Competition Newest set of twins

[Mark_Kendrick]

https://www.turbodieselregister.com/forums/showthread.php?s=&threadid=70296





Well????



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[Jim Fulmer]

Looks good Mark, seems like you can keep the Battery with the way it's setup, what's the idea with 2 wastegates? Think I know and it would be cool to see how it works, lots of control.



Jim

 

[Mark_Kendrick]

The second gate isn't being used though it is functional.

 

[Mark_Kendrick]

better pics

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[83 crew cab]

looks good mark have you every had any problem with the clamp on exhoust hlousing of the primmary turbo George

 

[Mark_Kendrick]

Thanks

No problems to date.

 

[Jim Fulmer]

Mine either, but I'm going to support my set from the motor mount with a a couple of hyme joints and threaded rod just to take the strain off of the manifold.



Jim

 

[TxDieselKid]

So what is the new set mark? you had no problem talking about the last set!!! :-laf



They look sharp brother, great job!



Andrew

 

[Chipstien]

Jeez Mark, could you put a bigger picture on here for us. I am having a hard time just making out what it is. Thank goodness I have a cable modem. BTW, nice setup.

 

[Mark_Kendrick]

There, I sahrunk the picture



TDK,

it's a Hx35W-14 with a HX40 compressor. The primary is a BHT3B-26.





Later,

Mark

 

[MY6EATSV8'S]

2 gates have been around for a while now and work great

 

[TxDieselKid]

Dang Mark, I was just razzing ya a little.

 

[Hammer]

Mark...

I have a few questions on these for you.....



1-Why is the primary compressor airflow tubing not stepped up sooner in size instead of just enlarging the tubing diameter at the secondary compressor wheel??. One would think it not only would disturb the airflow going into the secondary wheel but also will limit the amount of air you can flow with the secondary wheel.

2-Why is the exhaust tubing from the 14 housing to the 26 housing at such a abrupt angle??. Flow around abrupt angles or bends has been a killer to performance and is widely known.

3-The wastegate that is in use and mounted upon the exhaust near the maniifold exit has really got me baffled. It brings to mind 2 minor things. Is it being used to control flow into the 40/14 housing to make it live longer as we all have seen what happens with these hybrids when overdriven(seems like someone else has already tried and done this deal)??. With where its mounted and integrated into do you not feel the 26 housing and its better flow would open the gate prematurely thus killing any chance of low end spoolup??.



Concept is good,but,in my opinion,the 40/14 is going to be a weak link even gated at or below 50lbs of boost. I have seen and know of the internal destruction that can be done using a 40/18 and a H2E/21 in thse setups. with them having a stronger shaft and bearing setupo this is why I am wondering why the choice of the smaller hybrid. Any ideas to help clear this up... ... . Andy

 

[Mark_Kendrick]

-Why is the primary compressor airflow tubing not stepped up sooner in size instead of just enlarging the tubing diameter at the secondary compressor wheel??.

smaller pipes have less volume. This preserves velocity and reduces lag.



The 40 (on this HX35) compressor wheel is just over 2" at the opening. 4" pipe is only needed to seal the pipe to the compressor housing.

Why is the exhaust tubing from the 14 housing to the 26 housing at such a abrupt angle??. Flow around abrupt angles or bends has been a killer to performance and is widely known.

That is a 3" manrel 90* on a 4" radius. The pipe is larger than the exhaust outlet of that HX35 and it is as long a radius as possible to keep clearance at the firewall.



Besides. . it's a mandrel 90. . that's as not-abrupt as you can get.

The wastegate that is in use and mounted upon the exhaust near the maniifold exit has really got me baffled. It brings to mind 2 minor things. Is it being used to control flow into the 40/14 housing to make it live longer as we all have seen what happens with these hybrids when overdriven(seems like someone else has already tried and done this deal)??. With where its mounted and integrated into do you not feel the 26 housing and its better flow would open the gate prematurely thus killing any chance of low end spoolup??.

The hybrid is not overdriven at all. It is wastegated. the internal wastegate only vents 3 cylinders. The external gate and the spacer it sits on serves 2 purposes. First to merge the exhaust streams so that all 6 cylinders get vented. Second that wastegate is a 43mm, piston actuated badboy. It will turn that turbo of like a light at whatever pressure I set it for. It will spool as hard as I want and no further.



