XHP Reviews and Feedback!

[Dr. Supra]

I got my MHD Orange Wi-Fi adapter and flashed my car yesterday with the Stage 3 config and no other customizations. Was able to take it for a short drive - only around 30mins before the rain moved in - to see what difference it made... and holy hell. It makes a significant difference in how fast the ZF8 transmission upshifts and downshifts in Manual mode. It sounds different too. It's definitely "rougher" shifting, but that's what I would expect based on goals of this product. So far, I'm very happy for the difficulty and cost of this mod, and I'm looking forward to it being updated continuously and only getting better.

What are some common values people are changing while using the "Stage 3" setup and why are you changing them?

On stock turbo, changed the shift points to 6300rpms.

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[jorgerendonjr]

On stock turbo, changed the shift points to 6300rpms.

what were the shift points on stage 2?

 

[recnepssirhc]

On stock turbo, changed the shift points to 6300rpms.

What is the reason for this? Guessing stock turbo just runs out of steam and power starts to drop off at that point?

 

[suicidaleggroll]

What is the reason for this? Guessing stock turbo just runs out of steam and power starts to drop off at that point?

Here's a typical stage 2 Supra (red curve):

https://www.supramkv.com/attachments/116018576_10223923560464001_9077036699959649122_o-jpg.28602/

The goal is to maximize power, which means keeping the car around that hump at 6000 RPM. We have a very tight ratio transmission, which means it only drops maybe 1000 RPM when shifting. This means in order to keep it centered on that hump, you'd want to shift at about 6500 so it falls down to 5500 in the next gear. If you shift at 7000 and drop to 6000, you'll be spending all of your time above the meat of the powerband.

 

[zrk]

On stock turbo, changed the shift points to 6300rpms.

That's -really- high. Stock turbo is dead at ~5700.

 

[suicidaleggroll]

That's -really- high. Stock turbo is dead at ~5700.

Depends on mods and the tune. For people running E50/meth you're right, the stock turbo just can't keep up with those boost levels up top and the peak is at more like 53-5500 RPM, so you probably want to be shifting before 6k. For basic stage 1-2 on 93 octane it can hold out higher though. The best idea would be to dyno your car to see what the powerband looks like and set the shift points appropriately.

 

[AHP]

RE: Shift points -- No tangible MPH difference (for me) shifting at 5900 vs 6300. IATs and other external factors are significantly more influential than a few hundred RPM difference in shift points.

Okay… latest update and latest maps 1.1.

my trans reverts to stock tune when VSC is off completely. What’s up?

Can one of the Beta testers advise if/when this is corrected? The first thing I do is turn all of that crap completely off.

 

[zrk]

Depends on mods and the tune. For people running E50/meth you're right, the stock turbo just can't keep up with those boost levels up top and the peak is at more like 53-5500 RPM, so you probably want to be shifting before 6k. For basic stage 1-2 on 93 octane it can hold out higher though. The best idea would be to dyno your car to see what the powerband looks like and set the shift points appropriately.

The compressor maps disagree. https://www.borgwarner.com/matchbot...wts=400&pt6_wd=83&pt6_wd2=74&pt6_wrsin=92044&

 

[zrk]

RE: Shift points -- No tangible MPH difference (for me) shifting at 5900 vs 6300.

It's interesting, I definitely gain MPH ~5900 (hitting the shifter a few hundred RPM earlier, hit shifter ~5600, so by the time brain presses it 5700, so the actual shift happens by 5900 or ~so).

 

[stormgreysupra]

It's interesting, I definitely gain MPH ~5900 (hitting the shifter a few hundred RPM earlier, hit shifter ~5600, so by the time brain presses it 5700, so the actual shift happens by 5900 or ~so).

So are you able to set these custom shiftpoints both in normal and sport mode?

 

[suicidaleggroll]

The compressor maps disagree. https://www.borgwarner.com/matchbot...wts=400&pt6_wd=83&pt6_wd2=74&pt6_wrsin=92044&

Theory vs practice. Analyzing compressor maps is great when planning out a build, but there are way too many unknowns and estimates for it to match reality 100%. You never know the true answer until you strap the end result to a dyno and measure it.

 

[zrk]

So are you able to set these custom shiftpoints both in normal and sport mode?

No idea. Haven't flashed the trans.

 

[underdonk]

No idea. Haven't flashed the trans.

What are waiting for? Mine didn't blow up after 30mins of driving.

 

[zrk]

Theory vs practice. Analyzing compressor maps is great when planning out a build, but there are way too many unknowns and estimates for it to match reality 100%. You never know the true answer until you strap the end result to a dyno and measure it.

Sure- but the math is generally right (manufacturing variances aside). Nearly any dyno curve is going to show the stock turbo dead in the water at ~1.7bar and also dead around 5700+ RPMSs.

The one you posted above follows this nearly to a T.

 

[suicidaleggroll]

Sure- but the math is generally right (manufacturing variances aside). Nearly any dyno curve is going to show the stock turbo dead in the water at ~1.7bar and also dead around 5700+ RPMSs.

The one you posted above follows this nearly to a T.

Peaking at 5700 is not the same thing as dead at 5700. You don't shift at the peak, you shift after the peak in order to maximize the power under the curve.

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