Contour Enthusiasts Group Archives Forums Modifications Duratec Performance Turbo thoughts

Originally posted by DemonSVT:

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Originally posted by Chris Hightower:

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Originally posted by Sandman333:
[b] Chris's kit is going to run at what, 5.5 PSI?

We ran at 5.5PSI during a test run. The kit is going to be around 8-9PSI estimated.

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Originally posted by DemonSVT:
Also I predict the boost level to be around 8-9psi

For my next trick I'll predict HP & TQ

300-310 & 260-275 (245FWHP/245FWTQ)

That could raise +12-15HP/TQ based on final boost level chosen. (I.E 9-10psi)[/b]

Originally posted by mmarfan:
Shouldn't the intercooler push more power - somewhere in the area of 340hp?

Originally posted by Sandman333:
Will there be an option for non-SVT owners to turn up the boost a little, given our lower compression ratios?

Originally posted by DemonSVT:
Something to think about is that a non-SVT will not breathe as well as a modified SVT and actually will produce a little more boost pressure while still supplying the same cfm as the more efficient SVT engine.

this isnt making much sense. are you saying that a higher flowing head, such as the better flowing SVT version, would produce less because it breathes better?

boost is dependent on exhaust flow. better yet, it is dependent on heated exhaust flow. the heat makes the exhaust gases expand more forcefully and therefore spins the exhaust turbine and turns the turbo.

boost pressure is limited by the preset level of the wastegate. a gillis valve or a simple $5 bleeder valve can be used to fool the wastegte into seeing a lower boost level than is actually present.

cfm of a turbo is not related to the engine flow. it is dependent on the turbo itself.

Yes. I expect the non-SVT to make a little more boost if cfm where the limiting factor. The difference would be small though; 1 possibly 2psi more.

first of all, what CFM are you talking about? turbo? head? exhaust? there are so any dfferent areas of the engine in relation to the turbocharger that deal with cfm, you need to clarify what youre speaking of.

what would cause a lesser-flowing system to produce extra boost?

However the wastegate is the limiting factor. Unless you used 2 different settings in each kit, it would limit the boost level.

correct. a simple $40 gillis valve can give you the ability to set your boost level wherever you woud like.

The turbo, on an SVT engine, set at 9psi will flow more CFM then a non-SVT engine at 9psi. More cfm (properly mixed) = more power output (efficiency)

no. that is not true. the same turbo will flow the same amout of pressurized air when spooled to a certain PSI, regardless. this is why you use a T3 on a 2.3L four banger and a T-76 on a 5.8L V8:

the smaller turbcharger will not produce the nescessary amount of incoming air to feed the engine. turning up the boost is a waty to defeat this but: overspooling a turbo is actually BAD, as heating up the charge air leads to *gasp* detonation.

Any thoughts on different boost level kits (SVT/Non-SVT) Chris???

why? the kit will be built entirely dependendent on how much power the bottom end can handle without leaning out the air/fuel mixture. if a SVT engie can handle 300 wheel hp and maintain 12:1 A/F then so be it.

Originally posted by Rara:
DonSVO, you don't quite understand the way boost vs. flow works.

flow, yes, but flow of what? a cylinder head? an intake tract? the vagueness of his reply is what i am getting.

I can go into more detail if you like.