is it ok to boost 10psi?? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

luckie2hav3her · 02-22-2005, 02:23 PM

well i posted this before but i wasnt too convinced only 1 person replied =(
i have a sr with stock fuel managment.... no fuel pump nothing everythings stock.... and i wanted to boost 10psi on my t25.... will my fuel managment be able to handle 10psi daily driven??

Flybert · 02-22-2005, 02:37 PM

I wouldn't do it. Stock fuel maps are really lean down low and with more boost you are going to run SUPER LEAN.

Recluse · 02-22-2005, 02:42 PM

Its not recommended to boost more than stock 7psi with the stock 240 fuel pump. just wait and buy a walbro..they're pretty cheap.

nissantuner22 · 02-22-2005, 03:00 PM

its like 95 bucks shipped for a new fuel pump. dont be a cheap ass.

timmybgood · 02-22-2005, 04:03 PM

yea don't risk it, there's a good chance you could run lean and damage something. i got my walbro off ebay for under 90 shipped, brand new

drewtoes · 02-22-2005, 04:06 PM

yea i wouldnt do it either,just to be safe, because you will probably end up spending more money. just buy a new and better fuel pump.

Campos · 02-22-2005, 04:07 PM

Quote:

Originally Posted by timmybgood

yea don't risk it, there's a good chance you could run lean and damage something. i got my walbro off ebay for under 90 shipped, brand new

yeah get a walbro and boost like 15.......ok ok 14.5 to play it safe

drewtoes · 02-22-2005, 04:11 PM

ahahah WORD!

luckie2hav3her · 02-22-2005, 04:25 PM

lol 15 psi... i have the s13 turbo not the s15.... im not cheap!! >.< heh jus wanted to kno if i could get away with it.... so just the fuel pump then?? n e common problems with the walbro? i heard theyre not reliable that "denso" is better... but then again u hear a lot of things about shit... so much competition out there.....so fuel pump only?? thx!!

ihmeg · 02-22-2005, 04:30 PM

Quote:

Originally Posted by drft57pro

yeah get a walbro and boost like 15.......ok ok 14.5 to play it safe

so is the walbro fuel pump only good up to 15 psi? if thats true then what fuel pump should you get after that?

luckie2hav3her · 02-22-2005, 04:35 PM

T25 loses power after 13 psi.... gets too hot.... -.- do 15... then tell us wat happens

mr_240sx · 02-22-2005, 04:41 PM

ive been running my sr at 13 psi all last year with a fmic and everything is fine!
but yet again, i upgraded my fuel pump

Flybert · 02-22-2005, 04:47 PM

Quote:

Originally Posted by ihmeg

so is the walbro fuel pump only good up to 15 psi? if thats true then what fuel pump should you get after that?

You are misunderstanding what people are saying. Everyone is telling him to get a walboro because it is a high flow fuel pump which will automatically bump up his fuel pressure which will make it safer for him to run higher boost levels with no fuel control.

Now that that was said, it would still be in the original posters best interest to get a fuel controller and get this thing tuned before bumping up the boost. Try searching for a dyno/wideband readout of SR's with T25's running upped boost/walboro/no fuel controller. It's kind of hard to find stuff like that because most people who are going to the dyno and getting plugged into a wideband are using fuel controllers and tuning with them.

Yoshi · 02-22-2005, 05:06 PM

make sure you run and adjustable FPR, or you'd have an overly rich fuel condition w/o any ECU tuning or S-AFC. You'll need a way to measure your fuel pressure either way.

Var · 02-22-2005, 05:10 PM

running a 255 on a stock FPR is fine, it will be only be overly rich at idle..no biggie

Yoshi · 02-22-2005, 05:13 PM

Quote:

Originally Posted by westboroughpimp

running a 255 on a stock FPR is fine, it will be only be overly rich at idle..no biggie

I dunno man, I did that cuz someone told me the same thing, but down the road I found that I had ruined an O2 sensor and fouled a couple plugs... I think I'd rather just KNOW that I have the correct fuel pressure going

02 sensors aren't exactly cheap, I just wouldn't want anyone else following the way-too-rich path, and have it end up costing them $ like it did me.

