I just lost 130+rwhp
#1
I just lost 130+rwhp
Help needed ASAP
I dynoed my single turbo ZO6 last month made 584rwhp SAE 10psi
16degrees 10.7 A/F 95f weather through stock TI catback / 241 untouched heads STD 598rwhp 549rwtq
Here is the thread for those that didnt see it
https://ls1tech.com/forums/forced-in...ber-10psi.html
Last week I wanted to add more boost so I changed the spark plugs/ new msd wire/ new water pump & thermostat I also changed the head gasket (since I had an overheating issue it turned out the gasket) and rechecked everything.
Now same boost , same dyno , same tuner , same wheels same everything but slightly better weather 80f
The car made 447rwhp 11.3 A/F 13degrees tuner took to 15 and got KR made less power...
made 3-5runs all of them between 430-450rwhp the car didnt get over 180-195 temp
Oil press is great 60psi cold start 30-40psi hot, no engine noise no smoke the car runs great and pulls nice for 447rwhp
I know the stock TI catback is killing the car but we already made 584rwhp with it.
Best graph I can get for now
Any help would be much appreciated I'm doing a Compression check tomorrow.
Thanks,
Sam.
I dynoed my single turbo ZO6 last month made 584rwhp SAE 10psi
16degrees 10.7 A/F 95f weather through stock TI catback / 241 untouched heads STD 598rwhp 549rwtq
Here is the thread for those that didnt see it
https://ls1tech.com/forums/forced-in...ber-10psi.html
Last week I wanted to add more boost so I changed the spark plugs/ new msd wire/ new water pump & thermostat I also changed the head gasket (since I had an overheating issue it turned out the gasket) and rechecked everything.
Now same boost , same dyno , same tuner , same wheels same everything but slightly better weather 80f
The car made 447rwhp 11.3 A/F 13degrees tuner took to 15 and got KR made less power...
made 3-5runs all of them between 430-450rwhp the car didnt get over 180-195 temp
Oil press is great 60psi cold start 30-40psi hot, no engine noise no smoke the car runs great and pulls nice for 447rwhp
I know the stock TI catback is killing the car but we already made 584rwhp with it.
Best graph I can get for now
Any help would be much appreciated I'm doing a Compression check tomorrow.
Thanks,
Sam.
Last edited by venom ws7; 12-04-2011 at 07:32 PM.
#3
TECH Regular
iTrader: (2)
Join Date: Oct 2010
Location: Denver, CO.
Posts: 430
Likes: 0
Received 0 Likes
on
0 Posts
You said you did head gaskets. Are your intake manifold gaskets still good? If you are blowing by them, you could be losing a lot of power like that.
I initially though spark as well. Your dyno looks to be choppier than the previous dyno too, but you said the car runs good. If this is the case, did you gap your plugs? Are you getting spark blow out?
I initially though spark as well. Your dyno looks to be choppier than the previous dyno too, but you said the car runs good. If this is the case, did you gap your plugs? Are you getting spark blow out?
Trending Topics
#11
9 Second Club
iTrader: (10)
I run MSD wires and hate them, half the time my car has a miss after I change plugs. They are a pain in the *** to get clicked on correctly and I always use diletric grease. Pick up some firecore wires and let it rip. You may also want to check the weather station on the dyno, they can take a dump at random times and skew numbers.
#12
Did your tuner log injector duty on both sessions? Get him to compare them.
If the second session used 130+ rwhp less duty cycle, the chances are about 90% that you have a massive boost leak.
If the second session used 130+ rwhp less duty cycle, the chances are about 90% that you have a massive boost leak.
#16
Staging Lane
Join Date: Jul 2006
Location: F22 Secret Lair (aka) The "Austin Millbarge"
Posts: 53
Likes: 0
Received 0 Likes
on
0 Posts
It looks like you may possibly have some misfiring going on. Are the knock sensors connected and operational? If so the ecu could be picking up the misfires as knock and pulling timing. You really need a data log to help identify your situation.
In the mean time you may want to check the resistance of every plug wire, and if possible, fire off the plugs to ensure you're getting decent spark with the gaps you have them set at.
In the mean time you may want to check the resistance of every plug wire, and if possible, fire off the plugs to ensure you're getting decent spark with the gaps you have them set at.
#17
Thanks for all the comments guys.
I still didnt check the car I'm taking the car back to the shop next week to recheck everything..
Yes the car feels slow big time.
I'm still on the same boost 10psi we didnt run more boost after we had this problem.
We also tried the same A/F and timing like before no major change 5-8HP.
Duty cycle is the same 55-60%
Tell me about it before the turbo I dynoed the car N/A made 380rwhp so the turbo gained 60rwhp
Both runs were SAE
STD Were 598rwhp before now 460rwhp
Thanks we'll check everything soon.
I still didnt check the car I'm taking the car back to the shop next week to recheck everything..
Yes the car feels slow big time.
I'm still on the same boost 10psi we didnt run more boost after we had this problem.
We also tried the same A/F and timing like before no major change 5-8HP.
Duty cycle is the same 55-60%
Tell me about it before the turbo I dynoed the car N/A made 380rwhp so the turbo gained 60rwhp
Both runs were SAE
STD Were 598rwhp before now 460rwhp
It looks like you may possibly have some misfiring going on. Are the knock sensors connected and operational? If so the ecu could be picking up the misfires as knock and pulling timing. You really need a data log to help identify your situation.
In the mean time you may want to check the resistance of every plug wire, and if possible, fire off the plugs to ensure you're getting decent spark with the gaps you have them set at.
In the mean time you may want to check the resistance of every plug wire, and if possible, fire off the plugs to ensure you're getting decent spark with the gaps you have them set at.
Thanks we'll check everything soon.
#18
TECH Regular
iTrader: (15)
Join Date: Jun 2004
Location: Shawnee KS
Posts: 498
Likes: 0
Received 0 Likes
on
0 Posts
What plugs/Gap did you switch too? In my experience sometimes lower timing like low teens will cause a miss fire with some coil types.
How many miles sense your last dyno?
Possibly weaker valve springs with poor spark from either the MSD wires/plugs or gap/ or the valves not having enough spring pressure.
How many miles sense your last dyno?
Possibly weaker valve springs with poor spark from either the MSD wires/plugs or gap/ or the valves not having enough spring pressure.