Thread: What Boost can be run?

Originally Posted by rick130

Beyond the flow map

Yeah that one costs a lot more to fix!

A little bit more than stock can be had simply through tuning, but as soon as you go beyond the turbo flow map, all you do is make extra heat and overspeed, it can work ok for short bursts of extra grunt, but as far as daily use when the extra power is needed for longer duration, you'll run into issues pretty quick.

Cheers
James

Originally Posted by shack

Yeah that one costs a lot more to fix!

A little bit more than stock can be had simply through tuning, but as soon as you go beyond the turbo flow map, all you do is make extra heat and overspeed, it can work ok for short bursts of extra grunt, but as far as daily use when the extra power is needed for longer duration, you'll run into issues pretty quick.

Cheers
James

If that map that Dougal posted in the thread I linked to is correct, we can see why even the relatively cheap hybrid CHRA replacements make people happy.

I'm trying to limit/slow the $ outflow and was looking at a HD flexplate, upgraded TC and maybe A clutchpack next, along with an ATB in the centre diff while it was all out but a new IC is going in in the next two weeks along with an entirely new cooling system and machined and coated exhaust manifold to match up with the 3" exhaust.
A hybrid turbo and remap would be oh so nice.
Damn!

I run an allisport intercooler and Td5inside hybird turbo and remap at 28psi peak and 26psi stable and runs great those turbos can handle over 30 but your head bolts can't haha

Originally Posted by Kaaaiju

I run an allisport intercooler and Td5inside hybird turbo and remap at 28psi peak and 26psi stable and runs great those turbos can handle over 30 but your head bolts can't haha

I'm trying not to message Jose!

What Dougal posted is most likely correct,
(I have 1% of his knowledge and experience at best on this subject)
And I also haven't sat down and worked it out, but the problem I guess is that map is not for the turbo on the td5, and a map for one isn't publicly available, so that makes it a bit awkward to find the absolute definite maximum flow rates and pressure ratios etc.
It is however a reasonable baseline to work from in the absence of the proper thing.

Cheers
James

Originally Posted by rick130

If that map that Dougal posted in the thread I linked to is correct, we can see why even the relatively cheap hybrid CHRA replacements make people happy.

I'm trying to limit/slow the $ outflow and was looking at a HD flexplate, upgraded TC and maybe A clutchpack next, along with an ATB in the centre diff while it was all out but a new IC is going in in the next two weeks along with an entirely new cooling system and machined and coated exhaust manifold to match up with the 3" exhaust.
A hybrid turbo and remap would be oh so nice.
Damn!

Pm sent....

Are you just interested in peak boost pressure, or the spread and where it is in the range? I ask as a big turbo charger 50psi at 7,000rpm would be useless to me if it meant no or low boost down low. I'm running a TurboTechnics S208 VNT which gets up to around 15psi before 1,500rpm, it'll continue increasing and for most of the usable rev range will be between 19 to 25psi. 25psi is the peak I've noticed on it.

Originally Posted by stevo

Hello, just wondering what people are running boast wise as I have the TD5 Alive turbo

It's going to vary drastically depending on the turbo charger being used. Being an Alive Tunining unit I assume it's a hybrid turbo charger so being bigger I'd expect you to be able to achieve higher peak boost levels, but later in the rev range (compared to say a VNT).

Originally Posted by rick130

Wasn't 25psi getting to the point where that turbo was getting off the map?

That'd depend what map tune is being run and what else has been done to suit it. It would certainly likely be beyond the standard MAF and MAP sensors ranges. There's electronic trickery to deal with this such as the turbo boost boxes for the MAP sensors, dual channel turbo boost boxes for both and Alive used to offer a generic/pattern (horrible quality) MAF sensors that had been internally modified. Better still you can now fit the OEM Mercedes Benz MAP sensor that reads a higher range and adjust the ECU tune to suit and a software clamp in the ECU tune for the MAF sensor.

Originally Posted by rick130

Naa, boost box just fools the ECU so it doesn't go into limp mode, but if you go off the map the compressor is really inefficient and just starts to create heat instead of increasing air flow. It basically beats the air up.

EDIT: apologies rick, I assumed you meant off the ECU tune MAP, not the turbocharger flow map. In this case Stevo has an Alive Tuning Hybrid turbocharger fitted so it has a different flow map which incorporates higher PSI.

Originally Posted by rick130

A hybrid turbo and remap would be oh so nice.

VNT hybrid would be even better!

Originally Posted by rick130

I'm trying

Originally Posted by rick130

not to message Jose!

Hopefully if you do he will be happy to supply you with one of his hybrid turbos, but sadly he isn't dealing out his VNTs our way - which are a far superior product.
Alive Tuning are releasing a hybrid VNT soon, which is likely heavily influenced by Jose's successful units (even uses the same supplier for the impellers), which might be more accessible for those of us here in Australia.