Thread: Holset HY35?

I was very tempted to get a HY35, but Coheed's GT3076 was just too good to pass!

Any results/dyno numbers with the HY35?

I hope it's not as laggy as the one on my truck. Especially on a motor less than half the size of the cummins 5.9.

the hx40 i have is bigger and i get full boost around 4500-5k rpms i start spooling this sucker around 3000, once you wake it up its an animal. the hy have a 9cm back housing which should spool way faster than me

This project is on hold for a while. I have an equal length twin scroll T4 mani now. Wanted to do a T3 flange on it but nobody seems to be up to the job. Is the HX40 a T4? I have a VE head now so the little extra lag won't be too bad.

i havent given too many details, i had a hx40 58mm 8 blade turbo (the smaller hx40) with a bep t3 .70ar housing. the car was a complete animal, i had it up to 26psi on the stock sr20de motor and it pulled like a rape ape, i didnt get a chance to dyno it but being in many other cars before i can tell you this is well over 400hp maybe even 500, i spun 4th gear from a dead roll on hoosier 25" radials as if it was nothing and the car spooled amazingly. Some say the 12cm housing spools better than the bep housing but the bep housing cleans the turbo up alot appearance wise.

once i got my map sorted out i barely had any spooling issues at all, it almost felt like my old greddy 18g setup very responsive, with a ve head if you set up the cams right you will not notice any bit of lag

unfortunately i broke the shaft in the turbo (very common problem with the holset hx40) and swapped it out for a precision sc61.

this is where i really realized that my holset was a much better turbo, psi for psi the sc61 never felt or pulled the same and i can tell by my logs that this turbo does not put out as much air simply because my map got much richer with this turbo, i had to pull fuel out every where. i was a bit disappointed

now im going to go with a hx52 to quench my boost needs because the sc61 is just not cutting it.

i say go for this turbo and dont listen to half of the people on this site. many of them comment negatively on things they never done or heard of any one doing and it really hinders the movement of our forum. if i listened to people on this forum i would have never discovered many of the things i know now. i have been playing with these holsets now for maybe 3 years and the biggest turbine housing that i used was a 16cm housing on a hx35 and the car spooled it with no problem it was a little bit laggier but no worst that a old 60-1 turbo.
i would never waste my time with any 2871r or anything like that if i were looking to make 400hp, yes they can make it, but your putting alot of stress on the turbo and the motor by doing so, a bigger turbo will make that sort of power with ease and leave you with alot of room to grow, many of my transmission issues and other issues went away when i stopped playing with small turbos.

well said...

question though... running a vvl oil pump would you use a restrictor with a hx35

Thanks for sharing that useful info. I agree with you on listening to everyone on here, it seems that nobody wants to try anything different. I've always wanted to go with a Holset turbo since reading about a budget build in a mag a few years ago. I'm hoping I can drill the flange on my manifold for T3 and starting off with the HY35 for now just to keep it light. I really feel like it will stomp out cars with overpriced ball bearing turbos.

Not HY35 info, but have some from HX35 setups...

A friend of mine has an HX35 on his Eclipse, running E85.
From a recent 3rd gear pull, data from DSMtuner/log -
20 psi by 3700 RPM, spike to 30psi @ 4100, held 26.5psi
to around 6500rpm shift.
350-380 lb-ft from 4000-5600, peak around 4800.
350-397hp from 5800-6500.

A friend of his has a twin scroll HX35 setup on E85.
511whp/469 lb-ft, full spool @ 3700, 30psi. Dyno here:

10.57 @ 128.96:

From personal experience with these turbos, particularly the HX40, I would say these turbos work very well with sr20 motors de or ve. When partnered with a vvl motor, high levels of horsepower become VERY achievable. I am talking power levels in excess of 400whp on as little as 14psi of boost.