[Damo]

Hi Guys

Well my Birthday has gone and past and now I have the brakes my friends have put money together to get me going faster (Thanks guys!).

Now I already have on my car:
Alta Air Intake
GRS Intercooler
Play MINI Exhuast

Anyway my original plan was to play it a bit safe and get the following:

Alta V2 15% Reduced Supercharger Pulley (With Belt) from Lohen
NGK Iridium Spark plugs (care of GTT or MINImania)

Now I'm looking to fit these myself (with a lot of help from a close friend )...

...however having done a bit of reading here on MINI2, its had me thinking. I know that Wide Open Throttle (WOT) in 5th and 6th in a tuned Cooper S is an engine killer (along with thrashing the car ALL the time something I don't do). Its not something I'd done often, and not at all after reading rather long threads on here.

So with the WOT in 5th and 6th, I was looking for a bit more mid range grunt with less throttle so was considering a 17% reduction pulley instead.

But I want to play it safe, as I can't afford to blow up the engine. I always use V Power fuel, to the point of arriving at the fore court with - - - on the Rev Counter once rather than fill up with lesser stuff. (I would now put a £5 of lower stuff in then go fill her up with V power now mind scary stuff that - - -)

Having done some reading anyway, it would seem that bigger injectors help out at the top end when tuning the car, and as I can get some JCW injectors (380cc I think) relatively cheaply it seemed a good idea if I went for a 17% reduction pulley.

The thing is, I'm not mapping the car anytime soon as if I do decide to map it, I'll want to go for a live one, again to err on the side of caution.

So how do the injectors work, as when it comes to these paticular items I haven't a clue.

I was under impression that the standard ECU would just tell the injectors to put x amount of fuel in (not quite as simple as that I know), and because they're bigger they could get it in quicker than the smaller injectors.

However if its a case of they tell the injectors how long to put fuel in how is this going to effect whether the car will need a map more, and be adaptable

So bit of advice on injectors really as got three options...

15% Pulley + plugs
or
15% Pulley + plugs + injectors
or
17% Pulley + plugs + injectors

Cheers in advance

[Capsaisin]

Well I have the GTT 17% pulley and can only pass on what Roland told me. He said that my car would be OK with standard injectors as long as I did not use sustained WOT in 5th and 6th, but might benefit at the top end with larger injectors.
He told me that the car would not need a remap if larger injectors were fitted.
I assume this would apply to the standard BMW map, although I have the MTH tuner map which was originally set for standard injectors.

Hope this helps, and no doubt Roland will correct me if I misunderstood.

Personally I would go for the 17% pulley - err, oh I did!

[Aberdeen Al]

Consider adding an oversized lightened crank pulley too.

[Damo]

Money won't allow for an oversized crank pulley (as I'll need alternator pulley to). But with 17% will be happy. Maybe (big maybe though) if I want more from the car go for a lightened one in the future.

If had the money woulf of gone 15% and enlarged crank pulley but 17% should be enough.

[Rigsey]

I have the GTT220+ pack fitted as was given the same advice by Roland as Capsaisin states.

I'd definitely recommend the 17% pulley as in my opinion it puts the power/torque lower down the rev range.

To be honest you will moving along at a brisk pace once you reach 5th and 6th and therefore you probably would not need WOT :-)

Does having the JCW injectors remove the 5th and 6th WOT concern? Not as far as I can tell from previous posts.

[Damo]

I'm not planning or trying to reduce the risks of WOT in 5th or 6th.

The reason for the 17% was to give more umpth in general lower down the rev range when in 5th and 6th so therfore not needing WOT anyway.

The injectors is more for safe guarding the engine at WOT in other gears higher up the rev range. Considering 4th's top end is well into 3 figure speeds, not to fussed about high rev's in 5th + 6th.

[roland2003]

Hi guys,...... yes Id agree with that!!