16, 17, 18psi safe for 91 octane
01-14-08, 08:18 PM
#1
16, 17, 18psi safe for 91 octane
Yup... another "is ??psi safe" on 91 octane thread 
setup..
Pettit rebuilt 13B 3mm seals
Large streetport
1600 secondaries, stock primaries
all fuel/ignition supporting mods
T04R (T67) 1.00 A/R
HKS Standard wategate with 12psi spring vented to atmosphere
Apexi AVCR boost controller
Right now on 2nd and 3rd gear pulls i boost spike up until 1.22bar (17.5psi) around 50 times in a 3 month period. Wastegate lines arent setup right which cause the spike, but its not that bad. Everything holds up, see nothing wrong.
Now, since I boost spike to 17.5psi and so far it seems safe... should i go ahead and tune for 17psi or 16psi?
My FD is not a DD but at times used as one, so im looking for some reliablity.
Just want some discussion on 17-18psi on 91 octane with my setup... since everything has been good so far, and Steve Kan tunes for that, I dont want to blow something 6 months down the line.
setup..
Pettit rebuilt 13B 3mm seals
Large streetport
1600 secondaries, stock primaries
all fuel/ignition supporting mods
T04R (T67) 1.00 A/R
HKS Standard wategate with 12psi spring vented to atmosphere
Apexi AVCR boost controller
Right now on 2nd and 3rd gear pulls i boost spike up until 1.22bar (17.5psi) around 50 times in a 3 month period. Wastegate lines arent setup right which cause the spike, but its not that bad. Everything holds up, see nothing wrong.
Now, since I boost spike to 17.5psi and so far it seems safe... should i go ahead and tune for 17psi or 16psi?
My FD is not a DD but at times used as one, so im looking for some reliablity.
Just want some discussion on 17-18psi on 91 octane with my setup... since everything has been good so far, and Steve Kan tunes for that, I dont want to blow something 6 months down the line.
01-14-08, 09:37 PM
#2
GRINCHY
Join Date: Dec 2005
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I'm running 1.5 bar, 22psi on 90 octane but on a 8.5 comp rotor motor. I
run 11.5 plugs exclusively- I think this is the key. I do 4th gear pulls and
100+ mph runs almost daily= no probs for 2 years now. Car makes around
500+whp on a 67 mm[t04 z] turbo at this level. I think there is room for
more but this is more than one needs for the street- car is ridiculuosly
fast and more fun than my 10sec cobra mustang.
run 11.5 plugs exclusively- I think this is the key. I do 4th gear pulls and
100+ mph runs almost daily= no probs for 2 years now. Car makes around
500+whp on a 67 mm[t04 z] turbo at this level. I think there is room for
more but this is more than one needs for the street- car is ridiculuosly
fast and more fun than my 10sec cobra mustang.
01-14-08, 11:40 PM
#4
Original Gangster/Rotary!
iTrader: (213)
They're probably the NGK or Greddy racing plugs, 11.5.
This question comes down to two camps, and many will say they run lots of boost on pump gas.
I'm more conservative than that, and run as high as 19 psi on 93 octane only because of my Aquamist setup. Before that, I tried to stay around 15 psi on 93.
To answer the question in your subject, i'd say 'No.' Unless you have a damn good tuner and everything optimized, I'd say you're nuts to even try.
This question comes down to two camps, and many will say they run lots of boost on pump gas.
I'm more conservative than that, and run as high as 19 psi on 93 octane only because of my Aquamist setup. Before that, I tried to stay around 15 psi on 93.
To answer the question in your subject, i'd say 'No.' Unless you have a damn good tuner and everything optimized, I'd say you're nuts to even try.
01-15-08, 12:14 AM
#5
Im pretty sure Steve Kan is in the "damn good tuner" category (although theres a huge debate about that -__- ) he tends to stay on the conservative side.
Anyone got a link for the NGK racing 11.5's?
I think im just going to go with those and stay at 17psi.
btw.. Rich... what tires are you running in your sig? haha
Anyone got a link for the NGK racing 11.5's?
