Late Model Racecraft LFX Heads/ Cams R&D

[Tavo32]

Updates?

[Crazyhorse6901]

Subscribed

[Jenner]

Seems interesting.. will this change sound like on the LS3?? I know it won't sound like a v8, but I'm curious?

[Ryan87mets]

[13lstuner]

Come on any updates??

[etmx183]

I have Stock LFX exhaust downpipes W/cats ( only 4,000 on the exhaust ) if you need them to do a test let me know.

Originally Posted by RacnJsn95

A thought popped into my head today... You guys mentioned that LLT porting had already been achieved. Probably a long time ago I imagine... Since you guys have an LFX long block, I'm wondering if you possibly have an LLT head laying around?

It would be really nice to see the LLT vs LFX exhaust port on a flow bench (may need an LLT ex manifold, and a portion of the LFX ex pipe to get a good comparison though?), it would be nice to see how the single outlet of the LFX head flows in comparison to the individual ports of the LLT to see if the LFX is really losing out on not having the ability to add headers. Maybe it would quite the people that complain about the lack of header option on the LFX if they saw that it out performs the LLT set up (if it even does)...

[stevey_frac]

I'm getting the sneaking suspicion, that the tune for this might be vaporware.

[sprint17]

^agree

[GretchenGotGrowl]

Originally Posted by stevey_frac

I'm getting the sneaking suspicion, that the tune for this might be vaporware.

Originally Posted by sprint17

^agree

Tuning should not be a problem. Both HP Tuners and EFI Live have cracked the ECU used with the LFX.

[speedmon]

Originally Posted by stevey_frac

I'm getting the sneaking suspicion, that the tune for this might be vaporware.

The tune would just a be a custom map designed to accomodate the new head specs. Thats not the hard part......

The tough part would be engineering new valves and cams to increase power. Then you have to find off the shelf parts or someone to manufacture those parts in low qtys and still keep the cost down.

Although the exhaust ports seem to be optimized (close to max size within their space)......their does seem to be room for larger intake valves that could deliver more air and fuel to the chamber, which would mean more power.

A good comparison of potential power would be the Porsche 3.6 engine which in the standard 2008 911 delivered 325 HP (sound familiar?). However the 3.6 in GT3, the performance version of the 911, had 415 HP with the same displacement. Different valves, cams and fuel map.

So practically, numbers around 400hp are entirely possible by just just changing the heads and cams.

Nice cheap power through GM, cuz the 3.6 long block is about $4k whereas the Porsche motor is closer to $15K.

[KMPrenger]

Originally Posted by GretchenGotGrowl

Tuning should not be a problem. Both HP Tuners and EFI Live have cracked the ECU used with the LFX.

Yep...tuning shouldn't be a big problem. As long as the profile of the new cams is good, then the tune should follow along just fine.

Just wish we'd be hearing more about this sooner.

[speedmon]

If I wanted to short cut the design time of the new heads/valves/cam changes (design is always the longest phase), I would just take the specs from the 415HP GT3 and see how much I could integrate into the GM 3.6L.

Its easier to copy than it is to create.

BTW...the specs would work with either the LFX or the previous design.... 3.6=3.6.

[stevey_frac]

Originally Posted by GretchenGotGrowl

Tuning should not be a problem. Both HP Tuners and EFI Live have cracked the ECU used with the LFX.

Sorry, forgot I had strayed over into the LFX side of the V6 forums.

I meant this with respect to the LLT.

[J_Vibe92]

It doesnt just work like that.