OMG!!! Twins Rock part II

[HoleshotHolset]

Now that the drive pressures have been measured... . the kit proves itself once again. Nice work!



Matt

 

[Mark_Kendrick]

Thanks Matt!



The real thanks goes to Cmonroe. He picked up the torch for me after I nixed the headgasket.



I need to Plug the folks over at Piers diesel. I just called and explained all the work that I plan to do to my truck and the fact that I can't get to them to do it. I spoke to Al. They have to be the most helpful folks on the planet. He answered in detail every issue I had with my p-pump conversion all the way down to the gnats behind.



I've spoken to Piers himself before and he was at least as forthcoming with info. Thanks fellas!!!!!!!!



anyway, back to the twins... ... ... ... .....

 

[TxDieselKid]

Originally posted by Mark_Kendrick



I've spoken to Piers himself before and he was at least as forthcoming with info. Thanks fellas!!!!!!!!



anyway, back to the twins... ... ... ... .....

Mark,

Now that we know the drive pressure, I'll say great work again. That was one issue that I had with your system, and it seems that is not one.



One more note about Piers, I hear he has some HT3b's waiting to move that have been worked over a little.



Andrew

 

[Mark_Kendrick]

I may call him after the p-pump, cam, porting, o-rings, fly cutting balancing...

 

[HoleshotHolset]

Piers is THE MAN! (not the 1st or last time I'll ever say that!)



I wanna know about custom injector lines... . the rest I can deal with.



Matt

 

[StakeMan]

60 psi boost happened pretty quick in cmonroe's truck.

 

[Jim Fulmer]

The BHT3B has a nondivided housing



Sounds like my PDR Garrett HT3B



I spoke to Al. They have to be the most helpful folks on the planet.



Yep they sure are, that's why I use them and always will.





60 psi boost happened pretty quick in cmonroe's truck.



So does mine like 25-60 PSI so quick you can't read the guage, hince the PDR turbo cause that's were it play's.



Funny thing is I have it working allot better down low after Monday in the shop, Motor comes on much quicker

 

[WeirCummin]

Glad to see ya'll u looking @ drive pressures. What I'd like to know is what your seeing down in the lower range, from 0 on up. What I've seen with the VGT is that it's 1:1 down low and decreases as boost comes up. Towing back from the LSTDR rally, DP was less than 1:1 above 10#, mind you I am not pushing this turbo to the limits until all of the fail safes are working properly. Towing up a grade (if that's what you call it in TX) @ 70mph, I was seeing 22# DP and 30# boost.



Jim, I'd like to know what your DP's are.



Dean

 

[Mark_Kendrick]

Not all of us have a technology genie in our pocket. The VGTs are pretty exciting and VERY



The drive pressures that Craig is seeing down low are , for example, 14psi boost to 18psi drive. some where in the 20-30 psi range they equalize then around 60 psi we saw a minor drop (59 psi drive:60psi boost). His setup is not typical of the other sets existing. he is a worst case scenario. he is running an hy30-9 on a stupid pumped 12v with a cam, ported head, and huge injectors. He has more fuel than anybody I know of on the the street. Given that, his drive pressures and EGT are AMAZINGLY low!!!



The typical setup is a hx3512 on top on a 24v that is basically stock except injectors and boxes. MY truck never sees the high side of 1440* even at 85+psi on lethal doses of propane. I have 200+hp injectors, a Quadzilla 65 hp timing box, and a BC wizard FMS. I can turn day into night unil I spool up



I spoke with some turbo gurus and they were pretty impressed with the drive pressures so I am happy. However, I am going to send craig a new tube to connect the exhaust side of the turbos to see if we can't ge t the pressures to drop. the next 'trick' to try is to trim the fins on the exhaust wheel and rebalance it.



My goal is 50psi or less drive at 60 psi boost and an across the board reduction which may be difficult to achieve but not unreasonable to want. At any rate the twins are in good shape now and will continue to be refined until they are the best I can make them.



Thanks,

Mark

 

[StakeMan]

IMO, Craig has to much fuel or HP for the HY35. The HX35-12 should work much better for him. But he will loose the low rpm grunt.

 

[Diesel Freak]

woo hoo... . now I have some numbers to look at!

 

[Diesel Freak]

I can't figure this out!

I have a question about A/R (area/radius)



If I have a Housing with an A/R of . 81 with a turbine with Major diameter of 3. 346 inches (85mm) and an exducer of 2. 846 inches (72. 3) what does that make my housing size in cm^2







any thoughts on this... ... I would like to make some sort of correlation between A/R and cm^2 if given turbine major diameter and exducer diameter.

 

[Mark_Kendrick]

That one is over my head but I'll make a call.

 

[HoleshotHolset]

This is a rounded figure, but that . 81 A/R is probably like a 11 or 12cm² housing... .



A 1. 15 A/R housing is pretty darn close to a 14 or 16cm² housing... .



Sounds like someone has himself a Garrett... . or a Garrett spin-off... no pun intended.



Matt

 

[Diesel Freak]

Originally posted by HoleshotHolset

This is a rounded figure, but that . 81 A/R is probably like a 11 or 12cm² housing... .



A 1. 15 A/R housing is pretty darn close to a 14 or 16cm² housing... .



Sounds like someone has himself a Garrett... . or a Garrett spin-off... no pun intended.



Matt

how did you come up with that estimate?

 

[Mark_Kendrick]

inquiring minds want to know

 

[StakeMan]

Originally posted by KatDiesel

What he did is fine and dandy and creative... more power to him. However when he intends to sell this setup to someone (yes they have been listed in the classifieds since 9/30/02) then drive pressure should be one of the first things tested. When playing with turbos the drive pressure will tell you alot. You don't need a baseline to compare it to... ..... you simply measure the combination and see if its working effecently or not.



I would imagine most poeple don't ask what drive pressure is like when buying turbos, because they either don't care or don't know what it is and how it is important. Drive pressure was discussed when I purchased my turbo.

So what was your drive pressure?

 

[StakeMan]

I wonder if the drive pressure readings would be different on a 24 valve?



But I think the 24v would need to have as much HP as the 12 v.

 

[KatDiesel]

Originally posted by StakeMan

So what was your drive pressure?

been waiting for someone to ask.



which turbo?

 

[Diesel Freak]

KwikSpool HX40?

Original B-1?

KwikSpool B-1?



might as well see how the "Holly Grail" of single turbochargers compare to twins