High Revv NA Setup?

[cyde01]

Originally Posted by Freddy@PTUNING

We have hit 207whp on pump gas. Don't know why it's so hard to believe 216whp on E85. Good header and good tune is key.

what does a stock frs/brz typically pull on this dyno? knowing that should clarify everything.

[Matt@Cosworth]

the main issue is cost and the fact the engine needs to be pulled to do any work on the heads
so you've got a big bill before you even start, compared to a FI install which is done over the weekend and gets you a 50-60% gain for starters

new cams and reworking the valvetrain to withstand 8500rpm and then doing something about the oil pump so its stops tailing off over 7000rpm ......

if you can stop the rocker / follower pins from walking out too that'd be helpful
this isn't a K20 and needs a lot of work and modification to get it to 9000rpm more than once

[Freddy@PTUNING]

Originally Posted by cyde01

what does a stock frs/brz typically pull on this dyno? knowing that should clarify everything.

2013s put down around 160whp.

[Starkiller]

What is odd to me is that the torque dip is still there. I always thought that a good header and tune got rid of that.

[Stimmed]

Originally Posted by Freddy@PTUNING

2013s put down around 160whp.

nima314: I was told in Melbourne by a respectable tuner that U.S. dynos are 15-20% more exaggerated than ours. He's been in the industry for two decades too.


Yup thats what we find as well in QLD. Dynos here read about 100rwkw for stock. 160 HP is 120kw so your looking at 15-20% for sure. But in the end power is only a number its about the curve etc and if you want to prove the power that much track/quarter mile times I guess!

[steve99]

Stock cars are so variable on dynos. Tune is to aggressive for a lot of countries fuels and they knock lots and ecu reduces IAM (ignition advance mutliplier) and power drops.

The stock ecu tune also resets the IAM to 0.7 every time you turn the car off. So you can make a stock car read low (im not saying people deliberately do this) by throwing it straight on dyno and doing pulls, unless you have altered the tune to make IAM initial=1 not 0.7

If you drive it round the block a few times the iam will get to 1 if fuel is good and you get the full power. Then put it on dyno without turning ignition off. If the fuel is crap like in australia/south africa the iam will actually go down to 0.3-0.5 and the power will be even less.

IAM less than 1 causes timing reduction and fueling to be richened up in stock tunes

almost every tuner will set the IAM initial to be 1 in their tuned roms, unlike the stock tune

There is so many setup parameters on dynos you get big variations dyno to dyno see chart below stock car.

[Reamer]

Originally Posted by steve99

There is so many setup parameters on dynos you get big variations dyno to dyno see chart below stock car.

Just want to point out this dyno sheet is also in Dyno Dynamics' "shootout mode" where it artificially calculates like a Dynojet (typically reads 12-15% higher than dyno dynamics).

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[Starkiller]

There are even some dynojet dynos that read really low because of heavier 5,000lbs rollers. It is best to look at the percentage of increase instead of overall numbers. Just my thoughts.

[celek]

Originally Posted by Matt@Cosworth

the main issue is cost and the fact the engine needs to be pulled to do any work on the heads
so you've got a big bill before you even start, compared to a FI install which is done over the weekend and gets you a 50-60% gain for starters

new cams and reworking the valvetrain to withstand 8500rpm and then doing something about the oil pump so its stops tailing off over 7000rpm ......

if you can stop the rocker / follower pins from walking out too that'd be helpful
this isn't a K20 and needs a lot of work and modification to get it to 9000rpm more than once

If only someone would come up with an oiling solution... hint hint

[-Willis-86touge]

Question? Isn't the oiling good til about 8100 Rpms? If not what is the safe limit?

[Reamer]

I thought the stock oiling wasn't sufficient in sustained high-g turns at stock redline?

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[Lantana frs]

9000 rpm would mean a piston speed of 5078 fpm. Isnt that a little high?

[sw20kosh]

Originally Posted by Lantana frs

9000 rpm would mean a piston speed of 5078 fpm. Isnt that a little high?

Yes. Most of the tuning shops with built motors in japan are capping at 8200 or so from what I hear.

[sw20kosh]

Originally Posted by Reamer

I thought the stock oiling wasn't sufficient in sustained high-g turns at stock redline?

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Testing at ACS (has a nascar oval section integrated into the track) has show no oil starvation issues at 7450 rpm redline.