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Me like track days
 
Craig 930 RS's Avatar
 
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No doubt, Brian. I'd love to see one built.
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Old 01-17-2008, 08:20 AM
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Quote:
Originally Posted by RarlyL8 View Post
With enough patients and the right components you can get a CIS engine to produce boost at 1800rpm with 1.0bar all in by 2600rpm. That translates to unpreceptible lag and instant throttle response at 2000rpm. I don't know what twins can do for you that is better than that but I do plan to find out. Triples? I can't imagine that would be of any significant advantage worth the plumbing nightmare.
Brian, I know where you are going here by stating your goals in Turbo Porsche Owner speak but in reality you're after an exhaust back pressure reduction in the lower RPM range. Monitoring exhaust pressure on the turbo will get you there sooner. Without this reduction you will only change the bias toward the bottom end netting a choked off power curve.
I didn't include CIS in this discussion. An engine targeted at 600HP fed by triples would by necessity need to drop Porsche's CIS system.

Last edited by copbait73; 01-17-2008 at 12:27 PM..
Old 01-17-2008, 08:48 AM
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Crotchety Old Bastard
 
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Just for clarification, the description I laid out for the responsive CIS engine is not theory. It is fact and it has been done. That engine put down 400WHP and achieved 23mpg @80mph.

I'm no turbo expert, you've got that one covered Marty. The concentration to achieve that goal was complementary components and massive tuning efforts. One of the tools used was monitoring engine vacuum.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
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Old 01-17-2008, 01:13 PM
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I want to do sequential on my car at some point. I believe the ultimate street setup would have sequential setup
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Old 01-17-2008, 01:32 PM
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Doubtful on an aircooled Porsche engine.
TIme has proven that twins are the best solution.
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"930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe
Movie: 930 on the dyno
Old 01-17-2008, 01:39 PM
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Congratulations on your development and manifold vacuum observation shows acceptance of the fact the engine needs to first function in a free flowing naturally aspirated state (despite the turbo) before it can be expected to produce under boost. My point was more for those other guys who think that BOOST is power.

Where did you run 80 MPH for an extended time? My many trips to AL showed me 75MPH was OK with the Staters but 80 will get you a ticket. Did you have a blocker up ahead?

Last edited by copbait73; 01-17-2008 at 06:16 PM..
Old 01-17-2008, 01:43 PM
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Quote:
Originally Posted by 930gt-40r View Post
I want to do sequential on my car at some point. I believe the ultimate street setup would have sequential setup
Parallel twins is the best configuration for our engine configurations. Much simpler plumbing too. Bolt on a pair of nice hybrid turbo's and away you go
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Old 01-17-2008, 03:20 PM
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Quote:
Originally Posted by WydRyd View Post
Parallel twins is the best configuration for our engine configurations. Much simpler plumbing too. Bolt on a pair of nice hybrid turbo's and away you go
I have to agree twins make more sense, twin VNT even better. Porsche demo'd two driveline technologies on the 959. Sequential turbos - abandoned, and complex AWD - abandoned. The 959 is a great collector car but somewhat of a flop as a pedictor of things to come. Like many of the GM show cars...well, we did get the large fins for a while.

Sequential or series sequential are better for diesels than on wide speed range sporty car motors.
Old 01-17-2008, 04:47 PM
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Crotchety Old Bastard
 
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Where did you run 80 MPH for an extended time? My many trips to AL showed me 75MPH was OK with the Staters but 80 will get you a ticket? Did you have a blocker up ahead?

Hehe, no Marty, runs over to the Smokey Mountains are usually 80mph. That was the "sweet spot" for that engine with that gearing. Never got out of vacuum running at a steady 2800rpm but boost was a flick of the toe away.
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Old 01-17-2008, 06:03 PM
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Quote:
Originally Posted by Craig 930 RS View Post
Yeah, I was curious about 2 turbos on a CIS engine - more out of sheer curiosity than any practical
"might do it" kind of thing.
I thought this was an...uummm....eeerrr...aaahhh...interesting setup. Creative...maybe? This doesn't appear to be CIS, but what I found interesting is that intake boot over both turbos. I wonder if something like this could be employed using CIS? I dunno, I need to ingest more drugs, possibly!

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Old 01-18-2008, 05:57 AM
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dont you mean inter-what the-esting?
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Old 01-18-2008, 12:18 PM
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Why bother with CIS when you start making real power. You are just asking for problems.
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Old 01-18-2008, 05:04 PM
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Quote:
Originally Posted by sand_man View Post
I thought this was an...uummm....eeerrr...aaahhh...interesting setup. Creative...maybe? This doesn't appear to be CIS, but what I found interesting is that intake boot over both turbos. I wonder if something like this could be employed using CIS? I dunno, I need to ingest more drugs, possibly!

This is a LoTec turbo conversion for the 993's back in the middle 90's, did not like the way the intake were siamesed, it did use the stock headers, etc., it was a good set up, not great by any means.
Old 01-18-2008, 06:33 PM
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