jyoon

seal the battery compartment and use it as an airbox. it can draw cool air from the cabin. clean off the batter and leave it in there.

chris0626

While that rear shot IS seductive, not a smart move to have the blades exposed. Piping (first set of pics) looks very very well done, however, a wastegate open to atmosphere sounds like a severe exhaust leak (which it essentially is).

I am less concerned about sucking up water (how many of you drive through water that damn deep anyway? rain is not an issue) than I am with turbo lag. Unless the turbo wheels are severely mis-matched (too small of an inducer with too large an exducer... horribly innefficient) there is just no way this turbo will produce the results that a well-matched, manifold-mounted turbo (or turbo's) will.

Shane

Who cares if there is some lag in the turbo? We have 5.0 liters of displacement!!! 316CHP NA plenty of get up and go off idle, so a little lag could be a good thing, in that you have time to point the ICBM in a straight line before the turbo kicks in.

BC

When I was holding onto the a pillar in Tim Murphy's Stage 1 kit car, trying to focus on upcomming road, I was not really thinking about lag (well, maybe Lag, but not lag)

IcemanG17

Lets see some dyno results!!!!!!!!!!!!!!!!!!!!!! It has to run (with an airfilter in dry conditions only)...most dyno's are inside.....
Still waiting
Brian

FlyingDog

Is that the one that burned the bumper cover or is that the one that they cracked the bumper cover to remove or both? Yes, it does look much nicer now.

DFWX

It is a pretty setup and reminds of the P47 Thunderbolts with rear mounted turbo. However, they did not shift gears.
Those LONG LONG pipes would seem to make for severe turbo lag problems and I wonder why they went to the rear? There IS room up front easily for a single turbo and twin turbos are not an impossibility.
I would also think they would want to put their dump valve up by the motor, not in the back, to offset somewhat the lag (and overboost) problems.
But it does look neat - for anyone who crawls under cars anyway.
I suppose it does allow more room for water/air intercooling - but that adds another complication in relation to the long, long pipes. There also would see to be more thermal inefficiency (lost heat) with those long pipes.
Would seem more suited for Bonneville runs than a race track.
Everyone is a critic, no?
Cool set up.
Thanks for the picts!!
Mark

DFWX

PS...
I like the sound of the wastegate opening up when reaching higher rpms - while at the same time really feeling the boost kick in... starts to sound a bit like a rocket motor kicking in.
A 928 at higher rpm is a wonderful musical instrument and wastegate and blowoff valves add to this greatly. Such 928 s should be "played at high volume, preferably in a residential area."

G Man

I really like the idea of the rear mount turbo. I e-mailed squires turbo systems to find out prices for just the turbo, wastegate, and oiling system. I wanted to fabricate my own plumbing for the exhaust and charge pipes. They replied with a price of 3K. Seems pretty steep for just a few parts. I have priced out turbo units and they are no where near what these guys are asking. What gives?

m21sniper

"I am less concerned about sucking up water...than I am with turbo lag. Unless the turbo wheels are severely mis-matched (too small of an inducer with too large an exducer... horribly innefficient) there is just no way this turbo will produce the results that a well-matched, manifold-mounted turbo (or turbo's) will."

Completely agreed.

Still a very cool setup though.

"Those LONG LONG pipes would seem to make for severe turbo lag problems and I wonder why they went to the rear? There IS room up front easily for a single turbo and twin turbos are not an impossibility."

Turbos really drive up underhood(and by default air charge) temperatures.

m21sniper

"I would also think they would want to put their dump valve up by the motor, not in the back, to offset somewhat the lag (and overboost) problems."

What you see in the pic is a wastegate. You're thinking of a BOV(Blow Off Valve).

Two totally different animals bro.

The wastegate as pictured is in the preferred location.

tammons

Lag city. That turbo belongs up where the cat used to be. That would be a much better location. The closer to the engine the better.

Also a while back I was warned against using an electric scavenge pump for a street car. Not reliable enough. It seems like I talked to one guy that ran one that could never find one that would last over a year. Also that should really have a catch can at the bottom of the turbo to catch the oil then pumped out of that instead of that spaghetti junction of brass plumbing fittings.

It is different though and interesting. It will be loud for sure. I ran my turbo 928 without a muff for about 10 minutes and it was a loud ******.

SilverSFR

Tammons,

Motec makes an electric scaveange pump that should last longer than 1 year. I will report back when my new one fails.

SilverSFR

tammons

Yes, that would be good to know. How much $

SharkSkin

Not everyone wants to clear out the engine bay enough for all the plumbing required for a front turbo. When you live in an area with regular smog inspections, the simpler the system is to remove/install every two years, the better. I too am interested to see what is said of lag on this car. I doubt it would be an issue on the track, once you have it all spooled up. But until I'm ready to have a track car in addition to a daily driver, I'm going to be concerned about low end and real-world driveability. I saw some dyno charts on the STS site that implied a >30% drop in power below 3000 RPM IIRC.