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New Decade, New Motor - My 4.5l DeMan Motorsport Build

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Old 02-08-2020 | 07:03 PM
  #91  
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Obviously contact them for real estimates
but I recall 30k with their headers, exhaust, intake. Upgrading to an rs style intake was more
in other words turnkey at around 30k, with nothing else to do
did not discuss gearing.

edit rick was great to talk to, will answer any questions you have.
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Old 02-08-2020 | 07:15 PM
  #92  
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30k also include X51 heads/cams?
Old 02-08-2020 | 10:08 PM
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Watch the whole thing and enjoy the sound or fast forward to 3:02 and watch the 4.5L GT4 just disappear in front of the 991.2 GT3rs with it's pedal on the floor

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Old 02-09-2020 | 12:15 AM
  #94  
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Originally Posted by sgreer78
Hopefully without soliciting the if you have to ask... question, what's a 4.5L conversion/swap cost? Ballpark, I'd assume everyone varies a little.

Also, when swapping out gear is there ECU changes to keep speedo and odo accurate?

Thanks!
Originally Posted by Dr.Bill
I saw in another thread an estimate of about $28k. Not sure which options were included, but that should tell you the ballpark.

Speedo and odo are based off the wheel or axle sensor. Tire size will make small errors. Gearing has nothing to do with it.
Originally Posted by 9elheven
Exactly! But, it'll cost almost another $10k for that too. I'm thinking the price is over $40k, and I don't think that includes tax. My wife might object to that. I would hate to have to do what user1029 did in his avatar...
Originally Posted by user1029
30k also include X51 heads/cams?
Originally Posted by Ksdaoski
Obviously contact them for real estimates
but I recall 30k with their headers, exhaust, intake. Upgrading to an rs style intake was more
in other words turnkey at around 30k, with nothing else to do
did not discuss gearing.

edit rick was great to talk to, will answer any questions you have.
Ok a lot of quote and price questions, I posted in the thread a little earlier about this, but you guys are all in the ballpark regarding motor costs, actually close to dead on Options drive it up from there, you have to factor in clutch and flywheel (required upgrade), gearing as optional (range from 4k to $7k-ish not $10k), headers (cat-less or cats - Rick actually has specific headers made for this package that are insanely nice and frankly affordable), and then of course decisions around the exhaust (a lot of folks do the GT3 exhaust which is usually around $7k). So yes just like anything Porsche options add up and fast

Originally Posted by 9elheven
Rhetorical question: if you go for the 4.5L upgrade, doesn't one kind of "have to" do the gears as well to get the most out of this platform?
So oddly enough not really. I drove both cars at DeMan and the gearing was a really tough call on whether to do it or not. Let alone which brand of gearing and which gears to do and not do. Much of this depends on where you drive the car the most, its use case (street vs track), and also how you drive and how you want the cars drive-ability to be/feel.

The power of the new motor teaches you that its not actually a gearing problem that hamstrings GT4's as much as its funky-*** power dips in the stock HP and TQ curves that truly kill the cars fun factor. The gearing choices also have a few variations between brands so its a little bit of a rabbit hole, but Rick's got all the charts and info you need to make a really good decision there.
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Old 02-09-2020 | 12:21 AM
  #95  
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Old 02-09-2020 | 02:17 AM
  #96  
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Originally Posted by BealeAss
The power of the new motor teaches you that its not actually a gearing problem that hamstrings GT4
Right. I don't remember anyone complaining about the ~90mph 2nd gear in the Viper or the GT500

​​​​​Still though, until we hit 600+ ft/lbs I like the shorter gearing...
Old 02-09-2020 | 09:49 AM
  #97  
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Originally Posted by ajw45
Right. I don't remember anyone complaining about the ~90mph 2nd gear in the Viper or the GT500

​​​​​Still though, until we hit 600+ ft/lbs I like the shorter gearing...
Same , but I wanted it to be honest its def not required especially if the goal is to keep the build within a smaller cost window. And arguably can 100% those those after the fact if you felt like it was still a missing piece.

