Spark plug options
Thread Starter
Burning Brakes
Joined: Aug 2011
Posts: 810
Likes: 188
From: andover mn
Spark plug options
2008 ls3 Maggie Heartbeat 514 rwhp 470rwtq.6sp manual. Will be putting ARH 1 7/8 and 3 inch all the way back to stock mufflers npp. Question is what spark plugs do you use with my set up. Looking for 540rwhp when done. ngk6 maybe?
Le Mans Master
Joined: Dec 2005
Posts: 6,996
Likes: 1,681
From: Southeast TX
Those or the ZR1 plugs will work fine at mild boost. With the headers, are you going to pulley down to get your boost back?
Thread Starter
Burning Brakes
Joined: Aug 2011
Posts: 810
Likes: 188
From: andover mn
Thread Starter
Burning Brakes
Joined: Aug 2011
Posts: 810
Likes: 188
From: andover mn
Racer
Joined: Jan 2014
Posts: 349
Likes: 6
Id have to find you the links i read last night because id probably get something wrong trying to say it back lol, but what sold me was that the plug comes with a smaller gap already with a smaller ground strap, instead of trying to rainbow in the tr6 for a smaller gap.
Thread Starter
Burning Brakes
Joined: Aug 2011
Posts: 810
Likes: 188
From: andover mn
Id have to find you the links i read last night because id probably get something wrong trying to say it back lol, but what sold me was that the plug comes with a smaller gap already with a smaller ground strap, instead of trying to rainbow in the tr6 for a smaller gap.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
Melting Slicks
Joined: Mar 2007
Posts: 2,391
Likes: 23
From: Santa Barbara CA
For plugs I'd run the OEM ZR1 iridium plugs. You're right in stock ZR1 power range and I think there are some reasons to stick with an OEM style plug. Low maintenance is one.
At your power level, I wouldn't do a "7" range plug, but that's just me.
Le Mans Master
Joined: Dec 2005
Posts: 6,996
Likes: 1,681
From: Southeast TX
Magnuson has a ton of pulley choices for the Heartbeat now. 105mm-81mm in 3mm intervals. If you're going to have it re-tuned, you might as well pulley it down to get the boost back to where it was.
For plugs I'd run the OEM ZR1 iridium plugs. You're right in stock ZR1 power range and I think there are some reasons to stick with an OEM style plug. Low maintenance is one.
At your power level, I wouldn't do a "7" range plug, but that's just me.
For plugs I'd run the OEM ZR1 iridium plugs. You're right in stock ZR1 power range and I think there are some reasons to stick with an OEM style plug. Low maintenance is one.
At your power level, I wouldn't do a "7" range plug, but that's just me.
If you're going to need a tune tweak anyway, get you an 87mm pulley and enjoy the power. Boost should be around 9 to 9.5 psi with the long tubes. With a good tune and plenty of fuel, you won't have motor troubles. 580ish rwhp and a permagrin is easily done
Thread Starter
Burning Brakes
Joined: Aug 2011
Posts: 810
Likes: 188
From: andover mn
Yep, you can go overkill with the "cool" plugs. That can get you less than perfect manners for no reason. I've had less than perfect results with the tr6 plugs too. At mild boost levels, use the ZR1 plugs.
If you're going to need a tune tweak anyway, get you an 87mm pulley and enjoy the power. Boost should be around 9 to 9.5 psi with the long tubes. With a good tune and plenty of fuel, you won't have motor troubles. 580ish rwhp and a permagrin is easily done
If you're going to need a tune tweak anyway, get you an 87mm pulley and enjoy the power. Boost should be around 9 to 9.5 psi with the long tubes. With a good tune and plenty of fuel, you won't have motor troubles. 580ish rwhp and a permagrin is easily done
Tuner said if I pulley down I"d have to go with new injectors and z06 pump. 2000 and since its in already it would save $450 for a tune later .don"t have the extra $2000 for that now. Will look at stock zr1 plugs, should work good in my car.
Melting Slicks
Joined: Mar 2007
Posts: 2,391
Likes: 23
From: Santa Barbara CA
I could be wrong, but the LS9 injectors that come with the Heartbeat should be enough for a bit more power. I'd think they would be good for at least 600 whp. I guess I'll find out soon enough here as I plan to push mine fairly hard.
Fuel supply on the other hand may be an issue. You'll at least need a boost-a-pump if you don't have one. A Z06 pump would be the other way to go.
Thread Starter
Burning Brakes
Joined: Aug 2011
Posts: 810
Likes: 188
From: andover mn
I could be wrong, but the LS9 injectors that come with the Heartbeat should be enough for a bit more power. I'd think they would be good for at least 600 whp. I guess I'll find out soon enough here as I plan to push mine fairly hard.
Fuel supply on the other hand may be an issue. You'll at least need a boost-a-pump if you don't have one. A Z06 pump would be the other way to go.
Fuel supply on the other hand may be an issue. You'll at least need a boost-a-pump if you don't have one. A Z06 pump would be the other way to go.
Melting Slicks
Joined: Mar 2007
Posts: 2,391
Likes: 23
From: Santa Barbara CA
You know I never asked how big the injectors were that came with the Heartbeat. but the big cost is the zo6 fuel pump. And I read enough threads on fuel pump installs to know its over my head. The question I will ask magnuson is how far down can I go without fuel pump or just how big are the stock kit injectors in the ls3 kit?
The most popular FI kits for the C6 (ECS and A&A come to mind) come with a boost-a-pump to supply the extra fuel. Some people may not like the BAPs, but I've found them very reliable if installed properly.
I'm actually surprised that Magnuson is selling this system without any kind of fuel pump upgrade. I'd be curious to see what your fuel pressure looks like right now on a WOT pull.
Thread Starter
Burning Brakes
Joined: Aug 2011
Posts: 810
Likes: 188
From: andover mn
The Heartbeat blower comes with OEM ZR1/LS9 injectors. Some of the ZR1 guys are claiming they're good up to 700 whp, but the ZR1 has higher fuel pressure that probably helps with that. Still, I don't think 600-625 whp would be an issue with those injectors.
The most popular FI kits for the C6 (ECS and A&A come to mind) come with a boost-a-pump to supply the extra fuel. Some people may not like the BAPs, but I've found them very reliable if installed properly.
I'm actually surprised that Magnuson is selling this system without any kind of fuel pump upgrade. I'd be curious to see what your fuel pressure looks like right now on a WOT pull.
The most popular FI kits for the C6 (ECS and A&A come to mind) come with a boost-a-pump to supply the extra fuel. Some people may not like the BAPs, but I've found them very reliable if installed properly.
I'm actually surprised that Magnuson is selling this system without any kind of fuel pump upgrade. I'd be curious to see what your fuel pressure looks like right now on a WOT pull.
Last edited by scottg; Mar 30, 2014 at 05:55 PM. Reason: forgot car
Melting Slicks
Joined: Mar 2007
Posts: 2,391
Likes: 23
From: Santa Barbara CA
Magnuson has always supplied a fuel pump booster with their older kits, which is why I think it's strange that they don't with this one. I'd think it would definitely be needed if making any more power than you are right now. Even adding headers could push it over the edge.
I have an extra Kenne Bell BAP sitting here if you want it for a good price. The wiring is all done and it's set up to be used with a Racetronix harness (http://www.racetronix.biz/itemdesc.a...%2D008&eq=&Tp=), which is the only way to go. I took the BAP off my '08 when I had it to upgrade to the 20 volt "competition" version. I actually forgot I even had it or I would have used it on my new GS build. It'll give you the headroom you need for more power and is a much easier install than a fuel pump upgrade.