Help RB26DETT BCNR33 - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

Alfonso Wen Ja · 19th August 2008, 01:47 AM

Hi, friends I'm new from this web,
I would like someone to help me with idea, about my problem.
I started to make some mod, few month ago my RB26DETT,
first at all is engine all internals stock, I got
-Twin HKS GT-RS 52T AR0.60,
-SARD 1000ccX6
-Stock Fuel Pump + Tomei 286lph fuel pump in tank.
-Mine's ECU
-S-AFC II
-Aeromitive A1001 FPR
-BKR7EXI NGK Iridium
-HKS IV Boost Controller
-Blitz BOV (x2)
_________________________________________
Ok, Here's my problem, after intalled all the toys,tuned last night with the SAFC and wideband the car in 2000RPM-up is Ok,but in lower than 2000rpm the rpm is oscillating to off, I dont know why,
I would like to know if the 6XSARD Injectors is too big? The FPR is in 20psi
or the S-AFC II is not able to manage the AFR at this size of Injectors?
Is possible to get 700HP+ with SAFC? or I have to get a Standalone?
Sorry for my language, is not good but hope ya guys understand me.

Please alls ideas are wealcome!

Thanks......

miragev · 19th August 2008, 10:18 AM

as far as i know you need a standalone such as a power fc to control the new larger injectors ...because the cars ecu will still think it's controlling the standard 440c injectors ....is it possible to change the injector lag times with the s-afc ? as i don't think it is

Alfonso Wen Ja · 19th August 2008, 01:17 PM

but have you ever had this problem of oscillaiting after
put larger injectors?

Mashrock · 19th August 2008, 01:41 PM

Computer for sure, its the only thing you have missing out of the whole package. get a power fc or something similar and you will be sorted

you have more than doubled your injectors from stock so i'd expect the idle/low rpm to be affected. 1000cc are fairly overkill also for a stock internal motor Also

kgleeson · 19th August 2008, 02:33 PM

The 1000cc injectors have a higher lag time and can be trickier to map low down. Unless you can control the injectors and lag with the SAFC adequately you are going to struggle.

You maybe better off with the 720 / 800cc but you need to check the specs of them as some of the 800cc have the higher injector lag time as well. Not sure 20psi is correct either thought it needed to be higher than this on tick over which wont help either.

The GT RS turbos are a little big for a standard internal RB26 as well, you may well have a fair bit if lag before good boost is made and I woudl not rev the standard motor abive 7500rpm. So you powerband will be limited I image to around 4500 - 5000rpm to 7500. So you need to chnage gear quick when you get on boost

Kev

mp302007 · 19th August 2008, 10:04 PM

stupid question...is the setup running stock ecu and airflow meters with non-recirculating dump valves? if so, i'd have thought that at low revs and at tick-over, vacuum opens the valves and looses all the air thats been metered, making the engine run very rich. engine will stumble, loose the vac, dumps shut and engine picks up. vacuum is re-established, dumps open, etc...

if you fit non-recirc. valves, i think you need to loose the air flow (mass) meters, ie.

as a test, temporarily disconnect the feed to the dump valves (block up the hose with a drill bit or similar) and see if the problem is still there.

only my two-bobs worth. regards,

Alfonso Wen Ja · 20th August 2008, 12:34 AM

Guys, let me try all my best to search my problem,
thanks for share your knowledge,
if I solve my problem I'll let us know...

Thanks....

tarmac terror · 21st August 2008, 11:00 AM

Just a small point but I think you would be better using heat range 8 plugs rather than the 7's.

TT

Alfonso Wen Ja · 21st August 2008, 02:06 PM

Hi, Guys
since i'm looking for solve my problem,
I decided to take my safc2 off and get an Fuel Ignition Controller
by AEM (F/IC) have some one experiment this piggyback?
It was recoment by a friend from Costa rica, has already tuned by F/IC
has almost the same spec but just other brands, like twin turbos brand POWER JAPAN, 1200cc Fuel Injectors and running smooth in low rpm but not mine, and 255lph walbro in tank + external fuel pump, Mine's VX-ROM and the number at the wheels is 790hp +
I think the AEM F/IC will solve my problem.

how did you guys, think???

