faithofadragon

i donno how exactly it works but

when a friend of mine had a t25 maxed out at about 15lbs then he switched to a t3 and ran 15lbs he was going ALOT faster down the track i think he dropped like a second in his times

Dmitry

^^^ it's easy.

T25 will loose efficiency at higher RPM (let's say at 5000 RPM) whereas T3 super 60 will stay in max effiiciency till redline.

That's it.

OzFxCoupe

^ Yeah, maybe when a smaller turbo is at it's limit... But not when you are talking 8lbs of boost.

Dmitry

^^ even with 8 psi at redline T25 will be spooling very fast and efficiency will be low, as a result air will be hotter

faithofadragon

yeah i figured it had to do with somethin like that t25s begin to loose efficiency rather quickly expecially on a 300hp beetle lol(he ran a 11.3 or somethin like that)

its all about efficiency

Tibminn

well I got a tiny little t3, so probably not too efficient... but will work fine. Still would like to know if anyone thinks I can run 8psi off of it with a vortech fmu or if thats pushing it too much.

Also still would like to get my previous question a couple posts back answered. Thanks

OzFxCoupe

^ You should PM "preciousfibres" (I think that's his screen-name anyway) as I remember reading something about him running stock injectors, pump & fpr on 5psi & seeing good results... I could be mistaken though.

As for you question re: fpr Vs fmu, I haven't the foggiest. Sorry.


I thought was wastegate was there to stop the turbo from spinning too fast at higher rpms. Also, if air is being compressed to 8psi (or whatever psi) it won't be any hotter than the air coming from a larger turbo making the same boost; the air molecules are being compressed just as much in both turbos.

Role Reversal

the turbo itself adds the extra heat due to friction.

01tibby

yeah, thats the deciding factor. if an engine is seeing equal amounts of boost at equal temps, it doesnt matter what the size of the turbo is. i was under the impression that some people thought a larger turbo would actually have more air flowing at given pressure level than a smaller one.

OzFxCoupe

Friction of what?

I think I'm goung to have to look into this turbo-malarkey a bit more before I put my kit together as I clearly don't have a good enough understanding of it yet.