begi s3 / gt2860rs crew: what AR turbine did they send you?
#1
Tour de Franzia
Thread Starter
iTrader: (6)
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,085
Total Cats: 375
begi s3 / gt2860rs crew: what AR turbine did they send you?
I was talking to someone about how my car was making only 5psi at 4k rpm, then 7psi at 5500, and he thinks the turbine housing is too large.
What AR do you have, and at what RPM does it make 10psi? I think I have the .86 and want to change that.
Thanks.
pics for the hell of it:
What AR do you have, and at what RPM does it make 10psi? I think I have the .86 and want to change that.
Thanks.
pics for the hell of it:
#3
Tour de Franzia
Thread Starter
iTrader: (6)
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,085
Total Cats: 375
could having the wastegate adjusted pretty far out have that dramatic of an affect on spool? With the wastegate disconnected, the motor is stronger than the 1.6 ever was, even with the lowered compression.
#7
Tour de Franzia
Thread Starter
iTrader: (6)
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,085
Total Cats: 375
I don't know what's up with the #'s, I'll have a friend go look at it. Any chance a "tuned" spark map will give me 1000rpm better spoolage? What about having the wastegate backed way off? I guess I need to go home, unplug the hose, and see how early it makes target boost. I think with the 1.9l, 3" exhuast, and standard DIY spark map I should be spooling sooner.
If I have to get a smaller turbine housing...then whatever, but I'm getting tired of hemorrhaging money.
#9
Tour de Franzia
Thread Starter
iTrader: (6)
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,085
Total Cats: 375
Is this unreasonable? There are other variables I must address first though...like snugging up the wastegate actuator and pulling the vac hose to the spring, then adjusting spark. I'm about to go get the car and just leave it at BEGi. Time > money.
#11
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,501
Total Cats: 4,080
you have a 1.9L motor correct?
The same volume of air is always getting ingested regardless of RPM and boost pressure.
The Corrected Gas Turbine Flow is the amount of this air that moves through the motor during a specific time period. (lb/min)
if you calculate the amount of Volume Air Flow or Gas Turbine Flow in this case, it would be easier to read the turbine efficiency plot based on the demands of your motor.
VAF = (CI/1728) x (RPM/2) x VE
116/1728 x 7000/2 = 235 CFM (16.2 lb/min)
so maybe you want to draw a line up from 2PR and over from 16 lb/min and see where you end up. Then say, hmmmm the max efficiency of the turbine in a .63 A/R housing is just above the volume I displace...so the .86 may be too large for what I need.
#12
Tour de Franzia
Thread Starter
iTrader: (6)
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,085
Total Cats: 375
The smaller housing is 74.4% the size of the larger one. I'm apparently talking out of my ***, so correct me. I read till 1:30 last night trying to figure out how much work I have to do when I get back home in January.
#13
Tour de Franzia
Thread Starter
iTrader: (6)
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,085
Total Cats: 375
you have a 1.8L motor correct?
The same volume of air is always getting ingested regardless of RPM and boost pressure.
The Corrected Gas Turbine Flow is the amount of this air that moves through the motor during a specific time period. (lb/min)
if you calculate the amount of Volume Air Flow or Gas Turbine Flow in this case, it would be easier to read the turbine efficiency plot based on the demands of your motor.
VAF = (CI/1728) x (RPM/2) x VE
110/1728 x 7000/2 = 223 CFM (15.4 lb/min)
so maybe you want to draw a line up from 2PR and over from 16 lb/min and see where you end up.
The same volume of air is always getting ingested regardless of RPM and boost pressure.
The Corrected Gas Turbine Flow is the amount of this air that moves through the motor during a specific time period. (lb/min)
if you calculate the amount of Volume Air Flow or Gas Turbine Flow in this case, it would be easier to read the turbine efficiency plot based on the demands of your motor.
VAF = (CI/1728) x (RPM/2) x VE
110/1728 x 7000/2 = 223 CFM (15.4 lb/min)
so maybe you want to draw a line up from 2PR and over from 16 lb/min and see where you end up.
So, wtf do I need to do since you are an engineer and I'm a beuracrat? Switch to a 2560, or get a smaller turbine housing? I'd still like to get an answer from the DP owners here. I just want to drive my ******* car, not the rental G6.
#15
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,501
Total Cats: 4,080
all i was saying is that you posted the turbine efficiency plot without knowing how to read it. And im not an engineer, just an artist.
Was this just with a line from the turbo to the wastegate can?
Was this just with a line from the turbo to the wastegate can?
#17
Tour de Franzia
Thread Starter
iTrader: (6)
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,085
Total Cats: 375
If yes, then my pants are getting tight and I can rest easy with less work to do on my car.
#20
Tour de Franzia
Thread Starter
iTrader: (6)
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,085
Total Cats: 375
thanks brain. I guess I need to get the car tuned, then cry like a ------. I'm going to snug up the wastegate.
Is there any chance that adding a little 3psi wastegate would help spool, and not overboost?
cool. This motor should be blowing the tires off then.
Time to get the miata and drop it off at the dyno. Damn business travel job, lol.
Is there any chance that adding a little 3psi wastegate would help spool, and not overboost?
Time to get the miata and drop it off at the dyno. Damn business travel job, lol.