The large wategate and the small exhaust housings are what gives my setup extemely good driveability and (so far. . no failures) longevity. The small turbo is driven drastically more conservatively the other twin turbo setups that use no wastegate at all or a gate tied to the side of the turbo that vents to somewhere past the primary.



I have used this with a HX35W-12 / HT3B-32, an HY30W-9 / BHT3B-26, and an HX35W-12 / BHT3B-26 and none have any problems with spool-up, boost control, turbo, or wastegate failure.



So No, I Don't feel there is any chance of killing low end spoolup.



I hope this answers your questions,



Thanks,

Mark

 

[Mark_Kendrick]

Originally posted by TxDieselKid

Dang Mark, I was just razzing ya a little.

What were you expecting. . "buy some and find out?" . . NOT

 

[Snow man]

Mark,looks good! I like how you piped the intake under,it must look much cleaner from the top. What boost levels will you wastegate this system to? The 35/14 40 compressor is sweet. With your wastegates keeping that turbo alive should be easy.

 

[TxDieselKid]

Originally posted by Mark_Kendrick

What were you expecting. . "buy some and find out?" . . NOT

With it being me asking, yes I did expect that answer!! :-laf

 

[Chrisw]

Mark, How much do you want for it. I need one of them on my truck.

 

[Jim Fulmer]

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Old and present wastegate setup



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Were the wasted air dumped in the old system



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As of last night I had the old system, now I too run a Divorced setup on my Twins, there is a story behind it so on to the next page.

 

[Jim Fulmer]

If any of you follow the TDR then you know that I finally found the end of my stock head gasket not too long ago, as I was pondering about changing it and O-Ringing the head I decided to get a Stage 2 head from PDR with the O-Ring job done along with some other goodies, Laser DV's, a PDR custom plate(buy enough they will cut you one) studs for the head, a . 020 gasket, 18cm housing(gift) and the new inter cooler boots. So I install all of the stuff and put the plate in the middle, bump the timing to 18 and start testing..... huge gain over my last setup and I'm running 1400 EGT in valet mode with a 18 housing on the little turbo(remember that number) I put . 025 more plate in and gain a bunch again and valet mode is pegged 1550(dipricol gauge) I then add a little more plate with not much gain if any(end of gain in rack travel) I then take the timing to 20, big gain... big seat of the pants, EGT's pegged in valet and full fuel will peg the gauge in 3 seconds.



Yesterday Mark called me and asked if I had given anymore thought to doing the by-pass method and I said yea I had thought allot about it but I'm tired of working on it (2 weekends in a row) so later I go over to a buds shop and he has some 1 5/8 header pipe left over from a custom header job(baby small block stuff) so I grab it come home tear the truck down make the changes and put it back together. Today I take it out testing, the spool up is about the same, maybe a little quicker but not much like . 2 seconds cause I have enough fuel now that I can go from a 8psi launch and hit 60 PSI in about 1. 5 seconds, but what I noticed is it hits harder, obviously the big turbo's air and it hits hard enough to load the chassis... . weird! Drive pressure is up just a bit 5 PSI, 55 lbs boost..... 60 drive and 65 PSI boost 72 drive but here is the kicker, egt's in valet mode are 1300 now... . look back at the old numbers, that's at least 250 degrees drop in EGT's, power is up but I don't know how much and yes in full fuel mode it will peg the EGT's still. It seems that I still have plenty of control over the boost as I started out in the setting phase at 45 lbs, I sit here and laugh that it worked but who is to say that the old way didn't work or this way is better, well now you have the data and as far as I know no one here has done it both ways, anyone with a wastegate setup like ours can do this easily. Were it puts me in and odd situation is there are several people that have contacted me about Twins I have furnished info to them and they have built there systems like mine, so to those I apologize but we live and learn.



Another thing is you can really hear the big turbo working hard now..... distinct scream at 70 PSI.



I could have just kept this too myself but it seems Mark is taking hits from folks that don't understand so now you have some before and after data.



Your truly, Jim (I'm learning) Fulmer