Stachi · 22nd August 2008, 08:52 AM

Get a PowerFC

Used ones from here are cheap (read: Worth their money) and many people can actually work with it/tune it.

Marc

Mashrock · 25th August 2008, 02:00 AM

I take it your using someone else to tune the computer?

i would go and visit whoever your going to get to tune your car and see what computers they recommend or what they can tune,

power fc is probably your best bet. tho see what the tuner will like.

Alfonso Wen Ja · 27th August 2008, 02:43 AM

Hi guys again,
all this days I was trying to found the problem, I have make some test to search the problem,
1) I dicided to take off my SARD 1000cc jet off and back again to the stock one and the RPM still oscillating and when I accelarate and the rev go down the engine off.
2) I test the vaccum of the BLITZ BOV; I have disconect the BOV and I block the vaccum hose and theres no vacumm leak. the same problem.
3)Now I found problem in the problem of the AFM signal; I disconnect the AFM signals and put again to the normal mode as stock ecu and I start the engine, and everything is OK, no oscillating, no turn off, so I think that I have a problem with my AFM signal? I also test it with another extra AFM but isnt the problem.
Also I though it was the safc problem and I have change another and the same thing.

PLESE HELP, Any Ideas?????

19th August 2008, 01:47 AM	#1 (permalink)
Alfonso Wen Ja GTR Register Member Join Date: Mar 2008 Posts: 14	Help RB26DETT BCNR33 Hi, friends I'm new from this web, I would like someone to help me with idea, about my problem. I started to make some mod, few month ago my RB26DETT, first at all is engine all internals stock, I got -Twin HKS GT-RS 52T AR0.60, -SARD 1000ccX6 -Stock Fuel Pump + Tomei 286lph fuel pump in tank. -Mine's ECU -S-AFC II -Aeromitive A1001 FPR -BKR7EXI NGK Iridium -HKS IV Boost Controller -Blitz BOV (x2) _________________________________________ Ok, Here's my problem, after intalled all the toys,tuned last night with the SAFC and wideband the car in 2000RPM-up is Ok,but in lower than 2000rpm the rpm is oscillating to off, I dont know why, I would like to know if the 6XSARD Injectors is too big? The FPR is in 20psi or the S-AFC II is not able to manage the AFR at this size of Injectors? Is possible to get 700HP+ with SAFC? or I have to get a Standalone? Sorry for my language, is not good but hope ya guys understand me. Please alls ideas are wealcome! Thanks......

19th August 2008, 02:33 PM	#5 (permalink)
kgleeson GTR Register Member Join Date: Sep 2003 Location: Gloucestershire Posts: 1,185	Problem The 1000cc injectors have a higher lag time and can be trickier to map low down. Unless you can control the injectors and lag with the SAFC adequately you are going to struggle. You maybe better off with the 720 / 800cc but you need to check the specs of them as some of the 800cc have the higher injector lag time as well. Not sure 20psi is correct either thought it needed to be higher than this on tick over which wont help either. The GT RS turbos are a little big for a standard internal RB26 as well, you may well have a fair bit if lag before good boost is made and I woudl not rev the standard motor abive 7500rpm. So you powerband will be limited I image to around 4500 - 5000rpm to 7500. So you need to chnage gear quick when you get on boost Kev

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19th August 2008, 10:18 AM	#2 (permalink)
miragev GTR Register Member Join Date: Apr 2007 Location: greece Posts: 641	as far as i know you need a standalone such as a power fc to control the new larger injectors ...because the cars ecu will still think it's controlling the standard 440c injectors ....is it possible to change the injector lag times with the s-afc ? as i don't think it is

19th August 2008, 01:17 PM	#3 (permalink)
Alfonso Wen Ja GTR Register Member Join Date: Mar 2008 Posts: 14	but have you ever had this problem of oscillaiting after put larger injectors?

