[Megahurtz]

Personally, I always prefer DI over Port or DI/Port blend. Also, to note, the Goliath and LPE high side pumps require different tuning in my experience.

If you can deliver the fuel you need with DI only, you will be faster than going port. But if you get really big injectors, you have to really pay attention to the idle tuning or you will get misfires.

That said, the ATLAS port setup would be my choice if you went augmented with port.

[SOCAL.M6.ZLE]

Originally Posted by Megahurtz

Personally, I always prefer DI over Port or DI/Port blend. Also, to note, the Goliath and LPE high side pumps require different tuning in my experience.

If you can deliver the fuel you need with DI only, you will be faster than going port. But if you get really big injectors, you have to really pay attention to the idle tuning or you will get misfires.

That said, the ATLAS port setup would be my choice if you went augmented with port.

Well said Buddy, we have been missing you on the forums lately... Glad to see you back!

[CamOnlyJabroni]

I had a GenII LPE Big Bore fail in my C7Z and it started dumping fuel into the engine at idle. Replaced with a GenIII and also put a XDI belt pump on. Running 20-21psi on full pump E with +65 XDI’s at 2,600psi.

[swisstyphoon]

Originally Posted by CamOnlyJabroni

I had a GenII LPE Big Bore fail in my C7Z and it started dumping fuel into the engine at idle. Replaced with a GenIII and also put a XDI belt pump on. Running 20-21psi on full pump E with +65 XDI’s at 2,600psi.

How did you first notice the leak on yours? Were there any other signs or symptoms that tipped you off before you confirmed it? And how bad was the leak once you found it? I’m asking because my recent oil analyses showed elevated numbers, but there haven’t been any obvious issues.

I’m just trying to figure out whether my pump might be starting to seep a little, or if the elevated numbers are simply from running ethanol and the larger injection window.

[Megahurtz]

Originally Posted by SOCAL.M6.ZLE

Well said Buddy, we have been missing you on the forums lately... Glad to see you back!

I've been lurking but the forum has been kind of slow lately. I assumed too many of these cars were getting stolen or something. I still tune GM stuff all of the time, I've just been playing in the BMW world now as well. Just built a multi-map tune E50 for my G82 and this thing rips. Just did a 5.62s 60-130 draggy in the G82.

[SOCAL.M6.ZLE]

Originally Posted by Megahurtz

I've been lurking but the forum has been kind of slow lately. I assumed too many of these cars were getting stolen or something. I still tune GM stuff all of the time, I've just been playing in the BMW world now as well. Just built a multi-map tune E50 for my G82 and this thing rips. Just did a 5.62s 60-130 draggy in the G82.

That great to hear, and thats a smoking hot 60-130!

[Megahurtz]

Originally Posted by SOCAL.M6.ZLE

That great to hear, and thats a smoking hot 60-130!

lol maybe I'll post pics up later in another thread. I don't want to pull this thread off topic.

[swisstyphoon]

Has anyone heard why the Katech Goliath High-Pressure Fuel Pump disappeared from Katech's website?

It used to be listed under SKU KAT-7635, but now the product doesn’t show up anywhere on their site anymore.
Other vendors still show it, but Katech’s own listing seems completely removed.

Did Katech discontinue it, or pause production?
Does anyone know the reason? Maybe supply problems, internal issues, or something discovered during further testing?

Curious what the latest info is.

[SOCAL.M6.ZLE]

Originally Posted by swisstyphoon

Has anyone heard why the Katech Goliath High-Pressure Fuel Pump disappeared from Katech's website?

It used to be listed under SKU KAT-7635, but now the product doesn’t show up anywhere on their site anymore.
Other vendors still show it, but Katech’s own listing seems completely removed.

Did Katech discontinue it, or pause production?
Does anyone know the reason? Maybe supply problems, internal issues, or something discovered during further testing?

Curious what the latest info is.

Hey Buddy, I am going to respectfully bypass part of your question, but I will tell you that THIS GOLIATH PUMP, is the same pump... The Goliath pump was co-developed with Katech, built by Stanadyne... and now sold by XDI, myself and a few others.

