So yeah here's my dilema. 95 TSi with filter, 3" turboback, 190 LPH fuel pump, FIC 650cc's, DSMLINK, pte 50 trim turbo, stock cams, stock head, stock intake, but no afpr. The thing is is that I'm currently tuning on 20-21 psi on 91 craptane CA gas and I noticed on my last few runs that i've been VERY close to running my IDC's to 100%. I mean like 99%-100% duty cycles. Question is I've been reading on the forums the guys that have been running a slightly higher base fuel pressure via B&M FPR to get the most out of their injectors i.e. 450cc acting like 500cc @ 50 psi base pressure plus xx amount of boost. Question is my aim is to have around 330whp on 91 octane gas with hks cams of course but was wondering if I get a B&M fpr and raise the pressure a bit will my 190 be able to support all that pressure and 330 whp? I really don't want to go with the afpr route cause I'm pretty sure that I'm getting really close to my whp mark and don't really want to mod after i'm done reaching it. All I want to do is get the most out of my injectors w/out buying bigger injectors yet like 880's. so it's either stay on the 190 w/out afpr, or stick with the 190 with b&M or/go with a 255hp with b&M and raise it a bit. I know about the whole running high pressure is not advised but I prefer to go this route.
190LPH Walbro, Can it handle the High pressure I throw at it?
GOTLAUNCH?
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So yeah here's my dilema. 95 TSi with filter, 3" turboback, 190 LPH fuel pump, FIC 650cc's, DSMLINK, pte 50 trim turbo, stock cams, stock head, stock intake, but no afpr. The thing is is that I'm currently tuning on 20-21 psi on 91 craptane CA gas and I noticed on my last few runs that i've been VERY close to running my IDC's to 100%. I mean like 99%-100% duty cycles. Question is I've been reading on the forums the guys that have been running a slightly higher base fuel pressure via B&M FPR to get the most out of their injectors i.e. 450cc acting like 500cc @ 50 psi base pressure plus xx amount of boost. Question is my aim is to have around 330whp on 91 octane gas with hks cams of course but was wondering if I get a B&M fpr and raise the pressure a bit will my 190 be able to support all that pressure and 330 whp? I really don't want to go with the afpr route cause I'm pretty sure that I'm getting really close to my whp mark and don't really want to mod after i'm done reaching it. All I want to do is get the most out of my injectors w/out buying bigger injectors yet like 880's. so it's either stay on the 190 w/out afpr, or stick with the 190 with b&M or/go with a 255hp with b&M and raise it a bit. I know about the whole running high pressure is not advised but I prefer to go this route.
Welcome to 'Tuning with 91 Craptane'!
I wasn't sorry when I got 720's to go with my Big 16G. Since every car is different, you won't know if your fuel system can handle higher pressure until you try. If it doesn't work, just open up the fuel lines so they can flow more without as much pressure drop. I've had good luck with the AutoAlchemy (are they still around?) fuel line inlet. I think SlowBoy also sells them for cheap.
Good luck on being satisfied with 330 whp.
I wasn't sorry when I got 720's to go with my Big 16G. Since every car is different, you won't know if your fuel system can handle higher pressure until you try. If it doesn't work, just open up the fuel lines so they can flow more without as much pressure drop. I've had good luck with the AutoAlchemy (are they still around?) fuel line inlet. I think SlowBoy also sells them for cheap.
Good luck on being satisfied with 330 whp.
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2,660 Posts
450s act like 500s with 53 psi base like I have.
I did some math and you already outran the pump.
A rewired 190hp at 65 psi will flow around 163 l/hr.
4- 650 injectors at 100 dc at 21 psi will flow
((64/43) root2) (650) = 793 cc X 4 =3172cc = 190.3 l/hr.
Thats just the math I get and use.
A 255hp at 64 psi will flow around 58.5 g/hr or 221.5 l/hr. I think you will need it for the numbers you want. A higher base will also help fix overrun at idle and vac but a 255 may be too much flow for a linear curve even with the higher base. The 190hp only flows 1 psi over stock I have found, its not a real big pump but its good for a t28. How much does a 50 trim flow?
I did some math and you already outran the pump.
A rewired 190hp at 65 psi will flow around 163 l/hr.
4- 650 injectors at 100 dc at 21 psi will flow
((64/43) root2) (650) = 793 cc X 4 =3172cc = 190.3 l/hr.
Thats just the math I get and use.
A 255hp at 64 psi will flow around 58.5 g/hr or 221.5 l/hr. I think you will need it for the numbers you want. A higher base will also help fix overrun at idle and vac but a 255 may be too much flow for a linear curve even with the higher base. The 190hp only flows 1 psi over stock I have found, its not a real big pump but its good for a t28. How much does a 50 trim flow?
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152 Posts
CFM wise or what?
I hope you don't mind if I nitpick your calculations, but I found an error in the ammount of fuel pressure used to calculate injector flow.95tsiawdgst said:
The number '64' was derived from base fuel pressure (43)plus boost pressure (21) correct? That's fine for calculating fuel pump flow, since the pump will actually see that pressure and more due to pressure drop in the stock lines and restrictive fiter. But the injectors will always see base fuel pressure, no matter where the boost is set. So 4 650 cc injectors at 43 base pressure will flow 2600cc.
Another dillema to keep in mind when tuning with fuel pressure is that higher fuel pressure reduces the flow of the pump, while increasing the output of the injectors.
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I think you might be wrightDRW said:
. I know how fuel pressure raises the way it does to compensate the the internal pressure increases, I just didn't add it to my calculations.That means I have more fuel than I thought even though I'm not going over 53 psi base.
yeah cfm would be fine.
According to my newly revised math, about 47 base is the highest you can run. 2600cc vs. 2718cc.
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