Question about injectors/FPR - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

rocksteady_racer · 03-11-2007, 03:19 AM

Ok so I plan to run about 500HP later down the road but right now I'm just going to run the stock turbo at 15psi for a while. I'm running an s13 redtop with a haltech ecu(e8) and a walbro 255. Should I get a nismo fpr to handle the pressure or should I choose a different FPR? I'm thinking either 740cc or 850cc injectors. The question is should I go with side feed or top feed injectors. Also peak and hold or saturated? I've read about both and am still totally confused. I know with top feed I need a new rail but they are also cheaper. Is there any down side to topfeed that would make side feed better? And would I need a different fpr with the new rail? Thanks for answering my questions in advance

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bo2o · 03-11-2007, 05:13 AM

i would say go with a adjustable fpr.

what motor are you running? 500hp sounds kinda high if you only have injectors and fpr

i would say change your cam and rebuild head and head gasket. with slightly bigger injector then get wideband and tune it.

oki_dorifuto · 03-11-2007, 07:33 AM

you really don't need an fpr since 850cc injectors will give you all the fuel you need to make about 500 hp... stock fpr is completely fine... but its going to be hard to tune with 850's in a car only making 300 hp (thats only what im estimating you have)

and bo20 it sounds like he doesn't plan on making 500 hp with just injectors and fpr... he says it will come later down the road

rocksteady_racer · 03-11-2007, 03:58 PM

Yes, I'm going to start out with the stock turbo for at least a couple months to get down driving with that then upgrade to a more powerful one. I've already got the head rebuild planned also. I'm probably going to use the haltech wideband kit to tune it since it'll plug right into my ecu. Now the bigger question: side feed or top feed? Anyone have any insight on that?

03-11-2007, 03:19 AM	#1
rocksteady_racer Zilvia Junkie Join Date: Oct 2005 Location: Phila Age: 39 Posts: 544 Trader Rating: (0) Feedback Score: 0 reviews	Question about injectors/FPR Ok so I plan to run about 500HP later down the road but right now I'm just going to run the stock turbo at 15psi for a while. I'm running an s13 redtop with a haltech ecu(e8) and a walbro 255. Should I get a nismo fpr to handle the pressure or should I choose a different FPR? I'm thinking either 740cc or 850cc injectors. The question is should I go with side feed or top feed injectors. Also peak and hold or saturated? I've read about both and am still totally confused. I know with top feed I need a new rail but they are also cheaper. Is there any down side to topfeed that would make side feed better? And would I need a different fpr with the new rail? Thanks for answering my questions in advance .

03-11-2007, 05:13 AM	#2
bo2o Zilvia FREAK! Join Date: May 2006 Location: 626 socal! Posts: 1,315 Trader Rating: (7) Feedback Score: 7 reviews	i would say go with a adjustable fpr. what motor are you running? 500hp sounds kinda high if you only have injectors and fpr i would say change your cam and rebuild head and head gasket. with slightly bigger injector then get wideband and tune it. __________________ fS! *vlsd ! slim fans ! hid kits ! lug nuts !* http://www.zilvia.net/f/search.php?d...earchuser=bo2o ^^^click^^^

03-11-2007, 03:58 PM	#4
rocksteady_racer Zilvia Junkie Join Date: Oct 2005 Location: Phila Age: 39 Posts: 544 Trader Rating: (0) Feedback Score: 0 reviews	Ok good points Yes, I'm going to start out with the stock turbo for at least a couple months to get down driving with that then upgrade to a more powerful one. I've already got the head rebuild planned also. I'm probably going to use the haltech wideband kit to tune it since it'll plug right into my ecu. Now the bigger question: side feed or top feed? Anyone have any insight on that?

03-11-2007, 07:33 AM	#3
oki_dorifuto Join Date: Mar 2007 Location: Okinawa, Japan Age: 34 Posts: 1 Trader Rating: (0) Feedback Score: 0 reviews	you really don't need an fpr since 850cc injectors will give you all the fuel you need to make about 500 hp... stock fpr is completely fine... but its going to be hard to tune with 850's in a car only making 300 hp (thats only what im estimating you have) and bo20 it sounds like he doesn't plan on making 500 hp with just injectors and fpr... he says it will come later down the road