Bump for @moto-mike , ran into him the other day with whom I believe was @Simmons testing Simmons JDL UEL and mikes e85 tune.

Btw while I was driving away, Simmons exhaust was retardo loud, no wonder he got a ticket.

Yeah, it's loud ;)

Don't worry, the TIG machine has been kept warm for Mr Simmons, we should have about 12 lbs or so worth of sound reduction to replace the much heavier yet loud cat back...

Otherwise the VOD has been eliminated as far as I'm concerned. Once the bottleneck (header) is changed, and we then tune for it, there is no more Valley of Death, and the top-end is maintained. You can see the dyno in the JDL thread, but that was from a tuned to a more tuned file. Once we get the 93 octane car the header we'll do the proper testing of stock, header only, tune only, header + tune to evaluate all. Then we may stick an exhaust or intake on after that, just want to make sure we have every variant of tunes for the folks who want to stay a bit more stock. I have a feeling a stock exhaust/intake but with header/tune combo, is going to do well here.

Sweet any idea on when we can expect that? ;D

I can't wait to get my P&L header on and let you work your magic.

good questions, I think there were a few folks in line before I put the payment down

Indeed, stop on by :) We'll be dynoing again next tuesday @ Nazareth, but it sounds like all the header folks are quite busy so I doubt you'll get it by then!

Tell me more about this. I was contemplating JDL header and stock exhaust but I was told I should look into a resonated exhaust to "free up the flow". I didn't think the stock exhaust was all that restrictive. My end game is to have the most power with the least noise.

The verdict is out on the stock exhaust.

Having looked at the stock setup, one has to question the balance of velocity vs flow. The stock overpipe looks awful when you first look at it, but the design actually has many benefits for keeping exhaust velocity. Now, what happens when you put a catless header with a 2.5 output on it? That's the big "IF"

The stock front pipe (cat/hemholtz) actually terminates to a 2.5 outlet. The current prototype exhaust (not for mass production) is utilizing that. It will allow us to test both the stock overpipe/front pipe combo with stock or our 2.5" cat back, vs an aftermarket 2.5 overpipe/front pipe with a 2.5 cat back.

This should yield good info as to where exactly the choke point is, and what is most beneficial when it comes to flow vs exhaust velocity. Then we can play with overlap and other tuning aspects to see what creates the "wall" of inefficiency/cylinder filling 3500-4200 RPM...and thus come up with a perfectly sized/mated exhaust for a header.

Mike it sounds like I should play the waiting game a bit if I wanna get the most bang for my deer. I'm really hoping I can get away with adding a header, getting reasonable power, and simultaneously not making my car sound ridiculous.

Bump for @moto-mike for excellent customer service and 12am-4am vortech tune... Piss poor planning on my part, but he still came out and saved my ass.

No kidding field service at it's best ;)

Now to get the deer jerky from out under my MX-5...

Mike,

What if anything ahve you learned about oil temps and the cars HP? Have you seen the same issues as Perrin where HP drops after temps of about 220f ? How has that impacted your tuning?

There's a reason my cars name is "DEER!" I'm happy to find out its not just me... Btw I need a moto-east sticker to slap under my hood. Preferably not one that says MX-5 on it.

We added a new "feature" for those wanting the car to sound a little more mean. If you have straight pipes this will shoot flames out the back so consider yourself warned!

[ame="http://www.youtube.com/watch?v=oN9oltJNzeY"]Subaru BRZ with JDL Header, Perrin Front/Overpipe, Moto-East catback, Innovate SC In-car Sound - YouTube[/ame]

Also some more testing has been done with the Borla header. Not too bad at all at 191 WHP!

https://fbcdn-sphotos-g-a.akamaihd.n...56496599_o.jpg