What I like about it the most is it gets MUCH closer to the gearing I user to have in my 996 GT3 which I always felt on the street was just perfect. You could bang into 4th merging on a highway without being at complete arrest me speeds and on backroads it was a lot of 2/3 shifts.
Old 02-09-2020 | 01:50 PM
  #98  
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Originally Posted by ajw45
Watch the whole thing and enjoy the sound or fast forward to 3:02 and watch the 4.5L GT4 just disappear in front of the 991.2 GT3rs with it's pedal on the floor

https://youtu.be/HqlxYnGSEKk
…and the side by side:

https://www.instagram.com/tv/B8WjKlsHlMX/

Great videos for anyone that thought the GT3RS might've been sandbagging it—upshifting at 9k RPM and still just keeping pace on the straights. Man, I love the honest-to-goodness engineering solutions that make stuff like this possible.
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Old 02-09-2020 | 11:47 PM
  #99  
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Folks, thanks for the input, it's very elucidating. I got a ride from Rick in the 4.25L upgrade at the last open house we set up, but perhaps another talk will be worthwhile...for us both.
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Old 02-10-2020 | 12:20 AM
  #100  
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Originally Posted by burnergt4
…and the side by side:

https://www.instagram.com/tv/B8WjKlsHlMX/

Great videos for anyone that thought the GT3RS might've been sandbagging it—upshifting at 9k RPM and still just keeping pace on the straights. Man, I love the honest-to-goodness engineering solutions that make stuff like this possible.
...and the GT3rs should be on the power earlier coming out of slower corners so its really impressive it still can't catch up. It also helps explains how 4.5L seems to pull even harder on the GT3rs after grabbing a gear or two on the straight - once the corner exit traction and acceleration advantage of the GT3rs is gone it's all motor down the back half of the straight and that's when the GT3rs gets small fast in the rear camera.
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Old 02-10-2020 | 02:24 AM
  #101  
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Originally Posted by ajw45
...and the GT3rs should be on the power earlier coming out of slower corners so its really impressive it still can't catch up. It also helps explains how 4.5L seems to pull even harder on the GT3rs after grabbing a gear or two on the straight - once the corner exit traction and acceleration advantage of the GT3rs is gone it's all motor down the back half of the straight and that's when the GT3rs gets small fast in the rear camera.
What I find most interesting there is that even with a draft the GT3RS didn't gain anything back. For a car with the extra aero drag it says something.
And then add in the GT4 also overcame the speed of PDK shifts as well...
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Old 02-10-2020 | 09:36 PM
  #102  
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I think it is imperative to state who was driving each car and on which tire compound. If Rick was in the 4.5 on a slick, and the other guy was just an advanced guy on new gen Cups, then the power output of the motor wouldn't impress me all that much.

I don't doubt the extra .7 displacement and quality of a DeMan build (I am a client btw)... but Rick vs any DE guy is like pro vs newb. He's quietly one of the fastest guys in the game. If he was younger and wasn't running an op, he'd be a series champ w ease.
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Old 02-10-2020 | 10:26 PM
  #103  
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Originally Posted by GTS_Ninja
I think it is imperative to state who was driving each car and on which tire compound. If Rick was in the 4.5 on a slick, and the other guy was just an advanced guy on new gen Cups, then the power output of the motor wouldn't impress me all that much.
For what it's worth, Rick had mentioned to me the GT4 was on PSC2s and the 911s were on slicks.
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Old 02-10-2020 | 10:52 PM
  #104  
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Originally Posted by burnergt4
For what it's worth, Rick had mentioned to me the GT4 was on PSC2s and the 911s were on slicks.
This is great intel. Now driver matters even more. If Rick was in the 4.5 and anyone else in the chat was in the RS, still huge parity.
Old 02-11-2020 | 10:20 AM
  #105  
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Originally Posted by GTS_Ninja
I think it is imperative to state who was driving each car and on which tire compound. If Rick was in the 4.5 on a slick, and the other guy was just an advanced guy on new gen Cups, then the power output of the motor wouldn't impress me all that much.

I don't doubt the extra .7 displacement and quality of a DeMan build (I am a client btw)... but Rick vs any DE guy is like pro vs newb. He's quietly one of the fastest guys in the game. If he was younger and wasn't running an op, he'd be a series champ w ease.
Thanks for the kind words!

Let me be clear about the Video. The entire intention of being on track in the GT4 4.5L was to DRAG RACE... motor to motor.. NEVER was there an intent of trying to get a lap time or out-drive the other cars.
The GT4 4.5L is a STREET car... Street 3 point seat belts, totally stock suspension including STREET alignment with used original stock PSC 2 tires that have gone through the (famous) doughnut video smoking the rear tires and a stock PCCB brake system.
The 2019 991.2 GT3RS is a dedicated track car with race brakes, Track alignment, Dunlop track tires, 6 point harnesses and so on...

I think if you watch it carefully you will see the motor is I would say, a little bit stronger. The RS has a no lift PDK trans and is arguably faster in a straight line than its manual brother. The GT4 is manual and loses a few meters of ground on every shift but still manages to stay away or even pull away.

Cheers!
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