[Andy@Ross-Tech.com]

[QQQ]

Base car was done in February, any difference in temperature? I assume it's a bit warmer in May?

Any news on a watercooled intercooler Andy?

Cheers

[Andy@Ross-Tech.com]

Max,

I definitely am interested in chips that deliver significant results and will post some testing soon.

QQQ,

The water/air is on the agenda too, but I haven't seen any production kits yet.

Obehave,

That difference is simply when the driver put down the pedal or the dyno operator started the test. Certainly, the engine makes torque from idle both stock and modded. I would not consider significant any of the data other than the "curves" in the plots.

[jlm]

i see the evil notch at 6200!

[Andy@Ross-Tech.com]

The notch is only quasi-evil, demi-evil, not-quite-evil enough.

BTW, using my baseline of 144.1 whp, if my MCS truly had 163 hp at the crank (I believe it did), then my crank horsepower now is about 196 hp and just shy of 180 lb/ft of torque.

Mods (retail price including installation):

Pulley $400-$500
Exhaust $600-700
Intake $300

Total $1300-1500

We'll see when the JCW cars start hitting the dragstrip, but I think the above 3 mods deliver the same result as the JCW kit at about 1/4 the installed price.

[suprchrgdmini]

andy,

1fastmcs said one of the magazines tested the jcw kit on the 1/4 mile and the best it ran was 15.1. that is horrible for all that money.Automobile magazine also did a write up on it and mike cooper is qouted as saying they only got 1.5 hp from computer upgrade. I wonder if they really know what they are doing.

[minime s]

When a JCW's car beats my time of 14.20 or even comes close it will be a miracle !!!

Don't think it's going to happen.

What a waste of $$$

[minime s]

check here

http://www.ross-tech.net/andy/mini/d...artermile.html

[1fastmcs]

Andy

What was the increase in H.P. with the Alta intake.

[Andy@Ross-Tech.com]

I've gotta do some back-to-back comparison testing to say for sure. Made an additional 1/2 psi.

[bigbaddaboom]

Just a query, it might be stupid...

In quarter mile times you get a trap speed that says how fast the car is going when it gets to the quarter mile. Is it safe to extrapolate (within reason of course) the 0-100 mph times from that? i.e. you get to the quarter mile at 95 mph in 14.5 secs do you reckon to go the extra 5 mph it might be another 0.75 secs or maybe 1 second (or somewhere in between)?

[minime s]

I would think the extra 5 MPH would be a little more than 1 sec.

[Andy@Ross-Tech.com]

I happened to log all the way up to 100 mph in my 14.7 @ 95.75 run. The 0-100 time was about 15.9 seconds.

[JiminVirginia]

I'm wondering, since there seems to be no engine management change. How lean is it above 3K rpm?

Thanks,

[Andy@Ross-Tech.com]

I didn't log A/F on the last run, but here was the A/F both stock and stock with the pulley:

[JiminVirginia]

So much for fears the engine will run too lean.

[jlm]

keep in mind the dyno runs are mostly WOT, a range where the engine management runs from a fuel look up table. At lesser throttle openings, the O2 sensor is giving feedback. My butt feedback tells me the mid-throttle range is rich as well!

I would assume that what you see in Andy's A/F curves is really a measure of A/F against rpm, not against throttle opening.

[Andy@Ross-Tech.com]

The fuel pressure regulator is located in the return line to the fuel tank. The more restriction in the regulator, the more pressure in the fuel going to the injectors. The fuel pressure regulator has a vacuum line running to the intake manifold. As manifold pressure increases, so does restriction in the fuel pressure regulator.

So, it is completely possible that the engine is mechanically adjusting for the increased boost simply through increased fuel pressure. I haven't yet logged injector pulse widths to tell for sure though. One thing is for sure - there are not any adverse driveability effects to running a pulley with the stock programming. Long-term results will take some time, but there are now hundreds of thousands of cumulative miles on pulley'ed cars and I haven't heard of ANY problems apart from the occasional minor installation error.