Engine/Transmission (1998.5 - 2002) Pdr Hx35

[Sixpack]

Fella's, B-day is coming up and was thinking of a PDR turbo. What kind of reduction in egt's will I see over a stock HX35 with the bombs in my sig?. Boost #'s? I'm assuming at least comparable spool up (or better) than stock. Planning on staying with the stock 12 cm/2 exhaust housing for now. For those of you that have run this turbo, what is your opinion? Don't want to loose my Jacobs e-brake so anything with a 4" down pipe is not an option. Thanks Phil

 

[Bob Wagner]

for 35. 00 more the citydiesel dodgezilla will move a lot more air.

 

[Sixpack]

for 35. 00 more the citydiesel dodgezilla will move a lot more air.

For some reason I thought that turbo required a 4" down pipe... . No? I'll look into it also. I'll be in touch with you also in regards to your latest and greatest product...

 

[jgillott]

I would also recommend the Dodgezilla. It has been an excellent turbo for me. Mine will be coming off soon in favor of a larger single that I recently purchased, but as far as a daily driver/towing turbo. . it has been great.

 

[Turboman]

I had a chance to try out a pdr35-14 about 6 month ago. I noticed a little more lag, a few pounds less boost, and EGT's where a little better, but not a lot. The EGT's would not go as high by about 50* and it would hold there longer, but once I was above 2500 rpm temps would shoot up like before. I disliked the lag more than anything. As long as I'm not at higher altitude, I'm ok with the stock HX35-12 for now anyway.

 

[PC12Driver]

I guess my first question would be what are your egt's now? My second question is what do you use your truck for?



The DZ will move much more air. On top. The PDR35 will have better bottom and mid (as will your stock 35/12). And if you want to use your stock 12cm housing on a DZ (which I highly recommend if you tow), you'll need to figure out a way to adapt your compressor-mounted wastegate actuator to the exhaust housing-mounted version that the DZ uses.



But first, figure out if you really need a larger turbo. The only thing you gain by going to big is lag.



EGT-wise, I probably had about a 100* drop between my DZ and my stock 35/12 with my Mach 2s and Comp on level 1 (EZ mode). With the Comp on 5x5 it was more like 200-300*. But that was at full throttle. Everywhere else, and especially towing, the stocker out cooled the DZ (even more so at altitude).



At your horsepower level the PDR35 will probably net you about the same egt reduction as the DZ with much better spooling.

 

[Bob Wagner]

you can use the stock 12cm exhaust housing with the dodgezilla.

 

[PC12Driver]

How do you mount the actuator?

 

[OPoole]

You would need a older exhaust housing where the actuator just mounts to exhaust housing.

 

[klaybus]

You would need a older exhaust housing where the actuator just mounts to exhaust housing.

Bro,

I might have that older exhaust housing on a ported 12cm... We could compare what you've got vs what I've got in my garage!

 

[Sixpack]

I guess my first question would be what are your egt's now? My second question is what do you use your truck for?



The DZ will move much more air. On top. The PDR35 will have better bottom and mid (as will your stock 35/12). And if you want to use your stock 12cm housing on a DZ (which I highly recommend if you tow), you'll need to figure out a way to adapt your compressor-mounted wastegate actuator to the exhaust housing-mounted version that the DZ uses.



But first, figure out if you really need a larger turbo. The only thing you gain by going to big is lag.



EGT-wise, I probably had about a 100* drop between my DZ and my stock 35/12 with my Mach 2s and Comp on level 1 (EZ mode). With the Comp on 5x5 it was more like 200-300*. But that was at full throttle. Everywhere else, and especially towing, the stocker out cooled the DZ (even more so at altitude).



At your horsepower level the PDR35 will probably net you about the same egt reduction as the DZ with much better spooling.

I tow a 5r that weighs in at 8000# and my egt's are not a real problem that can't be controlled with the right foot and down shiffting a gear. I'm starting to wonder if the upgrade would be worth the $$ for my mods.

 

[Diesel Freak]

for 35. 00 more the citydiesel dodgezilla will move a lot more air.

Really? interesting!!! How much do you consider a lot? because the difference is marginal at best.



FYI, I have a Compressor map for the City Diesel DZ35 (I have posted the un-edited version)... it is not that impressive!!!



I can also post the edited "City Diesel" version if you want.

 

[PC12Driver]

I tow a 5r that weighs in at 8000# and my egt's are not a real problem that can't be controlled with the right foot and down shiffting a gear. I'm starting to wonder if the upgrade would be worth the $$ for my mods.

Well, consider this; before I'd head out on a trip with our 10k 5ver I'd take off my DZ/14 and put my stock turbo back on. The DZ required a bunch more downshifting to fifth, since egts would climb QUICKLY any time I was below 1900-2000 rpm (about 65-70 mph in 6th) and encountered any slight hill. The stocker would make power much lower than that. I could leave it in sixth and pull anything up to about 6% leaving cruise on. Using a 12cm housing with the DZ would help slightly, but then you're trying to push a bunch of air out of a crappy Holset housing and wastegate.



