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Engine Rebuild Part 3 (the finale)

 
Old 03-29-2012, 12:15 PM
  #166  
logray
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Awesome, thanks JR! Willows is pretty close to me. I'll call them up today. ... also I noticed they have an open track day TODAY!!!! $250 for the full day. Too bad my 996 isn't race prepped. Hmmmmm....

uber: IACV winding and ohms: http://www.renntech.org/forums/topic...new-cel-codes/
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Old 03-29-2012, 12:30 PM
  #167  
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Originally Posted by logray View Post
Awesome, thanks JR! Willows is pretty close to me. I'll call them up today. ... also I noticed they have an open track day TODAY!!!! $250 for the full day. Too bad my 996 isn't race prepped. Hmmmmm....

uber: IACV winding and ohms: http://www.renntech.org/forums/topic...new-cel-codes/
How could you resist??? Bring a helmet and turn some laps! Im hitting the track Saturday.
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Old 03-29-2012, 12:37 PM
  #168  
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I know... too good to be true... but I would have to "sneak" past inspection without an extinguisher, cage, & kill switch.

I just looked up the dyno info at thunderhill, only $60 for three pulls! Now that's more like it!

http://www.mcedyno.com/MCE%20RACING%20-%20Pricing.html
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Old 03-29-2012, 12:39 PM
  #169  
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They require a a cage and kill switch for a DE? That's crazy... what club is this? no way to "sneak" past if that's the case.
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Old 03-29-2012, 12:51 PM
  #170  
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It's an open day for race prepped cars only today (no street cars)... not a DE... they do have OPEN days though sometimes for street cars.
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Old 03-29-2012, 10:02 PM
  #171  
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Dyno results from a awd dynojet. Not entirely what I was expecting.

Stock intake, stock air filter, no porting. Fabspeed headers, 3.6L stock mufflers. Maybe it can't breathe well enough. I have a K&N I can throw on there and also have a Softronic ECU tune I can install.

Something doesn't look right, and my butt dyno agrees with me. Sure sounds good though. Watch and listen to this thing scream !!!!


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Old 03-29-2012, 11:12 PM
  #172  
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Must be a conservative dyno. Feels stronger than that. Is it fully broken in? It's screaming for an exhaust!!
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Old 03-30-2012, 01:10 PM
  #173  
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1300 miles on the rebuild, I would think most of the break in is done by now.

Either I've stunned everyone with monumental numbers or all the gearheads are over in the racing forum.

I did a little analysis, if someone wants to check the numbers.

------------------------------------------------
Stock 3.4L numbers from the WSM:
------------------------------------------------

300 din @ 6800 rpm (2000-2001 year engines)
296 din (1998-1999 year engines)

After LNE 3.4-> 3.6L upgrade
Measured 264.12 ft/lbs dynojet SAE rwhp

@ 20% loss, 317 SAE FW / 321 DIN / 325 STD
@ 15% loss, 304 SAE FW / 308 DIN / 312 STD

Depending on drivetrain loss, a gain of as much as 25 DIN HP over a brand new stock 1999 3.4L after the 33.33 cc increase per cylinder !!!

Certainly my 3.4L was NOT making 296 HP before I took the knife to it, so my actual gains are much higher (no I did not dyno before the rebuild). It was both tired (150 compression) and sick (cylinder contamination).

------------------------------------------------
Stock torque numbers
------------------------------------------------

258 ft/lbs @ 4750 rpm

Measured 225, a very flat 200-225 mind you, which certainly mirrors how the car feels, pick any gear at any speed above 3500 rpm and you can't go wrong.

But certainly not 258 the factory measured from stock. This was unexpected and a little disappointing. Maybe the aftermarket exhaust manifolds are hurting, or lack of complimentary intake mods. Maybe they picked the wrong gear for the pulls.

-----------------------------
AFR
-----------------------------

Looks suspiciously perfect to me.

Maybe the engine was too cold, or maybe it's time to do more mods!

Any thoughts?

Last edited by logray; 03-30-2012 at 01:41 PM.
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Old 03-30-2012, 03:05 PM
  #174  
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What gear was used on the dyno??

I had my car dynoed before the rebuild and got 255hp on the wheel's on 5th gear.
4th gear pull was 243hp on the wheel's
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Old 03-30-2012, 04:54 PM
  #175  
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Looks like you are in the ballpark .If we take speed r II dyno number of 255 and and compute drivetrain loss - 255/296=86 % or 14% loss .
This will be controversial-996 power factor 3400cc/296=.087
3600x.087=313.2 at the flywheel or 313.2x86%drivetrain loss=269 rwhp
The logic is that the only thing that has changed (so far) is displacement .Therefore it should be a pretty good relationship and the power factor is a reasonable yardstick .
Three things come to mind -200 cell cats -Jakes cams and a DME adjustment .A goal of 100hp per liter sounds about right .Assuming the heads can support the required flow .
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Old 03-30-2012, 06:05 PM
  #176  
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Your TQ numbers seem low compaired to Prodrivers. Did you install a new clutch plate? Or maybe your tires were slipping a bit?
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Old 03-30-2012, 07:48 PM
  #177  
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SpeedrII, it was done in 4th, I'm pretty sure that's the standard. 5th would spin the wheels awfully fast, maybe 150mph+ in 5th at 7000rpm? I'm just saying maybe they picked 2nd or 6th, I doubt 6th though because it would have taken forever to get to 7000rpm and would have noticed the problem right away. After watching the video again I think it was 4th, 2nd would have spun up really fast, and the spoiler would have barely deployed at the top end of 2nd, it came up well before that.

Tusler, yes the torque numbers are a little low . Yep, new clutch disc with about 250 miles on it (and I went through break in with it already, no sense of slippage on the road at WOT after break in). Not sure about tire slippage but they certainly had it ratched down well with about 8 straps between front and back. The rears were at 44psi and it was a 55 degree day IIRC.

drechel, I agree, I think this is ballpark for HP and I'm quite happy with that, just that the torque numbers seemed slightly low.

I think with porting, ECU, and CAI I could probably squeeze out a few more. Maybe I'll throw the K&N filter in the stock box for a little more sound (it is awfully tame now compared to how it used to be with the full fabspeed it).

But I think I am very happy at this point, and I'm not going to change anything major with the car, just drive it and enjoy it !!!!
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Old 03-30-2012, 08:37 PM
  #178  
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One area that could unleash more of the engines potential is the throttle body .I thought I read that the 3.6 was using a larger bore .Plently of places provide that service -especially in California .
One again thank you for sharing the build and the all the pictures .It has been a terific education and most interesting .It will be boring without your project to track .
Dave
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Old 03-30-2012, 09:43 PM
  #179  
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OTH the TQ stays up nonce up and thats a good thing.

Is your TB the cable operated one? Measure the ID of it and if its smaller than 74mm. I have a spare 74mm you can try out.
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Old 03-31-2012, 09:14 AM
  #180  
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Originally Posted by logray View Post
SpeedrII, it was done in 4th...
To my knowledge, cars should be dynoed on the gear that is closest to 1 ratio.
On 996 it's 5th gear... I bet that you would gain some hp if you dyno the car again with 5th gear.
Wheelspeed is high, about 240km/h. If the dyno allows thesekind of speed's I would do new pull's

Originally Posted by logray View Post
But I think I am very happy at this point, and I'm not going to change anything major with the car, just drive it and enjoy it !!!!
+1

Was the dyno inertia or brake dyno?
I believe that inertiadyno will show lower torgue figures allso, if dynoed in too small gear
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