Hi there,

Fitted an IHI VL38 Turbo off an Alfa Mito 155, very pleased with the results but a few questions..

I think this is the same turbo as off the T-Jet 150 is that correct? Because I thought the VL36 was off the Abarth 500.

My car seems to go very well and has some performance behind it now. I have a scangauge2 which reads my MAP sensor and is telling me that the turbo boosts like so;

2000-3000 RPM - 19 PSI

4000-5000 RPM overboosts to 21-22 PSI

Then tails back down to 19 PSI before the rev line.

These numbers seem high, does anyone know the typical boost levels on the 1.4 T-Jet 150??



My car in unmapped but has responded well to the VL38 Turbo... can't wait till it's mapped!

Any help much appreciated.



EDIT: The turbo seems louder, is this a characteristic of the larger VL38 vs VL37?

Keep in mind that the ScanGauge will only display up to 155kPa (ie ~1.5bar = 21-22psi) of boost due to technical limitations of the "MAP" PID in OBD-II.

So, technically it could be boosting higher?

Hi Rob. I have a tjet 150 with stock turbo ihi vl36. It is definitely vl36 as it is marked on the plate on turbo. Did the vl38 bolt directly on with no modifications? Also is there more turbo lag? Would love to do the same and then retune. Is it the turbo off the Mito QV?

Bravo 150 and Mito 155 share the same VL36 turbo. Abarth 135 use VL38.
So what was the point to throw in smaller turbo?:bang:

Unless its a hybrid based on VL38?

Checked on my friends Mito QV 170hp. It has a Garrett turbo. Is the vl38 only on the Abarth 135?

I have the vl36 on my grande punto t-jet which came off a abarth grande punto.
Its louder than the vl37 was but i put that down to the larger compressor wheels. Sounds more like a turbo now

With the vl37 it only use to boost to 10psi (if that) but once mapped it boosts to 15psi standard and 20 - 22 on over boost.

RobBravo said:

So, technically it could be boosting higher?

Click to expand...

Sorry, I missed your previous reply. Yes, if the Scangauge shows 250 or more, it could very well be above that. Pegged at 255 is an really good indication that it is higher than 1.55bar.

I can assure everyone it's a VL38 off a Alfa Mito 155

I'm currently get MAP readings starting off at 23 PSI, increasing to 25 PSI before tailing down to 21-22 PSI. Seeing as how 14 PSI is standard atmospheric pressure that means that...

Boosts initially at 9 PSI

Overboosts at 11 PSI

Tails off to 7 PSI

Does that seem correct?

RobBravo said:

I can assure everyone it's a VL38 off a Alfa Mito 155

I'm currently get MAP readings starting off at 23 PSI, increasing to 25 PSI before tailing down to 21-22 PSI. Seeing as how 14 PSI is standard atmospheric pressure that means that...

Boosts initially at 9 PSI

Overboosts at 11 PSI

Tails off to 7 PSI

Does that seem correct?

Click to expand...

Thats what the standard 120 tjets boost at, yes!

U should go to a dyno to see if it has made more power since turbo swop, and then once remapped or custom tuned.