1430 turbo! Serious Power?
Turbo Mini Forums

Hi guys,

I am in need of some advice from the experts :>

I have recently crashed my 1275 Mini Sprite and have removed the engine from the shell and it is sitting in my garage! It's an A+ series and am going to use it as a basis for building a powerful engine!
I was initially going to build it as a N/A 1430 engine aiming for the 135ish bhp mark (race spec)! However, i have since seen some videos of turbo minis and am thinking about going down this route instead!

what is stopping me from going down the initial 1430 route but instead with a lower compression ratio and a turbo with high boost!
If i'm going to turbo it, i want it to be faster than the N/A 1430 engine would be (i.e more than 135bhp-which quite a few turbo minis produce less than even with a turbo)..........

so, seeing as you can turbo 1380's, whats going to change if i stroke the crankshaft to achieve 1430cc's combined with a suitable turbo to get some serious power from my future mini!

reliability is an issue to an extent..........i dont care if things go wrong that can be repaired without removing the engine (even if it's quite often) but i dont want to have to take the engine out for a full rebuild on a frequent basis!

What needs to be done to ensure i dont have to do this?

Any help will be great,

Cheers,

Mike

nothing stopping you, but lowing the cr on a 1430 will be quite hard to acheive

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

btw change your username from your email addy mate, otherwise youll find yourself getting lots of spam

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

the problem is getting the compression ratio down on a 1430, it would a better option to go 1293.

Bigger isnt always better.

or 1380 with some £400 pistons and about 20PSi, a good head and a good intercooler = 200 bananas

Shhh! I don't want people to have the same engine as me

If something is worth doing, it's worth doing half of.

I afraid Reliabity and high HP A-series just don’t go together mate. I would go so far as to say if you go over 130 - 160hp expect to be taking it apart frequently.

its the old saying you can have any of the following in very special cases if there is a lot of time and huge amounts of money are spent, you may be able to achieve two of, but Never three,
POWER
RELIABITY
ECONOMY

If you're only looking for around 130hp then i wouldn't worry about the displacement. 130hp is easily achievable with a 1275cc Turbo, or even a 998 !

WWW.TURBO-MINI.COM

firstley mowen, what pistons you are running ? and the cc you have in them, and the cc in the head, and the bore size and stroke of the crank, then we can figure it out for you whats possible ?
#

Ok thanks guys! I really appreciate all this help!
Oh, and i will change my username immediately:)

Well BENROSS, it is a standard 1275cc Sprite engine (A-plus) sitting in my garage waiting for me to decide what i'm going to do with it!
So basically, i'm open to all options at this point:)
the idea of a 1430 with a turbo excites me as noone has built one yet (as far as i'm aware) :)
All the torque of a 1430 with a turbo could be quite an amazing combination! If a 1380 turbo creates 200bhp, what could you expect from a 1430 turbo?
There must be a way to lower the compression enough to run a turbo......i live by the phrase "there's always a way" :)

Also, i meant that i will be wanting more than 135bhp if i'm going to turbo it as otherwise there's no point! 160-200+bhp would be acceptable :)

PaulH, what is it that would necessitate the complete dismantling of the engine on a frequent basis-which parts would fail?

People seem to adjust the boost of their turbos quite frequently, for example, I read recently that someone was running their new turbo engine in on 4psi of boost for the first 1500 miles and was then going to raise the boost afterwards!
How do you raise the boost and how easy is it to do?
And, does lower boost promote reliability?

Any help would be fantastic, :)

Cheers,

Mike

by the way, it won't let me change my username so looks like im stuck with it:)

GREAT

well if you are going to run 160 to 200 bhp your goning to be replacing gearbox's on a frequent basis for one probly thrust bearings because you will need a super heavy clutch to hold 200 poneys.

pm alex_b and he will work his magic with the username

was gonna change mine a while back so i dont sound like a 11 year old, but i just didnt feel right


what the guys are getting at is (i think) its easier to stick with smaller cc's, and spend the extra ££££'s youve saved on not buying 1430 parts (crank/block/pistons) on a sweet turbo and ignition setup, and you will probably have near as dammit the same power with more scope for upgrades/rebuilds/rebores in the future.

160 to 200 bananas will more than probably incurr frequent rebuilds (i believed Matt Woods has had around these power levels for many many moons, and rebuilds his box every year (or maybe every other??) checking the rest of the engine at the same time

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

As most people on this site " WHO KNOW A THING OR TWO ABOUT TURBO ENGINES" why not go for something good and reliable (1293cc =130 -160 BHP). But of course if you want to do a 1430 and it's possible why not as long as you realise whats involved.

