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Old 31-08-2014, 06:03 PM   #1
PaulW
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Default Project Stella MX

I suppose i had better explain what i'm up to and start another build diary

To be honest i'm bored
We lost the best bang for bucks sprinting, Barkston Heath
No racing for me next year i don't think

So what do i do over winter.........build another racer

The plan is a front engined RWD using an 1.8 MX5 (thanks Bill) Its going to be turbo'd as I've never even had a turbo'd road car, well except my T4 van that is. So its going to be a learn on the job as well. Looking for about 250 usable BHP.

Full space frame build as well, i'm keeping the shell from Stella for sentimental reasons and to keep Andy_S happy

That's it for the minute i had better start stripping the old Stella down and get the parts I've sold sorted.

Paul
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Old 01-09-2014, 06:29 AM   #2
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Old 01-09-2014, 07:59 AM   #3
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Cant wait... : )
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Old 01-09-2014, 05:13 PM   #4
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I would like to do a bit of research into this turbo malarkey and was recommend Forced Induction Performance Tuning A. Graham Bell. Its no longer in production and is silly money on eBay.

Any recommendations?

Paul
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Old 01-09-2014, 06:46 PM   #5
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You mean this one Paul? Send me your address and I'll chuck it in the post. Call it a long term loan.

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seat mounting should not be taken lightly, nor should a rat trying to get up your trouser leg doing 50,m,p,h, all of a suden your nUts become more important,
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Old 01-09-2014, 06:51 PM   #6
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That's fantastic Andy thank you.

Paul
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Old 01-09-2014, 07:56 PM   #7
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Send me your address and I'll chuck it in the post. Call it a long term loan.
If you ebay the book you'll be able to buy yourself a disco-potato with the proceeds
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Old 01-09-2014, 08:02 PM   #8
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If its turbo charging for an MX5 you want, this may be of interest to you.



You can contact turbo yoda (alan) via the MCM forum or via their website, AM autos.
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Old 01-09-2014, 08:08 PM   #9
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...and is silly money on eBay.


I've seen some expensive books, but that's fcking insane.
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Fuck me Shaun. That actually made sense.
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Old 01-09-2014, 08:16 PM   #10
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If you ebay the book you'll be able to buy yourself a disco-potato with the proceeds
Nah. Need something bigger than that to burn the paint of my bonnet.
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Old 02-09-2014, 03:03 PM   #11
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Bloody hell, and I'm sure I have two copies.

Four stroke performance tuning by the same author will also help. A good one to have on the shelf.

The hardest and most important part will be choosing your turbo, get that right and you'll have your drivability. The book covers compressor maps, and these are often available on the internet for OEM units, so just check you'll be operating in an efficient area and you're not going to surge. Hot side is just as important.

Invest in management with boost control, MBE 9A4 or DTA S60 (and 40?) has this, and then run a 3 port solenoid if you can.

Then keep the compression up on your base engine.

I think owens have some good stuff on their website regarding turbo selection. Might help you out and give you something to read whilst that books in the post from andy!
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Old 02-09-2014, 04:37 PM   #12
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Originally Posted by alexcrosse View Post
Bloody hell, and I'm sure I have two copies.

Four stroke performance tuning by the same author will also help. A good one to have on the shelf.

The hardest and most important part will be choosing your turbo, get that right and you'll have your drivability. The book covers compressor maps, and these are often available on the internet for OEM units, so just check you'll be operating in an efficient area and you're not going to surge. Hot side is just as important.

Invest in management with boost control, MBE 9A4 or DTA S60 (and 40?) has this, and then run a 3 port solenoid if you can.

Then keep the compression up on your base engine.

I think owens have some good stuff on their website regarding turbo selection. Might help you out and give you something to read whilst that books in the post from andy!
I love this post it covers all my concerns about forced induction

The choice of turbo worries me a bit.......never had this dilemma before. Making sure i get the one that is right for what i want the car to do.

I'm selling my DTA S40 and going with http://www.extraefi.co.uk/MX5.html

I'll have a look at the Owens website tonight. Cheers for this post Alex it was helpful.

Paul
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Old 02-09-2014, 06:05 PM   #13
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Originally Posted by PaulW View Post
I'm selling my DTA S40 and going with http://www.extraefi.co.uk/MX5.html
The early Megasquirt only works with either MAP or TPS whereas the later ones will work part TPS & then part MAP.

Not sure if the clever guys agree but in my understanding this makes it easier to program the bottom end of revs at part throttle as otherwise you need very good MAP resolution in the region before your MAP sensor sees boost.

This is a particular problem if you run ITB's instead of a large plenum with single butterfly.

.............. stands back and waits to be shot down in flames ......
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Old 02-09-2014, 07:11 PM   #14
PaulW
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Quote:
Originally Posted by Andy_S View Post
The early Megasquirt only works with either MAP or TPS whereas the later ones will work part TPS & then part MAP.

Not sure if the clever guys agree but in my understanding this makes it easier to program the bottom end of revs at part throttle as otherwise you need very good MAP resolution in the region before your MAP sensor sees boost.

This is a particular problem if you run ITB's instead of a large plenum with single butterfly.

.............. stands back and waits to be shot down in flames ......
So in layman's terms is the PnP megasquirt any good?
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Old 02-09-2014, 07:28 PM   #15
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So in layman's terms is the PnP megasquirt any good?
Dunno

I think Allan McD runs the one that covers all the bases.
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