87 t2 bnr stg 4 dyno
07-15-12, 03:30 AM
#1
87 t2 bnr stg 4 dyno
my 87 t2 s4 motor stock port ra super seals . rtek 720cc injectors x4 walbro 255 3 inch strait to dual n1s , front moutn , almuminum rad . e fan , premix and omp still intact . 292whp on accident leaning out 14psi , and 250whp on 6psi still leaning out a little bit . might be doing a rtek 2.1 and 1000 secondarys so i can do 16psi . segestions welcome . im not happy with it leaning out that bad. on 6psi or 7 psi afrs were at 12-13 to 7.5k .
07-15-12, 10:01 AM
#3
Car looks and sounds very nice!
Constructive criticism:
"1988 mazda rx-8" ?
Exhaust tips stock out too far
Numbers are low (if this is the 14.5 psi run). For reference a buddy recently did 300 @ on a stage 1 at 15psi. (granted, this was on an s5 t2 w/ mild SP it was also at roughly 6k rpm)
What afr were you seeing @ 14 psi?
The 2.1 would definitely make it easier and safer to get higher numbers. Data logging would make it much easier to figure out whats holding you back.
Constructive criticism:
"1988 mazda rx-8" ?
Exhaust tips stock out too far
Numbers are low (if this is the 14.5 psi run). For reference a buddy recently did 300 @ on a stage 1 at 15psi. (granted, this was on an s5 t2 w/ mild SP it was also at roughly 6k rpm)
What afr were you seeing @ 14 psi?
The 2.1 would definitely make it easier and safer to get higher numbers. Data logging would make it much easier to figure out whats holding you back.
07-15-12, 11:28 AM
#4
yea my buddy doesnt know much about cars. today im gonna do a compression test cause im sick of the hot starts everywere i go . and the afrs at 14psi was 16 pretty sure thats why it didnt go past 300 lol same thing with it on 7psi cuts me off in 4th gear pulls . so i gotta figure out if something else is up . and also which way is it to retard timing on the CAS if im infront of my car ?
07-15-12, 11:41 AM
#5
Another advantage of the 2.1 is adjusting the cranking fuel map, kiss hot start problems goodbye. 16afr 
just unhook your boost controller and run off the wastegate until you get your ecu situation sorted out. No need to mokey w/timing, just stop running boost levels your system can't support.
just unhook your boost controller and run off the wastegate until you get your ecu situation sorted out. No need to mokey w/timing, just stop running boost levels your system can't support.
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07-15-12, 12:08 PM
#8
A 255 would overrun the stock fpr and raise fuel pressure which would make out run rich, not lean.
That might explain the hour starts though; my car was all stock when I got it, except a walbro 255. It would shoot out a cloud of black smoke every time I started her up and would barely start when hot. I swapped it for an fd pump and all the problems went away.
That might explain the hour starts though; my car was all stock when I got it, except a walbro 255. It would shoot out a cloud of black smoke every time I started her up and would barely start when hot. I swapped it for an fd pump and all the problems went away.
07-15-12, 12:41 PM
#11
all i know is with the stock computer it was easier to start . all my fuel lines are new too with new clamps etc . we will see i just wantodo a compression test to make sure its not why its flodding out . sometimes it wont even start at all after getting it a little bit hot . but if you push start it starts right up
07-15-12, 02:11 PM
#14
Prob getting more fuel than needed, reasons unknown. Other than that yea could be low compression, but I really doubt it considering you said the problem wasn't prevalent obefore installing the rtek and the engine was just rebuilt. Something is causing your injectors to.spit out too much fuel on startup
in my opinion.
My old s4 na had problems Starting sometimes but it was random, could have been an electrical problem as my tps had a bad connection.
I think my coolant seals were slowly going that or one of my side housing had a small crack that slowly got bigger until it was actually smoking white smoke, but this was many miles after the rebuild, your compression should build up more and more as mileage is put on th engine unless its already completely broken in.
in my opinion.
My old s4 na had problems Starting sometimes but it was random, could have been an electrical problem as my tps had a bad connection.
I think my coolant seals were slowly going that or one of my side housing had a small crack that slowly got bigger until it was actually smoking white smoke, but this was many miles after the rebuild, your compression should build up more and more as mileage is put on th engine unless its already completely broken in.
07-15-12, 05:12 PM
#15
i messed with the CAS timing a lil . i let it get hot and tried to start it it actually started compared the other days . so yeah its adding too much fuel i think . still takes a bit of cranking tho but it starts lol . cant wait to ditch this rtek now so regret it .
07-17-12, 08:20 PM
#18
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yea my buddy doesnt know much about cars. today im gonna do a compression test cause im sick of the hot starts everywere i go . and the afrs at 14psi was 16 pretty sure thats why it didnt go past 300 lol same thing with it on 7psi cuts me off in 4th gear pulls . so i gotta figure out if something else is up . and also which way is it to retard timing on the CAS if im infront of my car ?
07-17-12, 08:24 PM
#19
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A 255 would overrun the stock fpr and raise fuel pressure which would make out run rich, not lean.
That might explain the hour starts though; my car was all stock when I got it, except a walbro 255. It would shoot out a cloud of black smoke every time I started her up and would barely start when hot. I swapped it for an fd pump and all the problems went away.
That might explain the hour starts though; my car was all stock when I got it, except a walbro 255. It would shoot out a cloud of black smoke every time I started her up and would barely start when hot. I swapped it for an fd pump and all the problems went away.
07-17-12, 08:58 PM
#21
damm WTF lol . well its leaning out at 6 psi now afrs are in 12s . so im gonan change these injecters . i know its not the pump . hot starts werent this hard with stock injectors . i felt a big dffrence when i had the walbro and stock injecters and ecu . so i know the pumps good . i dont know wat else to check . so im just gonna get 4 1000cc injectors . and rtek 2.1 i was hoping to keep it under 10psi with wat i have now but im too scared of it . and its not my wideband . which way is it to turn cas to retard?
07-18-12, 06:04 PM
#23
F**K THE SYSTEM!!
I had a bnr stage 3 on factory ecu w/ fcd and 720cc secondaries and fpr. AT 8 psi my car did 10.8-11.3 afrs.
I accidentally did 14-15 psi another time on same setup due to the "MAGIC INTAKE" and i read 11.7 afrs at 14 psi in second gear. Never did third.
Either way... something is off. Maybe your fuel pressure is to low?
I accidentally did 14-15 psi another time on same setup due to the "MAGIC INTAKE" and i read 11.7 afrs at 14 psi in second gear. Never did third.
Either way... something is off. Maybe your fuel pressure is to low?
07-18-12, 06:04 PM
#24
idled perfect!
anyways, don't discount things that were fine before. i would suspect the pump before the injectors, some walbros do not have the proper submersible hose and will develop leaks over time.
