New #'s for 68HTA. 374hp/359tq @ 21PSI
03-04-2010, 12:48 PM
#1
New Airboy #'s for 68HTA. 374hp/359tq @ 21PSI
Still haven't relocated MAF.. I did a little tweaking and managed to push the boost to 21 PSI.. CEL came on after 6100k rpm for MAF sensor high input, but still managed a clean pull out of it..
Maf is currently 73mm - going to move to 85mm sometime next week when I get a chance to weld the MAF flange onto the larger pipe..
Rough-ish tune.. The comparison is to the 19t that was in there before.. Both on e85, almost identical tunes..
19t @ 22-23 PSI
68HTA @ 21 PSI
IDC is hitting 97%....... I'm still about a half an (e85) AFR rich across the board.... If I manage to crack 400 WHP on these injectors they are going to be screaming.. Don't know what fuel pressure is like.. Only running a single Walbro 255HP.
Still plan on pushing the boost as high as these injectors will let me once MAF is relocated.. Hoping for around 28 PSI..
Maf is currently 73mm - going to move to 85mm sometime next week when I get a chance to weld the MAF flange onto the larger pipe..
Rough-ish tune.. The comparison is to the 19t that was in there before.. Both on e85, almost identical tunes..
19t @ 22-23 PSI
68HTA @ 21 PSI
IDC is hitting 97%....... I'm still about a half an (e85) AFR rich across the board.... If I manage to crack 400 WHP on these injectors they are going to be screaming.. Don't know what fuel pressure is like.. Only running a single Walbro 255HP.
Still plan on pushing the boost as high as these injectors will let me once MAF is relocated.. Hoping for around 28 PSI..
Last edited by Bouncer; 03-04-2010 at 10:15 PM.
03-04-2010, 12:53 PM
#2
Oh.. I think the torque and spool were adversely affected by running fairly rich (It got pretty fat lugging up from 2k rpm) .. Once the MAF is relocated and I go for the fine tune I expect a little better torque curve.
Even as it is. The 68HTA spools like a banshee for how much it can flow.. I REALLY like this turbo..
Even as it is. The 68HTA spools like a banshee for how much it can flow.. I REALLY like this turbo..
03-04-2010, 08:15 PM
#8
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wholy crap look at that??? thats looks just like my old tune! sweet fun to drive....
the heartbreaker........ I get tuned again next friday!
oh and it was good for a 12.4@117mph... at sac raceway with a 2.0 60ft
the heartbreaker........ I get tuned again next friday!
oh and it was good for a 12.4@117mph... at sac raceway with a 2.0 60ft
Last edited by boxerfxt; 03-04-2010 at 08:31 PM.
03-09-2010, 09:57 AM
#10
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1. What fuel calibration are you using for you lambda to AFR conversion? (gas or E85)
2. By "half an AFR rich" do you mean 0.5 less than your target on your scale defined in 1 or half of some undetermined range?
It's this whole mess that makes me just want to use lambda instead.
03-09-2010, 04:39 PM
#11
This still isn't clear.
1. What fuel calibration are you using for you lambda to AFR conversion? (gas or E85)
2. By "half an AFR rich" do you mean 0.5 less than your target on your scale defined in 1 or half of some undetermined range?
It's this whole mess that makes me just want to use lambda instead.
1. What fuel calibration are you using for you lambda to AFR conversion? (gas or E85)
2. By "half an AFR rich" do you mean 0.5 less than your target on your scale defined in 1 or half of some undetermined range?
It's this whole mess that makes me just want to use lambda instead.
But Im probably going to switch back to gas AFR's.. I'm too old to start changing things on myself..
It all really just boils down to what numbers you like to look at.. As long as you know what your target is you can use anything.. Im just too old to go switching over to Lambda.. My eyes have stared at AFR's for far too long.. In fact, I kept my wideband gauge on the column on Gas AFR's because I am used to scanning the WB out of the corner of my eye.. I tried calibrating it for e85 afr's but I had to focus on it and process what i was seeing to figure out if I was safe.. On gas AFR's I dont even have to look at it.. I can just see it in the bottom of my vision and if it crosses 12 or up into the teens my foot knows to shut-down without even thinking or really looking.. (well normally that woulda been 11, but it was easier to get used to a slight change in afr's than a large change)..
Meh, bottom line is know your target.. Doesn't matter what number you use.. One is no better or worse than another.. (Well except e85 AFR's on gauges because most dont display below the 7's - e85 can run into the 6's.. Not well, but it will run).
03-11-2010, 01:03 PM
#12
Maf Fixed... Still dialing it in, but the curves are looking a bit better now...
Numbers censored for the faint of heart - plus I don't believe Airboy interp's #'s up at this level.... (Plus this was just a plot of one of my maf scaling runs.. I had things a bit more conservative at the time..)
68HTA = the secks
WRX 16bit 300 g/sec limit = fail.. Oh well.. At least the MAF doesnt peg 5 volts anymore
Uhh.. Yeah.. Uhh.. the 68hta flows like a sob.
Numbers censored for the faint of heart - plus I don't believe Airboy interp's #'s up at this level.... (Plus this was just a plot of one of my maf scaling runs.. I had things a bit more conservative at the time..)
68HTA = the secks
WRX 16bit 300 g/sec limit = fail.. Oh well.. At least the MAF doesnt peg 5 volts anymore
Uhh.. Yeah.. Uhh.. the 68hta flows like a sob.
03-21-2010, 01:00 PM
#13
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I wonder what kind of power the 68HTA would make on a STI with 91 octane (With basic mods, turbo back exhaust, fuel pump, injectors and tune)
I've been looking on all the forums but seems like everyone is using 93 octane or E85.
I've been looking on all the forums but seems like everyone is using 93 octane or E85.
