Ideas
Senior Member
Joined: 08-13-05
Posts: 5,733
Likes: 1
From: the glove
I dunno about the piston slap though. I dont want any of that. lets got back to this compressor surge you talked about. your not honestly blaming it on your intake, are you?
I'm trying to impress the OP here :P
Senior Member
Joined: 07-25-08
Posts: 12,450
Likes: 6
From: Florida
Be prepared .... :puts on ear muffs to protect ears:
You can literally hear your car coming from a mile away, it's THAT loud
I had my buddy drive my car and WOT at a specific location from my house and I could hear it from 3/4 mile away
He also WOT as he drove by my street ; my response was "YYYEEEEAHHHHH" but long and drawn out (and not a good "yeah")
You can literally hear your car coming from a mile away, it's THAT loud
I had my buddy drive my car and WOT at a specific location from my house and I could hear it from 3/4 mile away
He also WOT as he drove by my street ; my response was "YYYEEEEAHHHHH" but long and drawn out (and not a good "yeah")
Senior Member
Joined: 08-13-05
Posts: 5,733
Likes: 1
From: the glove
Extra suction head is the cause I believe. The AEM intake is the only intake that causes it and it is also the only intake that relocated the MAF a ton further from the turbo. I believe that is the main issue with its design The fueling is spot on. LTFT were 0.0 to -0.2. STFT were -2 to +2. Stock cat heating tables stock idle. I tried exactly what you suggested with the cam tables before but it made the car run like it had cam lope instead of compressor surge. Neither is acceptable to me. Oh, and Bryan she is not that easily impressed trust me.
so, you'll have to excuse the intake ignorance but the last i messed with an LNF intake was removing it due to me not wanting to fight the fueling issues.
have you verified its surge and not a compressor choke? what boost levels does it occur with?
for it to be a flow-head issue, to me, that signals a restrictive intake design / poor filter flow. mostly filter as i've had this same issue on my old 30r. the filter was not big enough to move the air mass needed with out massive vacuum and that choked out the comp wheel and even pulled oil thru the seals (it takes a vary small amount of vacuum to do so)
have you done any inspection to back this idea, or is it just a thought? i'm purely curious here.
i'd did a quick image search for the intake, and now that i've seen it(vary little to be seen) i'd quickly question the MASSIVE silicone pieces rigidity under vacuum.
any intake with that mass amount of convoluted, multi-diameter bends is going to have a large pressure drop across it. thus more and more vacuum at the inlet.
it could vary well be a REAL problem as i doubt they tested on a tuned car, thus much lower flow rates.
the maf being located further from the filter allows for some tanginal(sp?, not pulling out my dynamics book) air flow to "straighten" its self out before it hits the MAF.
to be completely honest, I've got an idea in my head for an intake from the devel days. Its NOT pretty, its NOT shiny, but i know it works. if you'd like to try it, PM me.
as a whole this should become a PM. feel free if you want to continue this. I wouldn't mind solving some issues with a person who doesn't phrase there posts like a 14yr old.
Senior Member
Joined: 07-25-08
Posts: 12,450
Likes: 6
From: Florida
ah, turbo tech. this is the stuff i like.
so, you'll have to excuse the intake ignorance but the last i messed with an LNF intake was removing it due to me not wanting to fight the fueling issues.
have you verified its surge and not a compressor choke? what boost levels does it occur with?
for it to be a flow-head issue, to me, that signals a restrictive intake design / poor filter flow. mostly filter as i've had this same issue on my old 30r. the filter was not big enough to move the air mass needed with out massive vacuum and that choked out the comp wheel and even pulled oil thru the seals (it takes a vary small amount of vacuum to do so)
have you done any inspection to back this idea, or is it just a thought? i'm purely curious here.
i'd did a quick image search for the intake, and now that i've seen it(vary little to be seen) i'd quickly question the MASSIVE silicone pieces rigidity under vacuum.
any intake with that mass amount of convoluted, multi-diameter bends is going to have a large pressure drop across it. thus more and more vacuum at the inlet.
it could vary well be a REAL problem as i doubt they tested on a tuned car, thus much lower flow rates.
the maf being located further from the filter allows for some tanginal(sp?, not pulling out my dynamics book) air flow to "straighten" its self out before it hits the MAF.
to be completely honest, I've got an idea in my head for an intake from the devel days. Its NOT pretty, its NOT shiny, but i know it works. if you'd like to try it, PM me.
as a whole this should become a PM. feel free if you want to continue this. I wouldn't mind solving some issues with a person who doesn't phrase there posts like a 14yr old.
so, you'll have to excuse the intake ignorance but the last i messed with an LNF intake was removing it due to me not wanting to fight the fueling issues.
have you verified its surge and not a compressor choke? what boost levels does it occur with?
for it to be a flow-head issue, to me, that signals a restrictive intake design / poor filter flow. mostly filter as i've had this same issue on my old 30r. the filter was not big enough to move the air mass needed with out massive vacuum and that choked out the comp wheel and even pulled oil thru the seals (it takes a vary small amount of vacuum to do so)
have you done any inspection to back this idea, or is it just a thought? i'm purely curious here.
i'd did a quick image search for the intake, and now that i've seen it(vary little to be seen) i'd quickly question the MASSIVE silicone pieces rigidity under vacuum.
any intake with that mass amount of convoluted, multi-diameter bends is going to have a large pressure drop across it. thus more and more vacuum at the inlet.
it could vary well be a REAL problem as i doubt they tested on a tuned car, thus much lower flow rates.
the maf being located further from the filter allows for some tanginal(sp?, not pulling out my dynamics book) air flow to "straighten" its self out before it hits the MAF.
to be completely honest, I've got an idea in my head for an intake from the devel days. Its NOT pretty, its NOT shiny, but i know it works. if you'd like to try it, PM me.
as a whole this should become a PM. feel free if you want to continue this. I wouldn't mind solving some issues with a person who doesn't phrase there posts like a 14yr old.
Senior Member
Joined: 08-13-05
Posts: 5,733
Likes: 1
From: the glove
Well. It seems like compressor choke actually. It occurs in vac not boost. It does not surge with the silicone piece attached to the stock airbox. I will PM you more details later. Glad to see someone else hates tuning these car with intakes. Trying to get the fueling perfect is very difficult on this car.
this occurrence in vac only has my gears turning.....hmmmmmm
Senior Member
Joined: 08-13-05
Posts: 5,733
Likes: 1
From: the glove
well done guys. It seems that it took a bit longer then exspected, no?
these cars are always like that. any who, glad its done, glad i could help.
CA needs to run 93/94 oct like we do here, my god your missing out on the fun!!!!
these cars are always like that. any who, glad its done, glad i could help.
CA needs to run 93/94 oct like we do here, my god your missing out on the fun!!!!
Senior Member
Joined: 07-25-08
Posts: 12,450
Likes: 6
From: Florida
