It IS an R5 Turbo, what now?
Turbo Mini Forums

axel,
it would not necessarily make more back pressure than a t3,this would depend on a/r design of the turbine wheel scroll and the efficiency of the turbine compressor combination,

also the point where turbine inlet pressure rises above manifold inlet pressure,is uisually after pk boost has been reached ,so yuo would get a normal power band until that point ,then ,if there was a degree of reversion sufficent to be detrimental to the cylinder filling process ,this is when it would start to bite,so you get a premature drop off in power . dont know if i communicated that very well but i hope it made sense ,lol
regards robert.

Edited by robert on 6th May, 2006.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Pete I am very interested in the methods of getting TIP<MAP, I'd like some more info on this, PM if you like....

peter ,if yuor tip is over the mip ,all the way thruogh the range ,id suggest yuor using a dynamic pickup for the tip and a static for the mip. usually on a reasonable response versus top end bhp design ,the crossover point is about pk torque if its all matched, if there are no points in your engine wherethe mip is higher than tip theres something wrong somewhere if using static pressure pickups all thruoghout ,regards robert .

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

AlexF

Ivanhoew,

Your bike, 500cc, boost at 3800rpm from a T25.

Since you wont tell us how, I'm going to take a guess!

Did you advance the exhaust cam so that you had less overlap and higher TIP & TIT (Ha Ha).

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

i know i am a bit thick like and all this has gone way over my head

but i would have thought the sensible thing to do is go for the t3 as you knew that produced the goods and then work forward from there?

You've got it spot on Wolfie.

the T3 is going back on, then back to the RR to see the differance. Watch this space for the results.

Wil

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

peter ,check your pm

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

oh, I remember this post....


There was peeps looking for the T2 maps, but didn't want to swap any of their secret information...

Well here are the T2 maps which i finally managed to get to a half-reasonable scan quality (these were A3-sized - and the little lines make them a PITA to scan).

http://www.turbominis.co.uk/iain/up/t250trim.jpg

http://www.turbominis.co.uk/iain/up/t260trim.jpg

Hope this proves useful. I do have a 45-trim map, but figure no-one would want that, so couldn't be arsed to scan.

Edited by turbodave16v on 17th Nov, 2006.

Oh dave !
you're so generous!

wil
don't back to T3, t25 comp wheel are a lot more generous with 2pr efficiency, a the tiny 0.35 t2 is a good bet

Thanks for the map Dave.

Sometimes you just have to wait!

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Just printed the map and, guess what, my calcs were correct.

Due to the lack of a map for a R5GTT back in the early days, I decided to calculate one.

I assumed that the T2 50 trim was a geometric model of the T3 50 trim for which I had a map. I also had physical dimensions for the compressor wheel for both.

This gave me a scale ratio from which I was able to predict a map using the modelling laws from my pump design days.

So we can now do this for others if necessary.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."