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Volvo S40 T4 with Holset for 2011 season!!!


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arrtchiu wrote on Tue, 19 October 2010 08:05

What made you choose hx35? I ask as I'm currently debating turbo choice myself
Wink

Edit: What about hx40 with smaller turbine housing?

Tcode has N/A intake cam and stock T4 exhaust cam.

Hx35 is fast spooling and great for maximum 500hp and also prize is cheap about 700euros. Comperssor size is the main point with turbine a/r what effects spool so hx40 is late spooling even with small turbine. Also small turbines are not good for high rpm n/a like power with flat torque and nice power. So i dont like to mix small turbines with big compressors.

So Hx35 was best match for me. Razz

Here is compressor chart for my hx35super turbo and my turbo is with bigger turbine side than in this picture 8#->12# and exhaust side is also bigger 55mm->60mm.

http://www.turbotekniikka.fi/images/stories/superhx35_2.jpg

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vulvas40t4 wrote on Tue, 19 October 2010 07:28

Hx35 is fast spooling and great for maximum 500hp and also prize is cheap about 700euros. Comperssor size is the main point with turbine a/r what effects spool so hx40 is late spooling even with small turbine. Also small turbines are not good for high rpm n/a like power with flat torque and nice power. So i dont like to mix small turbines with big compressors.

So Hx35 was best match for me.
Razz

I'm having 0,1b@1800, 0,7b@3500 1,7@3700 2b@38xx rpm, and personally I doubt you will ever see those figures with HX35 turbo. But yes, it's cheap compared to the GT30 Very Happy.

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tcode wrote on Tue, 19 October 2010 09:55

vulvas40t4 wrote on Tue, 19 October 2010 07:28

Hx35 is fast spooling and great for maximum 500hp and also prize is cheap about 700euros. Comperssor size is the main point with turbine a/r what effects spool so hx40 is late spooling even with small turbine. Also small turbines are not good for high rpm n/a like power with flat torque and nice power. So i dont like to mix small turbines with big compressors.

So Hx35 was best match for me.
Razz

I'm having 0,1b@1800, 0,7b@3500 1,7@3700 2b@38xx rpm, and personally I doubt you will ever see those figures with HX35 turbo. But yes, it's cheap compared to the GT30 Very Happy.

Yes 2.0bar should be about 4500rpm with hx35. Hx35 is also bigger turbo than gt3071. Compare compressor maps. About 10lbs more juice in hx35 than gt3071...

http://www.turbobygarrett.com/turbobygarrett/images/catalog/Turbochargers/gt30_images/GT3071R_comp_e.jpg

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vulvas40t4 wrote on Tue, 19 October 2010 09:48

tcode wrote on Tue, 19 October 2010 09:55
vulvas40t4 wrote on Tue, 19 October 2010 07:28

Hx35 is fast spooling and great for maximum 500hp and also prize is cheap about 700euros. Comperssor size is the main point with turbine a/r what effects spool so hx40 is late spooling even with small turbine. Also small turbines are not good for high rpm n/a like power with flat torque and nice power. So i dont like to mix small turbines with big compressors.

So Hx35 was best match for me.
Razz

I'm having 0,1b@1800, 0,7b@3500 1,7@3700 2b@38xx rpm, and personally I doubt you will ever see those figures with HX35 turbo. But yes, it's cheap compared to the GT30 Very Happy.

Yes 2.0bar should be about 4500rpm with hx35. Hx35 is also bigger turbo than gt3071. Compare compressor maps. About 10lbs more juice in hx35 than gt3071...

http://www.turbobygarrett.com/turbobygarrett/images/catalog/Turbochargers/gt30_images/GT3071R_comp_e.jpg

HX35 will flow more air, no doubt. But you'll sacrifice almost 1000 rpm in a midrange, meaning your car won't be very nice as a daily driver. Also, my car spinning both wheels at 200 km/h at the wet road. What will your do with 100+ HP more, flying Laughing?

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tcode wrote on Tue, 19 October 2010 10:55

HX35 will flow more air, no doubt. But you'll sacrifice almost 1000 rpm in a midrange, meaning your car won't be very nice as a daily driver. Also, my car spinning both wheels at 200 km/h at the wet road. What will your do with 100+ HP more, flying
Laughing
?

True under 4000rpm gt3071 would be better choice. But i wanted to have turbo which has still more potential if needed. Razz

Every turbo is compromise. Also normal driving is still okay even with N/A power and i have no need to accelerate with 5.gear in slow speeds. I think that hx35 is best compromise for me. Cool

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Sute wrote on Tue, 19 October 2010 19:48

Guys..you have forgotten some basic principles regarding small Volvo engine:

Big turbo, huge lag = lots of power

Small turbo, less lag = less power

Very HappyVery HappyVery Happy

No doubt about that!

Though some of us prefer to have big power by 6000, not spool Very Happy

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