[baggy798]

A standard 19t can hit 300bhp at around 20 psi.

Is it this Owens 19t? Looks like a nice unit.

https://ozvolvo.org/discussion/6582/...mhi-td04-64hta

Based on the 19t turbo, Owens modify this turbo to suit optimum power and torque from the TD04 units. This includes the following
64mm HTA billet alloy compressor wheel
Uprated 360 degree thrust bearing
Turbine blades cut back for enhanced performance
What that all means is the sudden boost onset is minimized as a result of the clipped turbine blades. Airflow is enhanced due to the upgraded compressor wheel and the 360 degree thrust bearing adds to the durability.

Owen claim that this turbo will suit applications up to 375 bhp. In my instance this turbo was producing around 350bhp, and 500Nm + torque at 4000rpm. Actual dyno HP read 310hp at the wheels. See image.

NOTE - You will need to fit a suitable Wastegate actuator as I utilized this elsewhere. You will also note that it has a Kinugawa CBV blow off valve attached. There is actually a thin blanking plate under this as I was using an aftermarket recirculating blow off valve.

Refer Owen Developments web page or further info. http://www.owendevelopments.co.uk/ar...Volvo_Upgrade/

https://web.archive.org/web/20210509...Volvo_Upgrade/

Which is why Owen Developments - Europe's leading high performance turbocharger specialist - has just launched an uprated MHI TD04 '19T' turbocharger for the Volvo 850 T5 / T5R.

Called the Owens MHI TD04 64HTA, the Volvo 850 T5 / T5R turbo is packed with state of the art technical features, including:-

64mm HTA billet alloy compressor wheel
Uprated 360 degree thrust bearing
Optional uprated actuator and Forge dump valve available
Turbine blades cut back for enhanced performance
Owen's use of a 64mm HTA billet alloy compressor wheel produces the perfect blend of boost response and flow, allied to a superior reliability thanks to the uprated 360 degree thrust bearing.

As standard the Volvo 850 T5 produces 225bhp and the T5R model 250bhp, but the Owens MHI TD04 64HTA is the perfect 'bolt-on' unit that's capable of up to a sensational 375bhp in conjunction with other engine modifications.

https://ovlov94blog.wordpress.com/20...-of-reckoning/

In the case of the Owen Developments Hybrid unit, it is modified in such a way to create a small amount of lag through impeller clipping, supporting an increased air flow in the upper rev range with a larger compressor wheel. This evens out the power delivery significantly and though the vehicle may not feel as fast as a result of the Kinugawa’s massive surge of boost, I am satisfied that the car is significantly quicker as a result of holding boost better and improved air flow into the upper rev range.

The Owen unit also utilizes a couple of other noteworthy features, particularly the change from journal bearing to ball bearing. This affects low end pick up noticeably and the car is far happier to pull in some boost in the lower rev range making it feel just that bit more responsive.

Back to the dyno results; the big surprise for me on the day was the torque figure, which was 550nm (406 ft lbs) @ 4000 rpm. I’m aware that the T5 engines produce excellent torque but was genuinely surprised at that level of performance. 4000rpm is a nice point to achieve max torque, not too low, saving the engine from being too heavily loaded too early, and not too high, making it effective in terms of performance driving.

Other valuable info gained on the day –

Duty cycle of the Bosch green injectors indicated that they were operating at 90%. This is I am told about as close as you want to push them to their limitations.
Dyno results were obtained @22.5 psi manifold pressure peaking at 4,250rpm.
AFR figures reported on the dyno were spot on with my AFR gauge which indicates that it’s running a little rich at WOT.
A small amount of detonation was reported but it was felt that slightly better quality 98 octane fuel would be enough to resolve this issue; apparently not all 98 fuel is the same.

Chart 1 Hp and Torque results – 300+ whp 5,000rpm to 6,500rpm, 550nm@4000rpm


Chart 3 Hp and Air Fuel Ratios – 10.5 to 11.0 from 4000rpm to 6,500rpm WOT