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Right now I'm only acquiring a baseline for other people to be aware of the turbo potential of a stock fire engine. This page is for modified engines only try at your own risk!!!! (Through out this site I refer to the sweet spot as the point in the engines build that produces the most power for the money reliably, hp are crank unless indicated by the whp denotation, which would mean at the wheels)

For the 999cc fire carb the sweet spot is at 100hp, depending on the actual build. With this power level it should be a 13sec 1/4mile car and comparable to the stock or lightly modified Uno Turbo.

For the 999cc fire MPI the sweet spot is at 140hp.

The stock head will not flow past 180hp (in my experience at least)

HP is raised by 1 for every 10C of temperature drop.

For more power

Twin Turbos

Single vs. Twin:
Reliability/Maintenance - SINGLE, less parts.
Value - SINGLE, less parts.
Torque - SINGLE . (twin has demonstrated a broader torque curve in various comparisons so this may be wrong)
Lag Elimination - TWIN, spool faster.
Exhaust Advantage - TWIN, more equal lengths.
Exhaust Advantage On Big Cube Turbo Motor - TWIN (maybe?) is a single 4" downpipe enough for the flow of a 400+ci boosted motor? Wouldn't you benefit from dual 3"(or larger) exhaust + x-pipe over a single 4" exhaust? Also better ground clearance for those non-oval tubed exhaust cars running 4" downpipes.
A4 - SINGLE (maybe?) can make up for lag with converter aided launch.
M6 - TWIN (maybe?) turbos can make up for lack of launch (compared to converter-auto launch).
Streetability - BOTH, but single big turbo may produce too much lag
Power Potential - TWIN, Single becomes too large for the exhaust flow required. They will both have similar hp potential but a single turbo will have a lot of lag to produce the same power as the twins.

Sequential twin turbos

Sequential superturbocharge

This is my intended setup, I'll run a supercharger for low boost and a turbo for high boost. Like this:

I could achieve my target using just one or the other but this way I'll have boost down low for take-off torque and up high for top speed. To achieve 200hp I will need to run a combined pressure of 0.8bar of boost and be moving 8.38 kg of air per minute. This would need to be done on stock compression ratio (I really doubt the engine will hold together for more then a few minutes), the other option is to run 1.6bar of boost on low compression pistons.

My goal is to push a 999cc Fire engine to 200hp and still be streetable, with this goal I should be able to make a Panda into a sub 10sec 1/4 mile car.(My engine already peaked 210hp once when my wastegate disconnected accidentally.) I may just cheat and start off with a 1242cc 8V, it's not like anyone will look at the block to see the stamped 1.2 .

It's all packaging. IMHO, unless you're making close to 200HP per liter it's not a Serious turbo car. I'm not there yet, but then again no one is on this engine.

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