*shrug* FWIW

Var · 02-22-2005, 05:14 PM

what's the point of upping the fuel pump then if you're gonna cut the fuel pressure back down to stock?

Yoshi · 02-22-2005, 05:16 PM

Quote:

Originally Posted by westboroughpimp

what's the point of upping the fuel pump then if you're gonna cut the fuel pressure back down to stock?

what? who said stock?
I was just saying he should have a FPR to have the correct amount of fuel (at least as correct as u can be without real tuning) for whatever boost he ends up wanting to go with.

luckie2hav3her · 02-22-2005, 05:24 PM

wow all this for an extra 3-5 psi... ok so wats the easiest cheapest way to boost more?? i was thinking the walbro + HKS actuator kit.... but now im being told that you also need a fpr for more boost?? i just want more boost!! haha any ideas anyone??

Yoshi · 02-22-2005, 05:27 PM

Quote:

Originally Posted by luckie2hav3her

wow all this for an extra 3-5 psi... ok so wats the easiest cheapest way to boost more?? i was thinking the walbro + HKS actuator kit.... but now im being told that you also need a fpr for more boost?? i just want more boost!! haha any ideas anyone??

well westboroughpimp is right, you don't NEED to have an adjustable FPR, but if you don't have any air/fuel controller of any kind, you're just asking for problems... some more expensive than others.

You could get by with a home depot manual boost controller and kick it up to 10psi right now if u wanted to, it just wouldn't be very safe, and a gamble as to when something would fail.

Flybert · 02-22-2005, 05:33 PM

Quote:

Originally Posted by westboroughpimp

what's the point of upping the fuel pump then if you're gonna cut the fuel pressure back down to stock?

Even though I'm not using a FPR with my walboro, it provides you the capacity to flow enough fuel at higher HP levels. With a stock fuel pump designed for a lower HP engine, it might not be able to keep up with the demand of a high HP engine causing you to run lean and blow your engine. Somebody correct me if I'm wrong but that is generally what I've learned.

luckie2hav3her · 02-22-2005, 05:33 PM

ironic... i use to work at home depot.... o_O haha well fuck that, i wanna play it safe, Ive had my share of fuck ups.... so basically go with the walboro, S-AFC and AVC-R to boost more?? this sucks... haha

Var · 02-22-2005, 05:34 PM

dude..no no and no.

First of all an HKS actuator i've read defualts 12psi so you dont want that.
You need a reliable boost controller and a walbro. You dont NEED a/f controller. It's not asking for trouble. The only problems is that injectors will be stressin harder, which tuning doesnt help. You wont be runnin rich enough to mess up your engine. I've been running Profec E-01 and walbro 255 and full exhaust with 13.5psi(also FMIC, full exhaust) No problems. In fact it's better to be running rich with a cheap boost controller cause a boost spike will have less chance of detonating. Fuel control isnt the issue here, it's all about getting a good boost controller that wont spike. As long as boost is steady 10psi is no problem

Yoshi · 02-22-2005, 05:52 PM

Quote:

Originally Posted by westboroughpimp

dude..no no and no.

First of all an HKS actuator i've read defualts 12psi so you dont want that.
You need a reliable boost controller and a walbro. You dont NEED a/f controller. It's not asking for trouble. The only problems is that injectors will be stressin harder, which tuning doesnt help. You wont be runnin rich enough to mess up your engine. I've been running Profec E-01 and walbro 255 and full exhaust with 13.5psi(also FMIC, full exhaust) No problems. In fact it's better to be running rich with a cheap boost controller cause a boost spike will have less chance of detonating. Fuel control isnt the issue here, it's all about getting a good boost controller that wont spike. As long as boost is steady 10psi is no problem

Ooo... yeah, that's a very good point man.
I'm all about having the proper fuel for whatever application... (I thought that was a given, but if it were, this whole thread wouldn't be here).

so officially, for the original poster:
It is FAR better to be too rich than too lean.

westboroghpimp: how do you like the profec E-01? I'm torn tween that and the Blitz sbc-iD... I'm really partial to GReddy for some reason tho

Var · 02-22-2005, 06:01 PM

the E-01 is too much for my needs. I'm gonna sell it when i sell my SR. I wouldnt bother with it unless you are SURE you want to run E-manage.

