| Author | Message | ||
     Kruse919 |
Ok I just bought a 2001 X1. Love the bike. I have two sportsters also. I am wanting to change my cams to .536 Screamin Eagle cams. I have used these in my 1993 sportster for years. My question is how do I raise the rev limiter in ecmspy. I would like to be able to shift at 7000 rpm. I have the ecmsy software and I am waiting for my cable I ordered. I have searched and searched on how to do this. I see people have done this but cant figure out how. Lots of people have posted on how to do it and people bash them and say the motor will blow up. I race sportsters and have since 2000. Just would like a little help with the rev limt. Thanks in advance for any and all help. | ||
| Preybird1 |
7k is pretty close to grenade on these bikes and i only went to 6900 on mine just in case. I had mine tuned by JTSperformance. You could call terry and ask how it is done. | ||
| Kalali |
Just wondering why would you want to shift at 7K RPMs? If you look at the power curve for the 1203cc it drops off after 6.4K-6.5K RPMs. Now regarding your specific question, I don't have it in front of me but one of the ECMSpy tabs has a table showing the engine speed among other things. I believe its on the top right position of the page. Let us know when you get the cable and we can walk you through it. | ||
| Pash |
Top right:  | ||
| Kalali |
Is that table from an X1? Some of those values seem to be out of whack, hi vs lo, etc. | ||
| Kruse919 |
Thanks for all the reply's! Regarding why I want to raise it a little is because I will be changing to the .536 cams. I will need to be shifting a little after the stock rev limit. Using them in my street/race sportster 7000 is where I always shifted. Cant wait to get my cable. Ecmspy looks a little intimidating. Ive been reading as much as I can about it. Always been a carb guy but im gonna give DDFI a try. | ||
| Screamer |
Kruse919 I agree with Kalali that ~6500 rpm is a reasonable peak on stock engines, but as you'e discovered 7000 rpm is not an issue as long as the valve train (and the rest of the motor ) is set up properly. We've used 7800-8000 as a shift point on one of our Bonneville bikes with stock rods for years. Our only issue was one season experimenting with some extreme high dome (and extremely heavy) pistons that stretched the wristpin hole. Have a mild street S2 that makes peak power at 6800-7000 (I'd have to look it up) it's been frequently shifted at 7200-7500 for 15k mi with no issues - but it has a good valve train. | ||
| Preybird1 |
I should have mentioned that i have an upgraded valve train and .536 SE cams with a big bore kit on it. My valves are smaller diameter stems than the stock at 7mm from the stock 10mm and single beehive XB valve springs in XB heads. My motor build makes it's peak power at 6486 on the rpms and begins to fall at 6600 rpms. Hp goes about 1 more hp but the torque falls off at 6500 rpms. But with the lighter valves the top end spins up a little quicker. And the single springs work perfectly for this application. | ||
| Buellistic |
6800 RPM is the MAXIMUM RPM you should gear for and shift at !!! My stock 1958 XL(883) would easily rev to 6800 and so would my 1997 S3T before "i" started product improving it ... "BUT" your engine will last longer if you keep the rev's down at 6500 max. ... | ||
| Screamer |
Buellistic, Agreed - 6800 rpm may be the typical top RPM you should shift at for a motor with a stock bottom end and stock valve train. | ||
| Kruse919 |
Thanks guys took a couple minutes but I figured out where and how to change it. Cant wait till I get cams. I hope tuning wont be to hard. |
