183 replies to this topic

[clipping_point]

68 mm from 2.0 SC, bottom view together with std

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•  68mmTB1.JPG   135.44KB   0 downloads

Edited by clipping_point, 15 January 2005 - 10:10 AM.

[Turbo²]

clipping_point: if you add the camshaft on gmpartsdirect you'll find when you "go to the cashier" that inc. all US taxes and so on it vill cost over $600..

[clipping_point]

OK. Thought they didn´t have more than % VAT in California? They don´t ship outside the states BTW. All these prices will add up to something else with shipping, VAT, customs depending on the individual, I guess.

[clipping_point]

Areawise the move from 58 to 68 mm is equivalent to the move from 147 HP to 202 HP airflow-wise. So the 68 mm TB would fit PaulCP:s or ShinyAndys cars really well IMHO. Could free up several HP almost FOC.....................

[vocky]

Pic of modified butterfly screws (I know it's a 68mm TB but it still needs a little bit of improvement ) Basically remove one screw, drill hole out with 3.3mm drill bit, re-thread 4mm, using a counter-sink bit - bore out to allow new 4mm countersunk screw to fit flush, clean away all metal shavings and use thread lock on new 4mm screw - before tightening up. Repeat process for other screw, job done.

Edited by vocky, 15 January 2005 - 02:31 PM.

[vocky]

And to improve the inlet, removed excess material and polished. The brass pipe which can be seen in the other pics is a vacuum pick-up, it just needs blanking off.

Edited by vocky, 15 January 2005 - 02:36 PM.

[clipping_point]

U are the man, can u tune it, u will do it!!!

[clipping_point]

Had to add those Piper cams

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•  Pipercams.jpg   80.09KB   1 downloads

Edited by clipping_point, 18 January 2005 - 05:20 PM.

[JayK]

Nice one mate. 280 degrees sounds good. used 285's on my saxo 8v engine made a huge difference there was no idle, 1500rpm, they cam in pretty high, had my rev limit moved from 6200, to 7000rpm, in the 16v, the 285 allowed from 7400rpm to 8000rpm. I dont think theres much point in cams with on 10 more degrees, go for some wild ones. Althought after a full map, 6 hours on the roller, my fuel injector kept blowing off . Also for them to best work, need to take you are cat's both of them off, like me, huge difference will be see, and a fuel map will give loads of power, cams are nothing with out a fuel/air/timing map.

[JayK]

Also be carefull some cam makers, I.e piper. kent. as there 285 cam for the saxo was a actual 265degree.

[skogshuggarn]

Will "regrinded" cam last as long as new cams?? Any disadvantidges with regrinded cams?

[clipping_point]

Also be carefull some cam makers, I.e piper. kent. as there 285 cam for the saxo was a actual 265degree.

So, you mean they can be fake, the Piper 260°?

Surely hope not!! However I mailed the german V-max firm who said that their regrind just added lift, no duration gain.......

I think a regrind should last egually long as a standard. The whole shaft is hardened, and the profile is normally cut from a hardened cam blank with large diameter AFAIK.

[vocky]

Well actually Piper do list it as a '270' cam but the description clearly states 260 degrees. I think it is just the name as their range has always been '270' '285' etc. As for removing the 'legally' required cat - MOT failure and possibly would invalidate your insurance I would not be very keen. So if you do need more power (who doesn't) then supercharging or turbo is the next route instead of removing the cat.

Edited by vocky, 19 January 2005 - 08:31 AM.

[vocky]

Update for wiring of 68mm TB. Basically there are 8 pins, pin 1 + 2 are for the motor, then there are 2 potentiometers - pins 3 + 6 with 8 as the wiper and pins 4 + 7 with 5 as the wiper. 8 7 6 5 1 2 3 4 pin configuration used, viewed with plug clip at top As the 68mm TB opens the opposite way to the standard TB, the wires to pins 3 + 6 and pins 4 + 7 need swapping around. So that wire 3 goes to pin 6 and wire 6 goes to pin 3, then wire 4 goes to pin 7 and wire 7 goes to pin 4. This changes the potentiometer output to the same as the original. I will update with cable colours once the TB is fitted.

Edited by vocky, 19 January 2005 - 08:41 PM.

[clipping_point]

I just had to try this smiley

[clipping_point]

So its from: 8 7 6 5 1 2 3 4 to: 8 4 3 5 1 2 6 7 ..is it easy to swap it in the connector?

[vocky]

The loom needs extending @ 150mm as the plug has moved 180 degrees, so swapping them with the extensions (whilst soldering them) is a better way.

Edited by vocky, 20 January 2005 - 03:50 PM.

[vocky]

Here are the actual vauxhall plug numbers and wire colours. A B C D E F G H A= blue (goes to A on 68mm TB) B= red/white (goes to H on 68mm TB) C= black/white (goes to G on 68mm TB) D= blue (goes to D on 68mm TB) E= brown/red (goes to F on 68mm TB) F= black/red (goes to E on 68mm TB) G= brown (goes to C on 68mm TB) H= black/brown (goes to B on 68mm TB) Note that the pins E and F need swapping also, this is because the motor works the opposite way as well . The standard inlet manifold only has a 60mm opening , so I would recommend only fitting the 68mm TB with a Venom or dBlias inlet manifold. The standard inlet manifold would also require an adaptor plate to allow clearance for the TB motor over the EGR pipe or the pipe needs modifying / moving slightly . And the standard intake pipework and airbox are also smaller than the 68mm TB neck opening, so would all require replacement, good excuse for a viper

Edited by vocky, 22 January 2005 - 01:37 PM.

[clipping_point]

The standard has a 70 mm ducting and fitting to the TB. What diameter is the neck of the 68 mm TB?

[vocky]

Minimum of 75mm pipework to fit onto the 68mm TB neck