS1 1800ti: LSD, Megasquirt, EBC, Launch Control (oh and a decent stereo ;) )

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Post by CNHSS1 » Fri Feb 09, 2018 8:43 pm

Skyline r32 are direct fit, had them on Batmobile, simples


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Post by CNHSS1 » Fri Feb 09, 2018 8:53 pm

Wasnt suggesting multiple was difficult with mega squirt, just a rip snorting map won't give economy.
To get economy you will need to limit boost too 6-7psi I'd suggest or booting it to overtake will ruin your economy.

You will need some form of boost control too to getbthe best from the setup. Modulating boost makes a massive difference, enablingbthe boost spikes to be removed along the torque curve. For road use you can always limit boost other than above 90% throttle angle meaning you still get power for over taking but only when intended, will keep the fuel usage down. Emerald use a VAG boost solenoid as it can flow a lot allowing a bigger variance from wastegate spring pressure to bleed off pressure but most oem solenoid will work.

For track work you want to 'waste ' fuel. On the Dyno you will get max power but will be able to add fuelling, 2%- 5% extra to use as cylinder cooling without losing power. The benefits of adding a little fuel over what a required it's the EGTs (exhaust gas temperature) stay sensible. At WOT you could drop the EGT by 150-200 degrees! :shock: which gives you a safety margin. Often mapping in a Dyno cell you will need to add a safety margin to allow for the non perfect track conditions (heat soak into IC pipework, red flagged etc)


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Post by frase29 » Sat Feb 10, 2018 1:31 pm

CNHSS1 wrote:
Fri Feb 09, 2018 8:43 pm
Skyline r32 are direct fit, had them on Batmobile, simples
Really?! That would be game changing... correct me if I'm wrong here but looks like they're the o-ring type at the fuel rail end, rather than the hose-barb of the standard Ti, or is it a case of being just the right size so with a hose clamp they'll be okay?

I'm not too concerned about economy going downhill when i boot it, i'd have though/hoped :lol: that i could offset that by having it that bit more economical on long motorway cruises, which the car does do a fair number of...

I've already got the megasquirt controlling boost (my project thread is in dire need of updating - my bad D:), with one of the little blue MAC solenoids, cheap as chips and actually works really well! Yet to go for anything above 11psi (set to hold 10 but spikes a tiny bit, still needs some tuning) so will see how well it works once I've got an intercooler and bigger boost, will bear the VAG one in mind..


'87 SS1 1800ti: LSD, Megasquirt, EBC, Launch Control (oh and a decent stereo ;) )

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Post by CNHSS1 » Sat Feb 10, 2018 2:54 pm

Yeah just add hose to r32, very well trodden path on small Scims and s12s


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Post by frase29 » Sat Feb 10, 2018 8:40 pm

Fantastic - will be keeping an eye out for a cheap set of them for sure!

Still would like to try making a modded trigger wheel, so if anyone's got one to sell/lend/measure for me I'm still searching!


'87 SS1 1800ti: LSD, Megasquirt, EBC, Launch Control (oh and a decent stereo ;) )

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Post by scimjim » Mon Feb 12, 2018 5:40 pm

Okay - got the spare dizzy out but I can’t strip it down to the disc (not prepared to risk damaging my spare piece of rocking horse poo :shock: ) so some measurements and an overhead shot that you might be able to scale up?

All measurements are very approx I’m afraid

1 (disc dia) 50mm
1-6 (distance from edge to outer slots) 2mm
6-5 (outer slot length) 1.5mm
3-4 (inner slot length) 2mm. Larger slot is 1.5mm x 2.5mm and is orientated 90 degrees out from your drawing.

Maybe someone has a u/s dizzy they can get the disc out of?
AF43DFD1-465F-4EC9-BCFA-109158B49F50.jpeg
AF43DFD1-465F-4EC9-BCFA-109158B49F50.jpeg (229.84 KiB) Viewed 155 times


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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Post by frase29 » Thu Feb 15, 2018 2:06 am

Fantastic thanks! Missed this post, teach me to not put notifications on for my thread :oops:
Approx is okay - the main thing I'd like is to be able to get a disc cut to test this term, then I can test fit it and work out alterations over the easter break, with an aim to have a successful disc made by summer.

Picture will be very useful too - interesting that you found the larger slot being 90° out from the picture - working from the picture on page 6 of Jim Russell's PDF here: viewtopic.php?f=4&t=20398, it shows the slot aligned as per mine? Do hope there aren't different variants on our various cars :w

Not sure if it can be worked out without further disassembly (no worries if not!) but are the locating holes and the flat edge of the centre hole aligned as per my drawing, and the picture in the PDF?


'87 SS1 1800ti: LSD, Megasquirt, EBC, Launch Control (oh and a decent stereo ;) )

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Post by scimjim » Thu Feb 15, 2018 8:00 am

frase29 wrote:
Thu Feb 15, 2018 2:06 am
interesting that you found the larger slot being 90° out from the picture - working from the picture on page 6 of Jim Russell's PDF here: viewtopic.php?f=4&t=20398, it shows the slot aligned as per mine?
My pic above and the one in the pdf show longer edge to the outside, your dimension drawing has shorter edge out.
2E10CCA9-8952-4174-97E1-F3B0C474C0AC.jpeg
2E10CCA9-8952-4174-97E1-F3B0C474C0AC.jpeg (198.9 KiB) Viewed 109 times
Can’t see the centre hole but the two small locating holes are in the right place


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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Post by frase29 » Thu Feb 15, 2018 11:16 am

Ah okay i see what you mean, thanks - presumably everything is in spec as per the other photos i found - should be able to dimension a disc pretty close from that. :D

P.S. if anyone does happen to have a dead dizzy (or even a slightly bent and unusable disc!) let me know :)


'87 SS1 1800ti: LSD, Megasquirt, EBC, Launch Control (oh and a decent stereo ;) )

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Post by gtcse8 » Thu Feb 15, 2018 2:05 pm

Hi frase

I will be stripping down the spare dizzy I bought from Paul Mad very soon for refurbishing.
I could "Loan" you the disc if you still need one?.

I have also looked at costing the replacement CAS I had reman and they come to £60 plus post.
I will include fitting and testing instructions along with the unit.
Mark


See the Beast on youtube under" RELIANT SCIMITAR CONVERSION LOL.,Se5,Se5a, Se6a, Two Se6b`s, GTC, SST 1800Ti & not a lot of sense

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Post by frase29 » Mon Feb 19, 2018 12:06 am

PM'd :)


'87 SS1 1800ti: LSD, Megasquirt, EBC, Launch Control (oh and a decent stereo ;) )

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