gauidance w newest sr swap ///issues.... - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

jdo180 · 07-29-2011, 06:52 PM

the car has been running for 2days now
1990 hatch w/180sx 94-97 blacktop
fuel pressure is 43 w line off / 37ish with line on
timing set to15deg btdc
tps tested 100%
atp manual boost controller turn to the off positions
hks ssq ---releasing to the atmosphere
stock maf
vacuum set like this
bottom left throttle body -boost controller-wastgate
upper left throttle body-tee to boost gauge-bov hks ssq
upper right throttle body-small tee for ID/tube reduction-FPR
and the wiring was done by wiring specialties so thats not the issues

THe car started just fine after alil blue box removal and adjusting the TPS
I checked and adjusted the timing....
The car at this point idled great(well i dont have a working tach right now sohc car so should have a tach by monday or so) but sounded around 900-950ish....
After tuning in the fpr, checking operating temps, and doing 100's of double checks i took her for a drive .......................
Runs great as the RPM's climbed but at what i would say is anything after half throttle the engine stagnates aka feels like a KA !
No sputtering or stalling out but doesn't have the balls it should ???
Wanting to check for boost leaks within the FMIC piping but the boost gauge makes me think there is is no leak (no droping in pressure or jumping around)and all the piping is seated vary well with the couplers but i guess it cold be happening.
Power feels like it should when your not on the gas more than half way??

Trying to diagnoses problem i have:::
checked tps voltage open to close .good
readjusted FMIC piping 4 times. didn't help

weird things:::
<vacuum at idle 15ish remember running around 19-20 in the past..
<I have plugged the recri hole on the rubber turbo inletpipe along with the small hole for vacuum and the 3/4"ID hole on my apex intake..
And that's really it the car runs solid as long as i don't give more than 50% throttle and even then its OK but something is off??
What else can i do ???
Any ideas ???
planning further testing for boost leaks ,, would it be good to spray soapy water on fitting and check for movement when engine is reved up?

thanks

jdo180 · 07-30-2011, 09:51 AM

any ideas ??
testing for boost leaks today
what else can i do....

lance bradley · 07-30-2011, 07:17 PM

that vaccum idle is to high, but at wot, that really shouldn't do much to power. that is of course it is a vaccum leak and not something electrical. have you tried to feather the throttle one going past "halfway"?

jdo180 · 07-31-2011, 12:14 AM

found a few boost leaks with some soapy water-fix what i found
then saw the car was boosting around 7-10psi so read up a lil and decided to
bring the fuel pressure up to 53with line OFF...anyone contest??
now when i stand at the engine bay and rev the engine i can see that the fp does not fall below 3bars.. (before fp was droping a bit when reved)norm??
drove the car --feels alot better -- but still
going 60 in 3rd to keep the engine in boost i can hear what sounds like a boost leak after 6psi coming form passenger side maybe?-(hopeful not iacv)
but this coincides with a loss of boost seen via bG and loss of pull..
soo boost leak..?? pretty sure?
built boost leak tester today but the bike pump i was using was not working
soo buying tank tomorrow...
just figured i would have seen more jaring and bucking from the car via F-ed up afr??no??

07-29-2011, 06:52 PM	#1
jdo180 Zilvia Member Join Date: Nov 2004 Location: co Posts: 164 Trader Rating: (3) Feedback Score: 3 reviews	gauidance w newest sr swap ///issues.... the car has been running for 2days now 1990 hatch w/180sx 94-97 blacktop fuel pressure is 43 w line off / 37ish with line on timing set to15deg btdc tps tested 100% atp manual boost controller turn to the off positions hks ssq ---releasing to the atmosphere stock maf vacuum set like this bottom left throttle body -boost controller-wastgate upper left throttle body-tee to boost gauge-bov hks ssq upper right throttle body-small tee for ID/tube reduction-FPR and the wiring was done by wiring specialties so thats not the issues THe car started just fine after alil blue box removal and adjusting the TPS I checked and adjusted the timing.... The car at this point idled great(well i dont have a working tach right now sohc car so should have a tach by monday or so) but sounded around 900-950ish.... After tuning in the fpr, checking operating temps, and doing 100's of double checks i took her for a drive ....................... Runs great as the RPM's climbed but at what i would say is anything after half throttle the engine stagnates aka feels like a KA ! No sputtering or stalling out but doesn't have the balls it should ??? Wanting to check for boost leaks within the FMIC piping but the boost gauge makes me think there is is no leak (no droping in pressure or jumping around)and all the piping is seated vary well with the couplers but i guess it cold be happening. Power feels like it should when your not on the gas more than half way?? Trying to diagnoses problem i have::: checked tps voltage open to close .good readjusted FMIC piping 4 times. didn't help weird things::: <vacuum at idle 15ish remember running around 19-20 in the past.. <I have plugged the recri hole on the rubber turbo inletpipe along with the small hole for vacuum and the 3/4"ID hole on my apex intake.. And that's really it the car runs solid as long as i don't give more than 50% throttle and even then its OK but something is off?? What else can i do ??? Any ideas ??? planning further testing for boost leaks ,, would it be good to spray soapy water on fitting and check for movement when engine is reved up? thanks

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07-30-2011, 09:51 AM	#2
jdo180 Zilvia Member Join Date: Nov 2004 Location: co Posts: 164 Trader Rating: (3) Feedback Score: 3 reviews	any ideas ?? testing for boost leaks today what else can i do....

07-30-2011, 07:17 PM	#3
lance bradley Join Date: Jul 2011 Location: new mexico Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	that vaccum idle is to high, but at wot, that really shouldn't do much to power. that is of course it is a vaccum leak and not something electrical. have you tried to feather the throttle one going past "halfway"?

07-31-2011, 12:14 AM	#4
jdo180 Zilvia Member Join Date: Nov 2004 Location: co Posts: 164 Trader Rating: (3) Feedback Score: 3 reviews	found a few boost leaks with some soapy water-fix what i found then saw the car was boosting around 7-10psi so read up a lil and decided to bring the fuel pressure up to 53with line OFF...anyone contest?? now when i stand at the engine bay and rev the engine i can see that the fp does not fall below 3bars.. (before fp was droping a bit when reved)norm?? drove the car --feels alot better -- but still going 60 in 3rd to keep the engine in boost i can hear what sounds like a boost leak after 6psi coming form passenger side maybe?-(hopeful not iacv) but this coincides with a loss of boost seen via bG and loss of pull.. soo boost leak..?? pretty sure? built boost leak tester today but the bike pump i was using was not working soo buying tank tomorrow... just figured i would have seen more jaring and bucking from the car via F-ed up afr??no??