[19 2SS]

Originally Posted by JANNETTYRACING

I do like our 95mm conversion kit moving from the 87mm on any 6th gen N/A or SC so Yes.

The big gulp will net you nothing at this power level.

I am sure there is more to be had in the tuning Your combo should easily make 600-625 RWHP on 93 octane

Ted.

When you say the big gulp will net me nothing, are you aware that im currently running the stock intake, not even a standard rotofab?

I talked to the guys at CSP yesterday who did my car, and they said that I was at the end of my fuel system when the car made 557whp, is that even possible?

[wnta1ss]

Originally Posted by 19 2SS

I talked to the guys at CSP yesterday who did my car, and they said that I was at the end of my fuel system when the car made 557whp, is that even possible?

Yes it is absolutely possible. I had a base supercharger (ECS/Paxton) on my SS with stock engine, stock exhaust, and no methanol injection. Low pressure fuel pump was upgraded to ZL1, but the hpfp and injectors were still stock LT1 at that point. My stock high pressure pump was not keeping up, and the rail pressure dropped in the upper end (centrifugal blower so they only make full boost at the top end). And this kit was the lowest-boost one that was meant for a stock LT1.

Procharger guy told us a while back that not every car can make the same power on it's stock fuel system, my experience and yours obviously support this over the blanket claims. Yes I am saying that if CSP tells you that your fuel is maxed, then I think that you should believe them.

[19 2SS]

Originally Posted by wnta1ss

Yes it is absolutely possible. I had a base supercharger (ECS/Paxton) on my SS with stock engine, stock exhaust, and no methanol injection. Low pressure fuel pump was upgraded to ZL1, but the hpfp and injectors were still stock LT1 at that point. My stock high pressure pump was not keeping up, and the rail pressure dropped in the upper end (centrifugal blower so they only make full boost at the top end). And this kit was the lowest-boost one that was meant for a stock LT1.

Procharger guy told us a while back that not every car can make the same power on it's stock fuel system, my experience and yours obviously support this over the blanket claims. Yes I am saying that if CSP tells you that your fuel is maxed, then I think that you should believe them.

Yea but in my situation I have the zl1 hpfp so that’s why I’m confused as to how I could be out of fuel

[KingLT1]

Do you have the entire LT4 fuel system hight to low(Injectors, HPFP, LPFP)?

[19 2SS]

Originally Posted by KingLT1

Do you have the entire LT4 fuel system hight to low(Injectors, HPFP, LPFP)?

I have the hpfp

[Joshinator99]

Originally Posted by KingLT1

Do you have the entire LT4 fuel system hight to low(Injectors, HPFP, LPFP)?

Originally Posted by 19 2SS

I have the hpfp

The LPFP usually runs out first and needs a voltage booster, stat. Then, the HPFP runs out not far behind. Can’t remember off hand when the LT1 injectors drop off but you should have changed them when you did the HPFP, IMO.

Do you have data from CSP? Otherwise we’re guessing. Need to know:
1. Low side pressure
2. High side pressure
3. Injector pulse width

[wnta1ss]

Originally Posted by 19 2SS

Yea but in my situation I have the zl1 hpfp so that’s why I’m confused as to how I could be out of fuel

Sorry, I did not notice your sig about the LT4. But, if you only have the hpfp changed, perhaps your low side pump is falling? You could ask CSP what you need to fix before pushing it further.

[JANNETTYRACING]

Originally Posted by 19 2SS

When you say the big gulp will net me nothing, are you aware that im currently running the stock intake, not even a standard rotofab?

I talked to the guys at CSP yesterday who did my car, and they said that I was at the end of my fuel system when the car made 557whp, is that even possible?

No I was comparing standard rotofab to big gulp at your power level.

You can certainly benefit from a Standard rotofab and 95 mm tb.

https://jannettyracing.com/products/...-including-z06

If you add a JMS fuel system voltage booster your fuel system will support 580 RWHP but that's it.

I recommend adding our LT1 fuel system upgrade package which includes the JMS


https://jannettyracing.com/products/...2018-camaro-ss

[KingLT1]

Originally Posted by 19 2SS

I have the hpfp

That is your issue...you need the entire LT4 fuel system high to low. Just changing the HPFP gained you very little.

[19 2SS]

Originally Posted by KingLT1

That is your issue...you need the entire LT4 fuel system high to low. Just changing the HPFP gained you very little.

I knew I should've told them to do the whole thing, I wonder why they only suggested the high side.. and the blower has to come off for this doesnt it?

[Joshinator99]

Originally Posted by 19 2SS

I knew I should've told them to do the whole thing, I wonder why they only suggested the high side.. and the blower has to come off for this doesnt it?

Doing the HPFP and not the injectors does not make much sense IMO. The LT4 HPFP runs a higher pressure that the LT1 injectors are not supposed to run. Complete mismatch IMO. Maybe someone knows something else that I’m missing?

[19 2SS]

Originally Posted by KingLT1

That is your issue...you need the entire LT4 fuel system high to low. Just changing the HPFP gained you very little.

I’m being told that my best option is a better cam, and that the high side is the one that’s running out

[Joshinator99]

Originally Posted by 19 2SS

I’m being told that my best option is a better cam, and that the high side is the one that’s running out

See my post above. Stock LT1 low side is weakest link. But your high side is a mess too, running LT4 HPFP and LT1 injectors that need lower pressures than what the LT4 HPFP wants to put out.

LT4 in tank with JMS
LT4 HPFP with cam
LT4 injectors

That combo will get you in the right direction to make power with a blower.

[19 2SS]

Originally Posted by Joshinator99

See my post above. Stock LT1 low side is weakest link. But your high side is a mess too, running LT4 HPFP and LT1 injectors that need lower pressures than what the LT4 HPFP wants to put out.

LT4 in tank with JMS
LT4 HPFP with cam
LT4 injectors

That combo will get you in the right direction to make power with a blower.

I agree this makes a lot more sense, in the same breath I have trust in what the guys at CSP are saying but they could be mistaken who knows..

He’s what they’re saying.
Me: I meant like do you think I’m running out at this level because I only have the high side done? No injectors/low side
Them: No, that is what was running out, not the low side or injectors. They are independent, If the low side was dropping that can cause the high side to run out but the low side was holding steady