Campos · 02-22-2005, 06:04 PM

get enthalpy to tune your rom and screw the afc and fpr....

luckie2hav3her · 02-22-2005, 06:05 PM

hmm a did a lil forum search, and found out that

Originally Posted by vanquish2
ok...my official correction of my previous statement. After checking the lines more closely and doing more research...hooking the line from the wastegate to tb will get you 7lb. hooking the wastegate to the solenoid then to tb does what has been said....it actually restricts the airflow and brings you to 11lb....no vac on wastegate does indeed give infinite boost (not good)....thank you guys for questioning me and helping me learn and not treating me like a dumbass...you guys are awesome....yet again proves....this is a great board! Keep up the good work!

(tb?? dunno wat that ment)

so yea... wat if i do that with a walboro??

Var · 02-22-2005, 06:08 PM

tb-throttle body.

i dunno how stable that will be as far as spiking is concerned. most ppl say you dont wanna run over 10psi with a SMIC, but the walbro wont be the weak link in this chain.

Campos · 02-22-2005, 06:09 PM

Quote:

Originally Posted by luckie2hav3her

hmm a did a lil forum search, and found out that

Originally Posted by vanquish2
ok...my official correction of my previous statement. After checking the lines more closely and doing more research...hooking the line from the wastegate to tb will get you 7lb. hooking the wastegate to the solenoid then to tb does what has been said....it actually restricts the airflow and brings you to 11lb....no vac on wastegate does indeed give infinite boost (not good)....thank you guys for questioning me and helping me learn and not treating me like a dumbass...you guys are awesome....yet again proves....this is a great board! Keep up the good work!

(tb?? dunno wat that ment)

so yea... wat if i do that with a walboro??

tb = throttle body, just get a DNA man. boost controller

luckie2hav3her · 02-22-2005, 06:12 PM

ohhh yeaa forgot to mention... cuz ive seen it mentioned a lot.... the whole fmic thingy, i didnt think it mattered.... but my car does have bolt ons, and i do have a greddy fmic.... so add walboro, run line from wastegate to solenoid to tb and Ill have 11psi??

02-22-2005, 02:23 PM	#1
luckie2hav3her BANNED Join Date: Mar 2004 Location: Los Angeles Posts: 348 Trader Rating: (0) Feedback Score: 0 reviews	is it ok to boost 10psi?? well i posted this before but i wasnt too convinced only 1 person replied =( i have a sr with stock fuel managment.... no fuel pump nothing everythings stock.... and i wanted to boost 10psi on my t25.... will my fuel managment be able to handle 10psi daily driven??

02-22-2005, 03:00 PM	#4
nissantuner22 Zilvia FREAK! Join Date: Mar 2004 Location: Gainesville, Fl Age: 40 Posts: 1,056 Trader Rating: (-1) Feedback Score: -1 reviews	its like 95 bucks shipped for a new fuel pump. dont be a cheap ass. __________________ Current Project: Operation: N/A SR: 93 Silvia Q SR20DE Engine with go fast goodies. , "Common problems 240sx's suffer from are curbs, trees, ditches, and other immovable objects."thx247 "on the tounge... there is no guardrails."- citizen

02-22-2005, 04:03 PM	#5
timmybgood Zilvia Member Join Date: Mar 2003 Location: central ohio Age: 41 Posts: 229 Trader Rating: (0) Feedback Score: 0 reviews	yea don't risk it, there's a good chance you could run lean and damage something. i got my walbro off ebay for under 90 shipped, brand new __________________ 1995 SE

