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Posted: Nov 17, 2005 9:59 AM
by bahnstormer
mention numerous times that you can only keep a turbo'd car floored for 15 seconds.....
i realize his first rationalization that u'd be going quite fast after 15 seconds but if you're
on a track's straight i can see my lil' 6psi system being floored for more than 15 seconds....
any thoughts?
Posted: Nov 17, 2005 6:42 PM
by Andy335Touring
Heat build up in the engine rings a bell, i might be wrong though ?
Posted: Nov 18, 2005 12:16 AM
by Matt
The enemy of the turbo system is heat soak. When you're running WOT under full boost you're creating a ton of heat, and you're creating it faster than you can get rid of it.
Appropriately sized intercooler, oil cooler, radiator, etc can help with this.
And also, as you point out, with a big-power car you dont get to stay at WOT _that_ long.
I've read (in the same book) that Turbo road race cars typically have A/A systems so there is no residual heat soak, as you'd potentially get with a air/water IC. OTOH, TCD says that when he took his S2 a/W IC'd car to the track it ran great with no soak at all... so that's very encouraging.
I think if you build a good, over-engineered turbo system (like a TCD S2, from what i can tell), you wont have any problems in any sort of amateur level driving. You can take the guess work out of all of this by putting a temperature sender in your intake air charge and then drive the snot out of the car and see what happens. That will help you decide what you need intercooling wise.
Posted: Nov 18, 2005 10:06 AM
by T_C_D
Corky's book was written at least ten years ago when engine controls for after market turbo systems was very limited. Systems ran low boost with limited igniton/fuel controls. For this reason his statement was a word of caution.
Todd
[Edit by TCD on [TIME]1132326883[/TIME]]
Posted: Nov 22, 2005 2:39 AM
by russc
right, at least most of the info in it is from 10+ years ago.
RussC
[QUOTE="TCD"]Corky's book was written at least ten years ago when engine controls for after market turbo systems was very limited. Systems ran low boost with limited igniton/fuel controls. For this reason his statement was a word of caution.
Todd
[Edit by TCD on [TIME]1132326883[/TIME]][/QUOTE]
Posted: Nov 24, 2005 2:59 AM
by bmwfan2304
i was wondering about this too... like if a turbo'd e28 could run with cars like ferrari's and such in an endurance race... with speeds around 130-160 over a sustained amount of time... i didn't know how much boost a car is under after it gets up to speed though... if it's not at WOT