turbochargers for 500hp

[Quattronaut]

Question was for race track. When he does hill running, he has to tell us so :-)

[bartolomeus]

I have a question. Maybe I'm silly. Why not ALS? That's the thing to have in motorsport?

[pasbogdan]

Question was for race track. When he does hill running, he has to tell us so :-)

Was looking at gtx3076r. But also thought about holset hx35?

Also been offered used gt3582r and gt3082r

thoughts on all these turbos. Looking for around the 500bhp mark on an aan engine with rods.

Thanks
nick

It was a general question.
@bartolomeus,you have an evo now and you start wandering about throttle response? It is instant.As it is in your octavia 3 rs 2.0.

[prj]

With GTX3076R we would probably see similar spool but more top end power.

No, you won't.


A bit better spool, but exactly the same power at the same boost (stated by the person who produced the graph). So the turbine does not flow any better.

As for holset… HX35S spool on bone standard 2.2T with a fairly quick ramp rate, full boost is at about 4k here. This is just a bit quicker ramp rate than with 3rd gear on the road. Power and torque is at the wheels, so 600nm at 4000 rpm, and 645nm peak, and power is about 550hp, but WMI helps a little here



If you compare quattro-nick's result on the same type of dyno:


The turbos spool in a similar way, the HX35S comes in a bit earlier (550nm vs 600nm @ 4000 rpm). The power figures is hard to compare without knowing the correction factor on the dyno used by quattro-nick, as the superflow here only gives wheel power.

[snp10]

It seems that the holset hx35 super has the same performances like a garrett gt3076r or gtx3076 , but garretts are more expensive.

Some people had complaints regard the response of the Holsets, but like Prj said, maybe due of wrong dimension of the hot side.

Can anybody provide us a dyno graphic with a Holset Hx 35/40 super ?

[afterburner]

A little offtopic... Not a 500hp turbo, but has anyone used a Holset HX30? The idea is to use it as a RS2 turbo substitute in a T3 form.

[quattro-nick]

@ prj
i believe the tuning guy said to me he converted whp to engine hp by adding 17% on whp
the dyno is almost new and told me that the measurement is very accurate

[prj]

Can anybody provide us a dyno graphic with a Holset Hx 35/40 super ?

It is not good, a lot of lag for the HP it makes. Capable of about 550hp, but spoolup is at 4400 rpm, making it much too laggy for my taste. The HX40 has a much thicker and heavier (stronger) shaft, but this also hurts spool time.

If you want more power, it is better to go HX40 Super, but then full boost is like a GT3582R, but it makes more power than a GT3582R. So about 4600 rpm, and 650+ capable.

Really, driving side by side two cars with HX35S and GT30R, there is virtually no difference. The HX35S has better initial spoolup, the GT30R has a fraction faster re-spool on gearchange.
But the HX35S costs less and is MUCH more reliable…

I have a friend here locally with a S4 that has a HTA3076R, that is a better turbo all around than the HX35S, except for reliability (have had to rebuild it already ), but it was also DOUBLE the price.

P.S.
I do not have a hidden agenda in this. I do not sell Holset or Garrett turbos. I just tune a wide variety of cars and report what my findings are. If a customer comes to me and asks for the ultimate 500hp setup, I will pick a HX35S each and every time.
The EFR turbos are quite nice also (Bullseye S256), but the packaging is a bit difficult, and I find the HX35S works better than the S256 also. Masterpower - we have one in the shop right now, it's going on a VR6 turbo. Dirt cheap. Looks like quite solidly built, but have not run it yet.

[snp10]

If a turbo have full boost over 4500 rpm I think that will be a car for straight line . Can have 650 hp and be beat by a 200 hp car in traffic, and with this I don't encourage the traffic racing

[PRY4SNO]

The EFR turbos are quite nice also (Bullseye S256), but the packaging is a bit difficult, and I find the HX35S works better than the S256 also.

Can you explain this please?

What did you mean when you put the Bullseye S256 after the EFR? They aren't the same turbos at all. Did you perhaps mean the performance is similar?

[prj]

Can you explain this please?

What did you mean when you put the Bullseye S256 after the EFR? They aren't the same turbos at all. Did you perhaps mean the performance is similar?

I'm sorry I should have said BW, not EFR.
Packaging difficulties apply to both BW, and especially EFR.

[A80Avant]

I have been using the HTA3076R as it's my turbo since 2012. I had my original 3076 upgraded by Owen developments who also offered to improve some of the cartridge internals for me.

Even though at the time all I wanted was the compressor wheel installation, compressor housing and a balance they did a health check and said the turbo needed some internal changes/ renewal so I don't know if they actually charged me for a whole center section which they probably did which is why I paid for the package around 950£

However on a ported head and 0.63ar I get to touch the 500hp crank and what's most important for me is the fact that the car is alive from well within the 300 rpm on 4th gear 3800 on 3d gear and 3200 even on 5th and 6th gears

It's expensive of course not the cheapest option you can get

[igor136]

What is with this ttrs turbocharger? Can we put it on our car?
http://www.ebay.de/itm/NEU-Original-...item19f4ee8f06

[Ficksy Heart]

the manifold don't fit on the old 20V heads...

[Quattronaut]

The compressor wheel of the TTRS chargers can be fit to the stock S2 charger.
Then you have a charger that is able to do up to 320hp with the fast throttle response and early boost of the stock turbo; by additionally changing the turbine wheel (stock housing can be used afaik, but must be machined a bit) you can go up to 350-360hp with nearly the same behaviour. Very, very good turbos :-)

But the TTRS turbo is far away from being capable to do 500hp.