I do wonder if perhaps a LSD would not allow the 19% to show more of a gain? Especially in the short times (60' and 330' marks) as getting off the line and the 1st to 2nd shift traction should be noticeably improved and the additional low end grunt applied better.

Luckily my Quaife is in already, so maybe I will see how fast this thing can be...

 

>>Here's an interesting comparison. Last July, I ran a 14.745 @ 93.61 with my 15% pulley. Here it is plotted with the 14.783 @ 93.73 that I ran last night with the 19%.
>>
>>
>>
>>Considerably more boost, very similar speeds. Hmmmm ....


Is the above 15% run with the Magnaflow? If so, it's not too surprising to see the magnaflow + 15% = the one-ball + 19% since the above comparison is in the high rpm range.

 

I doubt the limited slip would make much difference in my dragstrip runs. Wheelspin was pretty even from side to side:



fueledbymetal,

That could make a difference, but I saw similar behavior on the street with the 19% and the Magnaflow. Acceleration was much greater than the 15% at relatively low rpm, but as revs climbed, acceleration curves converged.

 

Also Andy as you have stated the temps are higher on the 19 at higher revs, maybe time to upgrade the intercooler.......

 

A new IC is in the works. In the meantime, I'm going to collect more data with the 19% and 15% pulleys using the stock intercooler.

 

I think Andy is right on the nose with this one. Once you get out of first gear, it's all 5k RPM to redline. And the 19% and 15% only differ by a couple HP at best at the high end. So the difference is probably not that great. However, it's this reason that makes the 19% ideal for the street. First of all, most of us would agree (I think) that the MCS has decent power at high RPMs with just an intake and exhaust. The 15% pulley gives power everywhere so you still find yourself taking it to redline to go fast. But the 19% gives so much more torque that it evens out the powerband to a good degree. It adds A LOT of torque with just a little highend HP. Exactly what most of us want in the first place.

 

Also another problem you are more than likely running into, is the engines inability to breathe a higher revs, anotyher thing you should probably look into is a good head, and header. The exhaust port and valve just are not capable of getting rid of all the exhaust, hurting the upper end performance, also in turn you will lose some of your peak boost with this, but it is not a bad thing because you actually gaining flow....and a higher quality burn in the chamber at high revs, the result is power, and if done correctly lots of it. Just think if they are gaining 10-15 hp on a stock motor by upping the head, we are adding the boost so there is no reason we couldnt get 25-30 or more.... :evil:

 

Also andy have you checked your back pressure with the one ball, its kinda a guidline to stay at 4 psi or less for good exhaust flow....

 

Do you happen to have an exhaust back pressure tester? They only run about $30, but it's the kind of thing I'd only use once.

http://www.promini.com/products/back...retester.shtml

BTW, I have compared my logs from 19%, Magnaflow with 19%, One-Ball. At a given rpm, all of the logs show the same manifold pressure, within about 25 mbar (0.3 psi) of eachother. For example, at 6,000 rpm, on logs taken 4 different days with 2 different exhausts, all 4 logs show between 2025 and 2045 mbar absolute (about 14.9 - 15.2 psi gauge).
_________________
SHOW ME THE NUMBERS!

...How Fast is Your MINI?...My Mods...

 

This isn't that surprising (that 19% 1/4 miles times may not be that much better than 15% times). Remember, the 15% adds around 15lbs of torque AND 15HP over stock. It also gives the torque earlier. This makes acceleration throughout the entire RPM range much greater. The 19%, in theory, should only add 4lbs of torque and 4HP over the 15%. Not much difference. But in reality, it appears the 19% makes twice the torque it should (up to 8lbs) but even less HP than it should (2 versus 4). Thus in the 1/4 mile, the difference may not be that great. However, not only do you get a lot more torque, you get it even earlier. So acceleration at 2k RPMs with the 19% will kill the 15% at the same RPMs. That's the difference you feel in everyday driving. That's the difference you feel everytime you touch the gas. With the 19% you help "even out" the power in the MCS. It has good high-end power but now you'll have good low-end power too! As a matter of fact, when you get the 19%, it's the low-end power that really impresses the crapola out of you. With the 19%, you don't need to downshift if you don't want to. Make a turn at an intersection in third; cruise around town in fourth; pass a car going uphill on a highway in 6th!

So don't be "bummed" that the 19% won't make your MINI a much faster ride. Because it will. It'll seem like a whole difference class of vehicle with the newfound power it brings. Just the only area that may not improve significantly will be the 1/4 mile. That's it!EVERY other aspect of driving and driving fast is significantly improved with the 19%. I know I've praised the 19% to no end and you're all probably sick of hearing me talk about it. But those that have it will agree - get it and you'll understand what we're talking about. THis is the "great equalizer" mod - the one that "evens out" the MINI's powerband. No longer is it a weaker 4-cylinder with all its power over 5k RPMs. THe 19% makes the MCS driveable in the 1k RPM range - what other 4 cylinder can say that (ok under $25k).

