Stock bottom end PT76 Turbo LS1 717 rwhp / 720 ftlbs
10-01-2011, 08:11 PM
#1
Stock bottom end PT76 Turbo LS1 717 rwhp / 720 ftlbs Went to our local dyno day event and decided to see what a little extra boost (12.5lbs) with the precision turbo would do. My TC76 made 580 rwhp on 7lbs so I about **** my pants when the guys told me it made over 700. Almost everyone was wondering what just happened. It was a dyno shoot out event and I won the Highest Turbo car trophy, another guy with a twin turbo 470 BB put down 900 rwhp but he was under boost + nitrous class. This was through my SLP Dual Dual!! It made 729 through the cutout but ran out of fuel pump on 5 degrees of timing.
130k stock bottom end LS1
.020" milled 243's with a 5 angle valve job I did
11:1 compression, BRE 224 cam, self ported fast 85
NGK BR7EF plugs gapped at .028"
Single walbro with 60lb injectors
AlkyControl 15gph nozzle meth kit, 100% meth
KYTP TC76 truck manifold kit with Precision 76GTS on 12.5lbs
MWC 9" with 3.5 gears and 21lb driveshaft
26x11.5-15 M&H Slicks
T56 with Mcleod twin disc RXT clutch (badass)
SLP dual dual exhaust with 4" DMH cutout
Peak hp 717 @ 6100 and Peak tq 720 @ 4700, see post #14 for more info
Trophy I won
http://www.youtube.com/watch?v=_Ce_MEJ-j5o
130k stock bottom end LS1
.020" milled 243's with a 5 angle valve job I did
11:1 compression, BRE 224 cam, self ported fast 85
NGK BR7EF plugs gapped at .028"
Single walbro with 60lb injectors
AlkyControl 15gph nozzle meth kit, 100% meth
KYTP TC76 truck manifold kit with Precision 76GTS on 12.5lbs
MWC 9" with 3.5 gears and 21lb driveshaft
26x11.5-15 M&H Slicks
T56 with Mcleod twin disc RXT clutch (badass)
SLP dual dual exhaust with 4" DMH cutout
Peak hp 717 @ 6100 and Peak tq 720 @ 4700, see post #14 for more info
Trophy I won
http://www.youtube.com/watch?v=_Ce_MEJ-j5o
Last edited by Nitroused383; 10-05-2011 at 03:57 PM.
10-01-2011, 08:21 PM
#2
Those are some really nice results. It is interesting to see the high dcr cam and the turbo working so well together. What kind of gas was in it? Meth?
I haven't installed it yet, but I have the Mcleod RST and wish I would have bought the RXT.
I haven't installed it yet, but I have the Mcleod RST and wish I would have bought the RXT.
10-01-2011, 08:35 PM
#3
I had 3 gallons of trick 108 unleaded with 1.5 gallons of 100 LL av gas and the rest was 6-7 gallons of 92 pump gas. 100% straight meth injection with a 15 gph fire hose haha. I was very surprised with the results and even more surprised it didn't blow up. I would see if you can get the RXT, I daily drive with this thing and it drives very nice. All my friends with monster's can't believe how light the pedal is and it doesn't squeel.
10-02-2011, 03:20 PM
#7
Thanks guys I actually made 5 passes at the track friday before I hit the dyno on saturday. Unfortunately I got kicked off the track on the pass that I ran it all the way out. I never did any tuning at that high of boost so when I made my pass it was at 9.5-10 afr with 3-5 degrees of timing going down the track lol, I ran a 10.64 @ 133 with easy shifts. I know when I power shift it picks up 3-4 mph just by keeping the boost up, but I've stopped power shifting cause I don't want to hurt the tranny.
Heads are unported 243's that are milled .020 that I did a 5 angle valve job to with hand blending.
Fast 85 I ported with a 85mm throttle body. The cam isn't a boost cam at all has 10 degrees of overlap 224/23x 61x / 61x 110lsa. My car made 444 rwhp / 414 tq before the turbo.
I had about 20 hours into the valve job on the heads because I did everything by hand with stone wheels. That fast I ported had 10-15 hours of hand porting and reshaping too.
Heads are unported 243's that are milled .020 that I did a 5 angle valve job to with hand blending.
Fast 85 I ported with a 85mm throttle body. The cam isn't a boost cam at all has 10 degrees of overlap 224/23x 61x / 61x 110lsa. My car made 444 rwhp / 414 tq before the turbo.
