AMS Drag car pics - Page 2

FattyBoomBatty · 11-19-2008

Quote:

Originally Posted by 4g63tcrazy

It's sequential, smaller turbo to help spool up the bigger turbo. Which in their case was needed. haha

No, in that setup, the small turbo would not help spool the big one very much at all, it is there mostly just for lower end power. Those big blocks in the exhaust and intake of the big turbo are doors/valves that open up once the big turbo is ready to spool or the small turbo has already spooled. The waste gates vent to atmosphere.

b00stcreep21 · 11-19-2008

^^^ Correcto. I'm curious if the way they had it set up would actually spool the little guy at any decent rate

**JET** · 11-19-2008

Quote:

Originally Posted by FattyBoomBatty

No, in that setup, the small turbo would not help spool the big one very much at all, it is there mostly just for lower end power. Those big blocks in the exhaust and intake of the big turbo are doors/valves that open up once the big turbo is ready to spool or the small turbo has already spooled. The waste gates vent to atmosphere.

If that is the case then tell me why the output of the small turbo is fed directly into the larger turbo. The gate in front of the large turbo must close so that the small turbo can pressurize the large turbo, then once the large turbo spools, the gate in its intake opens so it can suck in more air. I am sure it would take a lot of messing around to get the timing of all those gates right.

**Goat Blower** · 11-19-2008

Fatty might be right for once. The large turbo is fed the full exhaust stream and the smaller turbo is being fed from the exhaust after passing through the hotside of the bigger turbo with a gate just after that. So I'm guessing the gate is closed building pressure in the exhaust and spooling the little turbo which creates a ram air effect into the intake side of larger turbo and once the larger turbo starts making a predetermined amount of boost, the exhaust gate is opened which stops the smaller turbo from making boost and becoming a restriction.

FattyBoomBatty · 11-20-2008

Jet, you kindof answered the question yourself. It goes into the intake of the large one, but to be effective it needs the intake gate closed. It does help the large turbo spool somewhat, I'm sure, but I think it's main purpose is just for boost until the large one is spooling up.

**JET** · 11-20-2008

Quote:

Originally Posted by FattyBoomBatty

Jet, you kindof answered the question yourself. It goes into the intake of the large one, but to be effective it needs the intake gate closed. It does help the large turbo spool somewhat, I'm sure, but I think it's main purpose is just for boost until the large one is spooling up.

I didn't have a question. If the only purpose was to provide low end boost, why would they route the output of the little turbo into the big one and not just bypass it all together? It has to be to spool the big one, otherwise it would be easier to run a staged system.

**Goat Blower** · 11-20-2008

But it's not spooling the bigger one, if it was, it would be directed to the turbine wheel, not the compressor wheel. That's simply forcing more air in, but not really helping spool the turbo.

**JET** · 11-20-2008

Are you saying to aim the compressor outlet of the smaller turbo at the turbine inlet of the larger turbo? It could work the way it is if they are using a smaller turbine wheel on the GT28R to spool it quickly, then switch the valves before it chokes. It all depends on the turbine to compressor ratio's of the turbo.