Not sure if Katech will be selling them in the future, I'd let Mike chime in on that one... My guess is they will, just not sure when. I know Stanadyne has been back-ordered on the Goliath for a while...

And I only have (1) left if anyone needs one.
The other one is going on my car week after next.

[2023_ZL1-AUTO]

Not to take over, but it was mentioned above... I get the purist method, but why is it that DI only vs DI and Port combo is preferred. Sure port has more working parts, but if the end results are equal or close etc. Is it just a preference from maintenance, less parts involved and less tuning since you are only tuning the ECU with DI only vs ECU and Reflex or Atlas ? I'm just curious since I'm all in on DI and Port combo. Thanks!

[Joshinator99]

Originally Posted by 2023_ZL1-AUTO

Not to take over, but it was mentioned above... I get the purist method, but why is it that DI only vs DI and Port combo is preferred. Sure port has more working parts, but if the end results are equal or close etc. Is it just a preference from maintenance, less parts involved and less tuning since you are only tuning the ECU with DI only vs ECU and Reflex or Atlas ? I'm just curious since I'm all in on DI and Port combo. Thanks!

DI is much simpler in terms of engine bay congestion, number of parts involved, and tuning. It also makes more power than port. But…

That said, there are absolute limits to DI. I ran one of the biggest DI-only systems for years and struggled for 4 years straight to get enough fuel into the motor. It was maddening to have a $10K fuel system and still have to scale back to E50 to make things work. And, if you run a bigger than average DI system and then add port, you’re minimizing the PI vs DI power loss since you’re still doing 75% of the WOT fueling on DI. Fueling capability is now nearly unlimited by adding 1050 or even 1300 cc port injectors on top of a decent DI system. You also get some ethanol spray on the intake valves too which isn’t a bad thing.

Just my 2 cents of course. If you are staying maybe 850 WHP +/- you should be able to do that DI only and have a good time. But 1K WHP on DI is walking a tightrope that I got sick of. Your mileage may vary.

[Megahurtz]

Originally Posted by 2023_ZL1-AUTO

Not to take over, but it was mentioned above... I get the purist method, but why is it that DI only vs DI and Port combo is preferred. Sure port has more working parts, but if the end results are equal or close etc. Is it just a preference from maintenance, less parts involved and less tuning since you are only tuning the ECU with DI only vs ECU and Reflex or Atlas ? I'm just curious since I'm all in on DI and Port combo. Thanks!

If you can deliver the fuel you need for the power range you're looking for with DI alone, DI will have the advantage. DI is more resistant to knock, atomizes better in the chamber(very loose way of saying complicated things), doesn't displace incoming air like port and cools the combustion chamber better...amongst other things. Bottom line is mod vs mod, DI only will make more power than DI + port or port alone.

That said, DI only isn't always the answer. It does have its limits. It's easier to stretch power past the 1000whp mark by adding port. The additional fuel overhead that you gain can be applied to adding more power/boost, there fore technically negating the DI advantage. So my comment was that if you can make the power you want with DI only, its often the better choice, IMO, for multiple reasons. Having tuned Reflex port setups and ATLAS port setups...90% of the time the ATLAS setup is easier to tune. You can't go wrong with either setup, especially if you use the wideband closed loop option. But if I were to pick which I'd rather tune, I would pick the ATLAS since you don't have to get into revising the torque model like you would with Reflex.

[KingLT1]

^Agree

In short DI makes more power but DI is limited to around 950-1000whp on full E with the largest DI fuel parts available. So, you are left blending the E down to make more power. Port will take you as far as the Engine combination is capable of making on full E85, so the "DI makes more power" is a moot at that point. The only reason to stay DI is for simplicity and/or your power goals are modest.

[JSH]

Originally Posted by KingLT1

The only reason to stay DI is for simplicity and/or your power goals are modest.

I'm a huge fan of simplicity. I'm dynoing the car Friday morning for the second pull on this build which will be at 21.5° so versus 19 on the first pull. The way the car feels there will be significant improvement and if so, might even make a third pull and call it good. I don't know whether my horsepower goals are modest or not, but I'm at the end of the line chasing more horsepower with this build. The nhra doesn't want to see it next year.