[Dennis 2ss]

Originally Posted by EDFHOBBIES

I'm using the GT31 with the edelbrock 2650 910 on 93 and 1044 on E with port injection. pretty smooth idle of course the tuner can play with it to idle more or less chop to some degree.

I didn't have a good enough low side or the 42% lobe I made 887 on E with using LPE Big bore pump, GT31, and FIC injectors.


Me personally I would use the plus 65 and pay the 2k more. You did the right thing on the low side, the pump, might as well get the best injectors.
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I'd probably msg Ryne Cunningham he seems to be using these fuel parts the most and his own 43% cam lobe.

Those are great results! I’ll stick with this for next year and see how i’ll do. 65s will definitely be the next step if i feel i can handle this setup. I chose the Fore lowside after reading your comment on another thread. Thanks for the advices especially from you and King! And many other on here

[JANNETTYRACING]

Originally Posted by Joshinator99

I think CamMotion is doing the +43% fuel lobe now too FWIW.

Is it 43% over an LT1 or LT4 lobe.

[EDFHOBBIES]

Originally Posted by JANNETTYRACING

Is it 43% over an LT1 or LT4 lobe.

Stock LT1 fuel pump lobe size 5.70 MM
Stock LT4 fuel pump lobe size 6.00 MM
32% Fuel Lobe 6.5 MM
38% Fuel Lobe 7.85 MM
42% Fuel Lobe 8.2 MM (LPE Big Bore Pump only)
43% Fuel Lobe ? mm not sure exact mm. Rynne Cunningham or Cammotions

[Joshinator99]

Originally Posted by JANNETTYRACING

Is it 43% over an LT1 or LT4 lobe.

I’m assuming LT1 since the LPE Big Bore HPFP is the only high side pump capable of running the +42% & +43% fuel pump lobes and the LPE BB HPFP is made from new, over-bored, LT1 fuel pumps, not LT4s.

The LT4 is capped at +38% I believe.

[JANNETTYRACING]

Originally Posted by EDFHOBBIES

Stock LT1 fuel pump lobe size 5.70 MM
Stock LT4 fuel pump lobe size 6.00 MM
32% Fuel Lobe 6.5 MM
38% Fuel Lobe 7.85 MM
42% Fuel Lobe 8.2 MM (LPE Big Bore Pump only)
43% Fuel Lobe ? mm not sure exact mm. Rynne Cunningham or Cammotions

All to often in the aftermarket different manufacturers do not resort to a standard that is why you have to ask these questions.

If based on the LT1 5.70 mm lobe lift
32% 7.524 mm
38% 7.866 mm
42% 8.094 mm
43% 8.151 mm

There is a limit to how much you can stroke the HPFP and still see gains.

Also the higher stroke means less pump life and possible pressure control issues, so we have to be careful.

For now I choose to stick to 32% for good gains with ultimate in reliability.

At least until we see good solid reliable data that the 38% is worth the risk.

Ted.

[KingLT1]

The 42-43% lobe is designed for the gen 2 LPE big bore pump which is based off a LT1 pump design. A 32% lobe limits the LPE pumps capability. I believe the LT1 pump can be stroked further then a LT4 hence why I also believe LPE designed the LPE big bore pump off the LT1. There shouldn't be any pressure issues if the tuning is correct for the fuel pump lobe.

[EDFHOBBIES]

Originally Posted by JANNETTYRACING

All to often in the aftermarket different manufacturers do not resort to a standard that is why you have to ask these questions.

If based on the LT1 5.70 mm lobe lift
32% 7.524 mm
38% 7.866 mm
42% 8.094 mm
43% 8.151 mm

There is a limit to how much you can stroke the HPFP and still see gains.

Also the higher stroke means less pump life and possible pressure control issues, so we have to be careful.

For now I choose to stick to 32% for good gains with ultimate in reliability.

At least until we see good solid reliable data that the 38% is worth the risk.

Ted.

I can see this. With fuel systems there is no playing around. I have my low side and high side warnings ⚠️ on my banks. For me it easy to pull the blower and swap out a pump or injector. If I did see something screwy I guess I could have Matt turn up the port system to compensate.

I'm running a 38% on a lt4 pump and it's spaced correctly with shims per lpe instructions and Matt's mechanic measuring.

[JANNETTYRACING]

Originally Posted by EDFHOBBIES

I can see this. With fuel systems there is no playing around. I have my low side and high side warnings ⚠️ on my banks. For me it easy to pull the blower and swap out a pump or injector. If I did see something screwy I guess I could have Matt turn up the port system to compensate.

I'm running a 38% on a lt4 pump and it's spaced correctly with shims per lpe instructions and Matt's mechanic measuring.

Any chance you can quantify the fuel flow difference from 32 to 38% lobe

Keep in mind not everyone is as mechanically inclined as you are, most of my customers don't want to do there own oil changes.

Ted.

[EDFHOBBIES]

Originally Posted by JANNETTYRACING

Any chance you can quantify the fuel flow difference from 32 to 38% lobe

Keep in mind not everyone is as mechanically inclined as you are, most of my customers don't want to do there own oil changes.

Ted.

I wish I could I wish I could supply some proof that its worth the risk and it that it added x amount of power. I just asked matt to look at the high side pressures from 2019 vs an hour ago to see if the pumps had any deterioration (cars at matts now) he says the fuel pressure is still the same no declines.

[JANNETTYRACING]

Originally Posted by EDFHOBBIES

I wish I could I wish I could supply some proof that its worth the risk and it that it added x amount of power. I just asked matt to look at the high side pressures from 2019 vs an hour ago to see if the pumps had any deterioration (cars at matts now) he says the fuel pressure is still the same no declines.

Look at the pump duration rather than the pressure.

[EDFHOBBIES]

Originally Posted by JANNETTYRACING

Look at the pump duration rather than the pressure.

Nothing has changed over time in duration on the suction side or pressure side the solenoid is not having to open or close any different with timing to make up for failing pump all seems as it was in 2019. I could be having success because my shop measured vs slapping the pump on the lobe and calling it good. I do, do a lot stuff myself in my garage as you say lol When I work on my car its at work I would say other than a dyno, hp tuner stuff, a real scanner I'm equipped as well as you if not better since I also service diesel equipment with more sophisticated emissions stuff then these gas engines.

[Dennis 2ss]

Finally got the car tuned and dialed. 865 whp and 743 lb ft on e70 and the car pulls like a train. Super happy with how the car turned out. Now the aim is 170+ MPH on the 1/2 mile which i do believe is possible.

[EDFHOBBIES]

Originally Posted by Dennis 2ss

Finally got the car tuned and dialed. 865 whp and 743 lb ft on e70 and the car pulls like a train. Super happy with how the car turned out. Now the aim is 170+ MPH on the 1/2 mile which i do believe is possible.

Lpe cams are under rated I think I made more than most with my 2650 and your numbers sound pretty good.

[Joshinator99]

Originally Posted by Dennis 2ss

Finally got the car tuned and dialed. 865 whp and 743 lb ft on e70 and the car pulls like a train. Super happy with how the car turned out. Now the aim is 170+ MPH on the 1/2 mile which i do believe is possible.

Nice numbers Dennis! Should rock and roll!