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View Full Version : How much boost on stock turbo and 91pump



getting_evo_soon
06-23-2009, 02:43 PM
hey guys, im sorry if this was answered before, but i didnt find a thread in this section (advanced tech and tuning)

My question is, you guys that run a basic stage 1 evo 9 (tbe, fuel pump, intake)
how much boost are you guys runing tuned on 91pump and stock turbo?
i was just wondering how much boost the evo 9 can take w/o any issue. with AFR around (11 - 11.5)

silvrEVOIXn818
06-23-2009, 02:48 PM
23-24 psi (@ peak) safely all day. But if you want a slight spike for TQ, Like I do, I shoot for 25 @ peak, and taper accordingly...

scumdog
06-23-2009, 02:49 PM
25

getting_evo_soon
06-23-2009, 03:00 PM
you guys have ZERO knocks thru the rpm range til redline ?
or gets some random 1-2 counts of knockS?

silvrEVOIXn818
06-23-2009, 03:07 PM
I see no more than 2 counts during spool/peak boost, and an occasional 3 count up top... I dont tune for 0 knock! I tune for 1-3 counts. If you never knock, your leaving usable power on the table...

Its not just about BOOST! Boost, AFR, and Timing, (and Mivec for IX's) need to be in harmony w/ each other.

leaveit2bevo
06-23-2009, 06:37 PM
you guys have ZERO knocks thru the rpm range til redline ?
or gets some random 1-2 counts of knockS?


IX turbo wont hold 23-25 psi to redline

turbolarry
06-24-2009, 09:12 AM
I dont tune for 0 knock! I tune for 1-3 counts. If you never knock, your leaving usable power on the table...


You are a brave man.

baylorar
06-24-2009, 10:41 AM
I see no more than 2 counts during spool/peak boost, and an occasional 3 count up top... I dont tune for 0 knock! I tune for 1-3 counts. If you never knock, your leaving usable power on the table...

Its not just about BOOST! Boost, AFR, and Timing, (and Mivec for IX's) need to be in harmony w/ each other.


Although the stock evo comes with knock, you'll never notice the power you 'lose' by getting rid of that knock. I tune my stuff to have 0 knock. It's so nice seeing a 24.5 psi spike and running through 4 gears with no knock.

Skiracer
06-24-2009, 10:46 AM
22 psi with 0-3 knocks of count for me

BenJ
06-24-2009, 02:32 PM
25 psi with no knock on 91 for me

getting_evo_soon
06-24-2009, 03:19 PM
25 psi with no knock on 91 for me

peak spike right ? taper to ?

BenJ
06-24-2009, 03:27 PM
tapers to 22-23

getting_evo_soon
06-24-2009, 03:38 PM
wow on stock turbo?
25peak tapers to 22-23@ redline?
using a mbc or gm3port?

pikadosboy
06-24-2009, 03:46 PM
all you mofos crack me up! boosting 25 psi without upgrade the head studs!

BenJ
06-24-2009, 03:48 PM
wow on stock turbo?
25peak tapers to 22-23@ redline?
using a mbc or gm3port?


Correct, Ported 9 Turbo with gm solenoid

BenJ
06-24-2009, 03:49 PM
all you mofos crack me up! boosting 25 psi without upgrade the head studs!


Just to note..I have upgraded headstuds.

getting_evo_soon
06-24-2009, 04:10 PM
all you mofos crack me up! boosting 25 psi without upgrade the head studs!

how much boost peak and redline would a evo 9 take w/o upgrading anything?? but still safe for a daily .

dastallion951
06-24-2009, 04:17 PM
25 to 21 on 03 turbo went strong for a year and a half lol but i had a few things done

dwnfdrknss
06-24-2009, 04:28 PM
:grin: 24psi at 11.3 afr. to 22psi at redline at ~11-10.9 afr. safe tune good power. on e85 im at 27psi. we'll finish ur tune later O0

silvrEVOIXn818
06-24-2009, 04:41 PM
I dont tune for 0 knock! I tune for 1-3 counts. If you never knock, your leaving usable power on the table...


You are a brave man.


lol. I should re-phrase that... I dont shoot for ANY knock, but 1-3 is acceptable. :)

getting_evo_soon
06-25-2009, 10:19 AM
u guys running 24-25 psi peak, and taper to 22-23 ...
did u guys upgrade injectors also ?

dp310
06-25-2009, 10:29 AM
Useless

Hahahaha jk

335eater
06-25-2009, 10:32 AM
sky is the limit with a meth kit :D

dastallion951
06-25-2009, 10:32 AM
yea of course kilum on the stocker i had 880 injectors n a walbro so i had enough fuel for it

getting_evo_soon
06-25-2009, 10:55 AM
Useless

Hahahaha jk

... welcome to the club kkkk

getting_evo_soon
06-25-2009, 10:56 AM
yea of course kilum on the stocker i had 880 injectors n a walbro so i had enough fuel for it

i have walbroo but dont have injectors =(

dp310
06-25-2009, 10:59 AM
im not in no club.....
but i jz had to stop by hahha

getting_evo_soon
06-25-2009, 11:21 AM
C00L :2funny: :2funny: :2funny:

Dr. Go
06-25-2009, 11:36 AM
I dont tune for 0 knock! I tune for 1-3 counts. If you never knock, your leaving usable power on the table...


