Stage 2 tune 6TTS9E & 890NM Clutch -

[Mc F]

Got my toy back from James, Ken & Adam down at Nasa.

It needed a new clutch & I am glad I went with there recommendation of the 890NM.

I find it very similar in feel to the X50 clutch I had on mine before.

Anyhow the boys also fettled the car a little & hopefully Ken will put up some data for those interested.

Don't get too excited though mine is a Cabriolet so a bit lardy, although I fancy my chances with most now... Good work boys the car feels transformed from standard.

Somebody mentioned something about K16/39g's....good job I don't know what they are on about.

[Vixpy1]

I'm still on the standard clutch

[996ttalot]

Vixpy1 said:

I'm still on the standard clutch

You need to try harder Charlie - couple of dyno pulls should do it.

Well Anthony's was already slipping before any upgrades so no point in putting an X50/GT2 one - gives no room for performance enhancements, if desired in the future.

Will get the data together and post up later.

[Mr Freefall]

Vixpy1 said:

I'm still on the standard clutch

Still with the 24/26's Charlie?? or have you moved one to bigger ones yet??

Gary

[996ttalot]

So 996 turbo s (e.g. k24 turbos). Added tune, dvs, filter and 5fpr.

We weren't able to run prior numbers because of time and weather delays, and finding cab numbers has been a nightmare, but we have as standard 0-100mph in 9.2 (coupe 9.0) and 0-200kph in 13.6 (coupe 13.3)

We were kindly asked to bed the new clutch in with a 0-100 time and recorded a 8.3secs to 100 with a 0-60 of 4.0. That could be improved a little.

The 0-200kph was improved by 2 seconds to 11.6 and that is reflected in the 60-130 time as well. We never seems to hook up the right run as reflected by the two diagrams below. We recorded 8.48 and 8.67 with the former having a 0.3 slower 60-100 time. Suspect with better conditions and more time, an 8.3 is in her. Certainly the coupe would be quicker.

So that is about 0.5 better than a k16 stage 2, which is about right e.g. the k24 has the bigger pull once on boost.

Same testing conditions as always to give a fair comparison

[ZeroH]

Solid times given the cabs extra weight - I notice that the limiters been raised tho but good to see the lambdas within their usual tight band

[Vixpy1]

Mr Freefall said:

Still with the 24/26's Charlie?? or have you moved one to bigger ones yet??

Gary

Still on K24/26's Gary, Staying that way for a while i think

[996ttalot]

ZeroH said:

Solid times given the cabs extra weight - I notice that the limiters been raised tho but good to see the lambdas within their usual tight band

The limit is raised to keep it within the range 1, since range 1 are irrelevant.

5fpr is the right way to go on these.

[kencom]

I think you're right Ken, even at 1.05bar my x50 manual was nearly running out of fuel with a EPL tune from the US. Just has forge 1bar actuators fitted with the yellow springs & set to crack open at 13.5psi. Awaiting delivery of a Bosch Motorsport 'true' 5bar FPR before retuning to a max of 1.2bar.

When done & tune dialed in properly I will post results & Durametric data, no Performance meter unfortunately, missed a few on flea bay over the past few months!

[996ttalot]

kencom said:

I think you're right Ken, even at 1.05bar my x50 manual was nearly running out of fuel with a EPL tune from the US. Just has forge 1bar actuators fitted with the yellow springs & set to crack open at 13.5psi. Awaiting delivery of a Bosch Motorsport 'true' 5bar FPR before retuning to a max of 1.2bar.

When done & tune dialed in properly I will post results & Durametric data, no Performance meter unfortunately, missed a few on flea bay over the past few months!

Well that is all we are running, just 1 bar basically. And the fuel duty cycle averages 84% over that pull with the 5fpr.

Clearly you have to tune for the 5fpr.

On the cracking pressure we tend to stick with 12.5psi for 1 bar boost since 13.5 would be too close. 13.5 would be fine for 1.2 bar, but wouldn't recommend more than that.

Hope it all works out for you and keep us updated.

[ds666]

Is this with a standard exhaust ?

[996ttalot]

ds666 said:

Is this with a standard exhaust ?

Actually no. We fitted his tubi exhaust 200 cell during the summer. Forgot about that in my post

[kencom]

996ttalot said:

kencom said:

I think you're right Ken, even at 1.05bar my x50 manual was nearly running out of fuel with a EPL tune from the US. Just has forge 1bar actuators fitted with the yellow springs & set to crack open at 13.5psi. Awaiting delivery of a Bosch Motorsport 'true' 5bar FPR before retuning to a max of 1.2bar.

When done & tune dialed in properly I will post results & Durametric data, no Performance meter unfortunately, missed a few on flea bay over the past few months!

Well that is all we are running, just 1 bar basically. And the fuel duty cycle averages 84% over that pull with the 5fpr.

Clearly you have to tune for the 5fpr.

On the cracking pressure we tend to stick with 12.5psi for 1 bar boost since 13.5 would be too close. 13.5 would be fine for 1.2 bar, but wouldn't recommend more than that.

Hope it all works out for you and keep us updated.

Ken

Any reason why you don't go for more than 1bar on the K24's?

From what I have seen most tune for around 1.2bar.

[kencom]

I'd also be interested to know how the car picks up boost from say 2000rpm in 3rd gear at WOT.

Mine felt a tiny bit lazy before, I hope hat the uprated actuators bring h boost in more aggressively, I like the feeling!

[996ttalot]

kencom said:

996ttalot said:

kencom said:

I think you're right Ken, even at 1.05bar my x50 manual was nearly running out of fuel with a EPL tune from the US. Just has forge 1bar actuators fitted with the yellow springs & set to crack open at 13.5psi. Awaiting delivery of a Bosch Motorsport 'true' 5bar FPR before retuning to a max of 1.2bar.

When done & tune dialed in properly I will post results & Durametric data, no Performance meter unfortunately, missed a few on flea bay over the past few months!

Well that is all we are running, just 1 bar basically. And the fuel duty cycle averages 84% over that pull with the 5fpr.

Clearly you have to tune for the 5fpr.

On the cracking pressure we tend to stick with 12.5psi for 1 bar boost since 13.5 would be too close. 13.5 would be fine for 1.2 bar, but wouldn't recommend more than that.

Hope it all works out for you and keep us updated.

Ken

Any reason why you don't go for more than 1bar on the K24's?

From what I have seen most tune for around 1.2bar.

We could have been more aggressive as suggested, but we were trying to maintain the boost levels across the power band without significant impact on IATs. The k24s can be run at 1.2 bar which is moving closer towards their stall limit so it is a compromise. Was aiming for all round performance rather than out and out power. This car is strong over 130 as well

[kencom]

I will log IAT's, as well as the usual parameters when I get it tuned. Probably in the next week or two.

[GT2 ETR]

996ttalot said:

Well that is all we are running, just 1 bar basically. And the fuel duty cycle averages 84% over that pull with the 5fpr. .

Thanks for sharing all the data, this is being totally open and upfront.

Just one point of precision, peak boost is close to 1.2 Bar at 4458 RPMs, not 1 Bar, so is peak torque at those RPM levels obviously.

Another point is that the run has a circa 2% downhill slope (8 Meters for approx 400m distance based on my calcs). However for comparison vs the K16 this is totally valid as they both have a similar slope.

Edited by GT2 ETR on Monday 14th November 20:03