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Old 10-02-2014, 02:11 AM   #29
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It could be a number of things but the fact that he can't tell any difference when he is driving is the one that puzzles me most.

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Could it just be that the P&L header requires slightly different cam tuning to produce max torque accross all rpm?
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Old 10-02-2014, 02:20 AM   #30
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Could it just be that the P&L header requires slightly different cam tuning to produce max torque accross all rpm?
I would expect stuff like this would be more likely to pop up with all the different UEL header lengths. EL is EL, shouldn't matter so much if it's long or short tube I would think.
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Old 10-02-2014, 02:21 AM   #31
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It could be a number of things but the fact that he can't tell any difference when he is driving is the one that puzzles me most.
I'll go for a spin tomorrow and take it easy, I've been punching it from 4th to 5th so there might be a chance I completely miss this area of dip. The car is too fun, can you blame me?

Hypothetically speaking though...is it even possible to miss that dip if I'm driving at higher RPM's?

If the dyno claims it dipped in 5th, then I should be able to replicate it from 4000rpms and upwards, right?

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Old 10-02-2014, 02:28 AM   #32
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I would think you should be able to feel it in 3rd and 4th easily, maybe even 2nd. Your right that it's possible you always drive around it, just like you can drive around the torque dip.
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Old 10-02-2014, 03:41 AM   #33
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I'll echo the above, the drop is far more sever than the stock dip, it would feel like the car hesitates every time you run through it. You would notice it.


Did you flash the tune immediately before hitting the dyno? Any chance the LTFT hadn't settled, causing a lean situation and possible knock correction to occur? That could cause a drop similar to that.
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Old 10-02-2014, 03:50 AM   #34
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I'll echo the above, the drop is far more sever than the stock dip, it would feel like the car hesitates every time you run through it. You would notice it.


Did you flash the tune immediately before hitting the dyno? Any chance the LTFT hadn't settled, causing a lean situation and possible knock correction to occur? That could cause a drop similar to that.
I haven't touched the tune ever since the v.2.0 beta maps were released. I'm a bit dated compared to 2.061

I'll report back tomorrow after my commute to work

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Old 10-02-2014, 04:12 AM   #35
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Just saw this thread now... That torque dip you show should be very noticeable when driving, that's worse than the stock dip..... Curious to see results of this. I am OFT stage 2 uel. Love it!
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Old 10-02-2014, 04:17 AM   #36
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I recognise that, it looks identical to the TC interventions I used to get on my Elise.
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Old 10-02-2014, 04:20 AM   #37
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Ooo nice observation.
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Old 10-02-2014, 05:53 AM   #38
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Quote:
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....also 205 crank can probably be hit with stock car and filter
yeah, I thought the same thing. That stock the it made ~200hp at the crank -15% to the wheels.

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Could it just be that the P&L header requires slightly different cam tuning to produce max torque accross all rpm?
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I would expect stuff like this would be more likely to pop up with all the different UEL header lengths. EL is EL, shouldn't matter so much if it's long or short tube I would think.
Would it being catted make a difference? I don't know what header shiv was using to create his EL tune, but I know the UEL was based off the OFH which has no cat.
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Old 10-02-2014, 06:40 AM   #39
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Im sure he meant to say at the wheels.
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Old 10-02-2014, 10:08 AM   #40
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I know this is an older tune, but I can still feel it on the newest maps(It's not as bad, but still there). I had somewhat the same issue around 4500rpm. WOT the car would just stop accelerating for a bit, then keep going. Datazip WOT Log

at 4500 rpm (Almost on the dot) you can see the rpm's stagnate, then pick back up. This happens more often in 5th and 6th gear. Even this is extremely noticeable; so I would assume if the car dropped as the dyno showed, he would notice it.
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Old 10-02-2014, 10:39 AM   #41
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Am i the only one who looks at that and thinks its just timing being pulled and then ramped back in? Thats how it looks on LS powered cars. In a perfect world that part of the timing map would be fixed but isnt this an off the shelf canned tune in a holy crap epic amount of load that you'd never actually subject the car to?
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Old 10-02-2014, 11:04 AM   #42
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If it was an extended pull the load on the engine is higher, and it's possible that this increased load is causing some knock at that RPM / Load.
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