got a idea to pass by everyone. tell me why it wouldn't work.

i had a t76 on my 408 and it spooled instantly. steped up to the pt88 and it had significant lag. my next step will be someting in the twin t72 range. i expect that to be more laggy than the pt88. i could go with a trans brake or maybe a 2 step(not sure if that works on an auto) but i dont want a race car. i want a quick spooling set up for everyday driving. so... my idea i think would give quick spool when you punch it with the full potential of the t72's up top.

2 log headers conected to the turbos, out the back of the logs have a 2.5" cross over tube that conects one log to the other. put the waste gate on that cross over.

out the exhaust side of each turbo have a 3" down pipe. have a block off on one of the down pipes. it could be a high quality cut out style block off or maybe a pair of 50mm waste gates. then on the intake tract you would have the turbo on that side of the motor have a one way flaper valve that would block air if it tried to feed back into the turbo from the other turbo and once the presure was up high enough it would let the air from both turbos into the motor.

the idea is when the truck is under lets say 10psi no exhaust would flow thru the one turbo. because the down pipe is blocked off all of the exhaust would be forced into the one turbo. it would spool fast. once it was up to a preset psi the block off in the down pipe would open and the 2nd turbo would spool up. it should spool up real fast since the motor is all up to speed and making 600+hp allready. the intake tube on that one turbo would need to have a one way flapper on it so when it wasn't pumping the air from the other turbo wouldn't push it's way out thru that turbo.

you could have the block off gate open fast(waste gates) or open slow(like the sliding gate). you could also not have it close 100% so it would be pre spooled a little.

check out my crude drawing, my woman says it looks like a *****.

 

lol you drew a ****.

 

A 150 shot of nitrous would be so much easier about 1.2 seconds worth at the hit of the throttle Very common in the big single supra setups.

 

the nitrous is great for drag racing and i do that now. really it doesn't seem very complicated to me. just a flaper valve and some kind of block off plate. my question is will it spool faster and still have the same top end potential.

 

It may work...you won't know unless you try it. Most of the diesel guys and truck pullers use compounding of the turbos. That may be another option for you.

 

the compound turbos(in series) are used to get really high boost. the t72 will push 40psi prety easy. i wont need any more presure than that but i will need a lot of flow so that is where the twins(in parallel) come in.

 

do it....do it...

 

sounds like an awesome plan...I'm curious to see if it would really work...Eh F*ck it...just try and if it doesn't then you only have to change a little here and there...the plan sounds pretty solid though but imagine tuning that thing...hahahaha

 

in a vahgina

 

take a look into mazda rx7 they did that i believe in the 3rd gens may give you some ideas!

 

i dont think tuning would be much diferent than normal. just fill in the ve map.

 

the supras did it too. i am not sure but i think their sequential set up is more complicated than my idea but i dont know that for sure.

 

i had this same idea. seen a twin camaro already thow had the same setup too couldnt even see the turbos but yeah ****** fast.

 

This thought has crossed my mind quite a few times.. I dont see why it wouldnt work. How exactly does it work in the Supras or the RX7s?

Do you have any experience with the sequential setups in those two cars?

 

i have no idea how those cars are set up but i would like to know if anyone has a drawing or link. i am guessing they have more parts. aren't the turbos diferent sized too? i know the over all output of the 2 turbos isn't very high either.

unless i am missing something i think my idea would be really fast spooling AND capable of 1400+rwhp

 

Wouldnt that create a pressure imbalance?

 

here's something on an RX7.... I think it would work on a camaro.

http://www.carforums.net/showthread.php?t=26483

uh here's something on a supra...

http://www.max-boost.co.uk/max-boost/supra/turbo.htm

 

@

 

Why not run a divided housing with an individual exhaust feed to each scroll. Run a large waste gate off the one side and have it start opening at 7psi or so to allow more exhaust flow. It provides very fast spool with about the same flow capacity on the top end.

 

Dual Ball Bearing turbo...you would see a big difference in spool time > 15-20%. Keep it simple.