[Karfox]

Hey.

We are from Poland.

Our setup in Cooper S 2003:

17% pulley
Cold Air Intake
Full Exhaust without cat
2% oversized crank pulley
...and some ECU upgrade (we dont know details)

Dyno shows max 211 HP and 250 Nm. This power on ENGINE.

We want put Nitrous Kit with a piggyback, it will back 3 grad ignition (when shot).

We think, the power in this setup should be more.
We had also problems with throttle body. It was shut down in WOT.

Any ideas?

[Cooooooperslad]

effective to -19% pulley size, ouch

[Karfox]

Yes, but ECU soft is not good we think... and the throttle problems worries Us.
And why "ouch" ? ;-)

[Karfox]

PS. our engilsh is not to good ;-)

[Richard Crofts]

Basically it is believed that going above 17% reduced pulley and 1% oversized crank (effective as 18% reduction) generates far too much heat on the inlet.... thus loosing you power.

Also the most important things I note are this to elplain possible low power for your car

1. Too hot on inlet (too much reduction/oversize on the pulleys) - Try fitting a 15% reduced pulley and keeping your 2% oversized crank.

2. The manifold (header) design you have pictured does not appear to be that condusive to good flow. Very strange arrangement on the pipes and this could cause it to generate too much back pressure or a turbulant flow, thus meaning you don't get the power you could have achieved - Try using a nicer flow line and feeding either as 4 branches into 2 branches and then into 1 branch. Or a 4 branch into a single pipe in one v form. See GTT/Janspeed, milltek and Minimaniauk manifold designs for good shapes for flow.

3. We have no idea what diameter of pipe you are using on the maifold/header (it does not look that big) but using too large pipe means loss of engines ability to "scavenge" air properly and so loss in possible power. Too small means it is too restrictive and so back pressure is too high and again a loss in power. many manufacturers seem to go between 2.5" and 3" pipes on the exhaust and something else on the manifold...do a search or check some websites of tuners for technical specs of thier manifolds.

4. The exhausts final section post silencer (muffler) boxes looks very twisty. See if you can free up some of the flow by moving the silencers back a touch and then making the sweep back in to the centre rear valance a bit less twisty. Alternative is to do what I am doing and fit a straight line from the possition of where the cat would have been straight to the rear of the car with no bends

5. What intercooler are you running, you don't say. You need a major good intercooler if your running over 15% reduction pulley and even on a 15% you need to uprate the intercooler or all the air going in is too hot and so not developing as much power as you could if the IC was able to cool it. I run a 15% reduced pulley and a stock IC at the moment...this is not sufficient the inlet and post IC horns are almost the same temp once up to running temps which means the car is trying to power using hot air. For power you need cold air.

6. What intake ar you using. A high flow cone in the engine bay of an S will not work as well as it could. It needs to be sheilded from the warm air of the manifold and the intercooler etc. You need to look at the Alta or GTT websites to see how this is done and replicate or purchase something yourselves to ensure the air to engine is as cold as possible before being compressed by supecharger.

7. What map is it using? Could be the map is running you lean (therefore hotter and so loosing power). The map could be a poor one, try reflashing the standard JCW or Cooper S map back onto the car and see what difference that makes (the normal map is very good at being able to deal with high power, if you help it with bigger injectors etc)

8. What Injectors have you got? On a set-up like you have you need at least 380cc JCW injectors or preferably something bigger like 400-450cc because of the very high boost you should be achieving. See GTTuning.com for details on variable fuel pressure regulators and big injectors that might help you achieve better burn, lower running tempretures and so more power.

Hope that helps.

Richard

PS the car does look very nice though...I love those wheels with the purple rim!

[Karfox]

The intake and exhaust are from Mg Motorsport .mgmotorsport.pl
- this a very good tuner in Europe.

Map is from Germany. I dont know this tuner - maybe I could send You this map for email to look.

Injectors are stock, but AFR is very good.

I think U may be right with IC. I have idea to cooling the IC wiht Nitrous Oxide in critical moments.
I have also piggyback for progressive shots.

[MINIMANIAUK]

17% and 2% crankpulley may be more than 19% , a lot more!! if this is the case and the cylinder head is standard you may be getting very high boost pressures,this can cause some issues with heat .
Have you measured your boost pressure across the rpm range?

[Karfox]

My boost gauge show max 1,1 bar. I think when throttle will be full opened, that boost would be more.

[MINI-Morgan]

I've expect to be seeing 1.2-1.3bar with that much of a reduction but then its probably red hot too! I personally think you need a big intercooler on there for one thing and check the bypass valve is closing perfectly. I just keep thinking too much revs for the supercharger though....

What was the WHP? might seem low due to correction factor too....

[adamos o3,cooper s]

contact 1320.com paul is the main man for nitros.

[Paul Webster]

Karfox,

What a nice looking Mini you've got there, is that an old Rover Metro colour?? Wheels look cool as well.

Is there anyway you can post on here your dyno graph.

We have found on our car it picks up hp with a cat in place and it likes a restrictive exhaust making lot more torque down below

You're right on the boost you should be seeing more, you might have a boost leak or your guage may not be accurate.

Dont forget you have an early grey coated supercharger on it so boost will be lower than a teflon supercharger.

To be honest we favour 15% only due to the less heat made by the supercharger, we have run a best of 13.25@102 with a stock head, 15%pulley,teflon blower, Janspeed manifold, GRS Intercooler, a one ball ex system and a cam (06 gearbox better ratios)

YouTube - Mini OneS 13.35

Dont forget you have an early grey coated supercharger on it so boost will be lower than a teflon supercharger.

As for nitrous we prefera wet shot, we use an annular nos nozzle and used a minium of 75 shot, you willneed to uprate the front wishbone rear bushes to stop axle tramp when the nitrous hit. Also with the heat you're generating because of the 17% 2%combo I'm not sure if the nitrous is such a good thing.

We done 100 nitrous passes in 06 with a stock engine, only had one failure due to a block fuel jet.

Good luck with it , by the way your English is better than my Polish

[Karfox]

Thank U all for your opinions. Stay tuned ;-)