Capa Performance Parts

[cdm]

  Street Tuner said:

The clutch is ragged. The torque can slip it in 4th and 5th at that magical 3000rpm kick off point.... The T5 is no thing of beauty though, that's for sure.

Does the CAPA clutch kit fix this? Or don't you have it fitted? Is there anyway we can refine this box, I don't particularly fancy spending 8K for a six speed. Hearing that the box sounds like a clapped out 3 speed is making me think maybe I should have stuck with the auto..

[Street Tuner]

  cdm said:

Does the CAPA clutch kit fix this? Or don't you have it fitted? Is there anyway we can refine this box, I don't particularly fancy spending 8K for a six speed. Hearing that the box sounds like a clapped out 3 speed is making me think maybe I should have stuck with the auto..

The uprated clutch is being fitted Monday. Read the post, the box sounded sh*tty from day one. Hasnt got any worse. The T5 is never going to be a beauty of a trans, you only need to drive some decent performance cars to realise this. However, it should suffice. CAPA has a cooler and pump kit along with their lubricant, being fitted to this car, which should make it last the distance....that being our magical 250,000km

[Guest Fijneman]

Last 250,000ks? How are you going to measure this? The average vehicle travels 20,000ks a year so this test of yours well require 12.5 years to see the results; unless your going to run your xr6 like a taxi and pull it off in under a year, but this isn't a good test as it has very little cold starts which is when most engine damage occurs.

[WBT56]

Be very carefull driving the car hard with a heavily uprated clutch. The factory clutch is rated to be marginal at best to protect the T5. The same theory is used in the AU Brute Utes.(they use identical pressure plates). Under hard driving, the clutch flares to absorb some of the shock load. Other mods you speak of are right on track. What you are doing is the best way of protecting the T5, there is no way of making it any stronger, as it is already a Z rated box.

[Street Tuner]

  WBT56 said:

Be very carefull driving the car hard with a heavily uprated clutch. The factory clutch is rated to be marginal at best to protect the T5. What you are doing is the best way of protecting the T5, there is no way of making it any stronger, as it is already a Z rated box.

What an intelligent piece of posting. I agree with you re the clutch all the way here, which is why the kit - which once more I have had some input into - will still feature an organic plate, and have only slightly altered clamp loading. Its a matter of riding the ragged edge, providing transmission cushion, but not letting the clutch fully open vs torque.

The 'magical 250,000km' is not reference to covering this distance with the car in question, but rather an inidcator that thermal management of ALL system components will be addressed to keep their loading as per a factory vehicle. That goes for differential, gearbox, and engine. If you can make the power AND keep the thermals within original limits, you WILL last the distance. Word of warning though, its not easy!

[Guest Fijneman]

  WBT56 said:

What you are doing is the best way of protecting the T5, there is no way of making it any stronger, as it is already a Z rated box.

Ever heard of cryogenic threating?

[CnC]

Street Tuner:

Can you please answer the following questions:

- Why isnt the factory computer remapped? Shouldnt high boost (11-12psi) mean that ignition timing needs to be retarded slightly to compensate for this?

- How marginal is the fuel system, what safety margin is there here?

- How well does the stock intercooler hold up with 11-12psi boost?

- What scope is there for further boost increases and hence power increases? Is this possible on a internally stock motor?

- Is a 3.5" exhaust better than a 3" exhaust on these cars, ie does a 3.5" system make make additional power over the 3" system?

- Is the dump pipe off the turbo as good as is rumoroed or does it need to be replaced?

- Is there any way that the boost threshold of the engine can be bought lower in the rev range? Even though the XR6T has less lag than most cars im sure a lot of people would like a little more bottom end if possible.

- Can you possibly overlay your latest dyno over your initial dyno run so that we can compare how and where the torque is increased?

Answers to these questions would be of great help to the XR6T community.. but I suppose commercial gain may be above all else

  Quote

This forum, however, doesnt share the same general vibe, the same excitement or enthusiasm of the LS1 guys. Look at the shut TSI thread where there was some legitimate debate and over moderation.

I agree with the above, free discussions of a technical nature benefit everyone, and why not have some spirited discussion on such matters, after all that's exactly the kind of thing that competition should be all about..!?!.. but maybe I should keep quiet and uphold the party line or I may be put onto the commies' blacklist..

[Falchoon]

Keep asking questions CnC!

I've got a couple now...

Does anyone (Tuna?) know how the auto will hold up with these mods?

Could auto possibly be quicker in accelleration?

[CnC]

You must ask the tough questions I seriously doubt he will provide answers to the questions for 'commercial' reasons but I would love to be proved otherwise..

[Street Tuner]

CnC, I laugh when you try to draw me into these type of debates, but in the spirit of knowledge in an open forum I will fill you in -

1) None of the companies currently offering upgrades for the XR6T remaps the computer. Its a case of intercepting and processing signals (but not just in an analog fashion), minus all the 'smoke and mirrors' being currently flaunted by various companies in an attempt to gain greater technical credibility in the eyes of the public. I have been trying to 'crack' the protocol for serial programming the standard computer for several months now. No one is any closer. That I can assure you.

The healthiest and happiest XR6T combos will have the greatest control left to the stock computer. Fact. It knows best the ignition timing, which is adaptive, and trimmed both long and short term. I believe that there would be more power in my care with an EXTRA couple of degrees timing, not any less.

2) The fuel system used is capable of supplying 350rwkw of fuel. There is much margin

3) The stock intercooler is fine with 11psi, losing maybe only 1.5 - 2.5psi across the core at that boost level. While that's a fair bit of pressure loss, the benefit is a core that scrubs the air very effectively and removes a lot of heat. Working in conjunction with the water spray kit its possible to sit 10 deg above ambient at full load on a 25 deg day

4) There is obviously more left in the engine. Probably not left in the turbo. Rather than try and optimise the 240T for big power we have instead concentrated on maximising Nm at 3000rpm. I wouldnt be too worried about the strength of the internals

5) The standard exhaust system, lightly modified, is the measure of any aftermarket type. Its twin, nicely bent, 2.25 inch stainless with a 1 in 2 out large biscuit cat. Look for a full backpressure report in Zoom. It will surprise you

6) Off the back of the turbo the casting is a nice looking piece of gear. that's about as technical as I have got with this piece

7) Yes, put a smaller turbine housing on it! Other than that, not that I am currently aware of

I have changed dynos which makes it a real bummer, but I can tell you where the current car peaks torque at 2800rpm, and makes over 100Nm at the rear wheels more than the stock car at teh same point. that's a heap

Hope that was helpful enough