Honda16hb

Here's the plan: 14b or t25 attached to the exhaus manifold, dp and wg pipe into a t4.

Here are the problems: space is going to be as hard to get as the chick in my avatar, the 14b is going to be restrictive as heck (yes, I said heck) going into the t4.

here are my proposed solutions: do my best with space, get a different radiator for sure. maybe just have a huge solenoid that is either always open or always closed for the small turbo wg, that way when I get to the boost I want out of the little one the big one will be ready and I can just dump all exhaust gas into it.

the car: 88 civic hatch dx red (for speed)
the motor: B18A bottom end, built with forged rods and pistons and posted sleeves; B16A top end.

any input? so far I've been told by one person that this will not work (they put it in nice terms though), and I've talked to 2 people that said it was going to be a challenge.

Reddy

Dear god it will NEVER work. Sequential is IMPOSSIBLE to get it to function correctly. simply impossible. Also you can't connect a turbo to a downpipe.

Honda16hb

why no turbo to dp action? the pipe coming out of the small turbo will only be 6 inches to a foot, not really a dp. I know I'll probabably have to support the big turbo, I'll just put a brace on the block.

stretch-d

Hey kyle...

You'll also have to run your charge piping through both turbos..

I have no experience on this but, It seems like the t4 will just take over when the exhaust pressure reaches a high enough level.

Restriction from the smaller turbo does seem like it would create a problem.

Can't you play around with two turbos that are more closely related in size? May be that have different trims or rotor sizes to get the different boost threshold.

Edit: After reading what whitey wrote, you may not be able to get enough flow to make the primary turbo spool.

Reddy

How do you think the flow is going to be? Trust me I thought of a sequential twin and the best way would be to build a custom manifold with multiple wastegates to change the exhaust flow from one turbo to the other. The vaccum system is complicated as hell to get it to function correctly. You'll also need valves in the charge pipes to prevent the massive pressure loss through the non spooling turbo

stretch-d

I trust you Whitey....It's a head scratcher for sure.

How do the factory sequential systems work?

Honda16hb

they work like that: http://homepage.ntlworld.com/peter.b...ips/turbos.htm

I didn't even finish reading that, I got bored. ya, I'll have to have butterfly valves in the 2 seperate charge pipes before they come together. Or what they do on semi trucks is they just put one charge pipe into the intake of the second turbo and double compress the air or something like that.

Reddy

They use a series of multiple valves and ---- with miles upon miles of vaccum lines. The RX-7's had problems with their sequential setup that they run so much better when you rip them off. The theory of it is a good one, it would take alot of research and money to get it to run right.

stretch-d

Kyle, you don't need sequential turbos to impress the girl in your avitar.

One BIG one will do fine I'm sure.

Honda16hb

alright, I just read that article, it was shorter than I thought. I'm going to have to have a few valves to prevent gas reversion. It talked about a one way reid valve in the charge pipes, I need to figure out how to make one, it sounds like a good idea.