02-22-2005, 05:06 PM	#14
Yoshi Post Whore! Join Date: Jul 2001 Location: Washington Age: 48 Posts: 3,003 Trader Rating: (1) Rides Gallery: Yoshi Feedback Score: 1 reviews	make sure you run and adjustable FPR, or you'd have an overly rich fuel condition w/o any ECU tuning or S-AFC. You'll need a way to measure your fuel pressure either way. __________________ www.360realms.com/S13-S15

02-22-2005, 05:10 PM	#15
Var Post Whore! Join Date: Sep 2003 Location: Norcal Age: 43 Posts: 5,032 Trader Rating: (0) Rides Gallery: Var Feedback Score: 0 reviews	running a 255 on a stock FPR is fine, it will be only be overly rich at idle..no biggie __________________ Hi

02-22-2005, 02:37 PM	#2
Flybert Post Whore! Join Date: Mar 2003 Location: none Posts: 3,862 Trader Rating: (7) Feedback Score: 7 reviews	I wouldn't do it. Stock fuel maps are really lean down low and with more boost you are going to run SUPER LEAN.

02-22-2005, 02:42 PM	#3
Recluse Join Date: Jan 2004 Location: Vermont Age: 43 Posts: 43 Trader Rating: (0) Feedback Score: 0 reviews	Its not recommended to boost more than stock 7psi with the stock 240 fuel pump. just wait and buy a walbro..they're pretty cheap.

02-22-2005, 04:06 PM	#6
drewtoes Leaky Injector Join Date: Jan 2005 Location: useless userville Age: 42 Posts: 59 Trader Rating: (0) Feedback Score: 0 reviews	yea i wouldnt do it either,just to be safe, because you will probably end up spending more money. just buy a new and better fuel pump.

02-22-2005, 04:11 PM	#8
drewtoes Leaky Injector Join Date: Jan 2005 Location: useless userville Age: 42 Posts: 59 Trader Rating: (0) Feedback Score: 0 reviews	ahahah WORD!

02-22-2005, 04:25 PM	#9
luckie2hav3her BANNED Join Date: Mar 2004 Location: Los Angeles Posts: 348 Trader Rating: (0) Feedback Score: 0 reviews	lol 15 psi... i have the s13 turbo not the s15.... im not cheap!! >.< heh jus wanted to kno if i could get away with it.... so just the fuel pump then?? n e common problems with the walbro? i heard theyre not reliable that "denso" is better... but then again u hear a lot of things about shit... so much competition out there.....so fuel pump only?? thx!!

02-22-2005, 04:35 PM	#11
luckie2hav3her BANNED Join Date: Mar 2004 Location: Los Angeles Posts: 348 Trader Rating: (0) Feedback Score: 0 reviews	T25 loses power after 13 psi.... gets too hot.... -.- do 15... then tell us wat happens

02-22-2005, 04:41 PM	#12
mr_240sx Post Whore! Join Date: Nov 2004 Location: Ottawa Age: 38 Posts: 6,320 Trader Rating: (4) Rides Gallery: mr_240sx Feedback Score: 4 reviews	ive been running my sr at 13 psi all last year with a fmic and everything is fine! but yet again, i upgraded my fuel pump

02-22-2005, 05:14 PM	#17
Var Post Whore! Join Date: Sep 2003 Location: Norcal Age: 43 Posts: 5,032 Trader Rating: (0) Rides Gallery: Var Feedback Score: 0 reviews	what's the point of upping the fuel pump then if you're gonna cut the fuel pressure back down to stock? __________________ Hi

02-22-2005, 05:24 PM	#19
luckie2hav3her BANNED Join Date: Mar 2004 Location: Los Angeles Posts: 348 Trader Rating: (0) Feedback Score: 0 reviews	wow all this for an extra 3-5 psi... ok so wats the easiest cheapest way to boost more?? i was thinking the walbro + HKS actuator kit.... but now im being told that you also need a fpr for more boost?? i just want more boost!! haha any ideas anyone??

