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Yet another "Guess my numbers" thread.

3.8K views 55 replies 17 participants last post by  fasterthangas  
#1 ·
After months of fighting demons; my car is finally at the tuners. It's always fun to share a build and see what numbers folks guess for HP and Tq.

Build:
347
3.4" stroke
4.03" bore
.041" Quench
10:1 CR
91 pump gas
56cc AFR 185 Renegades with upgraded spring package
1.6 RR's
Systemax ll (Upper port matched to lower, intake ports cleaned up and matched to AFR's, upper opened to 75mm.) Work completed by FTI.
75mm TB
Lightning 90mm MAF with 4" piping
Mac 1-3/4" shorties into H pipe and out 2.5" duals. Straight through mufflers.
Ford LU34A injectors
Custom Comp cam:
.577 .574 lift
280/290 advertised
230/238 @ .050
7 BTDC 43 ABDC
55 BBDC 3 ATDC
112 Lobe seperation
108 Intake centerline

T5 tranny
25.6" tires
4.10 gears
 
#21 ·
The results are in!

411hp @ roughly 6000

435tq @ roughly 4400

Runs were on a Mustang dyno. I'll be posting dyno graphs. They are raw data with no smoothing or fancy manipulation.
 
#23 ·
Dyno Graphs

These graphs are difficult to read but the tuner prefers raw, unadulterated data. With this type of data; the Tq numbers are skewed by the gear ratio and rear tire size. The Tq reads higher than actual on the graph. With a simple calculation he quoted 435 for Tq. The guy has been tuning for 27 years. The engine has more of a mid to high power curve that I'm not use to. It is very streetable but a tad soggy down low. It's best to launch with some rpm's. Toss her down a gear and she sets me back in the seat. With the 4.10's; she is peaking at roughly 110mph in 4th. I think I'll back her down to 3.73's. There isn't much of a lope at idle so she's a bit of a sleeper with the Dynomax VT mufflers. The fuel trims are getting skewed by fan wash from the electric fans. I'm most likely going to put the filter into the fenderwell. I won't gain any power but the fuel trims cruising around town will be more stable. The Systemax intake is suffering from heat soak thus creating a hard start situation when up to temp. After the car sits for a bit; the starting process occasionally requires a slight opening of the throttle.
All in all; the build exceeded my expectations. Time to drive the snot out of her! :grin2:
 

Attachments

#28 ·
My car is set up for handling so I suspect it wouldn't make much of a drag car. It would be fun though. I wonder what would break first? The T5 or the 28 spline stock shafts? :grin2:
 
#25 ·
Sweet! Missed it by 1 hp - I actually based my guess on my NA numbers and our differences. IIRC, I made ~360 rwhp N/A. You have more compression (10.0 vs 8.8), I have more cubes (365 vs 347 - probably makes the compression difference a wash), similar heads (mine flowed 292 on a bench, yours are advertised at 297), similar cams with a slight NA edge to you (you: 230/238 on a 112; me 228/242 on a 116); and trans differences - t5 takes about 15%; stalled glide takes about 25%. I figured I was at about 480 fwhp based on losses and injector duty cycle. 480 x .85 = 408; add in a few hp for the cam, and there you go - my 412 hp guess. The 6250 part was because my motor peaked around 6,150 - but the rpm pickup was a bit wonky at the time (I only got mph readings I think).

In any event, I went 117 mph at ~3,400 lbs with that (my ET sucked because the converter was setup for the blower - went 11.9x); you should be able to hit 121-122 mph if your weight is similar - definitely enough to get you into the low 11's. Of course, your altitude will play a role in what's actually possible. Hit the track and see what it'll do!

Congrats again.
 
#29 ·
That's some creative math! You were spot on. I'm sure that my car is as heavy as yours. The power seats weigh a ton alone. What gears and tire size were you running to trap 117mph? My car is hitting a wall around 110mph in 4th with 4.10 gears and 25.5" tires.
Thanks Alex!
 
#31 ·
The Tuner is Rob Wetzel of Forced Induction Tuning and Fabrication. Check out this crazy twin turbo setup that Rob fabbed and tuned for this already supercharged GN.

https://www.engineswapdepot.com/?p=5103
 
#33 ·
My car is set up for handling so I suspect it wouldn't make much of a drag car. It would be fun though. I wonder what would break first? The T5 or the 28 spline stock shafts?
Image
[/QUOTE]
I think the T5 will go first, if you need a stronger trans I got a tko for sale, nothing like a local pick up lol :smirk:. Did he tune with your QH set up or did you go a different route?
 
#34 ·
My car is set up for handling so I suspect it wouldn't make much of a drag car. It would be fun though. I wonder what would break first? The T5 or the 28 spline stock shafts?
Image
I think the T5 will go first, if you need a stronger trans I got a tko for sale, nothing like a local pick up lol :smirk:. Did he tune with your QH set up or did you go a different route?[/QUOTE]

TKO sounds tempting other than the notchy shifting. He tuned with SCT.
I'll be selling all of my Moates stuff.
 
#39 ·
My last 347 fell way short with what I thought was a decent combo. The beauty of a stroker is the power made at lower rpm levels. Also; good machine work, the weight of rotating parts and attention to detail are just as important as heads and cam.
 
#38 ·
Did anyone catch that the above numbers are achieved using 34lb injectors? I also run a factory non-adjustable fuel regulator. I just thought about this. I would have thought the 34's would have been pegged.
 
#46 ·
Assuming the dyno numbers are accurate, my guess is you're on the right track with your line of thought. The only reason I question the power number is because you mentioned that he had to calculate something to give you that 435tq number. It looks like the graph reads torque max to be 456 and power to be 411. Given that power is derived from torque, why does it seem that he edited the torque number but did not edit the power number he quoted you? Am I missing something?

Either way, the injector table for the LU34A (coyote injectors, right?) shows that it has a High Slope of 40.556lbs @ 55psi. This should mean they are rated at 34lbs at 43.5psi, but they actually flow 40.556 lbs at 55psi.

With your factory fuel regulator, you're probably pushing around 85% duty cycle... maxing them out at that psi. You could crank up the fuel pressure and adjust the tune to give yourself some cushion without changing the injectors.
 
#44 ·
Numbers Looked pretty good! Sure that intake had something to do with it. Not to Hijack a thread, but I know Tony at Astro has 3 used 9310 mainshafts for a T5's. If that is a concern. Also I have a Mark Williams 28 spline slip yoke, used, but good as new, including a new 3130/3150 combo joint. Cheap. Also a FMS driveshaft with a Strange moly slip joint. Almost like new. Cheap. I should post that in the driveline section. Sooner or later I will.