Educated Guess At The Final Tune Results

[Stixbnr32]

So if I go by that graph the 3.2L has 300KW at the same RPM as my 2.6 (pretty close).

How is that even possible? I guess if it had a torque graph (why?) then it would have a massive increase.

But it is stopping at 7000rpm. Please tell me I am reading it wrong.

Edited June 28, 2015 by Stixbnr32

[XGTRX]

Because the turbo has enough flow to make the power at the same rpm with a 2.6. The torque would be different though.

And 2.6s rule the world, but that discussion is for another day... He he

[Piggaz]

Power is torque x rpm

For a given power at say 4000 it will be making the same torque, regardless of engine size.

[XGTRX]

Sorry I meant that torque curve would be different

[sky30]

Turbo is too small. Turbine housing too small which restricts flow and chokes the engine. In this scenario you have no choice but to cut boost.

It will be interesting to see what an e85 tune does because if it makes no significant difference then the turbo selection is the problem.

Why would boost need to be cut?

I have a .82 housing on mine and boost holds flat to 8000rpm

Edited June 28, 2015 by sky30

[Stixbnr32]

Yeah the graph is slightly strange isnt it.

Well as long as it feels good I guess it is ok. I still think 7000rpm is low but if the turbo cannot flow it no point revving anymore.

At least its not spluttering and leaking water.

That is a success.

I would have thought boost would have carried on the whole way through and if there were lean patches from fuel/spark they would have suggested a fix with the amount of money spent on the engine.

Have they had their top tuner leave recently or something?

[Nismo 3.2ish]

The limiter is set at 8000rpm. On the first tune @ 8500rpm .

The PT6262 CEA is rated over 700HP, some blokes say they get more, why would it stop at 600HP ?

When the Turbo was put on he changed to a larger back housing , size ?

So the Turbo should be good for at least 700HP ?

Could it be the spark ?

[Stixbnr32]

Put it this way my turbos are rated at 650hp and I am not pushing them with the same power you have and my boost is 22psi.

What size are your injectors? They can tell straight away if it is running lean and pull boost. Only reason I can think of to pull it.

But they should tell you and then recommend a fix. No point even going near E85. Go from 24psi to 18????

[Nismo 3.2ish]

The injectors are ID1300

It is definitely not as rich as it was, but still a little soot comes out on start, pretty normal but nothing like it was since the build , it was heavy.

Going to have a AF sensor installed. The Haltech R34 Pro has , Wideband “auto tuning” using user definable target AFR table. Not sure if that is the same function as a sensor ,but the next builder will know

I think the boost could have been pulled because it was still farting when the boost remained higher. Just an uneducated guess ?

The car will be checked and sorted out before or during the next tune , I am not going back to Sydney to do it. Looking for a shop closer to finalize the work I want done.

Until then I will just drive it and have some fun

[Stixbnr32]

Yeah just drive it

Fair enough on the travel factor. I am not sure about that tune.

But I am sure the engine is super strong and you will have a lump of torque down low.

I still have all the response in the world when my RPM is high hahah.

[Hadouken]

Just drive it. You said yourself you don't need more power!

[AngryRB]

have to see it through pete!!

I just got to know..

Edited June 28, 2015 by AngryRB

[jangles]

The limiter is set at 8000rpm. On the first tune @ 8500rpm .

The PT6262 CEA is rated over 700HP, some blokes say they get more, why would it stop at 600HP ?

When the Turbo was put on he changed to a larger back housing , size ?

So the Turbo should be good for at least 700HP ?

Could it be the spark ?

If the engine flows too much air for the turbo, it will choke, limiting achievable power and rpm levels required.

Same way as a 2.5-3" exhaust is fine for a stock motor, but not one with a bigger turbo/motor.

PJ has got the rated number and more out of a few PTE turbos, 2l, 4cylinder, 40+psi.

Anyone care to work out the equivalent flow of a 3.2l, 6 cylinder at half the boost?

[sky30]

6262 is rated at 730hp, if there are no restrictions on the motor it should acheive close to that figure.

Peter, what wastegate and boost controller you got?

[XGTRX]

If the engine flows too much air for the turbo, it will choke, limiting achievable power and rpm levels required.

Same way as a 2.5-3" exhaust is fine for a stock motor, but not one with a bigger turbo/motor.

PJ has got the rated number and more out of a few PTE turbos, 2l, 4cylinder, 40+psi.

Anyone care to work out the equivalent flow of a 3.2l, 6 cylinder at half the boost?

That's good and fine to work it all out on compressor maps, but on a 3.2 you have a shit load more volume through the turbine. if the the rear AR is too small then you get back pressure prior to the turbine which not only slows down gas velocity but creates all sorts of issues with cylinder pressure and combustion events. That's why you have to cut boost.

In a 4 cylinder you can run big boost because you haven't got the volume of gas, so exhaust gas speed dosen't suffer and you can run a lot more boost (compessor) through the same turbo because the exhaust gas volume is a lot less, so no back pressure issues therefore high gas speed through the turbine.

In Pete's senario he wants response so who cares about top end power, its really all over by 7000rpm ish and that's where he wants it.

Good turbo for response from lower rpm, crap turbo from 5500ish rpm and up.

Edited June 29, 2015 by XGTRX

[jangles]

That's good and fine to work it all out on compressor maps, but on a 3.2 you have a shit load more volume through the turbine. if the the rear AR is too small then you get back pressure prior to the turbine which not only slows down gas velocity but creates all sorts of issue with cylinder pressure and combustion events. That's why you have to cut boost.

In a 4 cylinder you can run big boost because you haven't got the volume of gas, so exhaust gas speed dosen't suffer and you can run a lot more boost (compessor) through the same turbo because the exhaust gas volume is a lot less, so no back pressure issues therefore high gas speed through the turbine.

In Pete's senario he wants response so who cares about top end power, its really all over by 7000rpm ish and that's where he wants it.

Good turbo for response from lower rpm, crap turbo from 5500ish rpm and up.

I agree, which is why I can't work out why people still want/expect it to be making 700hp

[Nismo 3.2ish]

have to see it through pete!!

I just got to know..

I do not know how to stop, haha

I will do the mods to finish the build off, I do not like taking a chance with the work that has been done. Do the surge tank and pod cover, plus a AF sensor if needed. The idea of making sure I have 1/2 or 1/4 tank before playing would drive me nuts.

I was thinking of trying a bloke in Port Macquarie but do not know anything about the shop.

Everything will be checked out, I have spoken to a shop in Gosford about the work and the tune. He seems to have a good reputation and I can get there and back easily, saves time and money

[Nismo 3.2ish]

6262 is rated at 730hp, if there are no restrictions on the motor it should acheive close to that figure.

Peter, what wastegate and boost controller you got?

HKS, EVC 6 boost controller

Showed Paul some pics and he said it is looks like the old HKS wastegate ?

[XGTRX]

Everything will be checked out, I have spoken to a shop in Gosford about the work and the tune. He seems to have a good reputation and I can get there and back easily, saves time and money

Whats wrong with the tune? I thought it was all sorted

Edited June 29, 2015 by XGTRX

[MagicMikeZ32]

That is alot of boost drop. Either they didn't tune in the controller properly or they are pulling boost for a reason.

Either is likely in this case I suspect.

Covering up an ignition issue, or lazy. Take your pick.