Engine Misfire - UPDATE - Over Rev

[Yamadog]

Are you still running the stock 8 jp belt? cause I was in that video. The next day I went to a drag race and switched to a brand new 8 dn and never hit the limiter once in 6 WOT runs.

 

[Martens199]

Well its hard to envision but if the secondary spring is too soft and the primary clutch starts to shift out the secondary opens too easy allowing the primary to overdrive the belt if you get my meaning. So it results in lighter tension and slippage will cause you to over rev.

Ok yup so the cat spring adds more tension on the belt before shifting. Its really feels like slippage more than anything. I have been searching for a chart to know the tensions and the colors.

 

[Martens199]

Are you still running the stock 8 jp belt? cause I was in that video. The next day I went to a drag race and switched to a brand new 8 dn and never hit the limiter once in 6 WOT runs.

No I am running the 8DN belt. If i Put the 8JP belt back on its way worse.

 

[Martens199]

Try running a blue-white-blue primary spring, 14.5 rollers, purple EPI cat secondary spring (1-0) and a 47* or 51* helix.

EPI is a brand name? Also why a cat spring, is it because they don't list my sled on there site? Sorry new at clutching so all info is good info to me.

 

[Yamadog]

Yeah sorry I think you said that earlier. I'm trying to work and keep up on here. And wishing I was dropping the hammer on one of my Vipers

 

[Armani]

Yes mine makes more hp in certain conditions temp, altitude and humidity still play a big factor. Even though I am clutched for 13#'s I can still hit it on wot runs at 9#'s. Both you guys are running MTN machines so your gearing is much lower and plays a part in that also. Hitting the limiter will not hurt it just takes away power.

Armani if your running pc5 and clutched for 9800 rpms and hitting the rev limiter it did not move your rev limiter unless you meant to say 8800 rpms. 9800 seems awful high and bad for the clutch.

Primary springs, helixes, arm weights, gearing and drivers all play into what is happening and you can chase it several ways and get more screwed up then before. I would start by adding a few grams to the arms and see what kind of results you get. Then spend money on more parts if a no go. Even where the weight is in the arm will cause it to hit faster and over rev on launch and then come back to you at the top end. I used to run Heel clicker II because you could load those in 3 places in the arm and then on the rotating weight it took a bit to get dialed but when drag racing you could get an apex to snap to 10,900 rpms and stay there through out the entire run.

Right now i`m clutchèd perfect for old rev limit at 9350rpm, and will stay that way until i`m sure the rev extend is working, i know for sure the rev extend is not working because i`m testing
with long pull and hitting limiter at 9350.

My plan is to higher the limiter and clutch for a peak to 9600-700 and then at WOT steady 9400

Limiter is taking away fuel, and at 9350rpm with boost i`m sure the engine could blow., and easy to se in my A/F ratio Log.

I`m using the RAT weights from BenderRacing., very nice backshift, very similar to HC 2 speed, but needed som modifications to add some more grams below 280hp.

 

[Martens199]

What do you need to do to higher the rev limiter? I thought the limiter took away spark as well?

 

[Armani]

What do you need to do to higher the rev limiter? I thought the limiter took away spark as well?

Powercommander and Ign Module to extend rev limit, or a EVO Reflash of internal ECU