.50 And .70 Comp Cover

[F6 UTE]

OK, I know XLNT6 - Robin, has tested the 66mm wheel + .70 comp cover and concluded on it's merits.

Today we tested the .50 comp cover back on my car, after running the .70 for a while.

Simon B met me at the dyno to operate it. Tune unchanged from ages ago.

Reason for the change?? Well, it just didn't have the low down grunt like it had, even with the plenum. I concluded the thing has always been a bit lack lustre, even running the 11's a couple of months ago, it just should have had more in it for the 60's I was cutting and the rwkw figure..

So, bolt on .50, go to dyno.

Initial seat of the pants - 'ing heaps more down low.

This was backed up on the dyno when she peaked up to around 24psi @ ~3500rpm ( run aborted!! )

So, pulled out a heap of boost, but was able to command more down low - much more than before..

Even though today was as hot as buggery, and more humid than Anna Kournikovas' hot pants during the Aus open, the barge pulled up ok..

SO, results - why and what they mean....

Low down saw an improvement of ~55RWKW and 105Nm of Torque at a lowly ~3650rpm - Massive Improvement and only upping boost by ~3psi.

Up top at best saw a 10RWKW loss to the .70 cover, but the .50 is down ~2psi up there.. If we can get boost up in the rev range, it should cream the .70 - and my clutch which, btw is still stock and 70,oookm old ..

This tune/combo, although a touch down on the .70 up top romps over it for outright acceleration.

You can see how the torque curve dives harder than Sally Robbins that we cannot get boost in the higher rev range...

Exhaust is thought to be the culprit here, as I replaced the factory centre section a few weeks ago to keep the noise down.. I'll rip that out next week sometime and head down for another go..

On the road, as Simon suggested, it's a tyre fryer. It was before, but now instead of turning them, it just toasts them

So, I have my power back down low - and then some..

Gotta thank Simon for coming down to drive the dyno when he had stuff to do - Much appreciated!!

Next is straight thru centre section to see what's what..

[F6 UTE]

Here is the run with the better top end..

The run above with slightly better mid was let cool for a few mins, but Simon noticed a small puff of smoke, so got off the gas...

[TUFGSR]

Very nice must be a handful now.

Will be good to see once the exhaust is fixed.

When will you head to the track to test it?

[F6 UTE]

Very nice must be a handful now.

Will be good to see once the exhaust is fixed.

When will you head to the track to test it?

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Next outing on a good track is Feb 16th.. SO I want to get it sorted for then. It will run with whatever it has, and I aint changing it again!!!!

[TUFGSR]

Do the exhaust and take it out. With the new found power the times are sure to drop...........if you can get traction, lol.

Christian

[XR06T]

so you think this new tune will give you the power/torque needed at the top end for the line crosses in 4th?

is the net amount under the torque graph going to be more thus going quicker down the qtr? looks like it should with your technique of shiftin earlier than the redline..

I'll come down on the 16th with at least my still cam if you like

EDIT: also is this a better tune for alround driveability (and qtr mile times) than say one like 03xr6t's where his torque curve is alot flatter?

http://www.fordxr6turbo.com/forum/index.ph...ndpost&p=476323

Edited 02/02/07 06:43 AM by XR06T

[F6 UTE]

Vid Cam is always good

As for the other graph. The Sedan exhaust, post cat is alot better than the ute.

All things being equal, with stock exhausts, the Sedan will make more grunt as it's mufflers are more free flowing.

As for my torque curve Vs the other one, Well mine purely makes more. The only time mine dips under 600Nm is ~5400rpm. It may not be flat, but why have a flat torque curve, when you can ramp the torque ( Boost ) early to get the weight moving??

As I say, get the weight moving sooner, the car will always be quicker.. The more power/torque you have available early to do so, the better..

[bcl]

What boost are you making at 2500, 3000 & 3500 revs?

As a rule of thumb (for me anyway) a responsive car has .5 bar at 2500 and 1 bar at 3000.

If you go a bigger turbo and say add 500 rpm lag, I'd want to have my rev range extended for at least 500.

I remember at least 15 years ago that a bigger turbo and more power doesn't necessarily give you a better time over the quarter, especially in a manual. However, it may be more acceptable in a circuit car.

How much lag in rpm do you think there is?

It always feels good having a responsive turbo (as long as you can handle it) .... on the other hand there is something addictive about a big turbo and big power.

Brian

[F6 UTE]

What boost are you making at 2500, 3000 & 3500 revs?

As a rule of thumb (for me anyway) a responsive car has .5 bar at 2500 and 1 bar at 3000.

If you go a bigger turbo and say add 500 rpm lag, I'd want to have my rev range extended for at least 500.

I remember at least 15 years ago that a bigger turbo and more power doesn't necessarily give you a better time over the quarter, especially in a manual. However, it may be more acceptable in a circuit car.

How much lag in rpm do you think there is?

It always feels good having a responsive turbo (as long as you can handle it) .... on the other hand there is something addictive about a big turbo and big power.

Brian

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I didn't actually get the printout with boost, but I'll get Simon to grab one.. I think it's pretty much spot on with your suggestion though..

I really like the response now, and on the circut I hate having to nail the throttle before the apex, it just throws out the finer car control and balance imo.. Better to have the car react to a bit of throttle/brake, than to be too far into the corner to shift weight or position the car where you want.. The corner is over after the apex..

I found with the laggy tune I was running a while ago, my track times were terrible, as the car was basically coasting through the corners, and not under power when you want it..

Lag in rpm... not alot.. It loves 3rd gear from 2k. 2nd gear used to be my favourite, now 3rd gear sweeping corners are really 'entertaining'..

And yes to the big turbo/power, but I just don't know if I could ever sacrifice my low down punch.

[F6 RAPID]

Interesting and I concur with your findings.

Even though my new set-up is not making over 16psi, seat of the pants still says around 400rwkw's, just higher up and longer. However, the biggest difference is not absolutely toasting the tyres like before with that initial spike straight to 24psi - this is much quicker! I can use full throttle in second onwards and not fry the tyres so it is going forward instead of making heaps of noise and being spectacular - which was fun too. Full whack (and I don't expect it to change much) comes on by 3750rpm.

I should go out to the strip now while it is "detuned"........... You were right Ben about that manual gear-change fix thingy in the software - awesome! You can fly through the changes without it falling off boost!

Although, I think this will change when the same as Simon's 21+ comes on board.