wot would be the differance with running a T4 with .63 and .82 exhaust housing on the same engine.

Ta,

Steve

 

More Lag, with the .82 that is.

 

Kinda guessed that m8, i aint driven a T4 cossie so im expecting some lag, was woundering if the extra power would be worth it or not.

Steve

Ps. it will be a roller bearing core type if it helps.

 

I have never diven a RB core version so i cant comment sorry bud.

When the turbo gains full boost depends on loads of things like cams and mapping etc. I had full boost with mine just before 4k rpm but only reving to 7.2k, thats a very old skool T4 and Greys set up.

Other T4 cars wont get full boost till 4.5k but rev to 8k. Like i said it depends on spec really.

 

You shouldn't get any additional power really (without seriously compromising reliability).. an RS500 T4 is flat out at 480bhp on a YB and going above this just reduces its service life.

 

would it not be able to get rid of the waste gasses good enough,surging may happen...depending on boost of course.

 

afaik if the gases cant escape it will get boost creep as turbine will be getting to much air and trying to raise the boost. surge is boost air flow that has nowhere to go.

 

thats what i said.

 

ive got the best of both worlds now,comes on boost at 3500,strong at 4 and holds it to 7800rpm limiter

mine has been played with but not roller bearing

 

Would it really increase lag though? I would have though that wouldn't really be affected. I would think boost threshold would move up the rev range though? But surely the time to boost while inside the boost threshold wouldn't alter all that much?

Feel free to call me a cunt if I'm wrong

 

I was refering to threshold Rab, the reason i didnt put lag was because alot people understand threshold as lag.

 

flat out at 480 ! wouldnt have thought so !
rainbums old t4 engine which was about 510 ish IIRC
t4 is flat out at about that ^^^^^^^
and this still did loooooads of miles so i think 480 is a bit low

 

Soooo... I'm wrong because I'm right? Is that right, or wrong?

 

Depends what you mean by a T4. If you mean an RS500 turbo, its pointless.

If youmean a different turbo all together, as there are millions of T4s in the world, there may be a good point to it.

 

Your wrong because you are right in what you said

 

Ah balls

 

Flat-out being what it's rated for.. ask your dad about how the 50 and 57 trim compressors vary!

 

sorry i thought you ment flat out by max horses they can make lol

jim