Zombie's new bigger rear mount turbo, now with 1.25 a/r action!
02-15-2009, 01:15 PM
#1
Zombie's new bigger rear mount turbo, now with 1.25 a/r action! Cliffs at the bottom for you lazy bastards!
So I sent my turbo off to Forced Inductions to have them perform their sorcery on my ST80 and here is what I got.
BEFORE (ST80):
80mm comp wheel
Standard cover
83mm turbine wheel
1.00 a/r
AFTER (SX80):
80mm comp wheel (same as before)
Race cover
87mm turbine wheel
1.25 a/r
When I got the turbo back and pulled it out of the box though I might have bitten off more than I could chew. The turbine housing was quite large compared to the old 1.00 a/r so I was concerned about lag since I like to street drive the car.
Here is a pic so you can see what i'm talking about.
Fast forward to last night, got the turbo installed with some help and took her for a drive. This was the ONLY change made to the car. On it's maiden voyage I was shocked to find out that the turbo not only spooled OK, but that it was pretty much identical in spool up to the old turbo! I don't know how a turbo with a 25% larger a/r and a 4mm bigger turbine wheel can spool the same, but I'm quite happy. I had to go to the data logs to find any difference in spool up. Looks like the SX80 is 0.25 seconds slower to reach full boost over the ST80 so there is some additional lag, but nothing I noticed on the initial drive.
I also had an OH ****! moment on the first pull because the boost spiked! I had my controller set for 16psi from my last track outing and I watched the boost gauge jump to 19psi! I have my fuel map set to dump fuel over 18psi for safety incase I get a spike like that so all was ok. My friend riding with me said the AFR was 12.2 on the spike. Just by swapping in this turbo I gained 3psi of boost on the same controller settings, what a pleasant surprise. Need to do some more testing to verify there is a gain though.
Turned the controller down so it held 16psi and did another pull to verify a/f. Car was running around 12.0 now and it was tuned for 11.0. Data logs show I need to add more fuel. Duty cycle on the old turbo at 16psi was around 65-67% and this one is up to 70-72% and still need more fuel. Data logs from the 12psi boost level show similar gains.
Two step and trans brake testing showed this spools the same as the old turbo as well. If I foot brake the car to 0 psi against the converter (4000 rpms) and then grab the trans brake / 2 step (set at 3800) I get 5 psi in less than 1 second.
Can't wait to see if I realized gains at the track.
Things I'll be testing in the future will be either getting the turbine housing ceramic coated to hold more heat and the Sound Performance Quick Spool. I have to get dyno and track results from this setup first though.
*Cliffs*
Installed new bigger badder version turbo, feared it was be laggy, found out it wasn't laggy, needed to add more fuel at same boost levels.
So I sent my turbo off to Forced Inductions to have them perform their sorcery on my ST80 and here is what I got.
BEFORE (ST80):
80mm comp wheel
Standard cover
83mm turbine wheel
1.00 a/r
AFTER (SX80):
80mm comp wheel (same as before)
Race cover
87mm turbine wheel
1.25 a/r
When I got the turbo back and pulled it out of the box though I might have bitten off more than I could chew. The turbine housing was quite large compared to the old 1.00 a/r so I was concerned about lag since I like to street drive the car.
Here is a pic so you can see what i'm talking about.
Fast forward to last night, got the turbo installed with some help and took her for a drive. This was the ONLY change made to the car. On it's maiden voyage I was shocked to find out that the turbo not only spooled OK, but that it was pretty much identical in spool up to the old turbo! I don't know how a turbo with a 25% larger a/r and a 4mm bigger turbine wheel can spool the same, but I'm quite happy. I had to go to the data logs to find any difference in spool up. Looks like the SX80 is 0.25 seconds slower to reach full boost over the ST80 so there is some additional lag, but nothing I noticed on the initial drive.
I also had an OH ****! moment on the first pull because the boost spiked! I had my controller set for 16psi from my last track outing and I watched the boost gauge jump to 19psi! I have my fuel map set to dump fuel over 18psi for safety incase I get a spike like that so all was ok. My friend riding with me said the AFR was 12.2 on the spike. Just by swapping in this turbo I gained 3psi of boost on the same controller settings, what a pleasant surprise. Need to do some more testing to verify there is a gain though.
Turned the controller down so it held 16psi and did another pull to verify a/f. Car was running around 12.0 now and it was tuned for 11.0. Data logs show I need to add more fuel. Duty cycle on the old turbo at 16psi was around 65-67% and this one is up to 70-72% and still need more fuel. Data logs from the 12psi boost level show similar gains.
Two step and trans brake testing showed this spools the same as the old turbo as well. If I foot brake the car to 0 psi against the converter (4000 rpms) and then grab the trans brake / 2 step (set at 3800) I get 5 psi in less than 1 second.
Can't wait to see if I realized gains at the track.
Things I'll be testing in the future will be either getting the turbine housing ceramic coated to hold more heat and the Sound Performance Quick Spool. I have to get dyno and track results from this setup first though.
*Cliffs*
Installed new bigger badder version turbo, feared it was be laggy, found out it wasn't laggy, needed to add more fuel at same boost levels.
02-16-2009, 06:50 AM
#4
amazing results Zombie!
jsut thinking out loud, could the larger turboine wheel enable the same amount of gas to produce more torque on the turbine shaft???? just thinking. lol
be intresting to see how much more power you are making.
Chris.
jsut thinking out loud, could the larger turboine wheel enable the same amount of gas to produce more torque on the turbine shaft???? just thinking. lol
be intresting to see how much more power you are making.
Chris.
02-16-2009, 11:28 AM
#11
Just worked the math based off my injector duty cycle logs.
At 16psi it looks like I have added about 5% more fuel so far and it probably needs another 1% which works out to around an 80 HP gain.
I'll try to get some pictures of my car this week so people can see it installed. Vids will happen when I can get a volunteer to ride shotgun... or just have my friend drive while I video.
At 16psi it looks like I have added about 5% more fuel so far and it probably needs another 1% which works out to around an 80 HP gain.
I'll try to get some pictures of my car this week so people can see it installed. Vids will happen when I can get a volunteer to ride shotgun... or just have my friend drive while I video.
02-16-2009, 02:09 PM
#12
Just worked the math based off my injector duty cycle logs.
At 16psi it looks like I have added about 5% more fuel so far and it probably needs another 1% which works out to around an 80 HP gain.
I'll try to get some pictures of my car this week so people can see it installed. Vids will happen when I can get a volunteer to ride shotgun... or just have my friend drive while I video.
At 16psi it looks like I have added about 5% more fuel so far and it probably needs another 1% which works out to around an 80 HP gain.
I'll try to get some pictures of my car this week so people can see it installed. Vids will happen when I can get a volunteer to ride shotgun... or just have my friend drive while I video.
02-16-2009, 03:48 PM
#13
Launching!
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Dam dude if I was still living in LV I'd help ya log just for the experience of a 10 sec fbody (should be dangerously close to 9's now...). Are you still on stock manifolds, btw?
02-16-2009, 06:46 PM
#16
Great job Zombie, should finally be able to run 9's at YOUR elevation when you get all the bugs worked out. Be sure to post up a vid at some point of this new turbo, I'm curious to see if it sounds any different over your Trans-brake spool up vid with the st-80/1.00 A/R.
