[RexB92]

Hello everyone, I currently have a 416 LT1 with a F1A-94 procharger that made right at 700RWHP on about 14lbs of boost. I have the MAMO MSD, nick Williams 103. My current fuel system is the LT4 System and injectors with a DSX low side pump.. my motor is currently shot and rebuilding it here soon at the shop. I was wondering I could only run E40 max on that old set up. My old cam was a custom cam with these specs.

.603 .594 214 228 118+4 32% overdrive

If I went with a bigger cam and got a 40% or 38% fuel lobe do you think i would be enough to get to the full E85 mark with that? Or do you think the power I would pick up with a bigger cam I could then run less boost and make it there? Just can’t justify getting the XDI injectors and fuel pump for 6k just to run full E and only be able to run up to 800 RWHP.. And I DO NOT want to add meth injecton.. any input would be great thanks!!

[Joshinator99]

Originally Posted by RexB92

Hello everyone, I currently have a 416 LT1 with a F1A-94 procharger that made right at 700RWHP on about 14lbs of boost. I have the MAMO MSD, nick Williams 103. My current fuel system is the LT4 System and injectors with a DSX low side pump.. my motor is currently shot and rebuilding it here soon at the shop. I was wondering I could only run E40 max on that old set up. My old cam was a custom cam with these specs.

.603 .594 214 228 118+4 32% overdrive

If I went with a bigger cam and got a 40% or 38% fuel lobe do you think i would be enough to get to the full E85 mark with that? Or do you think the power I would pick up with a bigger cam I could then run less boost and make it there? Just can’t justify getting the XDI injectors and fuel pump for 6k just to run full E and only be able to run up to 800 RWHP.. And I DO NOT want to add meth injecton.. any input would be great thanks!!

Car should be making a lot more power than 700 WHP in my opinion. I’d reach out to CamMotion and have them spec a cam for exactly what you want to do with your build.

Read some of KingLT1’s posts on this board about fuel system sizing. You don’t need to run full E to make big power, E50-E60 will get it done with a significantly lower strain on the fuel system. There’s a crap ton of great info on sizes of pumps & injectors and what they will support for power at different E ratings. But you’re going to have to make an investment in the fuel system if you want to make big power. Either:
1. Port injection
2. XDI setup
3. LPE BB HPFP and +52% injectors

[RexB92]

I agree it should be making more power but I think it’s because the motor was built for 30lbs of boost and there was a shit ton of blow by and it just wasn’t efficient.. I had a valve drop and destroy the block.. so I am now going with the Frankenstein head package so I should pick up some power there also.. just weighing out different options

[Nilly Welson]

Originally Posted by RexB92

I agree it should be making more power but I think it’s because the motor was built for 30lbs of boost and there was a shit ton of blow by and it just wasn’t efficient.. I had a valve drop and destroy the block.. so I am now going with the Frankenstein head package so I should pick up some power there also.. just weighing out different options

What caused the Valve to fail? The valves should handle that power with no problem is what I'm thinking.

[KingLT1]

Originally Posted by Nilly Welson

What caused the Valve to fail? The valves should handle that power with no problem is what I'm thinking.

The factory valve seats/guides in LT1 heads are prone to failure when you run a aftermarket cam and heavier valve springs. If one plans on using stock castings then it would be wise to have the seats/guides reworked. Plenty of info out there supporting this. TSP has a disclaimer right on there website about it.

[cmitchell17]

Originally Posted by RexB92

I agree it should be making more power but I think it’s because the motor was built for 30lbs of boost and there was a shit ton of blow by and it just wasn’t efficient.. I had a valve drop and destroy the block.. so I am now going with the Frankenstein head package so I should pick up some power there also.. just weighing out different options

Did your valve seats, particularly intake, break apart? When I think "dropped valve" I only thing a broken spring leading to a "dropped" valve?

[RexB92]

Originally Posted by KingLT1

The factory valve seats/guides in LT1 heads are prone to failure when you run a aftermarket cam and heavier valve springs. If one plans on using stock castings then it would be wise to have the seats/guides reworked. Plenty of info out there supporting this. TSP has a disclaimer right on there website about it.

Yes, will be getting them reworked by Frankenstein

[RexB92]

Originally Posted by cmitchell17

Did your valve seats, particularly intake, break apart? When I think "dropped valve" I only thing a broken spring leading to a "dropped" valve?

Yes the valve seat broke leading to the valve dropping on top of the piston and boom

[MP3BOOSTED]

so i have a custom boost cam by pray, its bigger then his stage 2 he offers. On 93 i made right at 800, i went 50 percent 93 and 50 percent e85 and make a good amount more then 800. again this is now with meth but i feel like you definitely should of made more then 700, i'm making over 800 on 12 or 13 pounds. i would consider meth, helps a ton, just my 2 cents.

[oldman]

Originally Posted by Joshinator99

Car should be making a lot more power than 700 WHP in my opinion. I’d reach out to CamMotion and have them spec a cam for exactly what you want to do with your build.

word. Also IMO, you need a zl1 pump, and an external low pressure pump too. I like the LingenP high pressure pump and LT4 injectors for 700 HP.

There is no E85 in Hawaii so I really don't need the LingenP injectors.

If I new I would end up in a farm in Hawaii with no E85, I probably would have done an 8 injector meth route. ie dual inject.

[oldman]

Originally Posted by cmitchell17

Did your valve seats, particularly intake, break apart? When I think "dropped valve" I only thing a broken spring leading to a "dropped" valve?

IMO, the valve seat issue is partially caused by cams with too steep of a ramp vs lift.

[BlaqWhole]

I see you're in Nebraska. Who out here does your tuning?

[oldman]

Originally Posted by Joshinator99

Car should be making a lot more power than 700 WHP in my opinion. I’d reach out to CamMotion and have them spec a cam for exactly what you want to do with your build.

Read some of KingLT1’s posts on this board about fuel system sizing. You don’t need to run full E to make big power, E50-E60 will get it done with a significantly lower strain on the fuel system. There’s a crap ton of great info on sizes of pumps & injectors and what they will support for power at different E ratings. But you’re going to have to make an investment in the fuel system if you want to make big power. Either:
1. Port injection
2. XDI setup
3. LPE BB HPFP and +52% injectors

I did 3 but tossed around 1 for a while. I'm in Hawaii now so there is no E85. I am thinking of 8 point meth, Weapon X SPI but I don't know if that can do meth / water. Snow can for sure. Long story short 1 or 3 is great if you can get E85, but now that I can't, I'm thinking meth.

To the OP, 6K for fuel system is in my opinion built into the cost. You gotta pay to play. I felt the 6K plus I put into the fuel system was well spent, just like the 600 bucks to put real valves into the head and I'm at 7 to 12 PSI depending on fuel and exhaust. Currently I'm at 6 PSI on a 4" pully stock headers and custom cats and 3 total mufflers.