Dynamometer Results & Comparisons - MS4 + 799 heads + slipping clutch = 417 rwhp, 390ish rwtq

Just got the engine tuned last night by Pat G, and actually made it all the way back to Houston without any carnage, no matter the size, ha! This is my first successful tear down/reassembly, so I was happy that nothing has broken thus far. Granted I did not get into the bottom end, but taking off and putting on new heads, cam, etc, was a learning experience for me.

The video below is the 1st 4th gear pass with the stock clutch overheating and slipping at 6000+ RPMs. The only way we reached peak without horrible slippage is a 3rd gear run.

This was performed on a Mustang Dyno down in Victoria TX with the following mods

MS4 on 111 installed straight up
STOCK 799 heads
PRC gold double springs
Comp Cams 7.400 PRs
LS7 Lifters
MLS 0.052 crushed GM head gaskets
ARP head bolts
New oil pressure switch, grrrr...
LS2 timing chaing
LS6 ported oil pump
stock pulleys
LS6 intake
Mac mid length headerss
O/R Y pipe
Borla CB uncorked
12 bolt with 3.42s w/ 17" Z06 wheels
stock tranny and slipping clutch
Home ported TB
MTI Lid
MSD wires
AND an oil leak

This is the Current Run
http://i518.photobucket.com/albums/u344/blockler/MS4799DynoGraph-1.jpg


This is a comparison of last Saturdays run with Cam only
http://i518.photobucket.com/albums/u344/blockler/MS4799ComparisonDynoGraph-1.jpg



This is the video of the 1st 4th gear pass with the clutch slipping, bouncing off the rev-limiter, and flames shooting out the exhaust. Sorry it is sideways, I attempted to shoot it straight up, but Cycorder is weird...
http://i518.photobucket.com/albums/u344/blockler/th_MS47994thgear-slippingclutch.jpg (http://s518.photobucket.com/albums/u344/blockler/?action=view&current=MS47994thgear-slippingclutch.flv)


What do ya think?

So you didnt have to do any flycutting?

nope, the 799 heads, from my understanding, take it with a grain of salt as I am nowhere near an expert, have the same valve clearances as the 241s, just a tighter CC, and same solid valves as the 241s.

How do you like the 799 heads? I just recently picked up a set from a member on here, the heads suppose to be identicle to the 243's, just a later version of them. That's good power through a slipping clutch. Congrats!

I like them, they picked up great power out of the box without losing anything down low. They also change the exhaust note, to a better sounding growl due to the bump in compression. Also, Pat had to take even more fuel away down low, so I think gas mileage wont be that terrible.

I think the 417 run was pretty representative of what it would run without a slipping clutch, as it didn't go banging into the rev limiter, haha

Looks good man :thumb:

Looks good man :thumb:

thanks man.


I finally went WOT with this setup tonight. I wanted to wait til I got back to Houston, drove a little more with it, put it through a few heat cycles and retorque the rocker bolts to verify everything was still good. Well I did all that tonight after school and then took my buddy for a ride...

Holy fuck, this thing pulls like a freight train. I used to be able to do a 1-4 gear pull and the clutch pedal would stick, but I could still get it out of fourth before it was frozen solid to the floor. Then just unstick it with my foot and call it a day. NOW, I can go to the top of 2nd, and I cant hardly get it out of second. The clutch is glued to the floor and is garbage to operate til it cools back down. I need a clutch so friggin bad. haha

Nice gains withe the heads. Did you have them mulled at all?

nope, worried bout P2V

I remember the first time I got to go WOT with my cam..:drive: Wow Fun..now I need more

I need more too, like LTs, better ORY, UD pulleys, better intake system ie manifold, TB, LID, MAF, etc. But first things first, I cant even put the measly power I make now down.

Sorry, the photobucket viewer sucks, so here is one on youtube, again, sorry its sideways, im sure there are ways to fix it, but honestly I dont care.

http://www.youtube.com/watch?v=VW4rK83SEYA (Youtube video)

Whats the litte dip in both graphs?...and why is the AFR so unsteady?

Whats the litte dip in both graphs?...and why is the AFR so unsteady?

My guess the dips would be the clutch slipping considering thats right where peak torque would of been made, but I am no guru of dynos or graph, so I dont really know. I also dont know about the AFR, you would have to ask Pat G about that one.

I made close to the same numbers with my old setup. Look in sig, search youtube under nubbz1984 for vids of my car. The vids were on a mustang dyno, the new numbers were on dynojet.