Drivetrain Performance for Automatic Trans
#27
#29
Originally Posted by mdsbrain
And for a MINI to reach 270whp the car has to be turboed, Twincharged or a ton of Nitrous
I'd really like to see how the automatic transmission holds up to that kind of HP on an ongoing basis.
#30
Originally Posted by gmcdonnell
FWIW there's a guy in the Metroplex MINI club here in Dallas who's been dyno'd at 238 wheel horsepower without a turbo or nitrous. Assuming 88% drivetrain efficiency that's right at 270 horsepower at the crank. His mods include a CHR head, honed intake and SC runners, Shrick cam, JCW injectors, 15% pulley, lightened flywheel, Alta intake, Mini Madness header with a free flow cat, JCW exhaust w/o the resonator, watercooled intercooler and an ECU upgrade (can't remember whose). I think since that dyno he's replaced the 15% pulley with a 17% unit.
Originally Posted by gmcdonnell
I'd really like to see how the automatic transmission holds up to that kind of HP on an ongoing basis.
#31
#32
Originally Posted by mdsbrain
caminifan said exactly what I was gonna say. WHP and life of the tranny. With a Manual you can replace fried clutches and help it last a bit longer. With an auto we can just change the fluid right?
#33
#34
Originally Posted by caminifan
The fluid change is a very important preventive maintenance item. The key thing is to completely replace the fluid (as opposed to drain and refill). A drain and refill leaves the old fluid that was in the torque converter and transmission body still in place to contaminate the new fluid that was put in as part of the drain and refill. In addition, for really high torque applications (drag racers with inline engine/transmisison layouts), the transmisison can be "enhanced" (combination of torque converter and transmission clutch friction packs and the like are improved). Even up to ~300 ft lbs, finding a way to replace the transmission fluid on a 15,000 mile interval would see vastly improved transmission lifetime (150,000 to 200,000 miles), depending on driving style.
#35
I have the Alta Intake on my MCS automatic. Installed a few weeks ago and LOVE IT! The only thing is the throttle body whistle. It took me a bit of time to get used to hearing that sound. The hose is tough to put on and you need someone with little hands (I helped there) to get the tube connected to the hose. It also helped a bit with the gas mileage. Once I slowed down. mwahahaha!
Love the sounds it makes.
Love the sounds it makes.
#36
#37
Originally Posted by MINIGURU@WAY MOTOR WORKS
We have installed alot of intakes and pullies on MCSa's with great success.
Recently we had a special customer's car join the WMW fleet. We are doing several performance mods to her AT car to test the reliability and HP gain to make sure future AT customers will be satisfied.
Recently we had a special customer's car join the WMW fleet. We are doing several performance mods to her AT car to test the reliability and HP gain to make sure future AT customers will be satisfied.
I've visited your site a few times, and have been wondering about the Milltek cat-back. I've heard sound/video clips of it, but they were mostly at wide open throttle. Superb sound at full open, but I've wondered about the coasting/cruising sound being too loud. Any thoughts?
#39
Originally Posted by Stricks
I LOVE the Milltek on my MCSa! Great sound at WOT, and a nice conservative growl at cruising -- little to no droning. Acceleration at less than WOT gives a nice growl as well.
One other little question, is your Milltek the full system i.e. headers/cat-back or just the cat-back. Thanks again!
#40
Originally Posted by thespider530
Thanks for the info! A friend and I have been discussing the Milltek for a little bit, and that was the main thing that was worrying us. Some have said that the Alta intake makes more noise than the Milltek at cruising speeds. Thanks again for shedding some light on how awesome the Milltek is!
One other little question, is your Milltek the full system i.e. headers/cat-back or just the cat-back. Thanks again!
One other little question, is your Milltek the full system i.e. headers/cat-back or just the cat-back. Thanks again!
#41
wow - just discovered this thread - nice!
am thinking about adding an upgraded head to my car now that everything else is done. i suspect its really the only thing that keeps it from the full jcw works spec. anyone have any experience with replacing the head on an mcsa? i can only imagine how awesome it must be with the pulley/cai/exhaust...
cheers - drew
am thinking about adding an upgraded head to my car now that everything else is done. i suspect its really the only thing that keeps it from the full jcw works spec. anyone have any experience with replacing the head on an mcsa? i can only imagine how awesome it must be with the pulley/cai/exhaust...
cheers - drew
#42
Originally Posted by newyorkcitymini
wow - just discovered this thread - nice!
am thinking about adding an upgraded head to my car now that everything else is done. i suspect its really the only thing that keeps it from the full jcw works spec. anyone have any experience with replacing the head on an mcsa? i can only imagine how awesome it must be with the pulley/cai/exhaust...
cheers - drew
am thinking about adding an upgraded head to my car now that everything else is done. i suspect its really the only thing that keeps it from the full jcw works spec. anyone have any experience with replacing the head on an mcsa? i can only imagine how awesome it must be with the pulley/cai/exhaust...
cheers - drew
I don't know of anyone with an automatic S who's had headwork done but I'd love to hear from anyone who has!
#47
wow - just discovered this thread - nice!
am thinking about adding an upgraded head to my car now that everything else is done. i suspect its really the only thing that keeps it from the full jcw works spec. [Emphasis added.] anyone have any experience with replacing the head on an mcsa? i can only imagine how awesome it must be with the pulley/cai/exhaust...
cheers - drew
am thinking about adding an upgraded head to my car now that everything else is done. i suspect its really the only thing that keeps it from the full jcw works spec. [Emphasis added.] anyone have any experience with replacing the head on an mcsa? i can only imagine how awesome it must be with the pulley/cai/exhaust...
cheers - drew
#50
Could you elaborate on where/how you have heard? If you have a torque specification document from Aisin-Warner on the transmission's design torque limit, that would be great.