GTS engine power
08-22-2005, 11:23 AM
#1
Cruisin'
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GTS engine power
Just put my newly built GTS automatic up on the dyno. Or rather, it was the Swedish supposedly very accurate Rototest system. The engine is standard GTS, but with mildly ported heads. What I got was 302 rwhp and 425 NM.
Does anyone have an accurate idea as to how much that would translate into at the flywheel?
Does anyone have an accurate idea as to how much that would translate into at the flywheel?
08-22-2005, 11:32 AM
#2
Three Wheelin'
Standard measurement for drivetrain loss is 15% for manual, 20% for autobox. I have heard or read that the MB tranny in the 928 with the direct 1:1 final drive is more efficient than many autoboxes, so you may want to us 18% drivetrain loss. Doesn't really matter what you use since it is the power to the wheels that count.
For fun, though, you would be at about 377 crank hp assuming 20% loss or 368 crank hp assuming 18% loss.
Either way, NICE!
For fun, though, you would be at about 377 crank hp assuming 20% loss or 368 crank hp assuming 18% loss.
Either way, NICE!
08-22-2005, 12:17 PM
#3
Cruisin'
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Thanks Cameron. That's what I thought and that's what was expected. If you carefully assemble the engine, replacing with new parts where needed, using all the know how (incl GTS piston modification), port the heads and the dyno shows 302 rwhp I suppose it's safe to assume all has been done correctly. And that's just great.
I've heard that 280 rwhp is expected from stock GTS automatic, is that correct? Anyone?
I've heard that 280 rwhp is expected from stock GTS automatic, is that correct? Anyone?
08-22-2005, 05:57 PM
#6
Cruisin'
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Marc, you might have heard the story from Anders, but this is the engine with "your" block+modified pistons! 302 rwhp is a great start, let's see if I can get it up to 320 rwhp by using your new 1 3/4" headers, RMB and a new chip...
Should get some extra ponies anyway!
Should get some extra ponies anyway!
08-22-2005, 06:51 PM
#7
Race Director
Ola, you better hurry up and order those headers! 
I will get you the paperwork you requested today!
Btw, I drove Olas GTS from Stockholm to Malmö when I was in Sweden last week. A nice 4 hour trip with a +100 mph average. Unfortunately Ola didn't let me drive faster than 255 km/h..
I will get you the paperwork you requested today!
Btw, I drove Olas GTS from Stockholm to Malmö when I was in Sweden last week. A nice 4 hour trip with a +100 mph average. Unfortunately Ola didn't let me drive faster than 255 km/h..
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08-22-2005, 07:58 PM
#9
Instructor
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I'll chime in here - 1 3/4" headers seem to work best for any engine over 5.0 liters, so you should probably go for the larger size. Let us know I'm working on finalizing the batch order today & tomorrow.
Thanks!
Susan Thomas
DEVEK
Thanks!
Susan Thomas
DEVEK
.....Also, we managed over 340 rwhp on a GTS wth 1 3/4 Headers and dual 3" with cat exhaust.