Corky's Scimitars and other short stories

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Corky's Scimitars and other short stories

Post by philhoward » Fri Sep 25, 2020 6:38 pm

I think COPs come into their own when you have knock sensing and can dial the timing back per cylinder. In reality it doesn't make much difference for your build - it's not going to be a 600bhp drift machine. Coil packs need HT leads (obviously!) but COPs need securing properly; and likewise the plug location may sway you one way or another.

Unless there's something very funky with the stock DET ones that aftermarket ECUs can't cope with, I'd stick with them TBH unless they have a reliability issue you want to engineer out. Going R8 ones (for example) needs mountings making for sure.


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Post by Corky » Fri Sep 25, 2020 6:49 pm

I think I’m swayed towards the coil pack and HT lead solution. It’s what StewB fitted to Craig’s monster. So if it works on that, I’ve got no worries.


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Post by philhoward » Fri Sep 25, 2020 6:59 pm

Given Stews day job, I’d go with that 8)


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Post by Corky » Sat Sep 26, 2020 4:11 pm

However...... :lol:

Whilst looking for other bits, I've unearthed some CA18DET coil packs and an ECU that I didn't know I had. Must've bought them for the white SS1. This led to the eBay purchase of an ignitor module and coil pack frame, solving the ignition conundrum got me onto the issues with low impedance injectors (The OMEX requires resistors, the Haltech doesn't) ........ so I ordered a genuine Nissan resistor pack from Japan.....

In theory if I bought a MAF, I could actually run this engine with what I have, as I have a loom too. Still plan to buy an aftermarket ECU though.


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Post by Corky » Tue Sep 29, 2020 1:38 pm

I've got two tubular DET manifolds, a cracked and pretty knackered one I bought on eBay for pennies to see if I could adjust it to fit an ET, and a good one I got from Craig for the DET build. Ben C has had a couple of new flanges cut for us both, so we can flip the manifold for a top mount turbo, I have the one from Craig ready to go to Ben's TIG welding guy for this to be done. So I thought I'd use the knackered manifold for some experimentation welding stainless with MIG, and seeing if I could mock up a flipped manifold.

It's not pretty, but I think it's fully sealed and could potentially work. But you can get the idea of what we're trying to achieve with the flip (I'm sure Ben's TIG welder guy will make a much neater job of it :lol: ):-
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Steve
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Post by CNHSS1 » Tue Sep 29, 2020 9:47 pm

If it were all about looks, you wouldnt start with an SS1 Steve :lol:

Id try and brace the turbo flange to head or back to exh flange Steve, Stew did mine, i used a brace on Batmobile from rocker cover, probably more complex than Stews simple and more effective version
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Corky's Scimitars and other short stories

Post by Benc » Tue Sep 29, 2020 10:44 pm

CNHSS1 wrote:
Tue Sep 29, 2020 9:47 pm
If it were all about looks, you wouldnt start with an SS1 Steve :lol:

Id try and brace the turbo flange to head or back to exh flange Steve, Stew did mine, i used a brace on Batmobile from rocker cover, probably more complex than Stews simple and more effective version

20200704_114248.jpg
20200630_192632.jpg
20200630_192639.jpg
Those alignment tabs you have on your mani flange are a good idea that we'll steal me thinks. Along with the brace.

I'll show your picture to the welder Steve :lol:



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Post by Corky » Wed Sep 30, 2020 8:01 am

Cheers Craig. That’s a meaty brace!

The brace that was on the DET manifold on the white SS1 wasn’t as industrial as that, and it broke :roll: . So I’ll aim for something substantial like yours.

Another issue is the limited space to get a nut onto the lower stud towards the front of the engine. It’s something we’ll have to consider Ben when getting ours welded up. I’ll post a photo of the issue when I’m next in the garage.


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Post by Corky » Fri Oct 02, 2020 11:39 am

Well trying to choose an aftermarket ECU is driving me nuts. So I’ve put that to one side for now and will just concentrate on finishing the engine build, installing it and getting it running with oem electrikery. I know the last bit could be a PITA with a 30 year old loom, but the install should be pretty straight forward and I’ve got lots of spare bits of loom (and I've bought a few extra bits and pieces too). The only thing I’m missing is a MAF, so after a quick google, the obvious one to go for is a Z32 which are pretty cheap nowadays. It would also mean that I would then have everything required for a Stage 3 tune (T28, 444cc injectors, Z32) should this actually work Ok and I still can’t decide which ECU to buy. Horesham will also sell me a chip to run it with it. Having used their Stage2 chip in the DET that Josh now has, I think there’s tangible proof that it could be quite a good package and potential for 300bhp allegedly. We’ll see, I still like idea of using all new
engine management bits, but as it stands I’m just not moving forward... :w :(

Pic of what I’m planning to use (obviously needs the Cheshire touch before installation :mrgreen: )
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Last edited by Corky on Fri Oct 02, 2020 12:11 pm, edited 1 time in total.


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Post by Corky » Fri Oct 02, 2020 11:41 am

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Steve
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Post by philhoward » Fri Oct 02, 2020 12:10 pm

If you've got (or can get easily) the bits for a proven tune, TBH I'd go with that. It works, it's known and doesn't require a day on the dyno.

Otherwise you get project creep - I fitted the MX5 lump because it supposedly runs supecharged on standard management, That's not exactly true (it can, with some compromises)...so I've now got a piggy back unit (in the box), a PnP ECU (in the box...) and eyeing up overlay pulleys and bigger superchargers (which keep going in and out of online shopping baskets) and because if I up the flow, the standard management won't work, so will need to go aftermarket - and you end up continually building, and not driving/racing...

Build with the capability to improve. Maybe I should take my own advice :mrgreen:


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Post by Corky » Fri Oct 02, 2020 12:17 pm

If the wiring proves to be OK, there are other ECU options that won't require a full re-wire, such as a Nistune board or a plug and play lead and ECU from Haltech. Nistune would probably be the best bet, and the cheapest by far.


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Post by BigBobPilot » Fri Oct 02, 2020 12:33 pm

My ECU has been modded by Horsham for mapping. It's all pretty straight forward. I did have an issue with the standard ignition coils, see my project thread for that.

I sent Ben C some wiring info a couple of weeks ago. I'll forward this on to you.


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Post by Corky » Fri Oct 02, 2020 12:36 pm

Thanks Ben, that’d be much appreciated.


Steve
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Post by philhoward » Fri Oct 02, 2020 12:39 pm

I'd go with that option, If I were you, Steve.


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