New turbo core has arrived

yes I am on a a stock map.

I do need to wind my wastegate back a bit. Gauge had me hitting 20psi when I put the boot into it which was probably only 3/4 to the floor.

My ass based Dyno is a little out of calibration, as I went back to 32" tyres the day before I fitted the core. So there is a bit much to process. Plus my speedo is out, so I don't have an accurate sense of speed.

That being said, I reckon there is a change to the exhaust note. When I removed the centre muffler, I got quite a pronounced whine when you revved it. This seems to have gone slightly, if anything it does sound a bit more throaty. I guess unfortunately sound doesn't equate to torque/power.

But there doesn't seem to be much of a noticeable drop in performance if any from going to the bigger tyres.

Interested to hear your thoughts on it.

Quote:

---

Originally Posted by clintooo

yes I am on a a stock map.

I do need to wind my wastegate back a bit. Gauge had me hitting 20psi when I put the boot into it which was probably only 3/4 to the floor.

My ass based Dyno is a little out of calibration, as I went back to 32" tyres the day before I fitted the core. So there is a bit much to process. Plus my speedo is out, so I don't have an accurate sense of speed.

That being said, I reckon there is a change to the exhaust note. When I removed the centre muffler, I got quite a pronounced whine when you revved it. This seems to have gone slightly, if anything it does sound a bit more throaty. I guess unfortunately sound doesn't equate to torque/power.

But there doesn't seem to be much of a noticeable drop in performance if any from going to the bigger tyres.

Interested to hear your thoughts on it.

---

I was mainly interested in how it was spooling up.
Kelvo's log look pretty impressive in that regard but that will be due to the remap and manual trans..

Your logs show less of the early spool that was present in kelvo's log.
However there are much higher boost levels vs a stock turbo in the 1950 - 2300 rpm range.

That is peak torque range so despite the comments that "it's not a real hybrid" from Jose it looks like its going to be pretty useful, especially if it's teamed up with a remap that takes advantage of the extra air in that range.

This is a scatter plot of RPM vs boost (MAP - AAP) from your log.

Attachment 128973

And this is some testing I was doing a few days ago with stock turbo. Wastegate is set stock and I was just messing around with the tables controlling some aspects of the WGM.

Attachment 128974

You can clearly see the higher boost levels below 2350rpm with the hybrid CHRA.
Unfortunately I won't be able to install for a few weeks, but should be interesting.

Thanks for the data OffTrack, has Kelvo posted his log anywhere? While that scatter plot does show more boost earlier it is all over the shop compared to the stock setup.

Does anyone have a clearer graph or raw data in a .csv file they could lend me to analyse?

Quote:

---

Originally Posted by Jazzman

Thanks for the data OffTrack, has Kelvo posted his log anywhere? While that scatter plot does show more boost earlier it is all over the shop compared to the stock setup.

Does anyone have a clearer graph or raw data in a .csv file they could lend me to analyse?

---

I posted it on another Forum [bigwhistle]

But I'll post it here as well [biggrin]

Quote:

---

Originally Posted by kelvo

I posted it on another Forum [bigwhistle]

But I'll post it here as well [biggrin]

---

Awesome. Thanks for the data, i might have to remember how to calculate statistics with only median values to get a chart as clear as I was hoping for. But i'm getting a clearer image in my brain.

Is this data before the new CHRA was fitted?

Quote:

---

Originally Posted by Jazzman

Is this data before the new CHRA was fitted?

---

No, this is after the new CHRA was fitted.

2003 manual D2a (15P engine 280,000Km), Td5inside map, allisport intercooler, no cat and egr blanked.

Quote:

---

Originally Posted by kelvo

No, this is after the new CHRA was fitted.

2003 manual D2a (15P engine 280,000Km), Td5inside map, allisport intercooler, no cat and egr blanked.

---

I've managed to smooth out the boost values to get a clear idea of what the boost is doing as a result of RPM. I've converted it to PSI as most people relate to PSI vs RPM.

All I need now is someones standard turbo data. I guess i'll have to get that myself, in fact it might be a better comparison as mine also has a remap but standard turbo. Although it is auto.

Quote:

---

Originally Posted by Jazzman

I've managed to smooth out the boost values to get a clear idea of what the boost is doing as a result of RPM. I've converted it to PSI as most people relate to PSI vs RPM.

---

While that graph looks great, the formula i used is not correct. So this graph it no good. Only worked it out when I had my data with std turbo. Still working on a comparison.

It would be much simpler if I had some data from a straight run on a flat bit of road from 0 to 100km/h (or faster [bigwhistle]). This way i'd have linear data to use.

Quote:

---

Originally Posted by Jazzman

While that graph looks great, the formula i used is not correct. So this graph it no good. Only worked it out when I had my data with std turbo. Still working on a comparison.

It would be much simpler if I had some data from a straight run on a flat bit of road from 0 to 100km/h (or faster [bigwhistle]). This way i'd have linear data to use.

---

The main issue is there is no causal relationship between boost and rpm, so you can't determine boost from rpm or vice versa.
Boost is dependent on engine load, which is related to rpm and throttle position through the driver demand maps.

You can see this in kelvo's log data where the regions that show rpm moving in a +/-100 range but boost moves between 30kpa and 90kpa (5 and 13 psi ). This is basically what happens when you are sitting on a speed limit, adjusting the throttle to maintain a set speed. If you hit a hill you need more throttle and therefore more boost to maintain a set rpm and roadspeed.

It is far more obvious with manuals, but once the TC is locked same thing occurs with auto's.

This is kelvo's log data with steady speed regions indicated.

Attachment 129450

The two 70kmh regions will reflect two different gears - 4th and 5th most likely.

Scatter plots are very useful for finding patterns in data.