the good old "will i hit fuelcut" question!
08-02-06, 01:32 AM
#1
the good old "will i hit fuelcut" question!
hi guys...
i've searched but didn't found a thread with the same setup...
car is 99% stock...
will i hit fuelcut with these setup?
stock turbo
stock intake
stock precat hollowed out
stock maincat hollowed out
3" Dual Catback
if i hit fuelcut, will i hit it in every gear or only in 4.th and 5.th on a full highway pull?
anyone here with the same setup?
when i get a FCD, how high will my boost spike? any expiriences? dangerously high? and how much boost can i drive with the stock turbo, stock internal wastegate and stock AFM + ECU so that my car don't runs to lean?
i know, the best way will be to port the internal wastegate... but it isn't worth the time, because i will go bnr stage 3 + microtech + supporting mods this winter, but i need to kill my maincat NOW because i think its clogging up (precat already hollowed up)... i only have 0,3bar boost sometimes, then sometimes 0,5 bar again as mentioned in another thread... and the exhaust sounds pretty much higher and isn't so loud as it should be...
i've searched but didn't found a thread with the same setup...
car is 99% stock...
will i hit fuelcut with these setup?
stock turbo
stock intake
stock precat hollowed out
stock maincat hollowed out
3" Dual Catback
if i hit fuelcut, will i hit it in every gear or only in 4.th and 5.th on a full highway pull?
anyone here with the same setup?
when i get a FCD, how high will my boost spike? any expiriences? dangerously high? and how much boost can i drive with the stock turbo, stock internal wastegate and stock AFM + ECU so that my car don't runs to lean?
i know, the best way will be to port the internal wastegate... but it isn't worth the time, because i will go bnr stage 3 + microtech + supporting mods this winter, but i need to kill my maincat NOW because i think its clogging up (precat already hollowed up)... i only have 0,3bar boost sometimes, then sometimes 0,5 bar again as mentioned in another thread... and the exhaust sounds pretty much higher and isn't so loud as it should be...
08-02-06, 02:33 AM
#2
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Originally Posted by SpAm@FC
hi stock precat hollowed out
stock maincat hollowed out
stock maincat hollowed out
I doubt porting the wastegate will bring it down enough.
Get an upgrade fuel pump.
Get an FCD.
Call it a day (unless you got more money?).
-Ted
08-02-06, 07:48 AM
#4
I'm a boost creep...
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With a stock J-spec DP (no pre-cat), no main cat (straight pipe), a dual 70mm catback and a pod filter, my car did not hit fuel cut. Since you have a stock intake and hollowed cats (which don't flow all that well), I'd be suprised if you hit fuel cut.
When I added a 2.5" downpipe/midpipe, I hit fuel cut. When the wastegaste was ported it stopped hitting fuel cut. When I added a 3" TID, I hit fuel cut again so I added a FD fuel pump and FCD.
When I added a 2.5" downpipe/midpipe, I hit fuel cut. When the wastegaste was ported it stopped hitting fuel cut. When I added a 3" TID, I hit fuel cut again so I added a FD fuel pump and FCD.
08-02-06, 08:40 AM
#5
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I had a bone stock 1987 Turbo II with punched out cats.
The rest of the exhaust was all stock.
It hit fuel-cut no problem.
In fact, it did it so good that I hit it twice on the freeway within 10 seconds and promptly blew the motor...at 70k miles.
-Ted
The rest of the exhaust was all stock.
It hit fuel-cut no problem.
In fact, it did it so good that I hit it twice on the freeway within 10 seconds and promptly blew the motor...at 70k miles.
-Ted
08-02-06, 12:14 PM
#6
I did it w/ stock main cat, stock catback and stock TID. I had only a downpipe and cone filter.
Usually ran about 6psi, 6.5psi on colder nights in the higher gears. I had no FCD. I was stupid.
Mine blew going onto a highway onramp, probably doing like 45-55mph or so and just boosting (not WOT).
Motor had 130k on it when it popped so I wasn't upset about it at all.
Get either a used FCD off the forum for sale section or send your ECU in for a Rtek 1.5 for $100. Don't blow your motor unless you have a rebuild one ready to go in\
I blew mine and have spent the past 10 months building my "super" motor and have been rx-7less the whole time. horrible
Usually ran about 6psi, 6.5psi on colder nights in the higher gears. I had no FCD. I was stupid.
Mine blew going onto a highway onramp, probably doing like 45-55mph or so and just boosting (not WOT).
Motor had 130k on it when it popped so I wasn't upset about it at all.
Get either a used FCD off the forum for sale section or send your ECU in for a Rtek 1.5 for $100. Don't blow your motor unless you have a rebuild one ready to go in\
I blew mine and have spent the past 10 months building my "super" motor and have been rx-7less the whole time. horrible
Last edited by Node; 08-02-06 at 12:16 PM.
