Racing Performance Works Dump Pipe Kits

[phosty]

That's pity - sounded like an interesting concept. Out of interest, does the FTO Mivec head fit directly onto the 6A13TT block? Would it be feasible with the turbos - I appreciate it requires a new ecu for Mivec control but what other mods would be required? What did you estimate the potential powe/torque gains would have been (and why)?

Whole VR4s are dirt cheap here in the UK now and I doubt FTO's are much different so getting the parts shouldn't be too prohibitive. Just a thought....

[bradc]

lots of turbo honda's delete the vtec system and just use the high rpm cams. I don't think there is much of a gain to be had really, especially with how our turbos spool up. I do however think there are some gains to be had near the redline with getting the stock VR-4 cams reground.

[Nutter_John]

Most evos when going big power just go for an uprated single cam as it is easier to deal with when mapping

[CANDEE]

Most evos when going big power just go for an uprated single cam as it is easier to deal with when mapping

Do you mean a single cam ie inlet or outlet cam replaced, not both??

[Mitsiman]

http://www.rpw.com.au/shop/index.php...=221&Itemid=40

For those interested, continued results of exhaust and the dump pipe package (Our first prototype). Some interesting results

[Nutter_John]

Hmmm yeah interesting , when WRD made a set of Down pipes it added around 30 ft/lb of torque to my car , from looking at your graphs it has done nothing to the power or torque figures .

So with out any tunning i went from around 300ft/lb to 330 ft/lbs of torque , with the map2ecu setup that figure went to 370ft/lb of torque

[Mitsiman]

If you look at the other graph showing the air/fuel ratio versus boost level, you can see the vehicle just got richer and richer. I beleive that what is happening is the car is literally chocking itself to death on excess fuel as there is a gain in hp/tq up to aroudn 5000 rpm range and then it tapers off to match the factory curve. As the next set of graphs show, with some very mild tuning only the gains were immediet and very effective.

[Caveman]

Mitsiman,

When will the downpipe be ready to buy? Any idea on price shipped to the UK?

Cheers,

Mart.

[Mitsiman]

No fixed eta on the down pipe, we have sent our new master sample back for manafacturing, but I would expect about 8 weeks approx. Pricing to the UK would be around $550.00 AUD$ at a guess

[Mitsiman]

For those interested we just finished tuning the vehicle after upgrading the intercooler to a PWR 300 X 210 X 76 unit (Which looks great on the car).

Finished with 206kw at the wheels at 13.5 psi boost. Virtuall Doubled torque up to 4500 rpm, and on the road it goes like a bullet.

Could definitly with some more tweaks I think hit 220kw quite comfortably with our upgraded Version 2 dump pipe, replacement boost control solenoid and upgraded throttle body package.

But have to say, very impressive car to drive. Would love to see how these same mods woudl go on a manuel model.

I will be updating our website in a few days with dyno printouts of the final tune with the haltech unit. Was very easy to do and only took 1 1/2 hours on the dyno to get it set right (this included boost settings as well).

[Nicky123]

But have to say, very impressive car to drive. Would love to see how these same mods woudl go on a manuel model.

Fly to NZ with the parts and you can find out with mine.

[bradc]

upgraded throttle body? is that the whole intake manifold or just throttle body?

[Caveman]

Hi there Mitsiman,

I am about to get an Autronic SM4, intercooler & turbo pipes and new intercooler fitted.

Could you explain what the replacement boost control solenoid and upgraded throttle body packages are in more detail, and why you are doing them? I will ask my garage to do the same if its worth it.

Also, did you see a need to upgrade the actuators - i've heard that's a worthwhile mod.

Cheers,

Mart.

[scocia]

The boost solenoid *might* be the optional electronic boost control solenoid for the haltech miniceptor?

If you head over to the rpw website there is a pretty good explantion of the TB upgrades too.

[Mitsiman]

Just updated our website with the dyno sheets.
The haltech can use the factory boost control solenoid, and removal of the factory restrictor means that they stock solenoid setup is good for around 15 - 17 psi without a problem, although use of hte haltech unit would produce a flatter more stable boost curve.

throttle body means we fit a larger bored out unit with a ported inlet manifold Doesn't do a lot for power, although that is improved, but it does improve throttle response especially off boost.

[Kieran]

...........removal of the factory restrictor.......

Whereabouts is the restrictor? Is it in the standard boost solenoid outlet?

[Kieran]

Whereabouts is the restrictor? Is it in the standard boost solenoid outlet?

Bah, scratch that question, I see it's on your progress blog!

Here's the answer for anyone else who missed it - Bottom of page:

http://www.rpw.com.au/shop/index.php...=221&Itemid=40

[peter thomson]

I thought the 2 steel pipes that are between the wastgates and the solenoid were also retstrictors

[phosty]

Peter, I think the retriction you are referring too is on the upstream HP supply side of the pipework to the wastegate actuators as in the diagram below.



In an earlier thread it was surmised that the upstream restrictor was acheived by the reduced bore of the hard metal pipes rather than a separate element (well, nobody found it).

What is interesting about the findings of RPW is that the solenoid mounted restrictor pill is on the LP pipework downstream the wastegate actuators. It also doesn't seem to feature on the diagram.

As far as my simple understanding goes that should mean you could vent the wastegate actuators at a bigger (faster) rate without that restrictor pill in place.

I'm thinking this might possibly make low boost control a little less smooth (with the actuators being vented very quickly every time the solenoid opens) but give increased headroom for higher boost figures? Does that sound about right?

[Turbo_Steve]

The restrictors will ONLY slow/smooth the boost control: they shouldn't have any effect on the eventual boost pressure at the actuator.

Actually, looking at that diagram again, it doesn't look like the restrictor is for smoothing the venting, but the the 'fill' side of the process: I'd suggest this is to attempt to keep the actuators closed, and reduce lag due to wastegate bleed.