 

:smile:

_________________
Click Here For My MINI Super Spring Cleaning Sale!

 

Very well said greatgro. I hear ya. I have a couple 1/4 mile "straights" into out of the canyon where I live. When I find someone to play with, these are the stretches that I typically dread. So, that is why I'm particularly interested in Andy's Log, and the 19% as some added help in these WOT, near redline shifts. I was hoping that the 19% might be a major help in that area, but minus the addition of other goodies, that seems not to be case.

That's ok. After adding over 40hp (best guess), and dropping a little over 150 pounds, I can now stay in the hunt on these straights with M3's, 350Zs and the like. Heck, before I would darn near dissappear in the rear view mirrors. If they can distance me there, it doesn't matter a whole heck of a lot in the turns if I can't find them. Not the case anymore as they can't shake me :smile:

I can't wait to see what the addition of after mkt ICs do for the 19%!

 

I plugged the results from that timeslip into the drag calculator:

http://www.turbofast.com.au/Drag.html

From Cheese's data:
2688 lb, 73.33 mph = 83 whp
2688 lb,18.452 s = 85 whp

From my data:
2888 lb, 93.8 mph = 186 whp
2888 lb, 14.948 s = 171 whp

Fairly reasonable guesstimates for a 108 bhp Scion and my modded MCS.

 

>> [quote] So acceleration at 2k RPMs with the 19% will kill the 15% at the same RPMs. That's the difference you feel in everyday driving.

Really? I thought there was a bypass valve that didnt close until 2800RPM

 

Actually andy i dont but i will get one.... Ill do some quick test and send it up to you, i keep forgetting to get your mag to ya, its a little higher "resolution " than the one i bought from macncheese, i keep grabbing your instead of mine

 

>>A new IC is in the works. In the meantime, I'm going to collect more data with the 19% and 15% pulleys using the stock intercooler.

I look forward to this data! I'll be going with either the 15% and software or the 19% and intercooler, but I want somebody to "SHOW ME THE NMBERS" first!

 

I know that someone posted on this site that they thought this was the case. But 1- I've seen no one else back this up and 2- I know from experience with both th 15% and 19% that this definitely is NOT the case. There have been dyno runs posted here on the 15% that clearly showed the stock boost numbers and the torque curve moved over to the left about 800RPMs. There was no such jump around 2800RPMs or so. In fact, the 15% made the 2k RPMs driveable versus stock. That wouldn't be the case if the bypass valve was open until 2800 RPMs. And the 19% makes the 2k RPM range not only useful, but quick. Heck now the 1k RPM range is even driveable. So there's no way that there is no boost until 2800RPMs. I have to cry Bogus on that one.

 

The bypass valve is mechanical, any time you accelerate it will close, though closure is totally dependent on engine vacuum. Part throttle will close the valve part way, until vacuum reaches 0 psi, at which time the valve is completely closed. So at 700 rpm (assuming a low idle) if you floor the accelerator, the valve will be closed from that point till you lift/hit the rev limiter.

Or you can zip-tie it closed and see boost in neutral... just for kicks.

_________________

 

to elaborate on 2cool's remark: the bypass valve is normally held closed with a spring. It opens via the vacuum connection to the manifold between the throttle body and the blower intake. With the throttle closed, this vacuum operates a diaphragm overriding the spring and opening the valve. When you open the throttle, the vacuum goes to ambient pressure and the spring closes the bypass. The only adjsutment is a stop screw to set the totally closed position.

 

Is this the best thread to subscribe to for drag racing on NAM?

Also, going to Atco Raceway in NJ tomorrow night Thursday 19th to get my before mods slip. All I have done right now is a set of OZ Superleggeras which save me about 40 lbs with AVS ES-100s

Thought if anyone wants to come along it would be great to meet some of you and get to know you better before I start remove you from your positions on the list . Oh yes he did...

So if you are free or not free but can make yourself free then lets gtg tomorrow and sorry for the late notice..

Craig

 

I was thinking of doing some runs this sunday at e-town.

It was supposed to be a harley day, but that was canceled.

 

Unfortunatley I have plans already for the weekend and also promised a friend I would go with them to Atco tomorrow.. Again if anyone can make it and wants to join in it would be cool! Also, whassup with the B&M shifter for 04+? I never heard from ya..

 

Hmm.. Mabye I can get to atco, WHat time you going? No new news from B&M. Probably going to be some time yet.