Karlos G

iTrader: (4)

What have you all had out of yours BHP wise on a 1.6 RST?
Please no "I've heard you can get 400bhp" or "my mate said they are good for 1200bhp" lol
Actual dyno'd figures only

Thanks!

crazycage

261bhp, with a little more left in it. i built my zetec instead of developing it more.

Karlos G

iTrader: (4)

Cheers Gary, what boost was that at and where you on stock manifolds or your own?

Rick

they tend to be 55 trim.

Just do it, you will soon forget about power band moving up.

juffer

Do you have to change wheels if changing to a larger housing?

crazycage

16psi on both my inlet and exhaust manifolds

Karlos G

iTrader: (4)

Mine is 50 trim Rick, TT stage 2 but without cut back blades.
I am on the hunt mate
Nope.
Cheers Gary.

Rogeyboy

iTrader: (2)

Ive got my .48/55 on now and it boosts up nicely by 3,300rpm! So it doesnt shift the power band up too much!

No power figures tho sorry!

Canada1

Hello Karlos,

Dyno figures can be very suspect as well. I have seen wheel hp to flywheel conversions ranging from 12% way up to 35%. This can be a very dodgy subject.

I would just use the same dyno you already have used, and make your turbo change to the stage 3, and then compare results. The actual HP level recorded may or may not be accurate, but the HP difference will be the best indication. The HP change is more important than actual HP numbers.

The cvh engine has a very poor BSFC numbers - around .60 or worse (very inefficient combustion chamber)
This means lower power output possible per lb/min turbo compressor flow capacity.
The 60 trim T3 flows a maximum of 32 lb/min - theoretically 320 flywheel hp.
However with a BSFC (Brake Specific Fuel Consumption) of .6 to .65 the maximum HP
is quickly reduced well below the 300 HP level (280 ish)

This is why some engines can get much more power from a given turbo than another engine type.

Hope this helps.

Rick

Perry,

have you ever played with the CVH lean burn heart chamber head?

stevealien

iTrader: (1)

ive heard there good for 400bhp,but my mates is 12000000000 bhp

Karlos G

iTrader: (4)

Yeah I'm aware of the CVH's high BSFC and how it effects how much a given turbo will make BHP wise.
Do you have a comrpessor map for a 0.48/50 T3 as this is what mine will be?
Thanks!
....

Rogeyboy

iTrader: (2)

Whats the diff in a .50 trim and a .55 trim comp wheel?

Karlos G

iTrader: (4)

55 is a bigger wheel so will flow more than the 50 meaning greater potential BHP.

Canada1

Hello Karlos,

The T3 50 trim map shows that the maximum flow is 28 lb/minute.
I would guess an upper limit of 240-250 flywheel HP with the 50 trim compressor.

The 55 trim might have a potential for 15 hp more than the 50 trim.

Canada1

Hi Rick,

I do have a large valve (42mm/37mm) lean burn heart shaped chamber cylinder head.
This will be investigated over the next few months.
If these lean burn heads come close to the airflow of the hemi heads, then we might have something. The lean burn head has a good quench pad area - should be great to improve the BSFC numbers. For a turbo application we would design up a reverse dome that mirrored the head combustion chamber. Leaving us with the quench area - set up at 0.045".
Might make for a very interesting cvh turbo?

Brendan

iTrader: (1)

oh man! I ony got about 180 / 190 bhp but my engine runs colder than a normal RST fiesta. The other thing to worry about is torque as this is what gives you acceleration! I can't complain about the way stu set mine up.

I am only using a t2 this does limit overall BHP but spinns up quick!

Karlos G

iTrader: (4)

Really? My .36/50 flows for 231bhp with a .48 I was expecting 260bhp+ as the .36 is very restrictive
Hardly worth the bother and extra lag for only 10-20bhp! lol

Canada1

Hi Karlos,

The .36/45 and .36/50 are a good match between turbine and compressor.
I thought stage 3's were .48/55 and .48/60?

You are certainly right - you may only gain 10 -20 HP with the change to a .48 turbine with the 50 trim compressor. The limit then becomes the small compressor (50 trim).

Probably why Garrett made .48/55's and .48/60's and no .48/50's as a standard part.
The .48 turbine needs a larger compressor than the 50 trim.
Garrett also did make a .63/60 trim for larger 2.3 liter Fords.

Cheers

juffer

So a 0.48 compressor housing would bolt to a standard t3 rs turbo unit ( 0.42) with no other modifications needed ?? not even a larger wheel ??

Karlos G

iTrader: (4)

My turbo is a Stage 2 (.36/50) Perry and I was just going to drop a .48 housing on as this is my restriction now effectively making it a Stage 3 but for that little gain it's not looking like a worthwile move now.
No Jeff we are talking about a .48 turbine housing not the compressor side mate.

series_one_rst

I was looking at a new turbo yesterday, thinking of using turbo technics. looking at running 20psi but want to avoid too much lag. thing is the engine I've got in ATM is probably gonna be laggy anyway. big valves t2 cam low comp pistons etc. was thinking of a stg2? the other thing is its a long way off but I'm thinking of building a zvh or maybe a zetec to go in for when the current engine gives up. would a stg2 flow enough air to suit?

thanks. Ste.

series_one_rst

currently 1600cvh

Canada1

Hello Series One Rst,

A stage 2 T3 will be very small and restrictive for a 2 liter engine - zvh or Zetec.
Your exhaust back pressure will be extreme with the .36 turbine housing, and the 45 or 50 trim compressor will not have enough flow to support 2 liters at 20 psi.
A stage 3 T3 (.48/55 or 60)will not be large enough for a 2 liter engine at 20 psi boost.

series_one_rst

cheers mate.

how would they work on the cvh @20 psi. dont think i`d run that much on a 2litre, probably 14ish? and like i say its a long way off. priority is the 1.6 at the minute.

anyone used turbo technics?

Rick

Throw a 2nd hand cossie t3 on. The 3 bolt housings flow much better.

series_one_rst

on the 1.6 rick? the sierra cossie stage 1 is cheaper than the stage 2 rs turbo. aren`t the exhaust joints different? would that be too laggy? suppose it would work better if i did change to a 2litre.

http://www.turbotechnics.com/turbo/hybridrange.htm

Rick

yes, you need to mod the downpipe but it's a better setup. no difference in lag than a stage 3

wilky

iTrader: (1)

what about a 360 bearing

series_one_rst

ok cheers mate. I'll keep that in mind, appreciate it. is it much of a job to do the mod?

Rick

360 bearing is just for durability. You need to have somebody weld you the downpipe.

Herbo747

i have got a cossie t3 (2wd) with a 360 degree bearing on my 2 litre zvh, just had it mapped and down pipe made at jampsort saturday just gone, and it made 250 hp at 15-16 psi. really pleased with that!