Turbo Slant Setup
Has anyone had any experience with the TD04LR off of the 2.4 SRT-4? Any thoughts on that as opposed to the Garrett? Does anyone know the model of Turbo that is on the 3.8 Buick GN?
Like I pointed out in a previous note, I am ANYTHING BUT an expert when it comes to turbos and their proper sizing/application, but look at this:
The SRT-4 turbo you are considering, is coming off a 2.4-liter engine that has a cubic inch displacement of only (2.4 X 61) 146 cubic inches.
It's an air pump.
You want to install it on a 225 cubic inch slant 6... another air pump... (3.7-liters,) which seems like more that a little mis-match in the amount of air it will be asked to provide for the 6. That's a FIFTY-FOUR percent difference in the amount of displacemt you're going to ask this turbo to feed.
However, there are other considerations which make this installation not as bad as it would seem at first blush. The SRT-4 cylinder head/cam setup is a highly-efficient mover of air, with 4 valves per cylinder; a totally-different breathing situation from a slant 6 which has ports and valves that are far too small for 225 cubic inches.
So, it might not be as much of a mis-match as it appears, on the surface.
In a worst case scenario with this 4-cyl. turbo on a slant 6, you MIGHT encounter a situation wherein the engine outstrips the turbo's ability to deliver air in sufficient quantities, with the result that the engine runs out of breath at an rpm that is too low for your expectations (like, maybe, 4,000 rpm.) Another caveat would be the possibility of over-speeding the exhaust impeller when that 225 tries to shove TOO MUCH hot air through a (maybe) too-small turbo.
I don't know if that's correct... somebody with REAL, hands-on experience, please correct me if I'm wrong.
I don't know what the correct nomenclature is for the 3.8-liter Buick (Grand National, or T-Type) turbo, but I do know that they have been used on slant 6's to good advantage. Tom Wolfe put one on a nearly stock 225 in his Dart and went 12.95 at 104mph.
Here's the video:
[ame="http://www.youtube.com/watch?v=pPe_vHwZsF4"]Slant Six Turbo 1970 Dodge Dart 1/4 Mile pass - YouTube[/ame]
I think that turbos and slant 6's work very well together. You don't need 35 pounds of boost to go amazingly fast...
