Garage19

At what rpm does your T34 with a .63 ex housing start to make positive pressure?

Any one got a dyno chart with a boost trace?

Just trying to figure out a spec for an engine I'm working on.

Rick

depnds what gear. in 5th about 2300 on 1600 cvh.

Garage19

Sorry, should have been more specific, on a YB and say a 4th gear pull.

Stu @ M Developments

iTrader: (12)

Will add a datalog graph to this post in a moment...

Stu @ M Developments

iTrader: (12)

T34 .63 with YB @ approx 8.2:1

Staffi

iTrader: (1)

nice one Stu

wimwerf

35psi...

Garage19

Shit hot Stu

Thanks, just what i was after.

Exhaust housing selection -drivability Vs top end power, its always such a dilema!!

CossieRich

iTrader: (1)

Stu,

Is that the datalog from your own cossie? If so what form of boost control are you using?

Stu @ M Developments

iTrader: (12)

Always a mare pal, always a mare and often a long drawn out trial and error process.

CossieRich

iTrader: (1)

Stu,

Can you answer the question above your post plaese pal?

bud-weis

just looked at an old RR graph, mine makes positive boost at 2600rpm

Garage19

At nearly Ł300 a housing I'm trying to get right first time but there is only so much homework you can do based on assumptions before you just have to suck it and see.

If you could sell some of your experience, I would love to buy it!

cossie4i+

iTrader: (15)

That boost curve is fab

Steve.

Stu @ M Developments

iTrader: (12)

Yes Rich, Its a HKS EVC 5 Uk Spec.

Stu @ M Developments

iTrader: (12)

Let us know what your trying to do, happy to advise in my spare time on here if its something i may be able to help with mate.

Stavros

What advantage would there be of going down to the .55 housing?

How much power is lost? How much better spoolup?

Purely for strength (esp when used with antilag) issues I been considering a T34 when doing new engine for the sheddy SX.

Only 1.8, revving to 7500, usually peaks in the 6500-6900 area.

Thinking a .63 would be a bit wank low down, need the responce really, ALS or not.

Though in all honesty they rubbish as standard even when on boost until they hit 4500 or so, even tho they on boost from really low down, they still fairly gutless for some reason, peak torque is always high

Mike Rainbird

iTrader: (3)

Steve,
You can use cam timing as well to get the turbo to spool up quicker, but then you have another trade-off of moving the power band around (in a similar way to the exhaust housing).

Obviously the skill is matching cams / timing / turbo to get the exact driveability you require.....

Stavros

Yeah i know mike, but its hard to know the effects without trying that, so for now, its time to work out purely the changes with diff exhaust housings.

In one manor im thinking .48 actually, as if anything with only 1.8 litres its less important than on a cossie to have a big housing, and all .48 cossies ive driven have felt fine, not dead at high rpm or anything, even if they do potentially have less power, hmmm...

Garage19

Trying to decide if what ex housing to use on a GT30R for 450bhp ZT 8:1

Making some big assumptions, eg T34 and GT have same ex turbine size and trim, same rotating assembly inertia etc

I know the gt is BB cartridge and may spin up earlier but it has a larger compressor wheel so in the world of big assumptions they might even each other out.

I was leaning towards the .82 housing because of the highish CR, and niggling thoughts that i might run into surge if i use the .63 with out mapped boost control?

Just woriied with a .82, I'm not gonna see much action before 4k.... but then i do have the nitrous setup on the ECU for spool up.... ooooh now i know what my missus is going throught when she spends ages staring at all the shampoos in the supermarket!

GARETH T

Stavros

Oooh, good call about surge

Complicated shit sometimes innit, i want my cossie back, that was easier

GARETH T

sadly it does boil down the trial and error

CossieRich

iTrader: (1)

And how much is one of those puppy's then Stu?

Stavros

I cant afford trial and error I can barely afford anything

.55 seems the chickens way out middle ground hopefulness, so thatl do i guess

In all honesty, the power delivery of a big boost .48 housing T34 is absolutley ideal TBH, but if it surges low down then your back to square one arnt you...

Rick

doubt it'll surge mate, my 8v 1600 doesnt.

CossieRich

iTrader: (1)

Steve,

The power delivery of a big boost .55 housing is just as good as a .48 one expect the boost doesnt tail off as much or as quickly as the .48
I have just changed form a t34.48 to the .55 and there is no loss of spool-up time and is just as responsive.

Stavros

Rick- Isnt yours .63 housing, so would be less likely to anyhow?

Rich- Great info, cheers, just the sort of stuff id need to know

GARETH T

has anyone ever surged a t34? they are as hard as nails

Staffi

iTrader: (1)

Mines a .48 housing and it pulls really well, no feeling of lag what so ever, and as for tailing off, you dont really notice it

Karl mapped my car, peaks at 32psi/ holds 28 psi feels very strong all the way

Garage19

Up incase anyone else has any experience/views of GT30 ex housings.