20psi at 2800 rpm's. 800rwhp. Compound turbos!
- Thread starter tekdeus
- Start date
You can only flow XX through a small turbo before it chokes, only way around this is by using bypass valves.
Interesting concept but very complex to get a wide powerband.
I ran a 3040r with a .63 hotside way back and it had almost 0 lag but did flatline by 5500 on the 7M.
Interesting concept but very complex to get a wide powerband.
I ran a 3040r with a .63 hotside way back and it had almost 0 lag but did flatline by 5500 on the 7M.
this has bena around for year's mostly deisles thou but they did try some gas stuff as well
borgwaraner were the frist to start componding turbos
there used to be neat wright up about them on ther web site
only down fall is rpm/heat and lack of room for a dd
borgwaraner were the frist to start componding turbos
there used to be neat wright up about them on ther web site
only down fall is rpm/heat and lack of room for a dd
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Its about time someone does this on a supra! My buddy has a compound set up on his tacoma a gt30 and a gt45, hes using the stock 3rz (2.7L) too. before he turned the boost down for daily driving he was seeing 30psi at around 3200-3400rpms!
grimreaper;1252256 said:
Same here. I'd also like to see how they're set up. I have an image in my mind of how I imagine it would look, but my image is too bizarre.
I came.
I was thinking of using a positive displacement blower with a 42R if I ever got bored with a 35R. This method is probably more efficient as far as heat goes for usage of more than just 1/4 mi, since you'd probably have to use an air-to-water intercooler for fitment and heat reasons anyways for twincharging.
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gnarkill87;1252015 said:
just because you compound the turbos does not mean they become more efficent.
A gt35r on a 2.7L car. I doubt that he acheived even 15 psi by that RPM.
Again,
physics is infallible. That means that this setup does not throw physics out the door and make it work better.
ENTROPY.
Learn it. Accept it.
Why compound turbos though when you could kick out 1 of the turbos and use a supercharger!
1 supercharger induces torque & power in the lower rpms then turns off via a magnet clutch like the ones on an A/C pully.
Then have only the large turbo run when the rpms or load is at a certain stage where the supercharger would choke!
No surprise there twin charging have been around also for a while also and they get better results with a little bit less plumbing because the supercharger doesnt run off exhaust plumbing figure that out.
1 supercharger induces torque & power in the lower rpms then turns off via a magnet clutch like the ones on an A/C pully.
Then have only the large turbo run when the rpms or load is at a certain stage where the supercharger would choke!
No surprise there twin charging have been around also for a while also and they get better results with a little bit less plumbing because the supercharger doesnt run off exhaust plumbing figure that out.
Cooling the pressurized air is a pain on a supercharger setup, and turbos are MUCH more efficient...
Evilempire1.3JZ-GTE;1252457 said:
Plumbing might be easier, but its still a system thats twice as complex..maybe even more so if you go A2W like I mentioned. I think you'll lose some top end through the blower as well. You'll be changing more parts too.
gnarkill87;1252402 said:
nice try but nope.
The math just does not add up.
So either you misred, he misread. Or someone is fibbing.
Using the compressor map of the GT35r (which is publicly available through Honeywell/Garrett). With some quick math. Assuming a 100% VE throughout the engines RPM for that 2.7L engine (which in this planet and reality, no turbo engine even comes close to 100% VE).
The GT35r BARELY comes out of surge at 3500 RPM at about 65% efficency flowing a mere 23.96 lbs/min. The bad part is that it WILL be teetering on the surge line on that tiny an engine.
So care to try again or should I continue to trump your ancedotal "evidence" with math and physics?
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Wow that looks so cool! Like spaghetti. It reminds me of the tri-turbo mk4 from back in the day; all the piping like a mating ball of garter snakes :icon_razz
eric
eric
I recently got my CDL. While at school I went into the shop and was talking to some of the techs. Looking at the CAT and Pet turbo setups. The CATs always use a twin charge turbo setup. Those are some big snails and they only peak out at around 2000-2500, even tho youll never rev it that high. They push 40-80# of boost. But then again cylinder size and amount of gasses produced per pulse is way higher.
back home there was a guy with a Ford F-150, he had it twin turbo'd and he was pushing 100 Pounds of Boost!!! It was absolutly nasty. I got to watch him run down the track and it spun the whole way..lol
