A little guidence for this winters project, please.
Turbo Mini Forums

After posting this topic http://www.turbominis.co.uk/forums/index.php?p=vt&tid=152678 I have given serious thought to turboing my 998, im not after big bhp, I just want a little more than what I have, thinking of around 8psi boost, my engine spec is,
998 cc, metro turbo head (ported and polished, unleaded), maniflow inlet matched to head and twin carbs. cooper freeflow & stainless rc40. sw5 cam, cr 10.5;1 (using flat top slipper pistons), lightened and balenced bottom end, vernier adjustable timing gear. Aldon yellow dizzy. lightend flywheel. close ratio box with centre oil pick up. Produces a very torqey 65 bananas.

Other than a few mods to the gear box, ie 4pin diff and straight cut drops, what other areas do I need to adjust, I have read the 295 head is better (I have a good one stashed in the shed) but am a little worried that my block has the clearence pockets in for a 12g295 head, will this cause hot spots? Is the sw5 cam ok to keep, and will the dizzy be any good?
Many thanks in advance.
Shane.

Keep the head and have the chambers enlarged to reduce the CR to 9:1. (see Benross)

Keep the cam.

Bin the dizzy.

8psi should net 80 to 90 bhp (maybe more!)

Don't forget an intercooler.

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

www.twin-turbo.co.uk

Cheers for that will, will 9:1 cr give good road manners off boost? The next big question is. T2 T25 or T3, my thoughts are T2 and stick the T25 on the 1275. I wasnt planning on fitting an I/C as I wanted to keep the engine bay tidy and stealthy, is 8psi to high to run without one? I have a suspision that I know your answer is going to be already, but what do I do about a dizzy? (this is where you scream back to me, MEGAJOLT)
Thanks again will,appreciate it.
Shane.

Hi,
I'd go T2. 9:1 will give you good road manners. As for IC you could try it and see. If you fit MJ (I would with high CR) I think I'm right in saying you could fit an air temp sensor in the plenum and use this to monitor intake temps and retard the timing if it goes to high. Then you'l know if you need an IC
Cheers,
Gavin :)

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Megajolt is the best answer really. You could just fix the dizzy at say 24deg, and it'll be safe but you'll lose driveability and economy. Metro Turbo is dizzy is the only other option.

8psi on an R5 GT T2 is pretty good for the 998 (it's what I'm using on my road 998, when I get my mirage manifold)

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

www.twin-turbo.co.uk

I wasnt going to use mj on this, was thinking of using a dizzy, (I have a metty one somewhere) would I be at a huge disadvantage by using one? If im going to the hassle of doing this I wanna do it properly, but would like to keep the stock look engine bay, but i do have this spare at the moment!
Cheers.
Shane.

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Hi,
Sell that and get an Escort RST S2.
The Escy one will be easier to fit in, and I doubt you'll need anything that big for 8psi....
As Will said you'll loose drivabilty and economy, essential items for a road car.
Fitting MJ would go with your "do it properly" take on things.
Cheers,
Gavin :)

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May keep the cooler for the minus, I appreciate what your saying bat, again im trying to avoid an over crowded engine bay, and not sure where to hide the ecu.
The other thought I am having today is possibly the v max eaton charger kit, anyone used one on a 998 before? How would this work with my engine spec, what is the ideal Cr for a supercharger?
Cheers
Shane.

Hi,
Best place for any ECU is in the car, say under the passenger side of the dash. It shouldn't get wet there!
Cheers,
Gavin :)

Edited by Bat on 26th May, 2007.

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Fair comment, thats probably the only place i have left to hide anything lol! Going back to Ic's and you saying I wouldnt need anything too big for 8psi, does that mean my pipework id can be smaller? is 1"3/8 id too small? Im now torn between a turbo or a supercharger, lol too many choices!!!
Shane.

Edited by shane on 26th May, 2007.

Hi,
Pipework size is sometihng I'm not too sure on myself. I would say the same size as the turbo outlet would be right, whatever that is?
Cheers,
Gavin :)

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I think its in the region of 1"1/2 on the metro setup, Im pretty sure that is the size of the inlet into the plenum, gussing the air outlet of the turbo is the same, but the r5 t2 has a bigger outlet (I think). If im correct in the size of the metro assy, the stuff I have to use is an 1/8 less in diameter will I loose much flow, will the velocity will be higher, will this in turn give a little more tourque?
Cheers
Shane.

Anyone any thought re 1 3/8" IC pipework?
Shane

40mm is about the ideal IC pipework size

Ok,

I have had some thoughts about 998 turbos before along the lines of would a HIF44 or Hif38 be best.

If you are using a 44 then chances are your using the metro plenum and the 37mm restrictor ring. Although I have not tried this I suspect that if you go below the 37mm of the restrictor ring it would affect its function, anyone?

as a 998 will not need the air flow or a 1275 you could go to aHIF 38 and a corespondingly smaller restrictor (84% of the carb size) or a tad under 32mm of course this is an unknown...

The proble with going HIF38 is that they don't come in a turbo version so it is a bit of a pain. The 44 is fine on a 998 turbo though.

The problem with small IC piping is that at some point you will probably end up going up a size to fit the IC inand then down a size if you want the smaller pipes. Best thing is to get an intercooler, mount it and then make a decision on pipe routes and sizes.

http://www.twin-turbo.co.uk
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Thats what im now in the process of doing, I have a cooler which the take offs are 2 1/4", im using a T2 which the air outlet id is 1 1/2", 2" od, and using the metro plenum, so I have a mish mash of sizes. Who on here makes the plenum with left hand pipe take offs?? have seen the pics and believe it would make my life soooo much easier! lol.
Cheer for the help.
Shane.

Hi,
Nics mate makes the stainless plenums.
Cheers,
Gavin :)

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Is it a 2" outlet on them? are they available without DV fitment, and with the std tyoe blow off valve for overboost?
Cheers
Shane.

shaneyboy .... why would you not want to run a dump valve??? Not running a DV with any reasonable boost level and you'll be getting turbo stall ..... or turbo death in laymans terms!!

Every day is a school day ...........

How fast and how expensive ...... the same question...

nic's mate could make what you want but the std overboost valve would be a hard thing to put in.

the std one from nic has a 2"/50mm outlet on the left and a 1"/25mm on the right for the DV.

I'm using them and it makes life very easy!

Turbo stall and "waste gate chatter" are not the same thing at all. Turbo stall is BAD and knackers turbochargers.

If worried about the noise then run a recirculating DV.

Every day is a school day ...........

How fast and how expensive ...... the same question...

At the risk of sounding very dence, Im gonna need a tiny bit more advise and explanation on this one, will ask now before I embarase myself (further) with stupid questions.
Cheers guys.
Shane.