I had about 20 hours into the valve job on the heads because I did everything by hand with stone wheels. That fast I ported had 10-15 hours of hand porting and reshaping too.
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10-02-2011, 06:02 PM
#10
It's the end of the season here anyways so I just wanted to push it a little with race gas. I think if you keep detonation out of these stock blocks they can live for a little while with high power. I might run at the track one more time but I've been booted off twice for no cage 
I don't have facebook so whats going on?
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Push to connect fittings
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Austinma62 (12-19-2020)
10-05-2011, 03:54 PM
#14
I found out the torque isn't actually 800, which I suspected was off since the rpm increments didn't match up at all. I have been driving around on 26x11.5-15 M&H cheater slicks but prior to turning up the boost I was running 275/40-17 MT Et street radials, they did pretty good on 8lbs. I plan to hit the track back up this friday but we will see what the weather does, they keep kicking me off anyways! Here is more accurate info.
I think the 800 ft lbs is not accurate as the graph appears to be shifted over 1000 rpm. No way was I making 400 ftlbs at 2500 rpm with .2lbs of boost, it made 4lbs at 3000 and 12 lbs at 3800. From looking at the graph in mph I pulled up to 140mph which is 6250. Peak looks to be at 6100.
The hp calcuations are correct based off mph and acceleration rate of the rollers. So by using some online calculators to come up with torque base off rpm and hp here are rough torque numbers. They were having issues with the tach signal so they marked a pulley and put a piece of tape on it using a known diameter and had some sort of timing light on it to roughly calculate rpm.
Looks like 717 hp @ 6100
Peak torque is 720 @ 4700
3000 = 381 ftlbs
3500 = 532
4000 = 667
4500 = 708
5000 = 688
5500 = 657
6000 = 628
I think the 800 ft lbs is not accurate as the graph appears to be shifted over 1000 rpm. No way was I making 400 ftlbs at 2500 rpm with .2lbs of boost, it made 4lbs at 3000 and 12 lbs at 3800. From looking at the graph in mph I pulled up to 140mph which is 6250. Peak looks to be at 6100.
The hp calcuations are correct based off mph and acceleration rate of the rollers. So by using some online calculators to come up with torque base off rpm and hp here are rough torque numbers. They were having issues with the tach signal so they marked a pulley and put a piece of tape on it using a known diameter and had some sort of timing light on it to roughly calculate rpm.
Looks like 717 hp @ 6100
Peak torque is 720 @ 4700
3000 = 381 ftlbs
3500 = 532
4000 = 667
4500 = 708
5000 = 688
5500 = 657
6000 = 628
10-05-2011, 04:15 PM
#16
Thats awesome man, congrats. People on my local board are speculating how long the block will hold together haha. Did you tune for the race/pump gas mix? Im going to be running an identical fuel system with 100% meth too. i was wondering if tuning for just 93 but still adding 100+octane gas will help fight detonation even more?
10-05-2011, 04:34 PM
#17
Thank you man, I don't know how long it will last but I've seen over 15lbs of boost on the street / track a few times (oops accident!) even with out the race gas 
I've never tuned the boost this high so this VE area of my tune was way rich. This is with out any tuning, just strapped it down and made 2 pulls. AFR was pig rich bottom 10s from 3000-5000 rpm and went up to about 10.5 by 6000. If you have a pump gas tune and all you do is add race gas than yes it will definitely help fight detonation as long as it's not some oxyegenated fuel like q16.
I've never tuned the boost this high so this VE area of my tune was way rich. This is with out any tuning, just strapped it down and made 2 pulls. AFR was pig rich bottom 10s from 3000-5000 rpm and went up to about 10.5 by 6000. If you have a pump gas tune and all you do is add race gas than yes it will definitely help fight detonation as long as it's not some oxyegenated fuel like q16. 
10-06-2011, 05:35 AM
#20
Once it goes above 14 lbs of boost the tune pulls 10 degrees of timing and commands 10.0 afr. It made 729 hp on 15lbs of boost but only 3-5 degrees of timing with the cutout open. The pull that made 717 was through the slp dual dual 12.5 lbs @ 4000 rpm and than taper down to 11.5 lbs by 6000, 13 degrees of timing from 4000-5000 rpm than up to 6000 I run 15 degrees. The few times it hit 15lbs while driving the car it ran like crap and I know right away to let off.