Larger turbos help control egts on the top end at the expense of higher temps down low. If your egts aren't a problem, I think you answered your own question.

 

[Diesel Freak]

Well, consider this; before I'd head out on a trip with our 10k 5ver I'd take off my DZ/14 and put my stock turbo back on. The DZ required a bunch more downshifting to fifth, since egts would climb QUICKLY any time I was below 1900-2000 rpm (about 65-70 mph in 6th) and encountered any slight hill. The stocker would make power much lower than that. I could leave it in sixth and pull anything up to about 6% leaving cruise on. Using a 12cm housing with the DZ would help slightly, but then you're trying to push a bunch of air out of a crappy Holset housing and wastegate.



Larger turbos help control egts on the top end at the expense of higher temps down low. If your egts aren't a problem, I think you answered your own question.

The compressor in the PDR35 is more aggressive at lower (turbo) rpm and actually flows 2. 5 pounds more than the DZ35 compressor (total max flow).



At lower boost levels:



PDR35: 57 pounds per minute @ 21. 6 PSI and 123,000 rpm



DZ35: 54 pounds per minute @ 21. 6 psi and ~ 127,000 rpm





At 30 psig (corrected to 85F and 14. 425 psia) I am using 30 psi as the benchmark because not may people I know need more power than that when towing.



PDR35: 54. 5 pounds per minute and 123,000 rpm



DZ35: 53. 75 pounds per minute and 133,000 rpm



Both turbochargers are at 60% at this point



The DZ35 definately spools slower... . it has to get to a higher RPM to achieve the same air flow as a PDR35.

 

[McDowra]

We can build the "dodgezilla" with any compressor wheel you want if you think the pdr wheel will suit your needs better. We simply use that wheel because it is the one we have found to work best in real world testing. We actually have 2 other wheel we use for special applications we have a wheel designed to operate more efficently in the lower rpm, and we also offer the dz with the super 40 wheel and housing (limited avaliability).



I would be interested in seeing any maps for the pdr wheel as well.

I can also post the edited "City Diesel" version if you want

I dont really know what your talking about edited version the only editing we've done is put our name on it, its a little blurry but the only way I could get holset to send it to me was by fax so...



I havent really had time to look at the map you posted DieselFreak but those numbers dont really sound right, are you sure you have the right map?



Ps I have the map up at our site Dodgezilla map Click the Tech data tab



edit: oh and to answer the original question, I would guess around a 75-100 degree drop staying with your stock housing

-jason

 

[Diesel Freak]

The DZ map on your website is the one I have.



here is the compressor PDR uses.



I am more inclined to use the data of the genuine holset maps... makes an apples to apples comparison much easier.

 

[Diesel Freak]

just a quick note:



at standard conditions, 1 atm (1. 01325x105 Pa; 760 mmHg; 14. 69 psi) and at room temperature 25 C (77 F)



one pound mass of air is 13. 076 cubic feet



the City Diesel map has a correction to 14. 69 PSI and 85F, where the holset map is corrected to 14. 425 and 85F. Everything else being equal, multiply the mass flow rate of the holset map by 1. 018.



now that both ate corrected to 14. 69F, then correct to 77f (536R) that gives us a temperature correction of 1. 015



The total correction factor for the holset map to standard conditions is 1. 03.



to get CFM off the holset map, multiply by 13. 150.



the DZ map is using a conversion factor of 14. 5 I know this cuz I have the EXCEL spreadsheet they used to make the conversion. That is why I call it their "edited" version, you need to devide the CFM flowrate by 14. 5 to get the mass flow rate. After you do that, you end up with the 8574 Holset compressor map.



hmm I guess that was not much of a quick note.

 

[SnoKing]

just a quick note:



at standard conditions, 1 atm (1. 01325x105 Pa; 760 mmHg; 14. 6959 psi) and at room temperature 25 C (77 F)



one pound mass of air is 13. 076 cubic feet

OK, Diesel Freak, help the SNOKING. I have the truck in my sig and tow a 11250 5er. GCW of 18250. I have someone giving me a HX35-12W and was going to send it to Harry to make into a PDR HX35. Given that I have the Banks 4" Turbo mounted Exhaust Brake and mild BOMs, is this going to work for me. SNOKING

 

[Diesel Freak]

OK, Diesel Freak, help the SNOKING. I have the truck in my sig and tow a 11250 5er. GCW of 18250. I have someone giving me a HX35-12W and was going to send it to Harry to make into a PDR HX35. Given that I have the Banks 4" Turbo mounted Exhaust Brake and mild BOMs, is this going to work for me. SNOKING

if you keep it under 35 psi of boost, you should have no trouble at all.

 

[McDowra]

I have the spreadsheet used for conversion as well, but the map on our website is directly from holsets rd dept, seems like they are releasing different maps... I did not realize this.



jason