19th August 2008, 01:41 PM	#4 (permalink)
Mashrock GTR Register Member Join Date: Jan 2005 Location: Sydney, Australia Posts: 161	Computer for sure, its the only thing you have missing out of the whole package. get a power fc or something similar and you will be sorted you have more than doubled your injectors from stock so i'd expect the idle/low rpm to be affected. 1000cc are fairly overkill also for a stock internal motor Also

19th August 2008, 10:04 PM	#6 (permalink)
mp302007 GTR Register Member Join Date: Nov 2005 Location: Belper, Derbyshire Posts: 123	stupid question...is the setup running stock ecu and airflow meters with non-recirculating dump valves? if so, i'd have thought that at low revs and at tick-over, vacuum opens the valves and looses all the air thats been metered, making the engine run very rich. engine will stumble, loose the vac, dumps shut and engine picks up. vacuum is re-established, dumps open, etc... if you fit non-recirc. valves, i think you need to loose the air flow (mass) meters, ie. as a test, temporarily disconnect the feed to the dump valves (block up the hose with a drill bit or similar) and see if the problem is still there. only my two-bobs worth. regards,

20th August 2008, 12:34 AM	#7 (permalink)
Alfonso Wen Ja GTR Register Member Join Date: Mar 2008 Posts: 14	Guys, let me try all my best to search my problem, thanks for share your knowledge, if I solve my problem I'll let us know... Thanks....

21st August 2008, 11:00 AM	#8 (permalink)
tarmac terror New Users Join Date: Jul 2003 Location: Hampshire, but Scottish through and through! Posts: 2,621	Just a small point but I think you would be better using heat range 8 plugs rather than the 7's. TT

21st August 2008, 02:06 PM	#9 (permalink)
Alfonso Wen Ja GTR Register Member Join Date: Mar 2008 Posts: 14	Hi, Guys since i'm looking for solve my problem, I decided to take my safc2 off and get an Fuel Ignition Controller by AEM (F/IC) have some one experiment this piggyback? It was recoment by a friend from Costa rica, has already tuned by F/IC has almost the same spec but just other brands, like twin turbos brand POWER JAPAN, 1200cc Fuel Injectors and running smooth in low rpm but not mine, and 255lph walbro in tank + external fuel pump, Mine's VX-ROM and the number at the wheels is 790hp + I think the AEM F/IC will solve my problem. how did you guys, think???

22nd August 2008, 08:52 AM	#10 (permalink)
Stachi GTROC Member Join Date: Jan 2008 Location: Near Stuttgart, Germany Posts: 827	Get a PowerFC Used ones from here are cheap (read: Worth their money) and many people can actually work with it/tune it. Marc

25th August 2008, 02:00 AM	#11 (permalink)
Mashrock GTR Register Member Join Date: Jan 2005 Location: Sydney, Australia Posts: 161	I take it your using someone else to tune the computer? i would go and visit whoever your going to get to tune your car and see what computers they recommend or what they can tune, power fc is probably your best bet. tho see what the tuner will like.

27th August 2008, 02:43 AM	#12 (permalink)
Alfonso Wen Ja GTR Register Member Join Date: Mar 2008 Posts: 14	Hi guys again, all this days I was trying to found the problem, I have make some test to search the problem, 1) I dicided to take off my SARD 1000cc jet off and back again to the stock one and the RPM still oscillating and when I accelarate and the rev go down the engine off. 2) I test the vaccum of the BLITZ BOV; I have disconect the BOV and I block the vaccum hose and theres no vacumm leak. the same problem. 3)Now I found problem in the problem of the AFM signal; I disconnect the AFM signals and put again to the normal mode as stock ecu and I start the engine, and everything is OK, no oscillating, no turn off, so I think that I have a problem with my AFM signal? I also test it with another extra AFM but isnt the problem. Also I though it was the safc problem and I have change another and the same thing. PLESE HELP, Any Ideas?????