he351 for twins on 12 valve

So parallel turbo's would be great on a tugboat or a irrigation pump running a steady rpm window. YOur saying compounds for a constantly changing rpm is superior for the 12 valve, or almost any diesel?
Thanks,
Mike
 
high toned sob said:
I never said "factory" turbocharged. Example. 468 bbc callies crank, eagle rods, ross pistons, dart heads. 8.1 compression, marine intake, megasquirt injection. Twin to4b's, homemade headers, went 9 flat in a 2600 lb. monza.
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how do you think it would have run with four T04B's?

Next, a 455 olds, girdled bottom end, 425 steel crank. Eagle rods, Arais pistons, Aluminum Batten heads, blow through Dominator, Harland Sharp, etc. etc. Also twin to4b's, ran a best of 6.32 in the 1/8th mile before I spun a rod bearing. In a 3300lb Olds Cutlass. That's been 10-12 years ago before I had kids. All runs a National Trails and Pacemaker in Ohio.
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again, why only two T04's? why not 4? :confused:

Next, a factory turbocharged 83 thunderbird 2.3 4 banger. Ran steady 13 flat in the quarter in high school.
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ok, I KNOW you didn't have twin turbos on that...

SBC 383 with twins, in a older chevy camaro. Never did get to run it, but probably a 11 sec. very streetable car.
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why not four turbos? :confused:

I'm not entirely retarded, I"M NOT bragging about having done xxxxx in xxxxx. I'm not as knowledgable as most on here , but I know what works on gas engines. I understand this is different (big time), HELP ME OUT here. I would like to try a set of parallels on a cummins, surely you can give me some guidence. If it doesn't work I won't hold it against you if it doesn't:Cheer:

thanks,
Mike
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my point is... your previous builds had turbochargers that were appropriately sized... you're talking about taking a factory turbocharged vehicle and adding another turbo the same size to it and expecting it to run great... just because side-by-side turbos run well on one application doesn't mean they're going to run well on another

again, doubling up on turbos is the exact same thing as running one turbocharger with double the lbs/min on the bottom of the map... so where one HE351 will support 500hp at 40psi, two will support 1000hp... at 40psi... just because you put two of them side by side, it doesn't magicly make them more efficient at higher boost... you need boost to make power on a 12v

an S480 will probably do 1000hp-ish... it's a HUGE turbo... it's MORE efficient at higher boost than an HE351, but still, hang that thing on your 12v and tell me how well it runs below 4000rpm
 
high toned sob said:
So parallel turbo's would be great on a tugboat or a irrigation pump running a steady rpm window. YOur saying compounds for a constantly changing rpm is superior for the 12 valve, or almost any diesel?
Thanks,
Mike
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no, parallel turbos would be great on a V engine for packaging reasons and if it didn't need more than about 30-40psi to make power.

I'm saying the 12v needs high pressure ratios to make power, and the best way to make high pressure ratios is multi-stage compression... you can make great power with a single turbo on a 12v, but it'll need to be a compressor that's semi-efficient in the 50+psi range! you're not going to get that with an HE351, and you're certainly not going to get it by going smaller than an HE351!!!!!
 
YOUNG GUNS15 said:
in my mind two stock turbo's side by side is not worth the build.....just throw a big "S" turbo under it and be done with it.
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Are you talking about a big single "S" series? I don't want much smoke. My kids "have" to have the rear window open when the ride in the backseat. Cab gets stinky quik with the stacks.:hehe:

I wish I could figure out how to post pictures on here. I can write a fuel map for a megasquirted bbc, but I can't post pictures on the internet. Go figure:doh:
My truck is different. Dual tanks, PPG flat black, no gay crossover in the bed for my stacks, etc. I try things, if they don't work, I try something else.
thanks,
mike
 
Forrest Nearing said:
how do you think it would have run with four T04B's?



again, why only two T04's? why not 4? :confused:



ok, I KNOW you didn't have twin turbos on that...



why not four turbos? :confused:



my point is... your previous builds had turbochargers that were appropriately sized... you're talking about taking a factory turbocharged vehicle and adding another turbo the same size to it and expecting it to run great... just because side-by-side turbos run well on one application doesn't mean they're going to run well on another

again, doubling up on turbos is the exact same thing as running one turbocharger with double the lbs/min on the bottom of the map... so where one HE351 will support 500hp at 40psi, two will support 1000hp... at 40psi... just because you put two of them side by side, it doesn't magicly make them more efficient at higher boost... you need boost to make power on a 12v

an S480 will probably do 1000hp-ish... it's a HUGE turbo... it's MORE efficient at higher boost than an HE351, but still, hang that thing on your 12v and tell me how well it runs below 4000rpm
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Why not 4 turbo's? Doesn't make sence to run 4 when two will do the job. Yes I know, I just answered my own question. I'll take your word on the s480. I don't know of anyone running compounds on a gasser. I did not know the 12 valve "had" to have boost to run . I thought volume would work just as well. The turbo coupe was not twins, just single, but I did play with it some. That was a really fun car.
Forrest, since your the most adament that it won't work, tell me this. "IF" you had to do it, which turbo's would you pick, and what would you expect? Remember, I'm only looking for 500-600hp, but kind of "do-anything" power. Cool, clean, and different.
thanks dood,
MIke
 
"volume" will work, but how do you get volume? :confused: you need serious head porting and/or a different camshaft. then you move more oxygen molecules at a given pressure ratio.

you can't just put a giant turbo on something and expect it to work great, it simply does not work like that. again, learn to read a compressor map, and you'll understand why this is what it is...

if I had to build a 12v with twin turbos side by side? I'd have them blowing together as the primary stage in a compound setup... IE, tripple turbos. I would NEVER waste my time with a single stage twin turbo setup on one of these engines... ever...
 
Got Smoke? said:
LOL I had to Forrest! Hell, he's already said something about ditching it 2 or 3 times in this thread!
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I never said anything about ditching it. I said if my idea won't work then I'll use it in compounds with the HT3b.
So Forrest, "even" if I ran a centrifigul for low boost (1-16lbs) and had a bypass on it, the twin 351's would still be not as good as a plain ol compound setup? Such as the 351/ht3b like Stevewes2004 is using?
thanks,
mike
 
Why try to re-engineer a setup that has already been proven? A compounding twin setup is something that is proven to work on these trucks, especially a 12v that needs extra pressure to get the air needed. The only thing you could do IMO is use a VGT turbo/s.
 
no, it wouldn't... it would be far too complex and heavy and expensive... nothing wrong with trying to reinvent the wheel, but when you're trying to make the wheel square shaped? you're doing it wrong
 
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