erupted

Just ordered the Magnuson Heartbeat for a 2013 GS. MTI Racing in Marietta/Atlanta is doing the install.

I noticed Magnuson suggests front subframe spacers to lift the front and get adequate hood clearance or remove the hood liner.

Has anyone left their hood liner on without the spacers? And if so, was there any rubbed spots on the liner? The hood liner is painted, so I would prefer to keep it on.

Lingenfelter sells the recommended spacers. How much time is involved in installing them?

Thanks

old motorhead

I have a 2013 GS with Heartbeat. My hoodliner is still on and we didn't use spacers. One of the screw clamps on the tube from the CAI to the throttle body rubs slightly. I think you could put the screw part underneath and I don't think it would rub at all.

Streetk14

Same here, except I did locate the clamp screw on the bottom. There are some minor rub marks from the rubber intake bellows, but it's very minor. Might be enough to damage a painted hood liner.

I personally don't like the idea of spacing the frame away from the body. I know it isn't much, but it's also going to have some affect on the suspension geometry. I'm not sure what exactly happens when you move the upper and lower control arm mounting points away from each other, but it's something to consider.

08C6

They claim stock hood fits ok...you need to take off padding... I have a aftermarket SLP hood...I had to modify a bit...

erupted

That's my dilemma....the hood liner is painted.

I think I'll go without spacers and cross that bridge later if it rubs.

Streetk14

The only place you MIGHT have an issue is on a few of the ribs of the rubber intake boot. I'll try to take a picture of where mine lightly rubs.

I'd scrap the hood liner before I installed those spacers, but I'm a function over form kind of guy.

erupted

This is wife's car, but I want to have fun to....She doesn't want the Pooh picture messed up.

Streetk14

I'm not usually a fan of those painted hood liners, but that one is pretty funny.

If it were to rub at all, it would likely only be on a section very low down on the artwork. I don't think it'll do too much damage.

0MTI RACING

If there are any spacers needed while installing the Heartbeat supercharger we can make our own in the MTI Machine CNC shop. With the standard Magnuson supercharger you still have to install cradle spacers even when using the proper hood, this will not be a problem.

erupted

Thanks MTI.... Looking forward to the install.

I do have a another question concerning the Heartbeat. It comes stock with a 96mm pulley. On this forum, Davenport Motorsports said the Heartbeat put out 6PSI on a completely stock LS3 during an install/tune.

Since I'm going with 1 7/8 headers and 3" xpipe w Cats would the slightly smaller 93mm pulley be a better choice?

Thanks

old motorhead

Streetk14 has just about your exact setup. I believe he pullied down at least one notch and maybe two. I think smaller pulleys are available in 3mm increments. He's on west coast time and is probably knee deep in a BMW about now.

erupted

Yep one step down is 93mm. I figured one step down would give just a bit more power, same reliability, and I could stick with a 6 rib pulley instead of paying extra for an 8 rib setup.

old motorhead

You can go quite a bit smaller without slip. I'm running an 81mm pulley and did have some slip. A Gatorback belt in the smallest size that would fit, fixed it. An 81mm pulley is the smallest one that will fit without cutting the snout bearing housing down some. At that point, it's time for an O/D crank pulley.

0MTI RACING

The Heartbeat kit will be ordered with the proper size pulley so not to loose any boost due to the headers.

Streetk14

Not anymore, thankfully. At least for today

I run the 90mm pulley with just a set of catted 1 7/8" headers. Even on 91 octane CA fuel, I'm still able to run a decent amount of timing. Boost is in the 7 psi range on average -- with a peak of right around 8 psi near redline.

I'm guessing the 93mm pulley will put you in the 6 psi range at sea level, but I don't see any reason not to go with at least the 90mm pulley. We have ACN 91 octane (Arizona, California, Nevada), which is known to be some of the worst in the country. If you have access to good quality 93 octane, then you'll be in better shape than me on pump gas alone.

scottg

84 mm 6 rib no problems on 2008 base model. 9 pounds boost

CI GS

Glad to see some more discussion on the Heartbeat, especially from the "old guru"
What kind of boost and HP/Tq numbers are you seeing with that setup, Rodney?

old motorhead

With about 3psi of belt slip on the top end, it made 640's at the wheels. Don't remember the tq numbers. I'm at my office and the dyno sheets are at home. Boost averages around 9.25psi. It has a 224/234 116+2 Comp LXL lobed blower cam (which I really like) and 1.875" LT headers. I have the belt slip problem solved, but haven't had it on a dyno yet to see the improvement. IAT numbers are very good and it pulls rather hard from 2500 rpm on up. Very pleased with it.

Edit: Torque checked in at a little over 600 ft/lbs at 4250 rpm. At or over 600 ft/lbs from 3750 to 4750rpm. At or over 575 from 3000 to 5750 rpm. It pulls hard whenever its asked

08C6

I'm running the 81mm pulley... 565RWHP - 535RWTQ ... I seen 10 PSI I was hitting...I have LG Motorsports header package... Borla Type S exhaust ... Kenne Bell Boost a pump...Car pulls hard - car is solid !!!

CI GS

That sounds like a good all around combo and at that HP level, it should be a lot of fun. I think we are just starting to see the true potential of this blower...
I'm glad to hear that it can work without the spacers because that didn't really appeal to me either.