td06 stage 2

[rob77]

About 8 weeks ago I posted up some dyno sheets of my car with a td06h-20g (16cm^2 exhaust housing). It made 344hp @ wheels with a very ugly power curve due to still running the stock computer. Well its been in again and come out with a wolf3d ecu. Peak power is down, infact we had to run slightly more boost to achieve the same power level (albiet 4.5hp down). What you can see from the before and after graphs is a huge increase in midrange torque and hp (80hp at one point on the curve). The turbo comes on quicker and the power delivery is silky smooth. I am a bit disappointed that the car didnt make 370hp, I thought it would do it easily, but the car is so much better and faster to drive now. It looks like I'll be changing the exhaust manifold definately now, not sure when just a matter of time, as two bolts have been spat out already and it will sag and start to leak at some stage. Hopefully with the better flow of a tubular or tuned length manifold we can sneak more ignition timing into the top end (we had to pull a fair bit out to stop it pinging) to make up some lost HP. I'm also thinking about a cam gear at some stage too. About the only thing left to do would be upgrade the internals, but thats a long long time off if ever, I've already spent bigtime (may not be bigtime to some people ) on the bolt on engine bits.

[rob77]

Boost graph

[sidewaymambo]

mate..well done..well done..

[Gradenko]

Pretty big improvment in the mid-range there, even bigger than 80hp. Looks like 100hp at 6000rpm! The factory ecu is an evil, evil thing.

Kept the afm I hope?

[rob77]

nope, map sensor.

[dojobi]

Great result. One question though, if it could make that peak on the stock computer and lower boost, why couldn't it make it on the new computer. Was that level of power only possible when the engine was running dangerously lean or something? It just doesn't seem right to me. If anything it should be more since you're running more boost. The only way I can possibly think this could happen is if the level of boost you're running is out of the efficiency range or your intercooler isn't up to challenge - both of which I doubt.

[rob77]

Look at the boost graph and see where the power dips and then spikes unbelievably at the top end (that is the run just after the turbo got put on), we think the stock ecu was pulling a heap of timing out in the midrange where it dipped badly and then stuffing a shitload in to make it spike like that, I was also running the stock fuel pump (got changed a few days after) and it was very lean at that point I cant remember exactly but it was somewhere in the high 12's to 13 afr... very dangerous After putting in the bosch 910 pump the afr's got rich again and power dropped to 322hp on 12psi, now its tuned with 15psi making 339hp. As i said it would seem the exhaust manifold is holding up my flow and it will be replaced when the starts to leak, with the better flow maybe we can make another 15-20hp

[RS500]

what AFRs are u running now on 15psi??

if it is running richer than what it was before, that would explain why you're down on power 'cos the leaner u run the engine, the more power u can make but at the expense of reliability.

Also, as sydneykid would say, it's not about the peak hp, it's about the power under the curve (average power).

all in all, it's a good effort dude, happy driving.

[Steve]

That power curve looks soooooo much better than before. Looks like it would be a bit of a weapon now, before it looked like a big laggy stip monster:D (didnt want to say so before:p please dont take offence)

Anyways, enjoy the excellent result, as I am sure you will.

I dont know if you saw the posts by BOOSTD, but he got an extra 13rwkw top end, and he believes around 20+ midrange, with boost starting 300rpm earlier from an adjustable exhaust wheel - definately worth a look in, and relatively cheap;)

[dojobi]

That would explain it

As Steve said, it looks like a real weapon now. I'd be VERY happy with your results. Also having it tuned properly means it's more reliable, which is the most important thing I think (I say this knowing that my car probably isn't too reliable - 1 bar on the stock turbo )

[BU5TER]

Looking good Rob, I love those TD series turbo's hahaha

[GTS-t VSPEC]

I have been for a ride in the car with the old and the new computer, and I can say that the car now is a 100% improvement on the old power curve. The power feels so much stronger down low, and keeps pulling all through the rev range.

Top end power is nothing compared to the extra power under the curve:D I think getting rid of the stock manifold would be a huge help to making more power at the same boost level.

Rob, I look forward to having a race against you in the near future:D

[Guest RedLineGTR]

ggeeezzz good shit..it always helps when u get your tuning right...works out sweet in the long run thoe it may be down on power it will feel like u have more.

[Steve]

RedLineGTR, Rob's car is definately a mile up on power.

Who cares if you loose a few kw at the top end - how many people bounce redline in every gear when they drive? The only thing that is good for is winning dyno comps. The mid range is sooo much meatier, which is where the real performance is esp for a streeter.

[rev210]

4.5hp is 1.3% variation on the old power level. taking into account the temps have been warmer and most of the tuning time is spent on the midrange, since the peak power is plenty for the stock injectors and so on i doubt they would have tried too hard on that end for good reason.