my 998 turbo as bulit as cheap as chips
Turbo Mini Forums

Hello all I am building a 998 turbo thought I would show it on here, I started the build earlyer this year then blew my 998, put a 1340 in the mini and was happy until a ring broke. Now board of std 998 Im starting the conversion up again.

I got given a turbo brand new IHI RFh4 turbo. I got a good friend of mine to make me up all the turbo flanges, my Dad is soldering a 10mm feed and 8mm return in my tank, I have a astra gte fuel pump which is the same pump as metro turbo, I have a metro turbo pressure regulator. My Dad is in the middle of measuring a metro tubo plenum and making me 1 up, I also have a fiesta turbo intercooler and a 306td intercooler not decided which 1 to use yet.

I am debating which head to use I can get a non skimmed 12g295 for £80 a 12g940 for £40 or a 12g202 for doing some welding, upto yet this conversion owes only time so its a tight budget. I am sending a dizzy of to ml motorsport to get it re-profiled for the engine then bob your uncle. heres some pictures Im putting turbo over clutch housing so I dont have to mod bulkhead











I am using an lcb and am going to joint the centre branch into the y piece









So this is my conversion to date I got most of this work done tonight, I made the s bend up to go on a standard cast manifold earlyer in the year Ive now modified it to go on an lcb.
I cant wait to get it done Im all excited Im hoping to run around 20psi max but mostly 10-15psi and 2-5psi for the mrs. Comments and any tips would help out.

Im also debating using the 12g940 with a de-compression plate I can get 1 made up but dont no how thick I would need I have flat top pistons and the head has 22cc dish I want to run about 8.5:1 comp ratio so I have no worrie about melt down

An interesting project, a few questions and comments though.
1. That looks like a mighty big turbo do you have the trim figures for it or even better a map?
2. If you have a plenum to measure why not use that?
3. I am not sure an LCB is the best thing to use for the manifold, there could be cracking issues.
4. The best option head wise I would say is the 12G295, much less hassel.
5. What cam are you planning on using?
6. How much is ML charging to do your dizzy, I bet for a bit more money you could get a mapped ignition system which will be infinitely more suitable. And maybe hold off the inevitable blow up for a minute or two anyway)


Ben

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

Its quite a small turbo rhf4 turbo, its just my bad photo taking
http://turbominis.co.uk/forums/index.php?p=vt&tid=228092
the maps are here I sold this turbo to just_jack earlyer in the year now I have it back as he has a metro turbo mini.
The plenum is just being borrowed so no chance of having that.
Would I be beter using the cast mini manifold.
Im going to run std cam for now but I do have a mg non turbo cam and can get hold of a phase 1 turbo cam.
ML are charging £35 to re-profile dizzy so cheap

do you not need to add in the central exhaust pipe in to the LCB bit then in to the turbo? Delfinatly go with a Mega jolts set up will be cheaper more than likly.

yes im joining it at the y piece where the 2 outers meet each other, theres enough space between them. I might go for mega jolt in the future but as I said its cost me nothing so dont want to chuck big money at it

I will be very interested in what ML do to the dizzy for £35. IMO it is a total waste of money. If you want to do it on the cheap then just weld the dizzy and set it to about 25 deg. Then save up for a megajolt system, I can't emphasise how important this is.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

what you save on a dizzy you will pay 4 times over in pistons listin to this man ^^ he realy does know hwhat he is talking about :(

there is a thread somewhere on about plenums. its not quite as straight forward as you may think as it needs to have the restrictor ring in it.
if you read the thread i'm sure you will be fine, its written by turbodave.

everyone I have spoken to about ML dizzys on n/a engines say on rolling road they have gained bhp I dont no of anybody who has had a turbo 1 off them yet. I have my Dad on the case of the restrictor measured to exact measurements

On a turbo you need to retard the ignition as the boost rises, a dizzy can't do this. Yes having a dizzy swung for a tuned engine will makes bhp gains, but not as much as having mapped ignition. Honestly for the money there is no argument.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

what kind of money would I be looking at for megajolt, if its not to expensive I will have to lock dizzy then buy megajolt at a later date.

ow and where would I get the right map for a turbo have any of you guys got saved maps that would do the trick

there is plenty of advice on maps on the site have a search around. A magajolt can cost as little as £100. All I am saying though is that ML won't be able to make a dizzy any better then just locking it (do a search) for £35. So lock your dizzy for now on your budget and then save up the extra £75 to the job right.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

Hi,
£65 Ben, the guys on a budget! lol!
Or is that £10 your comission?
Cheers,
Gavin :)

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My Mini build diary

I was being realistic, after you have the megajolt, you need the EDIS, coil pack, sensor, trigger wheel, cables, connectors etc it will be knocking on the door of a 100notes.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

i think Bat meant £35 + £75 = £110

doesnt sound that bad then. Doesnt the metro turbo dizzy retard when it comes on boost, if so I could possibly have that modded to 998 spec (its just a thought) I no I will end up with megajolt in the end it might be worth looking into tho

would it be betetr joining the centre pipe just before the turbine housing ? (yes!)

It may give beter flow into the turbo, I dont no, its alot simpler to put it in at the y piece for the outer 2 branches im going to get it on and see. Some people have said the lcb may well crack under the heat I did think this when I started it, but the lcb flows alot beter than the old cast iron mini manifold, if it cracks or doesnt make much bhp then I will have to either go down the cast manifold route or make an adaptor for a metro turbo manifold and box the bulkhead

'J' Pipe from the metro turbo manifold is your best option (no bulkhead mods needed). The setup you have WILL crack.

That turbo looks like it might be good.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Ive finally got round to welding the 3rd branch on the lcb my dad has finished the plenum theres just the fuel pressure regulator pipe to be put on, I now have my very own pressure regulator so all the bits are coming together. Im waiting for my mate jack to give me my fuel tank with the right feed and return in or a tank so I can put an 8mm return and a 10mm feed in. Im going to start plumbing up the oil feed and return this week hopefully, so progress has been made,I cant wait to get this kit in and running

i might be wrong but i thought that your return should be larger if not the same size as your feed.

most on here run 8mm for both.

the thing with the metro turbo pump is it has a 10mm feed then sends fuel to the front of the car via a 8mm. I think its so the pump gets plenty of fuel to make the pressure it needs, the metro turbo pump is also fitted to the astra gte which runs upto 5bar of fuel pressure.

The feed isn't so important.....

Making sure the return is big enough is what matters.

Usually this means making the return one size bigger than the flow.

You don't actually want HIGH pressure, you want the right pressure, the regulator can only do this if the spill off (return line) is large enough.

Schrödinger's cat - so which one am I ???

what size do you guys run From what Ive researched 8mm feed and return are usual but the pump has got 10mm on the low pressure side so I will feed the pump 10mm then run a 8mm feed to the pressure regulator