td05h turbo evoIII

Post Mon May 16, 2011 2:53 pm

So i have just been offered a turbo off an evo III, £50.00 there is nothing wrong with it at all and it was only removed to put a bigger one in its place.

Could this be the turbo for my 325i convertion.

Post Mon May 16, 2011 3:35 pm

Turbo = TD05HÃ¢â‚¬”a16G6-7
Nozzle Area (cm2) = 7
Turbine = Inconel (steel alloy)
Compressor = Aluminium, 68mm wide
550cfms@15PSI of boost

I think ?

Post Mon May 16, 2011 5:10 pm

in addition to this wether its good or bad, can someone tell me what the compression ration of my engine is/should be M20b25 manufactured november 1986.

The reason i ask is because i think i remember reading that there were two variants of the m20b25.

Post Mon May 16, 2011 7:07 pm

There are 3 M20b25,
pre facelift high comp @ 9.75:1
a few very early facelift's 9.4:1
all later facelifts 8.8:1

Post Mon May 16, 2011 9:41 pm

so where does mine fall in them 3 please or how can i tell or find out..... cheers for info

Post Mon May 16, 2011 9:58 pm

spbt1 wrote:so where does mine fall in them 3 please or how can i tell or find out..... cheers for info

1986 M20B25 will be..

e301988325i wrote: pre facelift high comp @ 9.75:1

Can't offer any advice with the turbo but good luck with it

Post Tue May 17, 2011 8:52 am

Thanks for the info guys.

So i am pressuiming i am going to be able to achieve a good enough compression ratio by adding mls head gasket.

Could still do with a turbo guru to identify whether or not this turbs will be suitable as i have read a number of conflicting arguments across the various bmw sites.

Post Tue May 17, 2011 2:54 pm

It´ll be good for something like 300hp or around that,
more details about the compressor inducer and turbine exducer will explain further.

Post Tue May 17, 2011 5:13 pm

Thanks for that gunni. Hopefully i will bring it to you for mapping when done, although this won't be until the autumn.

Post Wed May 18, 2011 9:14 am

Gunni wrote:It´ll be good for something like 300hp or around that,
more details about the compressor inducer and turbine exducer will explain further.

will this help

TD05H-16G (Big 16G) EVO VIII
stock turbo Compressor Inducer 48mm,
Exducer 68mm
Turbine Inducer 56mm,
Exducer 49mm

As i would like to know wether it worth bothering with or wether its worth buying to ebay and then pu the funds towards something better.

Post Wed May 18, 2011 10:31 am

That turbo will produce 280 -300 hp quite nicely. You will sit a bit to left of peak compressor efficiency at peak power air flow. It should work, a nice find.

If you are able to run past 1 bar of boost more should be possible as there is spare capacity in that turbo at the flow rate Gunni suggested.

Post Wed May 18, 2011 4:04 pm

eta wrote:That turbo will produce 280 -300 hp quite nicely. You will sit a bit to left of peak compressor efficiency at peak power air flow. It should work, a nice find.

If you are able to run past 1 bar of boost more should be possible as there is spare capacity in that turbo at the flow rate Gunni suggested.

Cheers for that.

I am relativley new on the e30 scene and would really like to discuss a turbo conversion in detail so if anyone wants to share there knowledge one evening i would be more than happy to give you a call and discuss the whys and wherefores, if only to create a project style picture in my own mind.

Post Wed May 18, 2011 5:28 pm

keep posting questions and all will be answered