02-22-2005, 05:33 PM	#22
luckie2hav3her BANNED Join Date: Mar 2004 Location: Los Angeles Posts: 348 Trader Rating: (0) Feedback Score: 0 reviews	ironic... i use to work at home depot.... o_O haha well fuck that, i wanna play it safe, Ive had my share of fuck ups.... so basically go with the walboro, S-AFC and AVC-R to boost more?? this sucks... haha

02-22-2005, 05:34 PM	#23
Var Post Whore! Join Date: Sep 2003 Location: Norcal Age: 43 Posts: 5,032 Trader Rating: (0) Rides Gallery: Var Feedback Score: 0 reviews	dude..no no and no. First of all an HKS actuator i've read defualts 12psi so you dont want that. You need a reliable boost controller and a walbro. You dont NEED a/f controller. It's not asking for trouble. The only problems is that injectors will be stressin harder, which tuning doesnt help. You wont be runnin rich enough to mess up your engine. I've been running Profec E-01 and walbro 255 and full exhaust with 13.5psi(also FMIC, full exhaust) No problems. In fact it's better to be running rich with a cheap boost controller cause a boost spike will have less chance of detonating. Fuel control isnt the issue here, it's all about getting a good boost controller that wont spike. As long as boost is steady 10psi is no problem __________________ Hi

02-22-2005, 06:01 PM	#25
Var Post Whore! Join Date: Sep 2003 Location: Norcal Age: 43 Posts: 5,032 Trader Rating: (0) Rides Gallery: Var Feedback Score: 0 reviews	the E-01 is too much for my needs. I'm gonna sell it when i sell my SR. I wouldnt bother with it unless you are SURE you want to run E-manage. __________________ Hi

02-22-2005, 06:04 PM	#26
Campos Zilvia Addict Join Date: Jan 2005 Location: southeast tx Age: 41 Posts: 659 Trader Rating: (2) Feedback Score: 2 reviews	get enthalpy to tune your rom and screw the afc and fpr.... __________________ Parting out SR build....

02-22-2005, 06:05 PM	#27
luckie2hav3her BANNED Join Date: Mar 2004 Location: Los Angeles Posts: 348 Trader Rating: (0) Feedback Score: 0 reviews	hmm a did a lil forum search, and found out that Originally Posted by vanquish2 ok...my official correction of my previous statement. After checking the lines more closely and doing more research...hooking the line from the wastegate to tb will get you 7lb. hooking the wastegate to the solenoid then to tb does what has been said....it actually restricts the airflow and brings you to 11lb....no vac on wastegate does indeed give infinite boost (not good)....thank you guys for questioning me and helping me learn and not treating me like a dumbass...you guys are awesome....yet again proves....this is a great board! Keep up the good work! (tb?? dunno wat that ment) so yea... wat if i do that with a walboro??

02-22-2005, 06:08 PM	#28
Var Post Whore! Join Date: Sep 2003 Location: Norcal Age: 43 Posts: 5,032 Trader Rating: (0) Rides Gallery: Var Feedback Score: 0 reviews	tb-throttle body. i dunno how stable that will be as far as spiking is concerned. most ppl say you dont wanna run over 10psi with a SMIC, but the walbro wont be the weak link in this chain. __________________ Hi

02-22-2005, 06:12 PM	#30
luckie2hav3her BANNED Join Date: Mar 2004 Location: Los Angeles Posts: 348 Trader Rating: (0) Feedback Score: 0 reviews	ohhh yeaa forgot to mention... cuz ive seen it mentioned a lot.... the whole fmic thingy, i didnt think it mattered.... but my car does have bolt ons, and i do have a greddy fmic.... so add walboro, run line from wastegate to solenoid to tb and Ill have 11psi??