Question for the turbo Gods

[Diesel Freak]

I have been hearing lots about the HX-40 grenading itself. I am assuming that this is happening since the HX-40 was designed for continuous boost applications and not the high boost to no boost transients that some of the more heavily bombed engines are placing on it. I have been kicking around the idea of a ported head with dual HX-35 turbos in parallel with either 10 or 12 cm housings. This would give the benefit of a more free flowing exhaust with two smaller turbos that can handle large transients better than the
HX-40.

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2001 ETH-DEE, Diablo Power Puck, Bosch 275's, Practical Solutions Boost Module and Elbow, LFT Silencer Ring Eliminator, K&N, Straight Piped http://www.mudrunner.sites.cc

[This message has been edited by cdaledh (edited 04-23-2001). ]

 

[Todd T]

then you have the cost of porting the head and down time from that, combined with the cost of a second turbo for the sake of hoping it wont blow up a HX40.

hummmmmm. .


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Todd,
2001 Q-cab SB 4x4 5spd 3. 55's,PowerMax3 adj. , A pillar Boost/EGT,4" turboback exhaust,custom built aluminum airbox W/K&N-RE0860 through the cowl, and more to come...

 

[My 6 Eats V8's Old File]

the thing about doing this is that you can not make more boost than even a single can, your over the map if you do. It doesn't matter how many trurbo you do beside each other the pressure ratio's of both must be what you look at. Both of those turbos can only make up to around 40psi before you start pumping to much heat in the motor, at that point you are acctually putting less air in dew to air densitey of hot air. Hot air does not carry more oxygen, just makes more boost.
would look cool thow. #ad

 

[jkern]

You may not get higher boost numbers, but you should get twice the volume of air flow... or twice the number of oxygen molecules that can be used by the engine!! when you have volume, you don't need as much pressure to get the same about of air in the engine... there is math to back that up somewhere i think! just my humble thoughts


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Jeremy Kern
1999 2500HD 4x4 QC,SB, ISB, 5spd, 3. 54LSD, 33x12. 50 cooper STT's Denver off-road bumper with Ramsey RE12k, PIAA series 520 lights, Rancho RS9000's, heavy ft. springs, JVD Torque Enhancer, DiPricol boost and pyro gauges, and a bunch of other little things! www.geocities.com/phrn30 for pics!

 

[Vaughn MacKenzie]

Probably the biggest hurdles to tackle would be coming up with 2 custom manifolds so you can mount one turbo each to the front and back set of 3 cylinders. Then to plumb exhaust and 2 intakes. The cool thing would be the resulting true dual exhaust. I'm assuming this is what you're talking about, one turbo per 3 cylinders, 100% separate from each other on the exhaust side.

Vaughn

 

[Todd T]

wouldnt you then need a bigger intercooler to handle the increased volume and needed cooling capacity? without, you would just bottleneck the two into a high pressure low volume scenario and defeat the purpose of having two to begin with.

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Todd,
2001 Q-cab SB 4x4 5spd 3. 55's,PowerMax3 adj. , A pillar Boost/EGT,4" turboback exhaust,custom built aluminum airbox W/K&N-RE0860 through the cowl, and more to come...

 

[Diesel Freak]

Volume is exactly what I was thinking about. That is what the ported head is for. Yes, I agree that parallel turbos will not make more boost pressure than a singal turbo, but at 35 psi on both turbos there would be a very free flowing exhaust and head to keep egt down (to a point). If the engine were a closed system (IT IS NOT) parallel turbos would effectively double the flow. At 35 psi I think we yould have about 1. 7 times the air pushing through the engine.
Just a thought.
-Cliff

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2001 ETH-DEE, Diablo Power Puck, Bosch 275's, Practical Solutions Boost Module and Elbow, LFT Silencer Ring Eliminator, K&N, Straight Piped http://www.mudrunner.sites.cc

 

[My 6 Eats V8's Old File]

alright here is a question for you guys
if you have say 40 psi boost, how much air goes through your motor. cfm=cfm depending on temp which has direct effect on air density.
you can not have way more air with out more boost here guys, the only way to get more boost is by staging or by pushing turbos past their map.

