less boost on the lex afm??
- Thread starter suprafanatic
- Start date
bountykilla0118;1075365 said:
Without addressing your point, let's use some common sense. He said he's going to have 550cc injectors in a week. Having the injectors is going to give him a bit of cushion and make it safer while he's tuning it and give him a little more capacity in operation.
Whether or not you think the 550's are necessary - if he has them coming, the smart thing would have been to wait for them. Even if I agree that the ability to run 440's safely can be completely determined by the quality of the tuning (which I don't based on the boost levels being talked about) - I find it very hard to believe someone who makes consistent bad decisions to achieve such a tune.
There is no point to installing the lex by itself if you have 550's on the way. There is certainly no reason to turn up the boost until you install the larger injectors. I still don't understand exactly what has been done to the filter - but it sure doesn't sound like the right way to fix any problem.
well my car aparently runs alittle different no one else has had that happen with the air filter, with the stock afm and filter on my car would hit fuel cut at like 5-6psi..with it gapped i could run up to 17psi... it was doing the same thing with the lex afm and filter so i gapped it to... and how can you say regardless of what your wideband says? are you saying the widebands are no good anymore for reading AFR's?????
well nothing else fixes my fuel cut problems,, iv tried everything and it took that simple gap to fix the fuel cut.. the shop even said at one point with the filter on it seemed like there was to much of a restriction to the afm... im not going to leave it like that, im going to find a high flowing filter or something along those lines. as for boost and lex im turning it down till i get the 550s
What filter are you running, and how do you have it attached? I have a hard time imagining that it's more restrictive than the stock airbox... Is this 'gap' that you are referring to before or after the AFM?
Did you check codes when you had early cut on stock AFM and stock injectors. There does seem to be some sort of problem that you should fix before you mod any further and increase boost
It's right where the filter attaches to the AFM, BEFORE it measures the air coming in.
I have a dyno chart showing my AFRs at 17PSI on 440s, they were leaning out there (starting to hit 13). They are fine at 15PSI (in the low to mid twelves), but I also have an AFPR and I'm running a bit over stock FP. A calculator here shows that 15 PSI is between 83% and 90% duty cycle at the factory redline. Pushing it, yes, but not maxed out. However, recalculate for 17PSI, and you find that you are in fact OVER 100% at factory redline. Nate was still running rich at 18PSI, so he clearly does not have 440s. At 12PSI, 440s would be right around 80%, most consider this to be the maximum duty cycle that is safe. Again, I would like to add that I am fully convinced that Nate is not on 440s, because his injectors would have to be working something like 120% at 18PSI just to not go boom, let alone run rich (he said he was around 10.5 IIRC)
I have a dyno chart showing my AFRs at 17PSI on 440s, they were leaning out there (starting to hit 13). They are fine at 15PSI (in the low to mid twelves), but I also have an AFPR and I'm running a bit over stock FP. A calculator here shows that 15 PSI is between 83% and 90% duty cycle at the factory redline. Pushing it, yes, but not maxed out. However, recalculate for 17PSI, and you find that you are in fact OVER 100% at factory redline. Nate was still running rich at 18PSI, so he clearly does not have 440s. At 12PSI, 440s would be right around 80%, most consider this to be the maximum duty cycle that is safe. Again, I would like to add that I am fully convinced that Nate is not on 440s, because his injectors would have to be working something like 120% at 18PSI just to not go boom, let alone run rich (he said he was around 10.5 IIRC)
Is he refering the adjustment screw? I had the same problem with my setup back the screw almost all the way out ...... I drilled the stock one to get to the screw but the lex afm came already exposed.
Quin what was your fuel pressure at the time..... More psi less duty cycle on the injectors up to a point but I cant remember what the exact number was for the max fuel pressure
Quin what was your fuel pressure at the time..... More psi less duty cycle on the injectors up to a point but I cant remember what the exact number was for the max fuel pressure
I think it's 50, I'm 100% sure. Car isn't running or I'd check it for you. No, he literally means where you attach the filter on the front of the AFM, he doesn't tighten his filter down all the way.
No, it sneaks in more unfiltered air. I have no idea how it helps anything, but it does on his car :dunno:
Quin;1075472 said:
I concur, I'm having a hard time believing they are stockers.
Just for shits and giggles, you may want to send those off to be cleaned and flowed, costs aroung $50 at some places, there is a link on this site to one of the best/cheapest persons to send them to. If they are indeed larger, sell 'em.
starscream5000;1075507 said:I concur, I'm having a hard time believing they are stockers.
Just for shits and giggles, you may want to send those off to be cleaned and flowed, costs aroung $50 at some places, there is a link on this site to one of the best/cheapest persons to send them to. If they are indeed larger, sell 'em.
If they are larger, save the money you were gonna spend on 550's. Use some of that money to have them cleaned and flowed. This could explain why your car was stronger than the average stock Supra last year in Chicago.
contact Tim at cleaninjectors.com. He only charges $25 to flow new ones, but I don't know cleaning fees.
ya its K&N.. how do you clean them? and yes the gap is between filter and afm, so pre afm.... the only thing it does is make it less restrictive, the turbo can suck air in alot easier,, and for some reason this works on my car, like Quin said. it is wierd i know but it works.. is there a way just by looking at the injectors to tell if there stock ones? and for those of you craping your pants about all this, iam going to turn the boost down and run it safe till i do get the injectors in. lol...... also like ForcedTorque was saying my car last year dyno'd 243hp stock.. not sure if that has anything to do with the injectors or not.
noah89t
get naked & boost a supra
suprafanatic;1075710 said:
you need a filter recharge kit for the K&N filter. they are about 10 dollars
http://www.knfilters.com/clningacc.htm
i find it very weird that if you tighten your filter down, you can only boost 5-7psi. bit if you don't know how to clean your filter, then i guess it is not hard to believe. like scott said, get your injectors checked out before you spend the money on new ones. if you take them out, they may have someone's brand name on them. there will be a part number on them though.
you don't want shit sucked into your intake system that is not filtered.
suprafanatic;1075238 said:
You shouldn't thank people that give you bad advice.
Waiting for the next BHG thread...
bountykilla0118;1075365 said:
Bounty, im not going against anything you say, but just keep in mind that 440's can varify.
Stock 440's that have been in the car for 100K miles are different from 440's that were jsut cleaned and tested.
Ive run 440's at higher boost on a 57 trim. It can be done. Is it smart, no. I added meth
it holds true to a point. look at RX7's that run 1600cc injectors, will they make 1600hp? more than likely not.
really 90% is the MAX an injector should be run at brand new, after so many miles 80% is probably a better number to use.
80% x 440 = 352
Remember that is considering peak efficiency. It is a general rule of thumb but doesn't mean it's a 100% set in stone rule.
really 90% is the MAX an injector should be run at brand new, after so many miles 80% is probably a better number to use.
80% x 440 = 352
Remember that is considering peak efficiency. It is a general rule of thumb but doesn't mean it's a 100% set in stone rule.