Tested My New 3.4/3.6 Motor Yesterday....
01-25-2012, 01:41 PM
#16
Race Director
01-25-2012, 03:34 PM
#19
I did, and I still do not see your point.
JR went from ~ 270 RWHP or so with the 3.4 to some new number with the 3.6. He hopes it is 290, I estimate it is closer to 310. This is a ~ 35-40 HP bump which is not unreasonable from a new engine, with 0.2 L more dispacement and decked heads (increased compression).
My engine was a 3.4 M97 and made ~305 RWHP. The new engine is a 3.8 and made 355, so ~ 50 more HP from 0.4 L displacement increase. The heads were already decked in the 3.4 so no added/similar gain there.
So I still do not see anyhting that claims 0.4 L = 85 HP.
Please help me understand.
Cheers,
JR went from ~ 270 RWHP or so with the 3.4 to some new number with the 3.6. He hopes it is 290, I estimate it is closer to 310. This is a ~ 35-40 HP bump which is not unreasonable from a new engine, with 0.2 L more dispacement and decked heads (increased compression).
My engine was a 3.4 M97 and made ~305 RWHP. The new engine is a 3.8 and made 355, so ~ 50 more HP from 0.4 L displacement increase. The heads were already decked in the 3.4 so no added/similar gain there.
So I still do not see anyhting that claims 0.4 L = 85 HP.
Please help me understand.
Cheers,
01-25-2012, 03:46 PM
#20
Drifting
I think he missed that you started with an M97 engine with dual variocam, a 7.8DME and 305HP.
thus +40HP, not +85HP (off 270HP of the 3.4L M96 w/ 5.5.2 DME)
or I'm confused .....
Mike
thus +40HP, not +85HP (off 270HP of the 3.4L M96 w/ 5.5.2 DME)
or I'm confused .....
Mike
01-26-2012, 01:02 AM
#21
Race Director
Had a 3.4 converted to 3.6 similar to Logray's build, just not nearly as intensive. With mine we just installed a 3.6 crank and rods into the existing 3.4 cases. There's some minor machining involved, but it's really a very simple install. Cleaned up and slightly decked the OEM 3.4 heads & cams, and took it to Willow Springs. I kept out of the throttle for the first few minutes but gradually opened it up taking it higher into the rev range.
I was running with a friend in his new 3.8 Cayman S with 3.4 heads, etc. He dyno'd at 355 rwhp and I haven't dyno'd mine yet. I'm 200 lbs lighter and we were perfectly matched down the straight so I'm estimating I'm around 290 rwhp. My previous all stock 3.4 was around 270. Laps times on 6-10 HC'd slicks were in the high 1:26's, I've been to 1:25:5 on stickers so that was encouraging. I'll have dyno results Feb 11th when we have a dyno out to WS for POC's season opening race weekend. It revs up really nicely....
I was running with a friend in his new 3.8 Cayman S with 3.4 heads, etc. He dyno'd at 355 rwhp and I haven't dyno'd mine yet. I'm 200 lbs lighter and we were perfectly matched down the straight so I'm estimating I'm around 290 rwhp. My previous all stock 3.4 was around 270. Laps times on 6-10 HC'd slicks were in the high 1:26's, I've been to 1:25:5 on stickers so that was encouraging. I'll have dyno results Feb 11th when we have a dyno out to WS for POC's season opening race weekend. It revs up really nicely....
01-26-2012, 01:59 AM
#23
Race Director
01-26-2012, 02:01 AM
#24
Race Director
Doing some googling on the 3.4 power, your 270WHP looks reasonably healthy to be honest also, so I can see how you get to 29X range for the 3.6 (on the basis Porsche are reasonably honest about their ratings at the crank). I might even put my stock C4 3.4 on my flatmates dyna pac dyno to see what it does. Im am assuming mostly stock in my thoughts, increasing dynamic compression by a bit would blow it out of the water...
01-26-2012, 03:48 AM
#25
Three Wheelin'
01-26-2012, 09:28 AM
#26
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Butt Dyno,providing spot on #'s for years!
01-26-2012, 10:37 AM
#27
Different cars and different engines (and different heads, programming, etc).
355 - Cayman S with M97 - was 305 at 3.4, now 355 (+50) with 0.4 bump
270 - 996 with M96 - was 270, now 290 (+20) or 310 (+40) with 0.2 bump and shaved heads.
Comparing the 270 of the M96 to the 355 of the M97 makes no sense. I understand your math, but it is like comparing a 5.0 at 350 HP from one manufacturer and 5.0 from another and saying they should be the same. The M96 and M97, while similar are different and do make different power.
I am really not sure what you are trying to prove. Even in bold. Really, I am not trying to be a jerk, I do not get it so please explain (don't just tell me to re-read).
Which number are you suggesting is wrong? The 355 or the 270?
Cheers,
355 - Cayman S with M97 - was 305 at 3.4, now 355 (+50) with 0.4 bump
270 - 996 with M96 - was 270, now 290 (+20) or 310 (+40) with 0.2 bump and shaved heads.
Comparing the 270 of the M96 to the 355 of the M97 makes no sense. I understand your math, but it is like comparing a 5.0 at 350 HP from one manufacturer and 5.0 from another and saying they should be the same. The M96 and M97, while similar are different and do make different power.
I am really not sure what you are trying to prove. Even in bold. Really, I am not trying to be a jerk, I do not get it so please explain (don't just tell me to re-read).
Which number are you suggesting is wrong? The 355 or the 270?
Cheers,
01-26-2012, 10:49 AM
#28
I would stop Vision Motorsports or give Dwain Dement a call and ask him. They ran these cars in Koni GS years ago so I suspect that if anyone will know it is him.
Cheers,
01-26-2012, 12:47 PM
#29
Nordschleife Master
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You'll know when you need one as the white smoke on startup is highly visible. I wouldn't worry about it until then.
PS: Let the car idle a minute or 2 after a hard session to allow the vapors to make their way back thru the system to the sump....