 

[pres10]

6 EATS 8
Well said. 40psi is 40psi, no matter how many sources it is comming from. I kind of doubt that 3 cylinders would be enough to spin an HX35. If it is, the only benefit that I see would be less back pressure which may result in cooler EGT, due to more air getting that way. Not a bad idea if it would work ... I just do not think that it would. My 2 cents worth. If I were goin to spend the money for a second turbo, I would stage them.

Has anybody on here tried water injection to cool the air and bring up the density ? That is an idea that I am rolling around. I think that it could be done very cheaply. What about alcohol ... . would be in any way similar to LP ?

John

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2K Auto, 354 gears, VA and BLUE box, 4" exhaust, Auto Meter EGT and 60# Boost Guage, pressure lock,(soon to be replaced by DTT VB and TC) every option but the sliding rear window and snow plow prep. and sport package

 

[Diesel Freak]

Yes, I agree, that is why I brought up porting the head. A dual core intercooler and larger intake ducting would also be a good idea. Pressure is caused by a resistance to flow. Removing some of the resistance will result in lower boost! Therefore lower boost pressure will accomplish the desired result. With two HX-35 turbos the available exhaust flow potential would allow close to 450hp. If the intake side were freed up enough (hogging out the ports and bigger valves) that power level could possibly be reached without cooking the engine.
Yes this would be very expensive and a plumbing nightmare, but what is money for anyway?

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2001 ETH-DEE, Diablo Power Puck, Bosch 275's, Practical Solutions Boost Module and Elbow, LFT Silencer Ring Eliminator, K&N, Straight Piped http://www.mudrunner.sites.cc

[This message has been edited by cdaledh (edited 04-26-2001). ]

 

[KWIKKURT]

Hey ADAM How's life? Broken any parts lately? #ad
Say Hi to Brian for me. .


Now my $0. 02 Pesos... If you ran dual turbos Use smaller ones like a pair of T03 or T04 Garrett (AirResearch) they would be around 70% of the volume each and since they are smaller they would have less mass and diameter in the Turbine and Compressor wheels. This would give you less turbo lag and be easier to plumb the intakes and exhausts. I would think that if you split the exhaust coming out of the 5. 9L That there might be some increased lag driving two HX35's.

Here's an idea for plumbing: The stock manifold is already split at the mounting flange. You can buy heavy steel pipe elbows(3/8" wall more or less) and weld up a 2 turbo mount that would look kind of like a pair of Ram or Bull horns with the tips cut off. Then rotate the turbos until the compressors face each other. Out of aluminum (recycled Duramax heads? #ad
)or light weight steel (muffler Pipe) you can make a "Y" or "T" and then run it to one airfilter. Then run the exhaust from the front turbo down and under the cummins to the other side and back. They rear exhaust would be more or less in the same place as stock.

Pres10,
You must of been typing the same time and same thoughts as me. . I was also going to mention water or methonal injection. . Very easy to install and it worked great on my Turbocharged 292 L6 truck motor with high boost for a gasser and no intercooler.

And don't forget you will need two exhaust brakes. . #ad
and maybe a Parachute.

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"Have you driven OVER a phord lately"
2001 2500 BRT WHT SPORT QUADCAB 4X4 ETH 3. 54LSD TRLR CMPR PKG ALL OPT XCPT LTHR



[This message has been edited by KWIKKURT (edited 04-26-2001). ]

 

[Diesel Freak]

geez this has just turned into a runnung joke. Looks like I need to go back to building my Camaro with a turbocharged 350 with 8. 25:1 compression, EFI and 12 psi of boost... I am hoping for 650 hp. I am also thinking about a 50 hp nitrous system to eliminate turbo lag.

 

[Dr.Evil]

Son & I always wanted to build up an ALL ALUM. 408 CID 351-Windsor Ford, twin turbos running on alcohol, figure about 1600 HP at 24 psi give or take couple psi. We talked about putting it in everything from a Monte Carlo to a Camero. Heck, even if it said OHS KOSH it's still be fast!
DENNY... ... ... ...