3.3TT Waiting for Full boost....

[Mr Skillet]

Hey guys, I've had the gt2 for about a month now, putting about 1k miles between local and highway commuting. I've noticed something that bugs me a little. Much of the marketing materials claim that the 3.3T motor can generate full boost and torque at "As low as 1300RPM" However, looking at most of the dyno charts floating around the interweb, I've noticed that most of charts show full torque not coming in until shortly after 2.5k RPM. I'm attaching a Dyno sheet from Tork Motorsports as an example, but sheets from several other tuners show the same thing. The butt dyno also confirms that much much happens under 2k, and torque build sharply from 2000 rpm to about 2500 rpm, then its full steam ahead.

Is this just exaggerated marketing on Kia's part, or am I way off base?

 

[Sabz]

For your muffler delete did you simply remove mufflers with nothing in place?

 

[Mr Skillet]

For your muffler delete did you simply remove mufflers with nothing in place?

Not my car, I believe this was when tork was doing R&D for their shop car.

 

[Kazz]

The first question is whether the dyno/car operator is flooring the car early enough to drive up to full numbers by 1500. Videos seem to show a slow roll until, say, 1500, and then floor it. Just a thought!

 

[TwistedOrca]

@Mr Skillet ...good point here, interested.

 

[Mr Skillet]

The first question is whether the dyno/car operator is flooring the car early enough to drive up to full numbers by 1500. Videos seem to show a slow roll until, say, 1500, and then floor it. Just a thought!

a google search shows a number of other dyno sheets that have very similar looking curves <3000 RPM. Having not dynoed my car, I can't guarantee operator technique, but I'm going to make an educated assumption that this isn't a driver issue.

 

[Kamauxx]

I don't think anyone is going full throttle from a stop on a dyno. There won't be any dyno sheets that show instant torque unless someone just flat out gasses the car from 0.

 

[eflyguy]

It's exactly that.

On a dyno, you're typically in 3rd or 4th, and "rolling" at a speed that is above idle. Repeated tests from standstill would be very hard on the transmission and, of course, you don't want to have it shifting.

Same with motorycles..

(skip to 50s)

(my '07 FZ1)

For reference - mine was up on photobucket, and we all know how that went..

.. a few years later, he was able to hack the ECU, and make even more improvements (note the red line increase) -

This is a 998cc, normally aspirated (fuel injected), 4-cylinder. Bike weighs around 450lbs.

 

[Rufus]

Hey guys, I've had the gt2 for about a month now, putting about 1k miles between local and highway commuting. I've noticed something that bugs me a little. Much of the marketing materials claim that the 3.3T motor can generate full boost and torque at "As low as 1300RPM" However, looking at most of the dyno charts floating around the interweb, I've noticed that most of charts show full torque not coming in until shortly after 2.5k RPM. I'm attaching a Dyno sheet from Tork Motorsports as an example, but sheets from several other tuners show the same thing. The butt dyno also confirms that much much happens under 2k, and torque build sharply from 2000 rpm to about 2500 rpm, then its full steam ahead.

Is this just exaggeratedView attachment 10461 marketing on Kia's part, or am I way off base?

I'd say it's more carefully worded advertising--- note the "as low as" disclaimer. Kinda like lease payments "as low as $99"

 

[Jeff]

When you go on a dyno, the mechanic drive it in a gear that is near 1:1 ratio. Wich is the 5th gear on a Stinger. When you drive a car in the 5th gear at 1500rpm, let me tell you , you do not push it WOT, you push slowly the accelerator to WOT . That's why you get those numbers.

 

[Mr Skillet]

When you go on a dyno, the mechanic drive it in a gear that is near 1:1 ratio. Wich is the 5th gear on a Stinger. When you drive a car in the 5th gear at 1500rpm, let me tell you , you do not push it WOT, you push slowly the accelerator to WOT . That's why you get those numbers.

Undrestood, did some further testing in manual mode, forcing higher gears in manual mode and adding moderate throttle, I was able to generate some meaningful boost and thrust after quite of bit of lag. This makes sense since these are single scroll turbos each being spung up by 3 cylinders. After about 2k rpm, everything wakes up and it actually feels like a n/a v8.