STeye

I have an MD304.

There is an MD309 and an MD195 in the for sale section.

Could someone please explain to me what the numbers are in reference to. Are they an indication of potential power or just the serial number that Turbo Dynamics give them?

Are the MD hybrids just the IHI's?

What other MD's are there? MD380 MD400??

Didn't want to bother Mark on the phone with such a simple question. (For those who know )

Nezz10

nobody knows? That does surprise me!

Pavlo

just model codes really.

just like cars

steve McCulloch

I think they have different spool up charecteristics....

I am still informed that the 195 produces the most peak power of a VF22... hybrid but tends to spool up slower as a result...

So 309 does not mean that it has more power than the 195 for instance

I would be intrigued if someone could post what the expected torque and power outputs of these turbo's is?

Andy.F

Not sure that's a good idea ? Depends too much on other things IMHO.
A list of tested results such as dyno/rolling road runs with full engine specs may allow you to compare and 'copy' someones complete set up.
Otherwise you will get a completely different result from the next guy.
As an example, someone recently emailed me who had been sold a VF22 turbo which he was told would hold 25 psi to 7000 rpm
In reality it struggled to make 20 psi at that rpm. Thing is, if you build enough backpressure on the exhaust then it probably would make 25 psi but with really low power output.

It's a real can of worms speccing turbo's when you don't know the engine details.

Andy

steve McCulloch

25psi on a vf22

Cripes they are so weak I would'nt trust them over 15psi!!

Thats for the std VF22 - these turbos are awful.. Once you have a Hybrid VF22 then they are fine

Andy.F

It's quite scary the claims made for some turbo's !

There was a guy recently on this board that fitted an APS AP? 50 which was sold as a 500 bhp turbo, it never even made 400 on his fully prepped 2.2. Now this was not necessarily the turbo at fault but when someone advertises a 400 bhp turbo it may not make 400 bhp due to the full set up.

If someone was selling me a turbo and claiming xxx bhp I would want to see -

1- A compressor map which I could assess for suitability (or ask advice of a 3rd party if you can't do this yourself)

2 - A rolling road/dyno power print out of the turbo fitted to an identical spec engine. This would be to verify the bhp claim and allow assessment of any lost power/torque at lower rpm.

Andy

steve McCulloch

Andy

So if I got hold of a compressor map for a turbo you would be able to assess it for me - as I've no idea what they mean

steve McCulloch

Tah

Will see if thats possible

Now I wonder what my engine spec is

hypoluxa

Turbo Dynamics rate the MD195 at 430hp iirc.

Andy.F

And to verify this we have ??????????????

Nezz10

What is the MD304 rated to??

hypoluxa

Nothing apart from a fax from TD saying that is what it is rated at.

steve McCulloch

430bhp..... hmmm.. I'd say its nearer 400bhp.. from RR experience unless all RR's understate... I doubt it

Andy.F

In the absence of any requirement to provide the slightest trace of substantiating evidence ...... I rate a TD05 at 500 bhp and a TD06 at 600 bhp

MorayMackenzie

Andy,

That sounds fair enough... considering all the TD04 cars running close to 400hp in the USofA.

Moray

BTW: Have you seen a compressor map for the 18G wheel?

john banks

The 18G is reputedly not so good because of the primitive compressor design?

steve McCulloch

Andy

would be nice to see any Scoob get 600bhp on any turbo... would be nice for one to get 500bhp on any Rolling Road.! (and yes I am aware of certain Dyno runs)

Maybe one day........and a fair bit of money later

Andy.F

You shouldn't need to wait too long Steve (and I don't mean mine)

Moray

'If' the 18G compressor wheel was in between the big 16G and the 20G in in terms of flow and PR capability, I think it would be ideal for the job. However having seen a picture of one, it is a completely different design. It only has one height of blade (9off IIRC) instead of the two stage 6 high/6 low design of the 16 or 20g.

The 18G doesn't seem to be very popular with the USA DSM boys who are successfully running many variations of TD05/06/07 with small 16G, big 16G and 20G compressors.

Andy

ps No, I've not seen an 18G map

Pavlo

The big 16G is better all round than the 18G IHMO, based on the compressor maps alone. Experiences of others seem to ad weight to that argument.

David wallis' turbo: MD666

MorayMackenzie

Pavlo,

Do you have a copy of the 18G compressor map you could send me please?

I had previously been led to believe that the 18G wheel was the same as a 20g wheel but with a 55 rather than 60 trim.

Cheers,

Moray

Andy.F

Moray

It was possibly I who mislead you if indeed I used the word "same" ? I believe the 18G does sit midway between the big 16G and 20G in terms of its 55 trim and they all share the same compressor OD. The 18G flow rating is closer to 16G than 20G though.

Andy

David_Wallis

LOL @ Pavlo..

So true..

my last one was a MD320..

David

MorayMackenzie

Pavlo,

Do you have a copy of the 18G compressor map you can send me please? You mention that your comparisons are based on compressor maps alone which is what gave me the impression that you have access to an 18G compressor map. I would very much appreciate a copy of said map.

Thanks,

Moray


Andy, et al,

I am sorry if I have not been clear in my request before... I am actually looking for a compressor map for this wheel. If you have one and you can send me a copy, that would be great.

The other information that has been volunteered seems to be mostly rumour type stuff, mostly. I would like to find the compressor map so I can see how the wheel really works and can make my own comparisons to other compressor wheels out there, MHI or not. IYSWIM.

Cheers,

Moray

Andy.F

Moray

What I think you're really trying to say is that you want to see a compressor map for an 18G I did see one but can't remember where....doh I'll have another look around.

cheers

Andy

MorayMackenzie

Thanks Andy.

Andy.F

Yes no problem. Also as much info on the turbo, engine, induction and Exhaust as possible to allow a reasonable estimate of flow capability. Email me if preferred.

cheers

Andy

[Edited by Andy.F - 3/7/2003 7:15:40 PM]