Near Stock v. OFT Stage 2 Dyno

[Triumphrider]

Everytime I've flashed the car it's taken a couple hrs of driving before everything is sorted. I don't think It's am instantaneous change like some think

[DarkSunrise]

Originally Posted by wootwoot

Lol... So much butt is hurt in this thread its hilarious....

Why would you not contact Shiv before doing anything else? I would have called him from the Dyno. He stands behind what he does and will sort this out, but at least give the guy a chance before you make a public thread bashing his livelihood.... Damn.

Also, the area under the curve looks like you picked up good power to me.

Yeah the point of this thread wasn't to bash anyone. I actually listed some possible explanations for what was going on if you read my first post. I'm just reporting what happened and seeing if people had any thoughts. I tagged Shiv to see if he knew what was going on.

To be clear, it looks like I lost power from 2700-3700 RPM and from 5000-6300 RPM. Again, not jumping to conclusions, just stating facts for now.

I'll pay (again) to re-dyno, and will update with results.

[phrosty]

Unless your fuel trims are wildly off, dynoing immediately after a flash should give representative. OFT OTS tunes start IAM at 1.

How much time went by between the runs? Same temps?

[wparsons]

Originally Posted by phrosty

Unless your fuel trims are wildly off, dynoing immediately after a flash should give representative. OFT OTS tunes start IAM at 1.

How much time went by between the runs? Same temps?

I haven't flashed with the car hot, but I know after a flash when it's cold you need to give the car time to warm up before the VVT becomes active.

If the car cooled down (or if it needs time to adjust after the flash), it's possible the after dyno was done with the limp VVT tables active, which kills power.

[Roadcone]

i've never heard of having to wait for a tune to take effect... i'd flash it again and make sure you actually flashed the tune in the car....

[phrosty]

Originally Posted by wparsons

I haven't flashed with the car hot, but I know after a flash when it's cold you need to give the car time to warm up before the VVT becomes active.

If the car cooled down (or if it needs time to adjust after the flash), it's possible the after dyno was done with the limp VVT tables active, which kills power.

Indeed, I assumed anyone would wait for VVT . I meant you shouldn't need to put any miles onto the car prior to the dyno.

[DarkSunrise]

Originally Posted by phrosty

Unless your fuel trims are wildly off, dynoing immediately after a flash should give representative. OFT OTS tunes start IAM at 1.

How much time went by between the runs? Same temps?

About 2-3 hrs. Ambient temps were about the same.

I'm sure coolant temps had dropped during that time, but we did 3 runs post-flash. I would think by the 3rd run coolant temps would have stabilized, but who knows.

[Walla Walla]

Originally Posted by phrosty

Indeed, I assumed anyone would wait for VVT . I meant you shouldn't need to put any miles onto the car prior to the dyno.

and how do you expect to learn your fuel map closed loop to then apply them in open loop "dyno situation"?

yes, te ecu need a little time to re-learn...

[s2d4]

Originally Posted by drewbot

If you're WOT it's closed loop

Sent from my OnePlus One

Open Loop actually.

[Shiv@Openflash]

FWIW, just yesterday I tested a FRS (6AT) with only Grimmspeed intake on the dyno yesterday. Stock tune, it put down 171whp (as expected). With Stage 1 tune, it put down 177whp.

https://www.facebook.com/23343167667...type=1&theater

OP- You should be able to see bigger gains that what you saw when even running the stock tune. One thing I do remember about tuning a JDL header (their EL version) was that it needed a lot of runs (with very little cool down) to get up to temp. And each successive run would make 1-2hp more. I took 4 or 5 runs before it was up to temp and made peak power. This is because their headers are quite heavy (thick gauge material) and have a lot of thermal mass. This is the reason why heavy headers benefit from heat wrap or thermal coating. This is also the reason our own header uses thinner gauge material.

That said, I have never tested their UEL header so for all we know, it may have different mapping needs that other UEL headers that we've tested. Custom tuning would be the next natural step in this situation.

[s2d4]

op,

do you have logs of those runs?

[DarkSunrise]

Originally Posted by Shiv@Openflash

FWIW, just yesterday I tested a FRS (6AT) with only Grimmspeed intake on the dyno yesterday. Stock tune, it put down 171whp (as expected). With Stage 1 tune, it put down 177whp.

https://www.facebook.com/23343167667...type=1&theater

OP- You should be able to see bigger gains that what you saw when even running the stock tune. One thing I do remember about tuning a JDL header (their EL version) was that it needed a lot of runs (with very little cool down) to get up to temp. And each successive run would make 1-2hp more. I took 4 or 5 runs before it was up to temp and made peak power. This is because their headers are quite heavy (thick gauge material) and have a lot of thermal mass. And cold material slows down exhaust velocity.

That said, I have never tested their UEL header so for all we know, it may have different mapping needs that other UEL headers that we've tested.

Thanks, that makes sense. My header is also thermal coated, so that may affect things.

I'm pretty sure the tune file loaded properly since I haven't seen any CELs for removing the first cat, but to be safe, I'll try re-flashing.

[DarkSunrise]

Originally Posted by s2d4

op,

do you have logs of those runs?

Wasn't logging at the time unfortunately.

[Shiv@Openflash]

Originally Posted by DarkSunrise

Thanks, that makes sense. My header is also thermal coated, so that may affect things.

I'm pretty sure the tune file loaded properly since I haven't seen any CELs for removing the first cat, but to be safe, I'll try re-flashing.

By the looks of it (high higher, soft fuel cut), you have a tune file loaded. So I don't think that is the culprit. That header may just require custom tuning. Do you know if you were running a 93oct map or a 91oct map? The 93oct map, on 93oct, will make a few hp more.