HX35 annoying air leaks - Page 2 - Dodge Cummins Diesel Forum
94-98 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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post #13 of 32 (permalink) Old 08-23-2006, 02:03 PM Thread Starter
 
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It's tough comparing Holset's exhaust sizing with Garretts. The A/R compared to a critical area square sometimes is apples and oranges. Even though The Holset I have on top uses a 12cm2, the porting I have done to the critical area just might make it more like a 14 or 16 or even bigger. I know I can get the 1.01 A/R turbine for the GT4288, but compared to about a .80 conversion for the Holset, I worry it will be laggy. And you know as well as I do that when you're fabbing your own stuff, redoing things gets time consuming if you guess wrong!! I do know this....the 64/88 .72 compressor I REALLY like. It's just if I can get below a 1.01 housing. I'll know in a day or two when Garrett gets back with me. He was thinking the 1.01 might be the smallest, which I still think might be big for a secondary.

Chris

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post #14 of 32 (permalink) Old 08-23-2006, 02:25 PM
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I'm with you...that 1.01 might be a bit big for a secondary. A buddy of mine is running a 68mm (Precision) Garrett with a .81 housing and it's REALLY laggy, but that 68mm wheel is HUGE, and very aggressive!

I would shoot for a .80 or so housing from Garret, or maybe look into having something made to fit. Maybe call Precision Turbo or Forced Induction and see if they could help you??

Chris

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post #15 of 32 (permalink) Old 08-23-2006, 02:32 PM Thread Starter
 
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Thanks for the input Chris. .80 was what I was thinking as well. I might go to a few more extremes on this turbo becasue of the potential it has with the very aggressive compressor. The exhaust wheel is an 84 trim (68/82) and I've also requested of garrett to see if another wheel would open up some possibles for housings as well. I'm checking to see if a housing off of a 40 or 37 could be machined to fit this sucker too. Glad to see someone else on board playing with the GT's. Let's definitely keep comparing notes eh?

'Slope...be sure and let me know of any "new" developments from your end as well.

Chris

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post #16 of 32 (permalink) Old 08-27-2006, 01:46 AM Thread Starter
 
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here's an update on the GT4288. I've decided to use the 1.22 A/R exhaust housing....but with a twist. I'm gonna modify the housing so that only one volute of the scroll (the forward one) sees exhaust initially. I'll do this with a butterfly built into an adapter block between the manifold and turbo inlet controlled by a wastegate actuator that will block the rear volute under low boost. Just tune the actuator with boost to keep drive pressures where I want them and keep the GT spooled, yet have lots of flow potential...kind of a built in wastegate. I'll keep you all posted on the progress.

Chris
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post #17 of 32 (permalink) Old 08-27-2006, 02:12 AM
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If no pics how about a drawing
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post #18 of 32 (permalink) Old 08-27-2006, 02:51 PM
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Quote:
Originally Posted by got...DIESEL?
here's an update on the GT4288. I've decided to use the 1.22 A/R exhaust housing....but with a twist. I'm gonna modify the housing so that only one volute of the scroll (the forward one) sees exhaust initially. I'll do this with a butterfly built into an adapter block between the manifold and turbo inlet controlled by a wastegate actuator that will block the rear volute under low boost. Just tune the actuator with boost to keep drive pressures where I want them and keep the GT spooled, yet have lots of flow potential...kind of a built in wastegate. I'll keep you all posted on the progress.

Chris
Do you work for ATS???
Actually, that should work SWEET if you can get it dialed in and working right...but I'm sure you will

I'll definately be keeping an eye on this one now
Chris

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post #19 of 32 (permalink) Old 08-27-2006, 03:44 PM Thread Starter
 
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ah yeah, didn't even make the connection!! I forgot ATS was R&D'ing a "multi-staged turbine". Well that solves half of the equation, if they are doing it it must be worth pursuing. Mine will be a little different design though. It'll be pretty straight forward. Just gonna be a matter of matching the actuator leverage ratio to the opening curve that doesn't make any drastic changes in turbine trim too soon. Then getting the actuator signal right. I think I'll make the bellcrank for the butterfly adjustable as far as the ratio is concerned, this will prolly aid in tuning for a final apply ratio.

Chris
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post #20 of 32 (permalink) Old 08-27-2006, 04:03 PM
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If it works, I might be looking into something like that later on...but for now, I need to talk to Garrett about those BB chargers

Chris

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post #21 of 32 (permalink) Old 08-27-2006, 05:36 PM
 
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controlled by a wastegate actuator
Chris
Are you sayin you want that spare waste gate I have? Oh wait that's right I forgot the gt4288 isn't wastegated so you'd use the big head for the experiment?

Last edited by northslope; 08-27-2006 at 05:38 PM.
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post #22 of 32 (permalink) Old 08-27-2006, 07:31 PM Thread Starter
 
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YUP! I'll keep you in the loop.
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post #23 of 32 (permalink) Old 09-01-2006, 11:44 PM
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post #24 of 32 (permalink) Old 09-02-2006, 08:28 PM Thread Starter
 
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Not yet, still trying to decide whether I'm gonna fab up a variable turbine with the 1.22 on the 42, or keep trying to source a smaller housing.
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