Best plugs for LS7 on 91 octane? Plug gap? 91/e85 mix change plugs?
#1
Best plugs for LS7 on 91 octane? Plug gap? 91/e85 mix change plugs?
I tried running NGK TR55's before and it felt good... and then stepped up to TR6's and I couldn't really feel a difference after a buddy said that is what I should run. I feel like it should be making MORE power. I ran them as they were gapped out of the box.
What do you guys run with LS7 heads? What plug gap?
My setup:
11.25:1 compression on 91 octane
QM600 cam 243/256 .650" lift approx
WCCH ported heads, ported LS7 intake, 90mm TB
1 7/8" long tubes (non equal length), dual 3" into single 3.5" exhaust
I've never dynoed it. Running Holley HP efi. 26* timing up top I believe.
If I run a 91/e85 blend (e30 approx) should I change plugs?
I ran this before and added 3* timing and it felt very strong.
What do you guys run with LS7 heads? What plug gap?
My setup:
11.25:1 compression on 91 octane
QM600 cam 243/256 .650" lift approx
WCCH ported heads, ported LS7 intake, 90mm TB
1 7/8" long tubes (non equal length), dual 3" into single 3.5" exhaust
I've never dynoed it. Running Holley HP efi. 26* timing up top I believe.
If I run a 91/e85 blend (e30 approx) should I change plugs?
I ran this before and added 3* timing and it felt very strong.
#3
I'm running an earlier version of the same cam, decked heads, ported tb and intake, AR headers. With TR6's @.040" I dyno'd 572 sae with 24 degrees of timing. These heads are very efficient and don't want/need a lot of timing. We gave it up to 28 degrees but it didn't make any more power, so we left it at 24. Now, with a 100 shot I'm running Br7's @ .034" and making 682 SAE rwhp.
I think you'll be fine with the TR6'.
I think you'll be fine with the TR6'.
#4
9 Second Club
iTrader: (33)
I'm running an earlier version of the same cam, decked heads, ported tb and intake, AR headers. With TR6's @.040" I dyno'd 572 sae with 24 degrees of timing. These heads are very efficient and don't want/need a lot of timing. We gave it up to 28 degrees but it didn't make any more power, so we left it at 24. Now, with a 100 shot I'm running Br7's @ .034" and making 682 SAE rwhp.
I think you'll be fine with the TR6'.
I think you'll be fine with the TR6'.
#5
Banned
iTrader: (2)
I tried running NGK TR55's before and it felt good... and then stepped up to TR6's and I couldn't really feel a difference after a buddy said that is what I should run. I feel like it should be making MORE power. I ran them as they were gapped out of the box.
What do you guys run with LS7 heads? What plug gap?
My setup:
11.25:1 compression on 91 octane
QM600 cam 243/256 .650" lift approx
WCCH ported heads, ported LS7 intake, 90mm TB
1 7/8" long tubes (non equal length), dual 3" into single 3.5" exhaust
I've never dynoed it. Running Holley HP efi. 26* timing up top I believe.
If I run a 91/e85 blend (e30 approx) should I change plugs?
I ran this before and added 3* timing and it felt very strong.
What do you guys run with LS7 heads? What plug gap?
My setup:
11.25:1 compression on 91 octane
QM600 cam 243/256 .650" lift approx
WCCH ported heads, ported LS7 intake, 90mm TB
1 7/8" long tubes (non equal length), dual 3" into single 3.5" exhaust
I've never dynoed it. Running Holley HP efi. 26* timing up top I believe.
If I run a 91/e85 blend (e30 approx) should I change plugs?
I ran this before and added 3* timing and it felt very strong.
You should use TR55 plugs gapped at .050
That's the best plug and gap for any LSx engine that is a mild normal daily driver engine like yours.
And never install spark plugs that you yourself do not check for proper gap with a gap tool before you install them. Using them out of the box isn't a good idea....you have to check them all to make sure they are all the same gap and the proper gap.
.
#6
LS1Tech Sponsor
YIKES!
There is no way I would run a 55 in that application. I would run absolutely at least a 6 or even side on a 7.
Here is a really good write up on how to read plugs and decide what your engine is actually in need of.
http://www.pcmofnc.com/index.php/blo...ad-spark-plugs
Typically E85 will take a warmer plug. TO give you an example we have a car that made 900+rwhp on 113 and it took a 9. With E85 it barely has any heat with a 8 at 1000 rwhp.
There is no way I would run a 55 in that application. I would run absolutely at least a 6 or even side on a 7.
Here is a really good write up on how to read plugs and decide what your engine is actually in need of.
http://www.pcmofnc.com/index.php/blo...ad-spark-plugs
Typically E85 will take a warmer plug. TO give you an example we have a car that made 900+rwhp on 113 and it took a 9. With E85 it barely has any heat with a 8 at 1000 rwhp.
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#7
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#11
9 Second Club
iTrader: (33)
YIKES!
There is no way I would run a 55 in that application. I would run absolutely at least a 6 or even side on a 7.
Here is a really good write up on how to read plugs and decide what your engine is actually in need of.
http://www.pcmofnc.com/index.php/blo...ad-spark-plugs
Typically E85 will take a warmer plug. TO give you an example we have a car that made 900+rwhp on 113 and it took a 9. With E85 it barely has any heat with a 8 at 1000 rwhp.
There is no way I would run a 55 in that application. I would run absolutely at least a 6 or even side on a 7.
Here is a really good write up on how to read plugs and decide what your engine is actually in need of.
http://www.pcmofnc.com/index.php/blo...ad-spark-plugs
Typically E85 will take a warmer plug. TO give you an example we have a car that made 900+rwhp on 113 and it took a 9. With E85 it barely has any heat with a 8 at 1000 rwhp.