I wish I had ther 475 first. I did the JDM stage II which I thought was about the same thing, and it is amazing. I Would hope that he can easily tell the difference within a matter of a minute to be honest.
I should think so.... it goes from a 3.875" pulley to a 2.875" pulley
Actually it was 4.0,3.8,3.6,3.2, in this order not the economically way to go, but doing the installs myself saved alot and learned alot, so I'm still ahead.
gadway41, can you please tell me what the 550 kit consists of? I have the JDM stage II, and do not see anything that says 550. I am wondering what is different other than the pulley. Mine came with a 3.4. Thanks!
gadway41, can you please tell me what the 550 kit consists of? I have the JDM stage II, and do not see anything that says 550. I am wondering what is different other than the pulley. Mine came with a 3.4. Thanks!
desant89:
The 3.2 pulley, Dual Fuel Pumps, and tune = JDM 550 HP kit.
I believe Saleen's version of the 550 uses a 2.875 pulley.
hey i just got my JDM 550 kit installed last weekend by JDM...I will go back to them next weekend for the dyno and tune. Im curious to see what Power your gunna put out. I love the added power its amazing. Where are u getting your dyno done?
Automatic Transmission is now only a slipping transmission.
It soon was very apparrent that Dynoing these cars aren't such a good idea.
When your on the street with this much horsepower the rear tire spinning is the weakest link, on a Dyno the wheels can't spin, so were does all the stresses go "the transmission" so much for a safe tune.
So needless to say I'm Very Disappointed !! What started out as a nice Sunny day became crappy quick. Take a look.
ORIGINAL: gadway41 When your on the street with this much horsepower the rear tire spinning is the weakest link, on a Dyno the wheels can't spin, so were does all the stresses go "the transmission" so much for a safe tune.
^^I'm baffled by your statements... UNLESS somebody at the dyno shop effed up and had the dyno's roller brake on or not totally disengaged and you torque converter took the brunt of it.
Dynos do not hurt transmissions under normal circumstances.
I watched the guy doing the Dyno, actually his third time on my car. I was on the 2005-2008 mustang forum and brought this up and another long time member brought this same issue up:
Other than that I would not be suprised if the dyno got it. They will kill a clutch in a manual as well when it never slips on the street. I know JDM is big on tight belts but my guess is the low numbers are from the tranny slipping on the dyno. If the belt was to loose it would feel slower on the steet than it did in the previous tune.
Doesn't it make sense these mustangs with automatic's were original designed to see 300 hp. I'm sure there is a safety factor, but now at 550 hp. the tranny just can't take the torque.
On the street the tire can break loose, on the dyno your still turning the mass of the dyno.
Take a look on the other forum.
I'm not really sure what to do next on this problem.
Check the first page discussion on air/fuel ratios on Kennes site. I believe all this dyno testing is a big waste of your hard earned money. The autos have alot to lose on a dyno. That built up energy has to go somewhere and I believe you are asking for trouble winding up an automatic on a dyno. It will find the weakest link in your power train. Besides all these HP numbers are a big ego trip in my opinion. 400, 500, 550, 600, who cares!!!! judge it by the thrill in the seat as you're going down the road, not by some number on a dyno sheet. Dyno sheets will cost you in your self sponsored pocket book. Check out the fuel ratio tests on Bells site. They do'nt change!!!!
Check the first page discussion on air/fuel ratios on Kennes site. I believe all this dyno testing is a big waste of your hard earned money. The autos have alot to lose on a dyno. That built up energy has to go somewhere and I believe you are asking for trouble winding up an automatic on a dyno. It will find the weakest link in your power train. Besides all these HP numbers are a big ego trip in my opinion. 400, 500, 550, 600, who cares!!!! judge it by the thrill in the seat as you're going down the road, not by some number on a dyno sheet. Dyno sheets will cost you in your self sponsored pocket book. Check out the fuel ratio tests on Bells site. They do'nt change!!!!
ORIGINAL: gadway41 I'm not really sure what to do next on this problem.
TCI StreetFighter?
I found this site last night were you ask a question to a Ford expert for money and if there answer seem correct they get paid, what do you guy's think?
Hi, I have a 05 Saleen SC281 Ford Mustang with an automatic ...
Question: Hi, I have a 05 Saleen SC281 Ford Mustang with an automatic ... Posted By: saleen3 Question: Hi, I have a 05 Saleen SC281 Ford Mustang with an automatic ... Date Posted: April 20 2008 at 7:53pm
Hi, I have a 05 Saleen SC281 Ford Mustang with an automatic transmission. My problem I just installed a 550 hp JDM upgrade kit 1-week ago and everything worked fine, transmission shifted perfect very precise. I went to the Dyno yesterday to do a couple runs to check my A/F ratio which was fine at 11.6. It was suppose to pull around 460 at the rear wheels, only pulled 416. I call JDM and said it was do to the Belt they supplied me with my upgrade that it was to long and therefore the supercharger pulley was slipping, that seemed reasonable. As I left my Dyno shop I noticed 3rd was very weak. In other words, if I go through the gears manually at about 3000 rpm''s 1,2 are fine then when I put it in 3 it''s like I put it in neutral, If I back off the gas to about 2000 rpm''s 3 will kick in but if I increase the throttle a little faster than a gradual exceleration it acts like it is in neutral and rev''s to red line until I back out, 4 and 5 are fine? What is the problem?
Replies: Posted By: Vincent Date Posted: April 20 2008 at 9:15pm
It sounds like you have burnt up the band for third gear. In an automatic trans, there is a seperate clutch pack or band for each gear in your case the intermediate band applies to a drum. Chances are very good that the band is burnt and no longer to apply any friction against the drum. Hence the slippage.Part of the problem is: That transmission is close to it margins with the power that Saleen is running through it, and then add the reprogrammer and bump up the power. The weakest link is what is going to break first. In your case the transmission. Posted By: saleen3 Date Posted: April 21 2008 at 2:22am
Reply to Vincent's Post: What is the cheapest way out of this situation?
Jeff, I did have the 12lb 3.2 pulley, the 1075 belt with the Ford V 10 Water pump pulley installed on my car, as well as the revised JDM Street race tune for 12lbs and 10lbs.
I did tell the shop owner here, Don Walsh, about your situation, and Dyno jetting automatics in general. He also feels that it is a dicey proposition with the automatics and high power dyno tuning concerning the transmissions. He is hesitant about dynojetting high power tunes with automatics. I didn't realize this was an issue before.
With a 78 degree shop tempature, and 26% humidity, and a short test drive beforehand, my car pulled a 464rwhp and 440 torque. The shop agreed that this tune with a cool temp dyno @ 70 degrees and no heat soak would yield 475rwhp as a standard. The belt and arrangement seems to be correct with no belt slack or slippage. My A/F ratio has returned to an acceptable average as well, although it is still a bit rich from 3900-5000rpm.
I am very sorry about the transmission issue that occurred. I'll give you a call to see what more you've found out, Erik
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06' Mustang GT premium pkg, Saleen SC with JDM 550hp(flywheel) kit with 3.2 pulley. Complete Saleen & Steeda suspension upgrades, Borla exhaust 9,10x18 chrome bullitt wheels, 285/40/18 & 255/45/18 Nitto 555 tires. New car scent air freshener.
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JDM 550 kit - 
