I lost 82 RWHP, Need Help!
07-03-2009, 08:45 AM
#1
Staging Lane
Thread Starter
iTrader: (3)
Join Date: Sep 2008
Location: Brazoria, Texas
Posts: 78
Likes: 0
Received 0 Likes
on
0 Posts
I lost 82 RWHP, Need Help! I have a LS1 bottom end PRC stage 2.5 heads, MS3 cam 42 lb injectors/255 pump, MSD coil packs. In January this year I got a dyno tune and made 439hp.I installed a 150 shot wet kit and NGK TR-6 plugs and took it back to the tuner to tune it for the nitrous, he pulled 4 degrees of timing and before the spray it only hit 358hp.Is this 82 hp loss possible from just different plugs,and pulling 4 degrees of timing, and or possibly the temperature difference on the dyno from January to June?(I checked compression and everything looks great)Any wisdom would be great!
07-03-2009, 09:47 AM
#3
Check your plugs, wires, and coils. Most likely you have dead spark in one hole. Are your wires and coils stock GM or aftermarket?
__________________
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
07-03-2009, 10:41 AM
#4
TECH Junkie
iTrader: (13)
Join Date: Sep 2004
Location: Fort Myers, FL.
Posts: 3,857
Likes: 0
Received 0 Likes
on
0 Posts
I had a similar problem, turned out that my MSD wires were all reading differently, and one was completly shot.
If you lost that much HP you should be able to tell by the seat of your pants- if you know what I mean.
If you lost that much HP you should be able to tell by the seat of your pants- if you know what I mean.
Trending Topics
07-03-2009, 01:49 PM
#9
TECH Junkie
iTrader: (13)
Join Date: Sep 2004
Location: Fort Myers, FL.
Posts: 3,857
Likes: 0
Received 0 Likes
on
0 Posts
Most likely the problem is in the MSD coils. Put some stockers back in. also check to make sure all the wires are reading correctly, and plugs are good before buying or replacing anything.
07-03-2009, 01:52 PM
#10
TECH Fanatic
I have a LS1 bottom end PRC stage 2.5 heads, MS3 cam 42 lb injectors/255 pump, MSD coil packs. In January this year I got a dyno tune and made 439hp.I installed a 150 shot wet kit and NGK TR-6 plugs and took it back to the tuner to tune it for the nitrous, he pulled 4 degrees of timing and before the spray it only hit 358hp.Is this 82 hp loss possible from just different plugs,and pulling 4 degrees of timing, and or possibly the temperature difference on the dyno from January to June?(I checked compression and everything looks great)Any wisdom would be great!
Were both dyno runs on the same dyno? Can you post graphs of both runs?
Last edited by Old SStroker; 07-04-2009 at 08:20 AM.
07-03-2009, 03:56 PM
#14
The LS1 coils are great for being able to handle great power. The MSD coil packs have been known to be crap specially for LS engines. I had one of the guys I respect very much tell me that really you only want to add that to your LS1 engine when your 700+ RWHP. Go back to the stock coils you'll find those lost ponies.
07-03-2009, 06:44 PM
#17
I didn't want to say it unless you had them, but go immediately and take off the MSD coils and wires and replace them with stockers. I have seen an insane amount of wires and coils by that company give a dead hole. No lie. If you still have your stock plugs and wires, replace them and redyno. You should find your problem.
__________________
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
07-03-2009, 07:08 PM
#19
10 Second Club
iTrader: (27)
Join Date: Sep 2008
Location: Lake Tapps, WA
Posts: 2,229
Likes: 0
Received 0 Likes
on
0 Posts
Like Patrick G said. Also you need to look at both graphs and see what's going on, does the powr aned torque climb slower or does the power fall flat at a lower rpm? All those things will give you a clue to what is going on.
