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Old 02-03-2007, 11:36 AM   #1
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Default Highest boost on stock timing

Whats the highest boost you guys are running on stock timing. I want to run between 7-9 psi and would like to keep the timing stock. The turbo will obviously be intercooled. Do you think I can achieve my goal?
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Old 02-03-2007, 11:40 AM   #2
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I ran 15 psi with WI. and stock timming but had fuel issues 12-13 is fine.
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Old 02-03-2007, 11:42 AM   #3
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So I can run 12-13 psi with bigger injectors and an intercooler on stock timing on my 99? What fuel problems did you have?
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Old 02-03-2007, 11:54 AM   #4
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no, Magna failed to mention he is running water/meth injection

that is what allows him to do that...

and when his water/meth injection failed... so did his engine

heheh if you dont have WI, then u gotta have a timing controller
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Old 02-03-2007, 11:58 AM   #5
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Well ad to be fair if i woulda lifted i woulda been OK. just had to beat that damn mustang
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Old 02-03-2007, 11:59 AM   #6
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:gay: hahahahah woulda coulda shoulda At least u have a nice freash engine now
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Old 02-03-2007, 12:02 PM   #7
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I and a growing group of tuners believe WI is alot better than an IC etc but people are often scared by failures and refilling a tank etc. This is not true when you can get a FMIC to cool below ambient temprature lemme know until then, WI is it for me. My fuel problems where i was trying to run some 460's on the stock ecu with a safc i could get top end and idle but midrange and driveability was horrible so i went back to my 1.8 injectors and 110psi of fuel pressure. with 12 psi
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Old 02-03-2007, 12:05 PM   #8
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I was at 12 psi when the motor finally pooped out. Do to a massive knock event caused by a clogged injection nozzle. I stayed in and won but still i had to build a motor. I didnt notice alot until i blew my turbo oil seal and started smoking cause of the excess blowby a few weeks later. Then i ran compression and whoops well #2 should be better than 96 psi. So remove motor insert Wiesco pistons overbore etc reinstall now for the break in.
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Old 02-03-2007, 12:06 PM   #9
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WI or an IC is a must for more than 6 psi. With a IC past 8 psi you need a timming controller, or retarded timming.
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Old 02-03-2007, 12:09 PM   #10
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I am also planning on running 460's with a s-afc. Why couldnt you adjust the afc in order to get mid- range and drivability back
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Old 02-03-2007, 12:11 PM   #11
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nicely put
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Old 02-03-2007, 12:13 PM   #12
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Well I am also running a 1.6 my injectors are smaller than yours also i dont have a variable tps signal so i could only tune one map and my afm pretension, vs RPM. This + my real big walboro 255 putting my base fuel pressure at 10 psi over stock, And the fact that i dont run a Idle air controller either made it hard to get the fuel cruve right as 460's is more than twice the stock size.
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Old 02-03-2007, 12:29 PM   #13
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do you think i will be able to tune it properly
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Old 02-03-2007, 12:31 PM   #14
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With 400+cc injectors i dunno. 300's is easy 400's is up in the air not having WI to work around as it sprays Methanol as well as Water would make it easier but. all in all i would stick with what is proven first. Unless you wanna push things BTW you have pm.
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Old 02-03-2007, 02:02 PM   #15
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lol, magnam did you just reply to your own posts twice in a row?
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Old 02-03-2007, 02:07 PM   #16
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no i thought of something else and put it in a new post to save time. + i was IM ing AD at the time and he gave me the idea. :P
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Old 02-03-2007, 02:45 PM   #17
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Magna, how much frickin' water were you injecting at 12-13psi? Water injection can definitely, without a doubt, be more effective than just an intercooler alone, but I find it hard to believe you had no pinging at 12-13psi, stock timing, with only water injection!

Did you inspect the other, "good" pistons after your motor blew?
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Old 02-03-2007, 02:50 PM   #18
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yes and other than a little bit of scoring from know knock events they looked good. I was injecting about 19% by volume wich is more than the standard but when it all worked. IE i had enough fueling, and the WI was spraying i got no knock. Like i had said i have had knock but i went till i got knock and adjusted from there on fuel WI and boost until i was at optimal for my situation. I made alot of changes in my setup as it progressed, but every stage cept for the 460's, and the low impedance 300's was successfull and when tuned out did not knock. And drove just fine for me on my 30 mile one way commute even if i was in boost for 15 or so minutes each way. Heck i held boost for about 5 minutes straight at about 115 or so mph when i wan messin with a LT1 Impalla on a local rural highway. I left him by like 3 miles it was glorius.

Last edited by magnamx-5; 02-03-2007 at 02:50 PM. Reason: I knew you where hiding somewhere with that question.
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Old 02-03-2007, 02:53 PM   #19
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Knowing where the limits of your system are is a good thing once you find that you can go to a happy medium. If done correctly the results should be very nice.
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Old 02-03-2007, 06:02 PM   #20
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doesn't spraying that much water volume eat up valuble space for a place that would otherwise be air and fuel? Wouldn't that be somewhat less than optimal?
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