most power you've made on stock s15 maf/injectors? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

wutangben · 02-07-2018, 05:25 PM

stupid question, but I'm curious to know what the limits really are on stock maf/injectors.

I was always under the impression that that stuff maxed out around 250/260whp. Maybe a little higher for S15 motors? is 300whp possible?

thanks

carcrazee · 02-08-2018, 09:33 AM

over the years from what ive gathered for an SR, to reach 300hp, youl need 550cc injectors, t28 (15~18psi), Z-maf and a tune of some sort. ive heard of people using the stock s15 injectors(440cc) and reaching about 280hp but ive never seen a dyno sheet.

wutangben · 02-08-2018, 12:56 PM

I'm looking at a dynojet graph showing 292hp/232tq @12psi from an S15 SR with stock injectors, stock FPR, stock maf, but has a 3071 and cams. just didn't think that was possible, but getting conflicting opinions from legit sources. I assume you can tune beyond the MAFs resolution, but how do you get past the injector limitations?

gaz_moose · 02-09-2018, 06:52 AM

why would you have a stock MAF and injectors on a 3071 and cams?? just sounds stupid, bet it was bottom mount .64 rear also. proper idiot spec.

I had a bone stock s14 sr20 (so s14 FPR) with a gt2560r (or whatever a rollerbearing t28 actually is) s15 injectors and a z32 MAF and made a supposed 320 hp at the flywheel on nistune ECU. oh I had tubular mainifold etc.. and intercooler etc.. that would have been on a dyno jet or dynodynamics rolling road.

but assuming your engine is decent etc.. I would say stock s14 stuff with 15psi would get you 250hp/280hp. s15 injectors etc.. would net you more, so 300hp at a push. depends on the guy doing the mapping, if he is rinsing every last drop out of it or wants a conservative tune.

carcrazee · 02-09-2018, 08:25 AM

Quote:

Originally Posted by gaz_moose

why would you have a stock MAF and injectors on a 3071 and cams?? just sounds stupid, bet it was bottom mount .64 rear also. proper idiot spec.

I said the same thing to myself lol

LoSt180 · 02-09-2018, 12:26 PM

In for answers on the limits of the S15 440cc injectors.

02-07-2018, 05:25 PM	#1
wutangben Zilvia Addict Join Date: Sep 2003 Location: IL Age: 40 Posts: 739 Trader Rating: (3) Feedback Score: 3 reviews	most power you've made on stock s15 maf/injectors? stupid question, but I'm curious to know what the limits really are on stock maf/injectors. I was always under the impression that that stuff maxed out around 250/260whp. Maybe a little higher for S15 motors? is 300whp possible? thanks

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02-08-2018, 09:33 AM	#2
carcrazee Zilvia Member Join Date: Jan 2012 Location: failorida Posts: 236 Trader Rating: (1) Feedback Score: 1 reviews	over the years from what ive gathered for an SR, to reach 300hp, youl need 550cc injectors, t28 (15~18psi), Z-maf and a tune of some sort. ive heard of people using the stock s15 injectors(440cc) and reaching about 280hp but ive never seen a dyno sheet.

02-08-2018, 12:56 PM	#3
wutangben Zilvia Addict Join Date: Sep 2003 Location: IL Age: 40 Posts: 739 Trader Rating: (3) Feedback Score: 3 reviews	I'm looking at a dynojet graph showing 292hp/232tq @12psi from an S15 SR with stock injectors, stock FPR, stock maf, but has a 3071 and cams. just didn't think that was possible, but getting conflicting opinions from legit sources. I assume you can tune beyond the MAFs resolution, but how do you get past the injector limitations?

02-09-2018, 06:52 AM	#4
gaz_moose Zilvia Member Join Date: Mar 2008 Location: engerland Posts: 242 Trader Rating: (0) Feedback Score: 0 reviews	why would you have a stock MAF and injectors on a 3071 and cams?? just sounds stupid, bet it was bottom mount .64 rear also. proper idiot spec. I had a bone stock s14 sr20 (so s14 FPR) with a gt2560r (or whatever a rollerbearing t28 actually is) s15 injectors and a z32 MAF and made a supposed 320 hp at the flywheel on nistune ECU. oh I had tubular mainifold etc.. and intercooler etc.. that would have been on a dyno jet or dynodynamics rolling road. but assuming your engine is decent etc.. I would say stock s14 stuff with 15psi would get you 250hp/280hp. s15 injectors etc.. would net you more, so 300hp at a push. depends on the guy doing the mapping, if he is rinsing every last drop out of it or wants a conservative tune.

02-09-2018, 12:26 PM	#6
LoSt180 Zilvia Addict Join Date: May 2013 Location: MD Posts: 966 Trader Rating: (18) Feedback Score: 18 reviews	In for answers on the limits of the S15 440cc injectors.