After running 400 bhp and 400lbs/ft of torque @1.2bar on my poor little, maxed-out GT28/71R for the last couple of years, i decided to upgrade to the next size turbo.

I bought Eldihno's GT30/71, got Barbz to swap the .64 housing for a .86 and had the old girl mapped today.

A couple of tweaks to the fuel and timing maps to synch the new injectors and the results are as follows;

440bhp, 450lbs/ft @1.4bar.

Peak power is capped due to the compressor having reached it's limit but the torque is phenominal.
I'll run it at this level for a while and maybe look at a 76 compressor in the future.

A testament to the efficiency and quality that Barbz has built into this engine.
No high boost, no high revs, no drama.
I don't know of a similar sized engine that can throw out as much punch and at such mediocre boost levels.

Barbz, me ole mucker, you were chuffed tonight when i told you, well i'm still smiling now

fantastic result, can we see the graphs if you have them

glad to hear it mate..

it felt quick last week rob before the map was tweaked doesit feel any quicker now?

that dog still hasn't payed up!

440bhp,450lbs/ft @ 1.4bar what a result

Brill result rob!

thats some insane torque..

well done mate

Nice one Rob, great results there

Has the oil usage slowed with the new turbo?

Excellent Rob, is it more driveable now with the bigger housing and turbine? It would be nice to see your graph, it should be similar to Mavric's 2.4 with a camel hump torque curve.

Thanks all but I think Barbz and John, my DTA man deserve the pats on the back, I'm only here for the ride :-))

Joe it wasn't the turbo, more a possible rings issue but won't know till it goes home to papa for a short visit next week!

I'll pull off some graphs next time I'm out there as it was a late session yesterday and totally forgot to print some off.

I was half expecting the clutch to start slipping but the tyres seem to let go first. Anyone that knows me will know I never launch hard and don't drag my car.
It's a pure road car with more low-down grunt than most things out there and have embarrassed quite a few expensive cars when they've wanted to 'play', and that was at 400lbs.

In a word, brutal.

Nice results Rob. How do you find the extra 40bhp and 50lbs of torque compared with the old turbo?

Rob - thats a cracking result mate!!

Sounds like a great motor. Didn't know you were running a DTA ecu - good to see people using something different.

Alexis, it's certainly noticeable, especially the mountain of torque. Slightly laggier than the 28 but that was full boost at just over 3k

Nobby, I've been on DTA since before the 2.4.
There were software issues initially but all ironed out now. It's certainly an alternative to the Motec and have had 30k miles of faultless running on this set-up

good work Rob

think i made 440 at 1.2, but the torque is miles off yours, due to the head size...

That must some "pull" from the engine fella !

hope that box is tough !!

is that the new turbo with the 0.86 housing that's at full boost at just over 3k rpm or the gt2871r

Fantastic stuff Rob.

That was the 2871 and it ran out of puff at 5.5k but had less lag than an n/a

Taz,
I don't think I'd get that much more headline power even with the 76 housing and probably another 10+ lbs of torque but that wasn't really my goal, I only always ever wanted a big torque curve and I've got that in spades now.

Like I said, I'm not hard on the drivetrain and I've been running high torque at very low revs for 30k now and the box has held up really well.
Even Joe commented how tight it still felt but yeah, that and the clutch will be the first things to suffer at this level.

What clutch is in this Rob?

Joe to be honest I can't remember exactly but it was one of the first 4 paddle clutches that Barbz was fitting in the early days.

Barbz, can you remember?

Rob, Barbz and DTA Well done!

I was thinking how this was all coming along the other day actually.

Bet your chuffed!

if you told be the right name last time we spoke about your clutch its an alcon clutch.

Adam, i think that's the one mate, memory not as good as it used to be!

yer we will all end up like that at some point

Nice Rob - good to see one of the few 2.4 boys pushing it!

The torque figure is very impressive, but I would have expected more peak power - you're only producing about the same as I'm getting at 1.4 bar

However, it's torque that makes a car feel quick and you're miles ahead of my 380-ish lb-ft - must feel immense on the road

Yeah Nigel, the shove is immense.
It actually produced more power higher up @1.3bar than @1.4 which seems to suggest its passed its efficiency limit and EGTs were getting too high.

Have pegged it back to 1.3 so just under 430brake and around 435lbs

These figures are with the GT30/71, right?

You dont need to make any more changes for a long time.. ;-)

How is off-boost performance mate?

76 wheel or even 82 next

Behave will you

Nazo, the car has always been very good off boost, and you're right, i'll keep it like this for a while.

If i wanted top-end power i would go a different route, as it is now, suits me down to the ground.

Great figures - any plans to get it on the quarter mile?