You are a brave man.
funny thing is that my buddy with a S14 with a sr20det gets 30-50counts of knock at IDLE and WOT on a hot day he gets about 100-120counts

getting_evo_soon
06-25-2009, 11:41 AM
lol ...r u sure u didnt read an addition 0 ? kkk

335eater
06-25-2009, 10:28 PM
yea of course kilum on the stocker i had 880 injectors n a walbro so i had enough fuel for it

i have walbroo but dont have injectors =(

just get a meth kit O0

dastallion951
06-29-2009, 11:21 AM
u can get a meth kit for more safety from knock n detonation but not needed....good injectors pump n tune should be fine.

GilbertFlores
06-29-2009, 11:41 AM
I dont tune for 0 knock! I tune for 1-3 counts. If you never knock, your leaving usable power on the table...


You are a brave man.
funny thing is that my buddy with a S14 with a sr20det gets 30-50counts of knock at IDLE and WOT on a hot day he gets about 100-120counts
i think your adding some numbers in there because that much knock is unheard of on a motor that lives day after day....

if i wrong then correct me but it seems a little steep for such a thing.

now to the op.

tuned, with those mods, you can run 23-24psi spike without upgrading the injectors. if you want the 25psi mark and not to taper so much you will require some more fuel to be on the safe side and to help resist knock.

knock is never good but under 3 counts can be ok since the stock evo sometimes hits 7 counts up top. As far as headstuds go, you dont need them to much. 25psi on a stock evo turbo isnt as potent as 25psi on an fp red, or garret turbo. the pressure is there but the formation of power is weaker and wont cause head separation.

dont get me wrong, its possible....so dont think your always going to be fine, head studs are a nice cheap upgrade to help with safety but basically your looking at 22psi by redline.

get someone good to tune that because 22psi between tuners can make all the difference in power and torque. some run it safer, some more aggressive and some just like shit.... O0

RALLInspired
07-02-2009, 09:58 PM
just remember that injectors leave for more fuel up at the top therefore being safer and allowing for more timing possibly... imo u should get injectors when getting cams as well.

Looney Tuning
07-08-2009, 06:59 PM
Cars knock, deal with it. Combustion is not always perfect especially on 91 octane gas. The problem is not knock per se, but consistent repetitive knock. If everytime, you got random knock, you pull timing or richen the AFR or lower the boost, then you will end up with negative timing, 9:1 AFR, and 15 lbs of boost.

sxe_davexxx
07-09-2009, 06:38 PM
all you mofos crack me up! boosting 25 psi without upgrade the head studs!

Did your stock headstuds fail on you? I ask because I dont think I've heard of an instance where the stock head studs have failed, then again people don't share when they bust their motors...

frankd14321
07-10-2009, 07:25 PM
22psi with tbe, hfc, intake, licp. I tried 23 and I had to reduce timing to much. So i'm happy with the 22.

getting_evo_soon
07-10-2009, 08:30 PM
22psi with tbe, hfc, intake, licp. I tried 23 and I had to reduce timing to much. So i'm happy with the 22.

whats ur timing and afr with 22psi?

frankd14321
07-10-2009, 08:37 PM
When? At peak? The standard like 11. and timing is like 4-5 at peak. By redline. I am still tweaking the timing but it's around 10 now. AFR is 9.

RALLInspired
07-13-2009, 02:57 PM
When? At peak? The standard like 11. and timing is like 4-5 at peak. By redline. I am still tweaking the timing but it's around 10 now. AFR is 9.

afr is 9 @?? yea everycar like something different... its timing consuming but as long as the car and driver are happy thats all that matters.

EVO5JMA
09-08-2009, 07:59 AM
22-25 psi on stock 560cc injectors???

G20
09-08-2009, 11:12 AM
24.1 psi on 91 oct. according to Zeitronix. Stock turbo 05 MR with all supporting mods running testpipe, BuddyClub 272s, AEM intake, Precision 780cc, pump, mbc and self-tuned. Attached is the log showing the timings advance gradually from 4-5 to 15 max. Very conservative AFR up top. 333 whp and 325 tq according to MalibuJack Excel Dyno calc. This is not the best pull but just to show the 8 can boost a "little" higher than stock with mods.