Edited by Gavin Wakely on 21st Mar, 2009.

http://i28.photobucket.com/albums/c248/spe...er1/mini007.jpg

If it a'nt broke don't fix it !!!!!!!!!!!!!!!!!!!!!

I've changed your name to Mowen123 - you may have to log back in, so hopefully you'll check this thread.
-a

Brilliant, thanks AlexB! i thought i had been blocked for a minute when it wouldn't let me in :)

Cheers JoeyBaby83, i see what your getting at.....i wondered why all the other posts were very "anti-1430"? :) that makes sense now!

I have seen Matt Woods Mini in a minifilms video.......thats an awesome machine! how does he manage to get 225bhp out of a 1300 (which i assume is a 1293?) when noone else seems to get this much out of their 1293's?
oh and i dont mind having to rebuild it every year or other year i just dont want to do it every month or so :) is there not a gearbox that can handle all this power without the need to rebuild it all the time?

also, does the time-span of engine rebuilds depend on how much you rag the car? if i was driving below 2500rpm mostly, would it last longer?

cheers,

Mike

Many people on here are close to or over 200 bhp from 1293cc. It takes time and experience to get there, and lots of dosh!

Gearbox wise, a well built straight cut setup that is properly looked after will handle it, you just need some respect for the parts. mechanical sympathy goes a long way!

alot of people on here have at or over 200hp from under 1300cc, they jsut dont blow there trumptes about it :) most of your queries can be answered with a search, and as for the first, i know of atleast one built about 5 years ago, still got the crank and rods kicking about from my a-series days! really ought to e-bay the rods actually lol (cranks fucked) and i have no doubt that wasnt the first :)

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

so what seperates a 130bhp 1293 turbo mini from a 200+hp 1293 turbo mini? there has got to be some serious differences to gain 70bhp?

also, as the T2 turbo is well suited for low down power whereas the T3 may give higher peak power, which one of these (or any others such as the GT15 etc) would be best suited to get the fastest lap times possible on the track?

I'm not too bothered about a mini which will beat others on the drag strip, moreso on one which will keep up with VTECs and R1 at the MiniWorld action day up at Castlecombe :) haha

what's the best set-up to get these sort of power characteristics?

cheers,

Mike

££££ thats the difference!

AlexF

Thanks, that's really helped me understand.......:)

You can get any amout of power from any displacement you choose using a combination of forced induction and a shot of noz!

But theres a lot more to your question than than just that... What do you really want to know about?

How capacity effects the turbo?
How a turbo size dictates the ultimate power and engine can produce?

Alex

AlexF

The basics are generally the same, some good quality forged pistons, standard crank (maybe hardened), phase 2/3 cam, are the basic short block.

You'll need SC drops, SC box, X pin diff, decent clutch setup.

The main differences come with the, head, turbo, cam combinations and a good IC setup to lower the inlet temps. Most people also fit mapped ignition as it allows you more control and can help with reducing lag etc..

Im running a GT17 turbo and its a very good all round turbo...spools up very quickly and can also produced high boost at reasonable air temps. The T2/T2.5 also seems to be fitted with good success.

EDIT: There is no point fitting a massive turbo if the amount of air flowing out of the engine isn't enough to get it spinning. But if you fit a turbo thats too small it will go beyond its efficiency range, and only hold the engine back.

Edited by matty on 23rd Mar, 2009.

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www.fusionfabs.co.uk



1/4mile in 13.2sec @ 111 terminal on 15psi

now that was what i was looking for- cheers guys!

In reply to you Alex, i want to know the answer to both of those questions (however Matty answered the second one).
The first question i am interested in as i want to know what a capacity of 1430cc will do to the engine when coupled with a turbo?
-which rpm range will the power be seen in?
-what sort of power i could expect? -reliability compared to a 1293 turbo?

Matty, as you did not mention the T3, should i take that as not being as good as the T2 and T2.5?

What sort of power are you getting from your GT17 turbo? i've heard that these turbos are very good like you said-do you have any videos of yours in action?

cheers,
appreciate the help,

Mike

Really it's down to what you using the car far? People choose turbo's to suit ie spool quickly for more comp use but for example I'm using a t3 and going for big power out my 1380 and it's just going to be a weekend basher and nothing fancy so therefore I dont care when it spool's up even tho I'm pretty sure its at 2500 rpm.
But like people have said on this thread, the right setup does alot of wonders. If you searched on the forum and see what spec people use for their engine and what boost they are running then that's how they get there power.
People aim for round about 8:1 to 8.5:1 compression ratio and then run at least a bar in boost but people with the high power like 200 banana's run close to 2 bar in boost.
Now you just need to search what you want and what your prepared to pay and your there.

http://photobucket.com/quintonrose