Member Profile - Peadya100

[peadya100]

I'll scan the graph at work and post it up. Sadly Mick couldn't lay it over my old tune so you can't see the improved areas, but I did a little hand sketch and it shows 20kw gain from start to finish... very happy! And your headers actually made the car quieter on normal driving jackson... and just a little bit deeper on wot.

[ferret89]

I'll scan the graph at work and post it up. Sadly Mick couldn't lay it over my old tune so you can't see the improved areas, but I did a little hand sketch and it shows 20kw gain from start to finish... very happy! And your headers actually made the car quieter on normal driving jackson... and just a little bit deeper on wot.

Nice! Great result, 212kw on 98

How was spool with the new headers, anymore lag?

[peadya100]

It's actually better than my last tune.. however the last tune had a strange boost graph. Hits full boost (19psi) at 3800rpm. But it hits 18psi at about 2800rpm. So it feels very responsive. Not laggy at all. I'll post a temp photo of the graph tonight until I scan it.

**edit** Graph posted. Graph shows S# vs Sport

[THE SpecB]

Nice output! Correct me if I'm wrong but isn't 19psi and the power your making getting into the danger zone for head lift etc?

I recall 18psi to be the max for a stock internal EJ25

[peadya100]

Nah 19psi is the standard for all of MSR's liberty tunes. I've heard the 21-22psi figure thrown around for head lifting.
I've also heard people much more knowledgeable than me say it's not the psi, it's cylinder pressure or something like that?

Other tuners such as Matt (kido) talk about lower psi tunes but he quotes the psi at peak power which is where the boost has fallen off... in my case it would be 14psi.

[jacks-GTB]

looks like 18psi at 2400 & approx 125awkw??....and with that figure...my spreadsheet says - 497nm @ wheels at peak torque

[peadya100]

looks like 18psi at 2400 & approx 125awkw??....and with that figure...my spreadsheet says - 497nm @ wheels at peak torque

No complaints with that figure!! Thats a tonne of torque. Do we lose about 25% from engine to wheels for torque?

[KiDo_Tuning]

Heads lift from torque(actual combustion energy) which is usually based on engine load which is the amount of airflow in the cylinder during combustion(how full and thus how explosive it is)

The low rpm torque is from TC: http://en.wikipedia.org/wiki/Torque_converter and The engine is applying power to the impeller but the turbine cannot rotate. For example, in an automobile, this stage of operation would occur when the driver has placed the transmission in gear but is preventing the vehicle from moving by continuing to apply the brakes. At stall, the torque converter can produce maximum torque multiplication if sufficient input power is applied (the resulting multiplication is called the stall ratio). The stall phase actually lasts for a brief period when the load (e.g., vehicle) initially starts to move, as there will be a very large difference between pump and turbine speed.
This bumps up roller torque if the roller start speed is close to torque, thus why its making torque at start speed. Sure the headers are allowing it so thats the added bump up but falls off so quickly when compared to any manual car So in essence you have picked up say 20% more crank torque

As a rough indicator, 150Kw@2800rpm is 660Nm of crank torque

[peadya100]

Heads lift from torque(actual combustion energy) which is usually based on engine load which is the amount of airflow in the cylinder during combustion(how full and thus how explosive it is)

The low rpm torque is from TC: http://en.wikipedia.org/wiki/Torque_converter and The engine is applying power to the impeller but the turbine cannot rotate. For example, in an automobile, this stage of operation would occur when the driver has placed the transmission in gear but is preventing the vehicle from moving by continuing to apply the brakes. At stall, the torque converter can produce maximum torque multiplication if sufficient input power is applied (the resulting multiplication is called the stall ratio). The stall phase actually lasts for a brief period when the load (e.g., vehicle) initially starts to move, as there will be a very large difference between pump and turbine speed.
This bumps up roller torque if the roller start speed is close to torque, thus why its making torque at start speed. Sure the headers are allowing it so thats the added bump up but falls off so quickly when compared to any manual car So in essence you have picked up say 20% more crank torque

As a rough indicator, 150Kw@2800rpm is 660Nm of crank torque

Wowee!! You really know your stuff Matt!
But all that was too much for me to comprehend haha
So if I'm interpreting it right, manuals hold torque better than autos? And your saying my car would have approx 660nm at the crank/engine?
My previous dyno graph doesn't have the torque graph on it so it would have been great to get a torque figure as a direct comparison... but based on bum dyno I'm going to agree with your 20% increase matt

[Manaz]

That's extremely impressive Adam, I bet you're stoked!

[shav]

This is awesome Adam. Great output. More torque is a great thing in my opinion.

[HardwareBoB]

MSR says a 100 cel cat will improve down low responsiveness.
Doesn't hurt peak power.
Didn't seem to cause my car too much distress, it's going so well now!! It's a big call but I think it'll run 12.5-12.7 territory now.

I'm running similar power (http://i.imgur.com/GKXgU5H.jpg 227kw) , and I'm hopeful for a 12.6, but anything under 13 I'd be happy. I think a 12.7-8 is more realistic though. My time would be more variable than yours though due to slushbox vs gear smashing. It would be very interesting to run our cars next to each other

[peadya100]

Yeah time will tell i guess... ive already run a 13 flat with substantially less power, and could have got a 12.9 with a better brake boost off the line. That's why i was thinking a potential mid 12. But as i said, time will tell.

[owen]

Nah 19psi is the standard for all of MSR's liberty tunes. I've heard the 21-22psi figure thrown around for head lifting.
I've also heard people much more knowledgeable than me say it's not the psi, it's cylinder pressure or something like that?

Other tuners such as Matt (kido) talk about lower psi tunes but he quotes the psi at peak power which is where the boost has fallen off... in my case it would be 14psi.

I used to run 22.8psi on P100. No lifted heads.

[peadya100]

I used to run 22.8psi on P100. No lifted heads.

Well there you go... 19psi maxes out a VF52 pretty much anyway.