I think im just going to go with those and stay at 17psi.
btw.. Rich... what tires are you running in your sig? haha
01-15-08, 01:39 AM
#6
Just turn up the boost!
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Join Date: Jul 2007
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if it's spiking late then that's probably why everything has held together. coming after peak torque it's not so bad, but if you set it up to immediately hit and hold 17psi then things can be different. you can definitely tune to that and possibly be ok but there are a lot of factors in that to make it "reliable". hahaha
01-15-08, 03:58 PM
#7
Im pretty sure Steve Kan is in the "damn good tuner" category (although theres a huge debate about that -__- ) he tends to stay on the conservative side.
Anyone got a link for the NGK racing 11.5's?
I think im just going to go with those and stay at 17psi.
btw.. Rich... what tires are you running in your sig? haha
Anyone got a link for the NGK racing 11.5's?
I think im just going to go with those and stay at 17psi.
btw.. Rich... what tires are you running in your sig? haha
I ran 24PSI on 91 octane... engine ran strong, and didn't have any detonation issues until I hit a barrier which tanked the motor. However, I'll be using AI for this setup just for the added cooling properties, etc.
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01-15-08, 07:08 PM
#9
NYC's Loudest FD
I've done it on 93 octane here on the east coast for a long time, many miles with no problems with #9 plugs, it's all in the tuning. Go really rich with conservative timing for pump gas on the street to be safe.
01-15-08, 08:41 PM
#11
Steve is a super-conservative tuner, and I mean AFR's well, well, well over where they could be. The timing is never precise as well... but it's fairly close. Steve's a great guy... however, I was able to free up 50-75hp after altering his map and it was still rich and just as safe. Steve is VERY conservative...
I ran 24PSI on 91 octane... engine ran strong, and didn't have any detonation issues until I hit a barrier which tanked the motor. However, I'll be using AI for this setup just for the added cooling properties, etc.
I ran 24PSI on 91 octane... engine ran strong, and didn't have any detonation issues until I hit a barrier which tanked the motor. However, I'll be using AI for this setup just for the added cooling properties, etc.
This might give me incentive to run 18psi since Steve tunes conservative anyway.
and Rich... those look DAMN good... how'd you get the high gloss look especially on that actual tire (not the wall)
01-17-08, 01:53 AM
#17
01-21-08, 07:50 PM
#19
Original Gangster/Rotary!
iTrader: (213)
What boost are you shooting for?
Up to and around 1 bar, 9s are ok. approaching 20 psi, you'll want 10s. The higher the number, the quicker they'll foul on you during street driving.
I don't know the part #s offhand, you can order them from rx7.com, I'm pretty sure they stock them.
Up to and around 1 bar, 9s are ok. approaching 20 psi, you'll want 10s. The higher the number, the quicker they'll foul on you during street driving.
I don't know the part #s offhand, you can order them from rx7.com, I'm pretty sure they stock them.
01-21-08, 08:44 PM
#21
01-21-08, 10:28 PM
#23
To the OP:
I just chipped a seal running 17lbs @ 10.6 AFR's (SUPER RICH!) on 91. To keep the story short, don't go any higher than 16-17lbs on 91 unless you're running AI. Here's a post I did on another site if you want more info:
http://forums.thecarlounge.com/zerothread?id=3633017
Oh! Are you running on the 2 bar map sensor?
I just chipped a seal running 17lbs @ 10.6 AFR's (SUPER RICH!) on 91. To keep the story short, don't go any higher than 16-17lbs on 91 unless you're running AI. Here's a post I did on another site if you want more info:
http://forums.thecarlounge.com/zerothread?id=3633017
Oh! Are you running on the 2 bar map sensor?
01-22-08, 09:04 PM
#25
Street-port, 2mm (atkins), dowel pin-job, single turbine (.70Front, .68 rear), full 3" exhaust, greddy FMIC, PFC, koyo rad, MSD, all 9 plugs, GM 3-bar, etc... But I've learned my lesson, definitely no big boost on Cali fuel without my AI.
It's too much of a risk especially with the quality of Cali's 91 AKI to begin with 