08-02-06, 01:54 PM
#7
sooooooooooooo
i've hollowed out my maincat one hour ago... this shitty thing was 75% dead...
i have a boost around 0,5 bar = 7,3psi
when i pull trough all gears up to 110mph i have boost around 0,55bar = 8,08psi... fuelcut is at 8,5psi right?
outside temp was about 20°Celsius
so it works...
stock intake, hollowed out precat, hollowed out maincat, 3" dual catback
and, the best thing, the backfire is LOUD AS HELL... holyshit, that is soooooooo nice love it! 
but i'm confused about the dead engines...
why this should come only from one little fuelcut?
why i would be safer with an FCD? (i know, lean condition@fuelcut etc.)
to how much psi will the stock ecu+stock MAF work?? so how much boost can i run maximum with this setup + FCD? (don't want to raise the boost up, only want to be on the safe side)
i don't want to blow my engine because i've it since 2 months in the car
edit:
i think the engines blow up because the unrestrective intake? so that the turbo can spool on "both sides" (intake and exhaust) free as he want... !?
i've hollowed out my maincat one hour ago... this shitty thing was 75% dead...
i have a boost around 0,5 bar = 7,3psi
when i pull trough all gears up to 110mph i have boost around 0,55bar = 8,08psi... fuelcut is at 8,5psi right?
outside temp was about 20°Celsius
so it works...
stock intake, hollowed out precat, hollowed out maincat, 3" dual catback
and, the best thing, the backfire is LOUD AS HELL... holyshit, that is soooooooo nice
love it! but i'm confused about the dead engines...
why this should come only from one little fuelcut?
why i would be safer with an FCD? (i know, lean condition@fuelcut etc.)
to how much psi will the stock ecu+stock MAF work?? so how much boost can i run maximum with this setup + FCD? (don't want to raise the boost up, only want to be on the safe side)
i don't want to blow my engine because i've it since 2 months in the car
edit:
i think the engines blow up because the unrestrective intake? so that the turbo can spool on "both sides" (intake and exhaust) free as he want... !?
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08-02-06, 02:52 PM
#8
FCD will fake the computer into thinking you're running lower boost, and not hit fuel cut. some just lock the reading that the ECU is seeing just before it gets to fuelcut.
Personally, I would go w/ an Rtek 1.5. Its a chipped ECU that DELETES the fuel cut code. So your computer sees your real boost up until 14psi where the stock boost sensor can't read any higher. It also adds timing
But 8.5psi fuel cut? that means you're a series 5.......uhm, no Rtek for series 5 yet, so get either a used HKS F-Con (w/ FCD) from e-bay, or a FCD from someone.
listen to us, you WILL more than likely blow your car up if you play w/ it too much and have no FCD.
Both the exhaust side, and intake side can cause your boost to raise or be choked off. Its the boost, not wether you uncorked the intake side, and not the exhaust side or the other way around.
Don't keep driving your car around like this thinking itll be alright for 2 weeks until your FCD arrives, or even longer seeing how you're in austria.
-Ben Martin
*edit* and another thing, just because your boost gauge says 8.08psi, doesnt mean that your ECU is reading the exact same thing. Boost gauges can and are often times inaccurate, and also the source from where you T-ed it into can also cause variances.
Just remember when your car doesnt idle for **** and is hard to start that we told you so.........Don't be ignorant about fuel cut. It'll bite you in the ***. Rebuilds are expensive.
Personally, I would go w/ an Rtek 1.5. Its a chipped ECU that DELETES the fuel cut code. So your computer sees your real boost up until 14psi where the stock boost sensor can't read any higher. It also adds timing
But 8.5psi fuel cut? that means you're a series 5.......uhm, no Rtek for series 5 yet, so get either a used HKS F-Con (w/ FCD) from e-bay, or a FCD from someone.
listen to us, you WILL more than likely blow your car up if you play w/ it too much and have no FCD.
Both the exhaust side, and intake side can cause your boost to raise or be choked off. Its the boost, not wether you uncorked the intake side, and not the exhaust side or the other way around.
Don't keep driving your car around like this thinking itll be alright for 2 weeks until your FCD arrives, or even longer seeing how you're in austria.
-Ben Martin
*edit* and another thing, just because your boost gauge says 8.08psi, doesnt mean that your ECU is reading the exact same thing. Boost gauges can and are often times inaccurate, and also the source from where you T-ed it into can also cause variances.
Just remember when your car doesnt idle for **** and is hard to start that we told you so.........Don't be ignorant about fuel cut. It'll bite you in the ***. Rebuilds are expensive.
Last edited by Node; 08-02-06 at 02:55 PM.
08-02-06, 03:00 PM
#9
no, i'm series 4... but i've asked in antoher thread for the fuelcut... i've got the answer "8.6psi"
Rtek isn't a option for me because i want to go microtech this winter... so it's a waste of time and money...
i have a greddy boostgauge, T-ed it in the line which is going from the manifold to the boost sensor, just 2cm before the sensor
i was searching on ebay now... HKS FCD... will this FCD will be ok?
Rtek isn't a option for me because i want to go microtech this winter... so it's a waste of time and money...
i have a greddy boostgauge, T-ed it in the line which is going from the manifold to the boost sensor, just 2cm before the sensor
i was searching on ebay now... HKS FCD... will this FCD will be ok?
Last edited by SpAm@FC; 08-02-06 at 03:14 PM.
08-03-06, 04:10 AM
#15
Lives on the Forum
Originally Posted by SpAm@FC
but i'm confused about the dead engines...
why this should come only from one little fuelcut?
why this should come only from one little fuelcut?
-Ted
08-03-06, 05:44 AM
#16
I'm a boost creep...
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Originally Posted by Node
Don't be ignorant about fuel cut. It'll bite you in the ***. Rebuilds are expensive.
08-03-06, 09:27 AM
#17
Originally Posted by NZConvertible
I must be completely ignorant about fuel cut then, because I've hit it dozens of times and my engine is just fine. Plenty of others will tell you the same thing. Fuel cut does not blow engines. A FCD is not a safety device, it disables one.
i just slap a FCD in to be on the veryvery safe side... (of course i keep an eye on the boost level
)
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