[KingLT1]

I see BTR now offers a DOD delete cam that is stock specs but has a 32% fuel lobe for boost applications. https://briantooleyracing.com/btr-st...fuel-lobe.html

I am thinking this might be a nice sleeper upgrade along with some stock compression forged drop in pistons/rods.

The 32% fuel lobe should net another 100whp of fuel headroom.

14-15psi on E60 at stock compression should hit 800whp. Tuning is simple and no expensive valve train upgrades needed.


Thoughts?

[adamjwilson]

Looks nice with forged pistons and rods. I went with TSP pistons and rods and TSP is doing a custom grind on the cam to match the whipple.... still waiting on it! Only part that I am am waiting on for the build.

[KingLT1]

Did they give you specs in the cam?

I am still debating going with a little more cam. If I do it will likely be something mild. I like the Cam motion Titan 1 218/228 .594 .585 114. That would work with a set of .600 lift beehives and not beat the snot out of the stock valve seats. Otherwise you are sinking a lot of money into heads for longevity on these LT1's.

[Joshinator99]

Originally Posted by KingLT1

Did they give you specs in the cam?

I am still debating going with a little more cam. If I do it will likely be something mild. I like the Cam motion Titan 1 218/228 .594 .585 114. That would work with a set of .600 lift beehives and not beat the snot out of the stock valve seats. Otherwise you are sinking a lot of money into heads for longevity on these LT1's.

114 LSA will give you a pretty rough idle, no? My cam is pretty healthy (229/245, .650/.630) but the 120 LSA kept the idle reasonable.

If I had to do it again I probably would have kept the cam much closer to stock. I’m not convinced I needed a big cam to get big power.

[KingLT1]

Originally Posted by Joshinator99

114 LSA will give you a pretty rough idle, no? My cam is pretty healthy (229/245, .650/.630) but the 120 LSA kept the idle reasonable.

If I had to do it again I probably would have kept the cam much closer to stock. I’m not convinced I needed a big cam to get big power.

I am pretty sure overlap plays the biggest factor in the sound of the cam. Your 229/245 120 has -3 degrees of overlap. That Cam motion 218/228 114 has -5 degrees. So, it would idle even smoother...but the power is likely going to peak at a lower RPM. Your cam probably peaks around 7k where the Titan 1 peaks around 6400. The Titan 1 probably offers better tip in throttle and part throttle response out of boost. Wide LSA cams seem to be soggier down low as they trade low speed throttle response for a wider power range with a higher peak.

I wouldn't mind a mild lope, but I don't want anything choppy that needs 800+ rpm to idle.

I agree that we don't need much cam at all to make great power with boost. I have also never been a fan of the big lift cams that require heavy dual springs for stock heads. You have a killer set of heads on your car so it's no big deal.

Side note I also just seen GPI has some low lift L86 cams that drop in and work with stock valve springs that also include a +32 % fuel lobe. The stage 1 21x/23x .54x .54x 114+8 would be a middle ground between the BTR big fuel and Titan 1.

Basically, I am at my fuel system and bottom end limits (or at least what I consider limits) ...I also don't want this to turn into a 20k ordeal. So, a cam that will drop in and work with the stock heads but offer more fuel headroom so I can turn the boost up seems like the logical choice.

[laynlo15]

Originally Posted by adamjwilson

Looks nice with forged pistons and rods. I went with TSP pistons and rods and TSP is doing a custom grind on the cam to match the whipple.... still waiting on it! Only part that I am am waiting on for the build.

How are they coming along on your build?

[Joshinator99]

Originally Posted by KingLT1

I am pretty sure overlap plays the biggest factor in the sound of the cam. Your 229/245 120 has -3 degrees of overlap. That Cam motion 218/228 114 has -5 degrees. So, it would idle even smoother...but the power is likely going to peak at a lower RPM. Your cam probably peaks around 7k where the Titan 1 peaks around 6400. The Titan 1 probably offers better tip in throttle and part throttle response out of boost. Wide LSA cams seem to be soggier down low as they trade low speed throttle response for a wider power range with a higher peak.

I wouldn't mind a mild lope, but I don't want anything choppy that needs 800+ rpm to idle.

I agree that we don't need much cam at all to make great power with boost. I have also never been a fan of the big lift cams that require heavy dual springs for stock heads. You have a killer set of heads on your car so it's no big deal.

Side note I also just seen GPI has some low lift L86 cams that drop in and work with stock valve springs that also include a +32 % fuel lobe. The stage 1 21x/23x .54x .54x 114+8 would be a middle ground between the BTR big fuel and Titan 1.

Basically, I am at my fuel system and bottom end limits (or at least what I consider limits) ...I also don't want this to turn into a 20k ordeal. So, a cam that will drop in and work with the stock heads but offer more fuel headroom so I can turn the boost up seems like the logical choice.

Great info as always!

[ZL14ever]

Call me crazy, but I am thinking of having Cam Motion custom build me an LS9 spec cam for my LT4 (211/230 0.590"/0.585" 122.5 LSA) with the 32% fuel lobe. Should idle at the stock rpm and add ~25 rwhp over LT4 cam

[KingLT1]

Originally Posted by ZL14ever

Call me crazy, but I am thinking of having Cam Motion custom build me an LS9 spec cam for my LT4 (211/230 0.590"/0.585" 122.5 LSA) with the 32% fuel lobe. Should idle at the stock rpm and add ~25 rwhp over LT4 cam

I like that.

BTR has a cam close to that.

https://briantooleyracing.com/btr-ge...onverters.html

[JSH]

Originally Posted by KingLT1

I like that.

BTR has a cam close to that.

https://briantooleyracing.com/btr-ge...onverters.html

BTR have a 38% cam for mine? I recall that you once liked LPE's cam for my motor, but it might not have been this version.

[adamjwilson]

Originally Posted by laynlo15

How are they coming along on your build?

Most of the parts are in… Whipple, Meth kit, LT4 fueling, DSX aux kit, TSP rods and pistons, rotofab CAI. Waiting on cam from TSP. Not sure on the grind as we discussed a custom grind cam to match the whipple. Got a call into them for specs. Was hoping to have build done by the end of the year but looks like January now with the speed shop. Discussed tuning with E with them and use of Meth on occassion. Car is a garage queen until spring so no worries, but I have paid alot of $$ out so need to see some progress soon! Just waiting on a cam now to start…..

[KingLT1]

Originally Posted by JSH

BTR have a 38% cam for mine? I recall that you once liked LPE's cam for my motor, but it might not have been this version.

I have never really "liked" lingenfelter cams. They were for a while the only company that had a 42% lobe to maximize their Big Bore HPFP. BRC now offers some 43% lobes for the Big bore. If you only have a LT4 pump then 38% is the biggest lobe you can run. BTR offers some 38% lobe.


Imo, You need to build the bottom end and address the stock thrust bearing before changing anything. I would actually put the 3.0 pulley back on.

[Smokin19]

Here is my BTR stg II cam with the .660 lift and 38% fuel lobe. It idles at stock rpm.
https://youtu.be/5-SbXrhN8nU

[JSH]

Originally Posted by Smokin19

Here is my BTR stg II cam with the .660 lift and 38% fuel lobe. It idles at stock rpm.
https://youtu.be/5-SbXrhN8nU

The rhythm of the idle is much like mine. The problem is, like other vendors, Hennessey won't tell me the specs of my cam. To be 100% sure, we would have to pull and mic it, then order a new one. Or I could call a few vendors to see if they have any knowledge of HPE's cam specs.