Diablosport Forums

Good, not great.

http://www.youtube.com/watch?v=EXAsDMjOgPY

Car has a drop-in K&N filter in a Daytona airbox and a DiabloSport Predator tune (various, see below). About 35k miles and not much else.

Pass 1: Custom email tune: 297.77 hp, 335.14 tq and pig rich (11.49)
Pass 2: 91Octane CAI tune: 303.40 hp, 339.15 tq and closer (11.93)
Pass 3: STOCK tune: 297.93 hp, 330.99 tq and pig rich again (11.44)

So this just tells me that a tuner is only useful if you aren't stock or close to it. 6 horse off a $280 tuner (+ a custom email tune) isn't worth it. Dyno guy even asked if I'd be selling my tuner from my phone on the way home haha! Frustrating, but I'm ok with it in the end.

You should have run the regular 91 octane tune. The Daytona box isn't a CAI. The CAI tunes are for intakes with conical filters, that can actually lean out the mixture. A panel filter in a Daytona box won't do that.

Also, don't know who did your custom tune, but you should ask for a refund. A power loss over stock is inexcusable. You can't call yourself a tuner if your tunes don't make power. At that point you're just like me using a tuning package, a schmuck who's playing around, hoping for the best.

Mike_Levy wrote:You should have run the regular 91 octane tune. The Daytona box isn't a CAI. The CAI tunes are for intakes with conical filters, that can actually lean out the mixture. A panel filter in a Daytona box won't do that.

Also, don't know who did your custom tune, but you should ask for a refund. A power loss over stock is inexcusable. You can't call yourself a tuner if your tunes don't make power. At that point you're just like me using a tuning package, a schmuck who's playing around, hoping for the best.

If you choose to pay a pro to do something you can't do, and you don't like how it turned out, learn how to do it yourself or...

I just went outside and installed the 93 Octane tune, no CAI. I run 93 anyway, so why not? As I recall, I had a bit of knock with the 93 tune, but the car hauled ass. I'll run it for a bit and see how it goes. I didn't have a catch can before either so maybe that will calm the slight knock I had.

Now to send an email to the email tuner, see what we can work out.

if you are convinced that all the tuner does is show peak power numbers, then your 'tuner guy' is right, you should sell it

if you load the stock tune back and realize 'whoah, forget the peak numbers, the car feels terrible with the stock tune', then maybe your 'tuner guy' (who I dont think is a tuner ), was wrong....

peak numbers are the easy part of a tune. Really. Easy. So easy, I am not sure why your 'tuner guy' didn't use the incredibly capable handheld device to dial it in You could have seen what that car was truly capable of....

Oh I'm not taking his side by any means, but he's fairly reputable and apparently didn't think highly of my email tune. Since then, I was sent a new tune and it logs great like the previous tune did, but with a little less fuel. It should make the power the 91 CAI tune did (a 6 horse difference). I won't know until the next dyno or track day.

But for the commute and drivability, these tunes make an "experience" difference, even if the numbers aren't always there.