Hi again,

My new project is Twincharged Mini. I've a Gt2871 Turbo - 450 CC injectors - Frontmount Intercooler - Dr Schrick Cams - Turbo Headers and etc.

I've some questions about that.

first one is about Ecu. I dont have a standalone ecu. Can I use my car's Oem ecu?

Should i change pistons ?

My cylinder head will be ported & polished. Is it enough ?

I need all your experiences.

Thanks for helping.

 

^ answers above - if you are going big 450's won't be enough get a set of bigger injectors

 

PM Sent

 

@D-man thanx for reply

@Vollgas got pm

 

I think if your goals are huge power, you need to rework the head. Bigger valves and springs that can handle the revs. You can tune the oem ecu to work well. You should have goals stated. At 250 hp or so, the issue of getting the power to the ground is just as important. You will need a LSD too.

 

my goal is not huge power just 250 - 280 hp.

 

To ansewer some of your questions.
1. ECU can be stock but it must be reworked.
2.The stock pistons with an 8.3:1 CR are just what you need.
You do not want any higher CR than that.
3. I would recommend a BVH, completely ported.
4. Injectors should be 550 min. will probally have to go to 750's.
5. You would not need FMIC. You should be able to use stock IC or larger after market top mount IC.

 

Vollgas thank u. can i replace my ic with gp intercooler?

secondly what is stock compression ratio of mini cooper s r53 ?

 

Stock CR of R53 is 8.3:1
I'm not sure about GP IC.
Would probally fit with some mods.

 

If you don't mind a suggestion.
There were 2 companies that produced twin charge systems for the MCS, Alta and Helix.
Both companies ended up with the same issue of getting the car tuned with 2 different induction systems.
Very difficult to do.
Since you already have purchased a turbo, why not consider just running it.
The SC requires a driven system via belt.
All of the friction created by SC gears, belt drive, water pump reduce the hp that a SC creates. Under driving the SC creates even more friction.
The advantage of a turbo is that it is using a spent form of energy to create it's power. The only friction within a turbo system is 2 sets of ball bearings.
You want a hp range of 250+. You can get that with just a turbo. You don't need to have a second charge system.

 

Look at the DoS Intercoolers. The new DOS A2A would seem to be more effective than the GP even, and it seems to be the same size as the stock IC.

here is a link.
http://defendersofspeed.com/store/pr...?id_product=33

Also with that much charge, think of using a water/meth kit.

Talk to Jan at RMW for your Injectors, and possibly tuning if you can.

@ Vollgas, While you are very correct about straight turbo vs twurbo, that's just no where near as cool a solution. With a Twin charge system when people ask if its super or turbo, you get to answer BOTH. That's just awesome. Cool factor> Practicality. lol.

 

For that size turbo, you mine as well go full turbo. Look up Mynes Performance, or hop on their forum, www.mynesperformance.com They have done many a turbo build and they specialize in tunes. More information there. I think the FA53 Remote tuning software is a probable solution for you because you live so far.

 

Problem is just going to only a turbo is tuning....
the SC was kept so you did not need a standalone engine management system...
A SC motor idles as a normaly asperated motor...little or no boost....a turbo has boost all the time.....
The twin charger system was the solution....but was troublesome....and on a front wheel car, the sheer hp was always problematic ....better options imo is to get a bigger SC, like a m62 sc, underdrive it, and run a electric waterpump.....
It would still be relilable....not a high strung garage queen....if you want a turbo mini, buy a gen2
Anything is possible with unlimited time and money.....but some very good folks with lots of rescources have tried the dual charging route....very limited sucess...
The stock motor does have limits....custom pistons would be a must...stock usually fail around 18+ psi.....and spending this much money on anything less than fresh rebuild is foolhardy....
that and not to slam you....if you think 450cc injectors are big enough....time to re-evulate....a monster mini will need lots more fuel....as much for cooling as for fuel if you want to run for more than a couple of thousand miles.....
think e85 for octane....and a day on a dyno....and a great tuner like Jan....

 

The GP ic is only slightly better than stock, but fits with minimals mods....not a concern....your engine bay will have so much custom, mounting an aftermarket ic will be the simplest thing you have ahead of you!!

 

PS good luck....if can make it work,sucessfully wading throug the pitfalls, it will be an awsome car!

 

There is only one twincharge setup that I can think of that is currently running successfully: search username works4me. I don't think he updates on NAM anymore, but he does occasionally update on another site (which I won't mention, since I apparently got in trouble last time for doing so).

Hit him up with some questions, he has worked most kinks out.

You can also search for username Tuls, he had a monster twincharge setup that ran for a long time before before bad gas made a mess of things. Actually, several members that don't post anymore had twincharge setups, most have either moved to single turbo, or just plain moved on or disappeared from the forums. In this particular topic, search is your best friend, more so than opinions from people that have never run a twincharge setup.

 

If you are after 250-280 Whp, why not just look at Jan's/RMW's Rotrex kit. That'll give you all the WHp you need and then some.......

 

i sent a message to Jan but he didnt reply :(

 

Call him.. He gets tons of e mail.. Pretty easy to get the power you want with the stock SC, more if upgrade to the Rotex
RMW head, cam, header, tune, will have you right at 250 HP +- a few..
Sounds easy and it is when using the right parts..

 

Or you could go a sprintex.....

 

Mybe once it gets a few thousand miles under it's belt and some real track testing.

Hey D, where in OZ do you live? I'm going to be their in May on business.

LB

 

Sydney

 

Bingo

RMW head, cam, injectors, header and tune. Add a Howerton Engineering meth system and your done

Longboard.

 

Turbo cars are not in boost all the time, while running at cruising speed, unless required like comming up a hill they are not in boost. Pretty much acts like a supercharger. The difference between the supercharger and the turbocharger is when you hit the throttle in a supercharged car the boost is relevant to what your RPM is. In a turbo car, when you hit the gas the turbo needs time to spool up due to the wastegates closing and forcing the air through the turbine wheel. this is also called turbo lag.

 

i want a system like that.

it looks like VW 1.4 TSI engine's twincharger system.



i will use supercharge until 3500 rpm after 3500 rpm turbo will spool.