JDL V2 EL Header...Revisited and Revised

[Lee@JDLAutoDesign]

Originally Posted by Dimman

Could you run several steady simulations at different velocities/runner and view them sequentially? Animating them, so to speak.

What exactly can you do with that program, btw?

I could do something like that, and what you would end up seeing is something that looks like a pulse jet oscillator. Basically, the flow would always be turning toward the cylinder that was not exhausting, so over time you would see the flow "wave" up and down. I had a certain video in mind to share but I'm not finding it online... will edit this post if I find it.

As to what the code can do... I wrote the initial version of the CFD solver and grid generator when I was in grad school to solve super sonic flow over wedge shape airfoils. I've been expanding the code's capabilities ever since. I'm guessing that most people are not so interested in the technical details of the CFD modeling, so if it's okay with you I can PM you and fill you in so as not to derail this thread. However, if people actually ARE interested, I would be happy to share, so please feel free to chime in.

Turdinator - Here is a quick first order guess for the harmonic layout of this header, based on the average runner length and an assumed exhaust gas temperature. Please understand that this is only an approximation (due to many factors), and you shouldn't expect "discrete" benefits. By that I mean, you shouldn't expect a benefit at exactly 6448.972 RPM... but you might expect a benefit from ~6200-6800. Also, keep in mind that some of the harmonic energy is lost with each shock reflection, so higher order harmonics will provide less of a benefit than low order harmonics. This is another reason I'd like to FFT an exhaust signal, because if the stars align and the data/sampling is good you ~should be able to pick up the variation in strength with each harmonic.

The idea (or hope) here is that the second and third harmonic... from which you should expect noticeable benefits... should provide a pretty nice torque curve based on their placement and spacing. I'm really interested to see how it tests; either way we will learn something

[Turdinator]

Originally Posted by Lee@JDLAutoDesign

Turdinator - Here is a quick first order guess for the harmonic layout of this header, based on the average runner length and an assumed exhaust gas temperature. Please understand that this is only an approximation (due to many factors), and you shouldn't expect "discrete" benefits. By that I mean, you shouldn't expect a benefit at exactly 6448.972 RPM... but you might expect a benefit from ~6200-6800. Also, keep in mind that some of the harmonic energy is lost with each shock reflection, so higher order harmonics will provide less of a benefit than low order harmonics. This is another reason I'd like to FFT an exhaust signal, because if the stars align and the data/sampling is good you ~should be able to pick up the variation in strength with each harmonic.

The idea (or hope) here is that the second and third harmonic... from which you should expect noticeable benefits... should provide a pretty nice torque curve based on their placement and spacing. I'm really interested to see how it tests; either way we will learn something

Awesome! I appreciate that there will be some variation between theory and practice so I can't wait to see the dynos.

As an aside (and I can't talk for everybody of course) I much prefer it when people like yourself who clearly know what they're talking about keep the dumbing down to a minimum. Us plebs can always ask questions or do our own research do figure out what you are discussing.
Keep up the good work

[JDLAutoDesign]

Final shots of the V2 EL

[JDLAutoDesign]

Originally Posted by RiskyTrousers

@Lee@JDLAutoDesign

Any idea when my EL header replacement will ship? I was promised a replacement September/October. It was requested in August. Why so long?

Coater will have an exact date for completion of your header tomorrow

[slava]

Dyno dyno dyno!

[xDanger_208x]

Hurry and send mine and I'll get it on the rollers asap! ;-)

[JDLAutoDesign]

We have 4 going out so im sure we will have some dynos really soon

[xDanger_208x]

Originally Posted by JDLAutoDesign

We have 4 going out so im sure we will have some dynos really soon

Does one of those have an overpipe/catted front pipe going with it... all Vband??? ;-)

[xDanger_208x]

Any idea of completion time? I've sent 2 e-mails over the past 2 weeks.. no response.

[xDanger_208x]

I'm getting quite concerned at the lack of response from your company. On this forum.. and especially emails.

[JDLAutoDesign]

Hey guys sorry we were closed for the holidays and as soon as we got back in we got to work on FT orders. Over Pipes & Front Pipes are built for the combos on order. 15 FT86 UEL/EL collectors are build and are being ported. Most are ready for assembly and welding including 1 Vband EL header OVP & FP Combo ( Shane ). These will start shipping by the middle as next week as they get completed. Tracking will be emailed to each of you as it goes.

2 warranty headers are at the coaters and we have been hounding him to get them asap as we have patient customers


Im still going through emails and voicemails from our break so bear with me as we get to them. You will also be pleased to here we also have a 3rd welder staring here on the 20th so that will eliminate any more wait time once we get these 15 taken care of. Sorry for the lack of posts, ive been away from the comp doing a million things here but you all are our main priority.

Ronnie

[xDanger_208x]

Excellent! Thanks so much for the response. Getting anxious as hell!

[DAN_BRZ]

moar info!!! anyone have one of these babies in the wild yet? dynos?!?!

[JerryMichaels7]

Did you guys not go through with production on the catback?? I seen the picture in your other thread but that was all I have seen/heard of it.