Outer Limits 4x4 Board

The older engines didn't have any wastegates fitted-you're correct. The turbos were so big.
But SOME of the newer engines do, and would be electronically controlled by the ECU, as fail safes if something goes wrong ie: overheating or too high exhaust temp etc. Todays engines have sligtly smaller turbos to assist with quicker spool up, and boost response.

bigpat wrote:The older engines didn't have any wastegates fitted-you're correct. The turbos were so big.
But SOME of the newer engines do, and would be electronically controlled by the ECU, as fail safes if something goes wrong ie: overheating or too high exhaust temp etc. Todays engines have sligtly smaller turbos to assist with quicker spool up, and boost response.

The 280si Isuzu's we got at work have variable-vane turbos. They are the shit. Boost up off idle and all the way to redline, which is 2000rpm.

In fact, without the trailers on them i reckon they would give most turbo diesel 4wd's a good run for their money.

we installed carts' blow off valve on his 60 series today. as he has already said, after intercooling and boosting up to 12.5psi, significant boost spiking and turbo stalling was apparent on gear changes, making a BOV a necessity to prevent damage to the turbo and maintain smooth performance.

the valve was purchased on ebay in one of the worlds fastest ebay transactions ever - bid at 10:29, win auction at 10:30, collect the goods at 12:00. It is a plumb-back type, dumping the excess boost back to the inlet.

the valve was installed to the cooled side of the intercooler, with the supplied fitting welded into the intercooler plumbing, and a custom flange fitting manufactured from a bit of 2mm steel plate and 1.5" tube, grafted to the crossover to receive the blow off charge.

a fitting was tapped into the inlet manifold below the throttle butterfly to provide vacuum to operate the valve when the throttle is closed.

at first the valve would not operate as the preload spring was far too stiff for the minimal vacuum available in the diesel, and I suspect this would be the case with most diesels, even with a throttle butterfly, as the throttle never truly closes in most diesels. after a rummage in the spring box we made up a soft spring which caused the valve to operate as required. no more nasty boost spikes, quicker spoolup between gear changes, and almost silent operation.

just to top it all off we fitted up the EGT gauge and took it for a hard run, and couldn't get the EGT's over about 475C (uphill 130km/h in 4th) so there is potentially more to be had from this setup.

Have you disconnected the pulmb back and gone for a cruise yet???

droopypete wrote:

mickyd555 wrote:this might be off topic, but what is the noise that a semi makes, kinda sounds like a blow off, but more of a whislte than a "choooo"...........

It is a scientifically proven fact that the combination of Coke a Cola, amphetamines and hamburgers results in uncontrolable flatulence a condition which is exaserbated by a high body fat coefficient and low IQ.

The noise you hear from the truck, is the driver "letting one rip", and the reason that some trucks make this noise and some don't, is that some of the smarter operaters have installed "reticulated methane injection systems" in their trucks, using a bell shaped intake made from Teflon coated titanium installed in the seat that channels the recycled methane into the intercooler where it's temp is reduced to 50c it then follows the same path as the regular air charge, making a "super mega mix" of oxygen/methane which results in an average 12.7% H/P gain, that is why you regularly see truck drivers drinking Coke and eating hamburgers when asscending a steep grade, they are quite simply riching up the mix, sadly, it also explains why they are always on their own.

A negative side to the "reticulated methane injection system" is that the methane is so volitile, all plumbing must be made from Teflon coated titanium and the seals are constucted of uranium depleted polystyrene and must be replaced after 5000 liters of Coke (or about 10 days) and mechanics must wear a full protection body suit (with respirator).

I hope this helps.
Peter.

you see so many truckies having a smoke whilst driving. how can they take such a risk? even the slightest leak could be potentially faital.

droopypete wrote:

mickyd555 wrote:this might be off topic, but what is the noise that a semi makes, kinda sounds like a blow off, but more of a whislte than a "choooo"...........

It is a scientifically proven fact that the combination of Coke a Cola, amphetamines and hamburgers results in uncontrolable flatulence a condition which is exaserbated by a high body fat coefficient and low IQ.

The noise you hear from the truck, is the driver "letting one rip", and the reason that some trucks make this noise and some don't, is that some of the smarter operaters have installed "reticulated methane injection systems" in their trucks, using a bell shaped intake made from Teflon coated titanium installed in the seat that channels the Cinto the intercooler where it's temp is reduced to 50c it then follows the same path as the regular air charge, making a "super mega mix" of oxygen/methane which results in an average 12.7% H/P gain, that is why you regularly see truck drivers drinking Coke and eating hamburgers when asscending a steep grade, they are quite simply riching up the mix, sadly, it also explains why they are always on their own.

A negative side to the "reticulated methane injection system" is that the methane is so volitile, all plumbing must be made from Teflon coated titanium and the seals are constucted of uranium depleted polystyrene and must be replaced after 5000 liters of Coke (or about 10 days) and mechanics must wear a full protection body suit (with respirator).

I hope this helps.
Peter.

LOL mate i just printed and gave this to my old man. He loved it (i think he`s still under the effects of reticulated methane injection from his last overnighter )

Mudzuki wrote:Have you disconnected the pulmb back and gone for a cruise yet???

Yep. And it sounds 'fully sik.' I think it really puts people off seeing a cruiser with a BOV. Just not what they are expecting.

revin wrote:LOL mate i just printed and gave this to my old man. He loved it (i think he`s still under the effects of reticulated methane injection from his last overnighter )

Peter.

carts wrote:

Mudzuki wrote:Have you disconnected the pulmb back and gone for a cruise yet???

Yep. And it sounds 'fully sik.' I think it really puts people off seeing a cruiser with a BOV. Just not what they are expecting.

heheh yeah you can hardly hear the turbo over the 6 cylinder diesel roar, and it really doesn't go that fast, so people really look when it goes "Psssssht" on gear changes. I think with a few more psi boost it'll crack a 20 second quarter