pistion type dump valve - Page 2

danbmx_69 · 14th February 2013, 20:27

mine with the z and f map
need to wait till the week end so i can take a look at this dump valve to see if i am leaking boost

E_T_V · 14th February 2013, 20:35

That looks much better. I'd like to see boost and AFR's though to check they are safe.

VVC-Geeza · 14th February 2013, 20:42

Quote:

Originally Posted by E_T_V

EEeek those curves look pretty horrid. Turbo is obviously too small as boost tails off above 5k. Not sure I like the torque/boost spike either.

Did they do AFR's on the run too?

It was a basic powergraph so unfortunately no AFR reading.

As Dan illustrates,Z&F can make the graph look very different

E_T_V · 14th February 2013, 20:45

I can make the graph look very different. But perhaps not in a good way!

What turbo is fitted to these and what does it flow? I'd have throught it would be really on its last legs hitting 200bhp.

danbmx_69 · 14th February 2013, 21:05

Quote:

Originally Posted by E_T_V

I can make the graph look very different. But perhaps not in a good way!

What turbo is fitted to these and what does it flow? I'd have throught it would be really on its last legs hitting 200bhp.

its a gt2052ls turbo with these engines you start to push your luck around 220bhp i have been told by mark at Z and F,who did a lot of development back at MG rover with these, and i dont think much more boost then 12PSI is recomended, but i do think it is possible to run these around 220BHP with a good enough intercooler/ charge cooler as i think its boost that kills them hence not pushing it much more over 12psi

E_T_V · 15th February 2013, 15:46

I'll try and find a compressor map for it if one is available. The boost tailing off at high rpm would indicate it is a little on the small side. (I'm used to running a T28 and a T3 on non K series).

danbmx_69 · 15th February 2013, 16:41

Quote:

Originally Posted by E_T_V

I'll try and find a compressor map for it if one is available. The boost tailing off at high rpm would indicate it is a little on the small side. (I'm used to running a T28 and a T3 on non K series).

i think this is the whole idear on the turbo of these cars is just to generate some low and mid range torque just to get the thing going

14th February 2013, 20:27	#11
danbmx_69 Gets stuck in zt 160 Join Date: Aug 2012 Location: swansea Posts: 970 Thanks: 21 Thanked 62 Times in 43 Posts	mine with the z and f map need to wait till the week end so i can take a look at this dump valve to see if i am leaking boost __________________ Now 320BHP 407nm 1.8T ZT https://www.the75andztclub.co.uk/for...d.php?t=122691 Last edited by danbmx_69; 14th February 2013 at 20:31..

14th February 2013, 20:35	#12
E_T_V Loves to post MG ZT-T Join Date: Feb 2013 Location: Scunthorpe Posts: 423 Thanks: 8 Thanked 9 Times in 9 Posts	That looks much better. I'd like to see boost and AFR's though to check they are safe.

14th February 2013, 20:45	#14
E_T_V Loves to post MG ZT-T Join Date: Feb 2013 Location: Scunthorpe Posts: 423 Thanks: 8 Thanked 9 Times in 9 Posts	I can make the graph look very different. But perhaps not in a good way! What turbo is fitted to these and what does it flow? I'd have throught it would be really on its last legs hitting 200bhp.

15th February 2013, 15:46	#16
E_T_V Loves to post MG ZT-T Join Date: Feb 2013 Location: Scunthorpe Posts: 423 Thanks: 8 Thanked 9 Times in 9 Posts	I'll try and find a compressor map for it if one is available. The boost tailing off at high rpm would indicate it is a little on the small side. (I'm used to running a T28 and a T3 on non K series).