StangRalle

Hey guys, I did my first dyno run today and wanted to to several runs with:

- the stock tune
- Brenspeed 98 & 100 Octane tune for Europe

Well everything went fine when we started the first run, but then when changing into the 3rd gear at 3k rpm the motor stopped, so we couldn't continue with the run. We tried again, same ****...

Then I thought maybe its the rpm limiter and put the Brenspeed custom tune on. Same thing at 3k rpm in the 3rd gear.

I documented it with my video cam: http://www.youtube.com/watch?v=R-aysJI5lqM

Does anyone have a clue what this might be?

And yes, TCS was off the whole time.

I was worried that something might be wrong with the motor. So I took my Stang for a rough spin on the German Autobahn and no problems. I could squeeze it up to 7-8 rpm in any gear.

Thanks for any constructive input.

tom281

Sorry, no clue.....

StangRalle

This really sucks. I hope someone might have an idea.

I also contacted Brenspeed to see if they now something.

Have you heard of this happening before?

Bullitt995

You're spinning the motor over 7000 rpms? And dynos should be done in 4th.

StangRalle

Nope, I said that when in the 3rd, the motor would not go beyond 3000 rpms on the dyno.

I also said, that when I was on the Motorway, I COULD squeeze my Stang without any problems.

So where is the issue? I don't know. Seems like something is preventing my Stang to go beyond 3000 rpms in the 3rd on the dyno. This is what I would like to resolve so I can finally finish my dyno run to get results.

StangRalle

It is very odd. No one heard of this before and no one knows any remedies...

You know what... screw the dyno... I know I'm fast...

DarkFireGT

I had this happen once when I messed with the neutral rev limiter (though it did it in all gears). I thought I'd set the neutral rev limiter to 2500 for the track. It didn't work, though. I limited it in gear too. Might want to check that out. Also, of course, try reinstalling the tune as well.

StangRalle

Thanks man. I have a manual trans.

Bullitt995

Also be careful trusting the octane ratings over there. They usually only use the RON or MON number and not the R+M/2 method so the octane rating could be much lower in reality.

theedge67

I'm still troubled by you saying that you could "squeeze it up to 7-8 rpm". You are saying that you were taking the engine up to 7000-8000rpm?? That is asking for trouble my friend. I wouldn't take it over 6,500 for any reason. 8,000 is engine suicide time. There is a reason the stock computer tune has a rev limiter set at 6,250.

StangRalle

Well i could, as I was unsure if something is wrong with my motor and to see if the rev limiter is off. It worked out fine. I still live, my motor still lives and unfortunately the dyno problem also still lives.

I'll see if I can find the problem somehow, as it seems, no one had this before .

Sounds like this song from Leathal Weapon: 'I hate to say it, but its probably me...' (Sting).

StangRalle

Antiknock-Index versus RON / MON:
In the USA octane ratings are specified by the Antiknock-Index. In Europe ratings are mostly specified by RON and MON. The Antiknock-Index is the average between MON and RON. The automotive gasoline RON value is appx 10 octane higher than MON.
Autofuel-Norms:
Automotive gasoline fuel specs in USA follow norm ASTM D4818. In Europe norm EN228 is valid. Both norms are similar (a car manufactured in USA burns also European fuel and vice versa…).

Shawn13

Send that tune back to brenspeed. The first tune they sent me missed poped and banged at high rpms in 3rd gear so did the second.I went back to dougs tune (Bama chips) all is fine now.

DarkFireGT

I have a manual trans too. What I was trying to do is make it so that when I had the clutch in, it wouldn't rev over 2500, then when I popped it out on the last yellow, it'd go like hell. That way I could just have the go pedal floored the whole time.

Anyway, again I would try reloading your tune and checking your rev limiters, both neutral and in gear. Computers can be funny and sometimes just a simple reload of your tune can fix the problem.

StangRalle

I've never had any problems with Brenspeed tunes before and I also believe its not the tune as I described in my initial posting, it also happened with the stock tune and then I loaded the Brenspeed tune and both show the same symptoms.

StangRalle

Now I get you. Okay. I'll have a look at this, but honestly I don't think this is the solution to the problem.

If that would have been the case, it would not have been possible for me to accelerate at the German Autobahn like a maniac right after the dyno run.