Stage 2 Pump No PI or Helix Limits

[KClemente]

What's the power and boost limit on Pure Stage 2 HF with just a Walbro 450 installed? Gonna go port or overdrive this summer and before then i'd like to get some sort of baseline on an E40-50 mix.

I've read as low as 520 whp to as high as 570 whp on an E40 mix. Going to target around 23-25 psi at 8* timing with a borderline safe 12.3-12.1 afr.

 

[ShocknAwe]

Assuming you mean with a new HPFP.

 

[Blaster3500]

It depends on the condition of the HPFP and how far you want to push it as far as rail pressures go. I think 525-550 is a realistic number.

 

[KClemente]

It depends on the condition of the HPFP and how far you want to push it as far as rail pressures go. I think 525-550 is a realistic number.

My hpfp has about 40k miles on it right now. I ran an e50 blend on stock turbos stock lpfp running 20 psi tapering down to 15 psi. Never went below 1650 psi high and 50 psi low.

I'll be happy if the walbro 450 and stock hpfp can handle 24 psi on an e40 blend with the pures.

 

[Blaster3500]

My hpfp has about 40k miles on it right now. I ran an e50 blend on stock turbos stock lpfp running 20 psi tapering down to 15 psi. Never went below 1650 psi high and 50 psi low.

I'll be happy if the walbro 450 and stock hpfp can handle 24 psi on an e40 blend with the pures.

I would guess that you would run out of rail pressure more like the 20-22 psi range on e40. It seems to vary by car. Recent HPFP tables may help a little as well. I ran out of rail pressure around 22-23 psi with GC lites on e30.