Homebuild Turbo Truck No boost

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11-20-2012, 03:28 AM

#21

Laurens

0.0 BAR

Thread Starter

Join Date: Nov 2012

Posts: 12

Quote:

Originally Posted by Otay1000

hi Laurens, I think what you need to look at is the different size of the turbo sides you are using. The turbine does indeed have to be sized for the 2.6 litres of your trucks single bank of cylinders. However your compressor is having to flow and compress enough air for the entire 5.2 litres of the whole engine. This is how Saab did it- their compressor was gigantic compared to the turbine side. The reason you are getting oil in your pipework is the Volvo turbo doesn't have oil seals on the compressor- it was fuel injected so therefore blow thru- no vacuum was applied to the compressor seals. the carb is applying huge vacuum and sucking the oil out past the oil deflector. Hope this helps you out! love to see the beast going right.

Oké another update,

I've fitted the new homemade intake dropdown tube. It solved a bit, now at WOT I reach 1.5 Hg instead of 5. This seems to be about the same I got without the turbo setup. In that case, I've resolved the intake restriction problem, however still NO BOOST... Regular power though (maybe even bit better at low RPM)

I know the turbo is small, and I do run it from that single bank, but still I would expect some boost...

I can't do a leak test at the moment (compressor in the garage broke..) but it must be a major leak if it would cause no boost at all, Right?

So to put things simple,

I should see some boost (how little it could be) with this setup right! Or could the setup be so wrong that It will not boost at all?

I did replace the wastegate with another (adjustable one, that was laying around). And still have the CBV blocked off with a plate...

I'm also not sure I'll be adding the crossover pipe soon, as I have to get the car MOT'ed before December...

Any thought on why I don't get ANY boost, and If I should expect even a little boost with this system....

I read stories that the 13C turbo was able to boost the volvo to 18 PSI on the 2.3 Liter, so 7 PSI should be about the same for 5.2 L right?

Any thoughts again? (I'm not ignoring the previous suggestions! But due to time limitation I'm probable not able to create/buy the necessary parts and willing to cut up the original exhaust system before MOT)

Last edited by Laurens; 11-20-2012 at 03:34 AM.

11-22-2012, 11:39 AM

#22

jeremy_nash

0.0 BAR

Join Date: Nov 2007

Posts: 11

Quote:

Originally Posted by Laurens

Any thought on why I don't get ANY boost, and If I should expect even a little boost with this system....

crossover tube will solve your problem. the turbo isn't sized properly to use just 4 cylinders to compress enough air for the v8. either get one of the aforementioned turbo's off the saab, or run your crossover pipe for the turbo you have now.

Last edited by jeremy_nash; 11-22-2012 at 11:39 AM. Reason: grammatical errors

12-03-2012, 08:43 AM

#23

Laurens

0.0 BAR

Thread Starter

Join Date: Nov 2012

Posts: 12

Another update,

Sorry for the late update, been really busy getting the truck ready for MOT.
Long story short, I removed the complete Turbo setup for now. I don't have the time right no to modify the system to work properly.

I do however have a new plan. I'll be upgrading my Offroader (on the trailer in the picture), and plan to add this turbo setup to that (also DodgeW200 ex army truck). This time I'll be using a crossover pipe in order to get the turbo to spin fast enough.

It seemed to work on the other truck, but not enough flow to build boost though... I do also have another 13c turbo, So if I feel like it, I might go twin turbo afterall...

All of you, thanks for the helpfull replies, I'll give an update when something changes!! (might take a while though..)