LT4 pump = Cam with larger fuel lobe?
11-19-2015, 10:56 AM
#1
Le Mans Master
Thread Starter
LT4 pump = Cam with larger fuel lobe?
Curious if adding the LT4 pump is basically the same thing as adding a cam with a larger fuel lobe? Or is there additional value in doing with LT4 pump AND having a cam with larger fuel lobe?
Thinking about adding the LT4 pump someday, but curious if the cam I already have would just make the fuel delivery the same?
Thinking about adding the LT4 pump someday, but curious if the cam I already have would just make the fuel delivery the same?
11-19-2015, 11:42 AM
#2
Race Director
Member Since: Jul 2007
Location: Texas Hill Country
Posts: 10,763
Received 2,379 Likes
on
1,238 Posts
I would say only upgrade the parts if you need more fuel. If you have enough room with just the fuel lobe then leave it at that.
11-19-2015, 11:50 AM
#3
Le Mans Master
Thread Starter
Agreed. Where my head was.... is maybe if I did the LT4 pump and have the cam with larger lobe could I ditch the meth if I stay at a reasonable boost level. That's where my thought process is. Or possibly running flex fuel.
11-19-2015, 01:36 PM
#4
Burning Brakes
With your power, you'll definitely need the pump to support E85. On my NA build I'm running E85 and have the fuel lobe on my cam, but if I do anything else to add power I'll need to upgrade to the LT4 pump and injectors.
11-19-2015, 05:17 PM
#5
Race Director
Member Since: Jul 2007
Location: Texas Hill Country
Posts: 10,763
Received 2,379 Likes
on
1,238 Posts
Even with the LT4 pump, rails, and injectors and two tank fuel pumps I am having trouble keeping up with Ethanol.... Definitely can't run E85. It's going to be around E25, I think.
11-19-2015, 05:40 PM
#6
Le Mans Master
Thread Starter
Wow...Interesting. Are you going to run meth also Higgs? I really just don't want to ever HAVE to have meth.
Last edited by C7&7; 11-19-2015 at 05:42 PM.
11-19-2015, 06:01 PM
#7
Higgs is a larger CI motor making north of 800rwhp, so I can see his setup still having limitations on pure e85...
Plus I think Higgs is still I. The stock cam lobe??
700rwhp id say no problem with the LT4 hardware, but I have not personally done it.
I'm around 500rwho now on motor with stock cam on e67 and I plan to upgrade to the lt4 hpfp only and shoot for 650rwhp on that same fueling. Should know something before too long. About to take my NA setup back to the track then install the blower that's been sitting here for about 4 months
Plus I think Higgs is still I. The stock cam lobe??
700rwhp id say no problem with the LT4 hardware, but I have not personally done it.
I'm around 500rwho now on motor with stock cam on e67 and I plan to upgrade to the lt4 hpfp only and shoot for 650rwhp on that same fueling. Should know something before too long. About to take my NA setup back to the track then install the blower that's been sitting here for about 4 months
11-19-2015, 08:04 PM
#10
Instructor
Check out this post from Joe@CPR. He has a complete flex fuel system that I will be considering if I ever decide I want more power out of my Ti head unit.
https://www.corvetteforum.com/forums...-841-rwhp.html
https://www.corvetteforum.com/forums...-841-rwhp.html
11-19-2015, 08:38 PM
#11
Race Director
Member Since: Jul 2007
Location: Texas Hill Country
Posts: 10,763
Received 2,379 Likes
on
1,238 Posts
TA you are correct w/regard to my engine.
DD, I am running Joe's kit, essentially, it is an extra lift pump and all the hardware that integrates with DSteck's flex fuel kit. It's a great set up.
DD, I am running Joe's kit, essentially, it is an extra lift pump and all the hardware that integrates with DSteck's flex fuel kit. It's a great set up.
11-19-2015, 08:40 PM
#12
Le Mans Master
Thread Starter