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2014 Porsche Cayman Thread - 991 Conversion

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Old 02-23-2014, 08:53 PM
  #76  
rflavell
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Do you think it is possible to obtain 450hp with these motors? What would that entail i.e. bolt on and tune vs. Internals. What about torque?
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Old 02-25-2014, 10:43 AM
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cmb13
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Do you have any performance figures? 0-60, 1/4 mile, track times etc?
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Old 02-25-2014, 10:47 AM
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Originally Posted by rflavell
Do you think it is possible to obtain 450hp with these motors? What would that entail i.e. bolt on and tune vs. Internals. What about torque?
Well, a factory 991S motor with the PowerKit option would give you a proven 430 HP.
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Old 02-25-2014, 10:49 AM
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Also, what does the S provide that the regular does not? Seems to make more sense to get a non-S.
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Old 02-25-2014, 10:51 AM
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Originally Posted by cmb13
Also, what does the S provide that the regular does not? Seems to make more sense to get a non-S.
350 (non S) vs 400 (S). But are you talking engines or donor car? The S donor car would have better brakes and a few other standard options over the base.
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Old 02-25-2014, 11:32 AM
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No I was referring to the donor car (eg Boxster); would make sense to use a base unless there are other significant advantages to the S
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Old 03-04-2014, 10:01 PM
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Originally Posted by Cloudspin
The CTSCC Gran Sport regulations require the GTS 3.8 to be stock (408 hp) and they are sealed by the sanctioning body to eliminate performance enhancements. You're not allowed to race if the seal is broken. These regs would apply to the Rum Bum 2013 championship winning car driven by Nick Longhi referred to in the article. BTW, the stock GTS motors are also used by other Gran Sport teams which is a testament to the strength and reliability of the 9A1 motor.

The same engine regs do not apply to the DeMan Cayman builds described in the article freeing DeMan to tune the motors for higher levels of performance, as I understand it.
You have done your homework!!

The 3.8L GTS engine is outstanding right out of the box, 408 HP is Porsche's advertised rating. With unrestricted exhaust , freeing up induction side of things and ECU tuning the engines we have installed in Cayman conversions (11 to date of the X51 and 9 of the 3.8L S engine) have made a high so far of 447 HP for the X51 and 410 for the S..
We are in Love with the cars and love this conversion..

Give a call with any questions..

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Rick Deman
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Old 03-04-2014, 11:58 PM
  #83  
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I was at RRR today and Mike showed me photos of the CTSCC ST Cayman you are building for them. It looks to match the great craftsmanship and attention to detail that he and Jim have pointed out to me on the GTS GS car of theirs that you built. They're great guys and Rebel Rock and DeMan Motorsport should be a great combo. I can't wait to see them in action at Sebring and the new Cayman at Laguna Seca!

Mike
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Old 03-14-2014, 08:10 PM
  #84  
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Originally Posted by BGB Motorsports
Hi! You must be Morgan's dad. I figured you would like some photos of the project. We have removed the 987.2 3.4L, we have ordered the 3.8L and we are removing the cylinder heads for porting once that motor arrives. We are essentially making a BGB X51 swap for Morgan. He's getting all hard bushings in the drivetrain, headers, flash and one heck of a new paint job. For now, the car can go to the body shop for paint while we wait for the arrival of the 3.8L, send off the cylinder heads for porting and await the arrival of the exhaust manifolds.

I have some photos below.








I called Morgan last week to see if he wanted a baseline dyno so that all of you guys can see what you're getting for your money. She made 305rwhp which is just what a 3.4L makes. Actually, that motor is probably pretty cherry since she should have dyno'd right at 300rwhp. We hope to return with 390rwhp PLUS.

Stay tuned!

this is from a stock 3.4 981 motor!!! ?
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Old 03-14-2014, 11:44 PM
  #85  
Schmidts Cat
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No, that's a 997 S motor.. Or more like GTS (3.8L). Did you read the copy?
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Old 03-15-2014, 01:41 AM
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So the 997s 3.8 makes the same power as a 3.4 DFI??
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Old 03-15-2014, 10:36 AM
  #87  
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Originally Posted by Tbred911
So the 997s 3.8 makes the same power as a 3.4 DFI??
???? If you are referring to the dyno plot, that was a baseline pull on the stock 3.4 engine before it was pulled to put in the 3.8L
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Old 03-15-2014, 11:12 AM
  #88  
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That decent oh for a stock 3.4 DFI (no mods). Didn't know they were running that strong. Compared to the 991 3.8 it's sure down on torque but strong for a 3.4
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Old 03-15-2014, 11:55 AM
  #89  
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Originally Posted by Tbred911
That decent oh for a stock 3.4 DFI (no mods). Didn't know they were running that strong. Compared to the 991 3.8 it's sure down on torque but strong for a 3.4
Porsche seems to underrate their engines in general, which is a good thing.
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Old 03-15-2014, 02:28 PM
  #90  
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Here is an interesting offer for those needing a 3.8L engine from a 3.4

http://www.planet-9.com/987-cayman-b...ne-wanted.html
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