LQ4 370 Direct Injection build
01-07-2014, 10:08 PM
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LQ4 370 Direct Injection build Anyone else planning on this kind of build? Wonder how long the sh%tty LS aftermarket will take to come up with a direct injection head. I wonder if the LT1’s heads will bolt to a LQ4. So far I have block and a LSA forged crank. JE has LT1 pistons but can’t find that design for 4.030 bore. Didn’t TSP get a LT1 create engine? Who am I kidding… the aftermarket can’t even come up with VVT products and that’s been out almost 10 years.
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01-08-2014, 08:22 AM
#10
The DI heads just came out within the last year in the trucks and just recently on the Vette. The aftermarket has to do R&D first on these products before they offer their own version of things.
What you see now are ported stock heads and camshafts from Comp Cams with the DI gear on them.
The first order of business for most aftermarket vendors will be to support the platforms that came with the DI engines... the Vettes, trucks, etc. That will keep them busy for a while. With enough demand in other markets, they may turn their attention to supporting Gen III and IV variants of those items... Remember, I don't believe the cams or the heads will be a straight bolt-on from everything I've seen.
I would expect it will be quite a while for the aftermarket to make LT1 aftermarket heads. It took a while for LS7 and LS3 aftermarket castings to come and in some cases, we're still waiting on LS7 heads (TFS).
What you see now are ported stock heads and camshafts from Comp Cams with the DI gear on them.
The first order of business for most aftermarket vendors will be to support the platforms that came with the DI engines... the Vettes, trucks, etc. That will keep them busy for a while. With enough demand in other markets, they may turn their attention to supporting Gen III and IV variants of those items... Remember, I don't believe the cams or the heads will be a straight bolt-on from everything I've seen.
I would expect it will be quite a while for the aftermarket to make LT1 aftermarket heads. It took a while for LS7 and LS3 aftermarket castings to come and in some cases, we're still waiting on LS7 heads (TFS).
01-08-2014, 08:44 AM
#11
Anyone else planning on this kind of build? Wonder how long the sh%tty LS aftermarket will take to come up with a direct injection head. I wonder if the LT1’s heads will bolt to a LQ4. So far I have block and a LSA forged crank. JE has LT1 pistons but can’t find that design for 4.030 bore. Didn’t TSP get a LT1 create engine? Who am I kidding… the aftermarket can’t even come up with VVT products and that’s been out almost 10 years.
The new LT1 shared something like 3 parts from the previous LS generation. Somehow I doubt there will EVER be DI heads for LS motors. There is a LOT more to it than just swapping heads.
Companies make parts for a market that wants said parts. Most aftermarket folks don't want to deal with the VVT. It's just added complexity. Other markets use it because they have to. We (the LS community) have cheaper easier alternatives due to the interchangability we are afforded.
P.S.
I smell a troll.
01-08-2014, 05:01 PM
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Here is someone who knows what's going on.
01-08-2014, 05:07 PM
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The new LT1 shared something like 3 parts from the previous LS generation. Somehow I doubt there will EVER be DI heads for LS motors. There is a LOT more to it than just swapping heads.
Companies make parts for a market that wants said parts. Most aftermarket folks don't want to deal with the VVT. It's just added complexity. Other markets use it because they have to. We (the LS community) have cheaper easier alternatives due to the interchangability we are afforded.
Companies make parts for a market that wants said parts. Most aftermarket folks don't want to deal with the VVT. It's just added complexity. Other markets use it because they have to. We (the LS community) have cheaper easier alternatives due to the interchangability we are afforded.
01-08-2014, 05:14 PM
#16
I am entirely aware that is where GM is going as a company. They have standards they must meet. What I meant by other markets have to is, they cannot easily delete it like we can. Everyone knows that DI and VVT are superior. But its currently more expensive and more complicated. And the reliability of GMs DI in v8 isn't proven.
DI will not happen on a gen 3 or 4 block with the current pump setup gm has gone with.
DI will not happen on a gen 3 or 4 block with the current pump setup gm has gone with.
01-08-2014, 05:21 PM
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I am entirely aware that is where GM is going as a company. They have standards they must meet. What I meant by other markets have to is, they cannot easily delete it like we can. Everyone knows that DI and VVT are superior. But its currently more expensive and more complicated. And the reliability of GMs DI in v8 isn't proven.
DI will not happen on a gen 3 or 4 block with the current pump setup gm has gone with.
DI will not happen on a gen 3 or 4 block with the current pump setup gm has gone with.
I can't wait to come back to this thread in six months
01-08-2014, 05:44 PM
#19
I can't wait to come back to this thread in six months
just superior intellect
01-08-2014, 05:49 PM
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For an lq4 to run DI you need the pcm the '14 trucks/vette use, vvt since it cannot be turned off, and machine the block to accept the cam with fuel pump gear on it (also the intake and exhaust valves have swapped spots). I think there's more too..
The heads should bolt on since the gen III,IV have the same bore spacing as the gen V. Just curious, why on God's green earth, would you go through all that trouble when you can get a junkyard l86 or l83 in a year or so and ditch the hassle/headache? Lol not trying to be a dick but it just doesnt seem like the gains would ever outweaigh the cost...
The heads should bolt on since the gen III,IV have the same bore spacing as the gen V. Just curious, why on God's green earth, would you go through all that trouble when you can get a junkyard l86 or l83 in a year or so and ditch the hassle/headache? Lol not trying to be a dick but it just doesnt seem like the gains would ever outweaigh the cost...