GT2871 Highway pull and dyno graph.
#25
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I recommend you pull 3* or so from 128kpa+ if you ever plan to put the car on the track. That spark table can work on the street, but considering time where I'm running the car from 100-158mph every lap, pulling some spark angle makes sense for reliability. I keep telling myself to install the EGT gauge and get better data, but that requires drilling into the AF manifold and I don't have the heart to do that.
I'll post my spark table later, but this dyno sheet shows the progression to MBT while tuning at low boost for NASATT classing. I added 2* on each pull and you can clearly see that red is the greatest output, green is advanced beyond MBT, and blue is where I started and where I left it. I'm not sure how much extra heat that 3* retard from MBT puts in the exhaust, but I still see <190*f radiator inlet temps.
It's even lower if he's on an early 1.8 bottom end and a 99 head.
Last edited by hustler; 02-25-2011 at 12:50 PM.
#29
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Indeed it does. Your spark map was the inspiration for mine.
56
My early spark tables are very similar, but I can't find it on the forum and I'm at work so you get no pics. However, I run my spark angle a bit lower today after I started letting the dyno pull-down the motor to get a good, realistic track-like duty cycle going, while using Jeff C's det cans. I wouldn't say I heard detonation, but there is a change in the combustion sound, slightly off-rhythm when doing this procedure. That sound made me yank a couple degrees and the syncopation-rhythm went away.
I recommend you pull 3* or so from 128kpa+ if you ever plan to put the car on the track. That spark table can work on the street, but considering time where I'm running the car from 100-158mph every lap, pulling some spark angle makes sense for reliability. I keep telling myself to install the EGT gauge and get better data, but that requires drilling into the AF manifold and I don't have the heart to do that.
I'll post my spark table later, but this dyno sheet shows the progression to MBT while tuning at low boost for NASATT classing. I added 2* on each pull and you can clearly see that red is the greatest output, green is advanced beyond MBT, and blue is where I started and where I left it. I'm not sure how much extra heat that 3* retard from MBT puts in the exhaust, but I still see <190*f radiator inlet temps.
Ah ****, disregard everything I just posted...maybe I'll leave it for the good of the people.
It's even lower if he's on an early 1.8 bottom end and a 99 head.
I recommend you pull 3* or so from 128kpa+ if you ever plan to put the car on the track. That spark table can work on the street, but considering time where I'm running the car from 100-158mph every lap, pulling some spark angle makes sense for reliability. I keep telling myself to install the EGT gauge and get better data, but that requires drilling into the AF manifold and I don't have the heart to do that.
I'll post my spark table later, but this dyno sheet shows the progression to MBT while tuning at low boost for NASATT classing. I added 2* on each pull and you can clearly see that red is the greatest output, green is advanced beyond MBT, and blue is where I started and where I left it. I'm not sure how much extra heat that 3* retard from MBT puts in the exhaust, but I still see <190*f radiator inlet temps.
Ah ****, disregard everything I just posted...maybe I'll leave it for the good of the people.
It's even lower if he's on an early 1.8 bottom end and a 99 head.
#36
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.86 I love this turbo. It is amazing. I replaced my disco potato with this and the difference is immense.
http://www.atpturbo.com/mm5/merchant...egory_Code=GRT
Thats the one i bought.
And for some reason, i cant help myself but to post a picture of this baby. This is my favorite part of the car.
You never answered our question about this statement.
http://www.atpturbo.com/mm5/merchant...egory_Code=GRT
Thats the one i bought.
And for some reason, i cant help myself but to post a picture of this baby. This is my favorite part of the car.
#37
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John and I put a few 99-heads on early 1.8 bottom ends and they never seem to make more power aside form a slight increase in mid-range. I'm not sure if the cams mount higher, altering the cam timing (VW issue) or if the deck is higher but something strange is going on. The next time we have the two lying around maybe he and I can measure.
There's a rumor in town that the 949 clutch overheats on long drives for some reason, can you attest to this? I hope this is the case, it will save me some money.
I guess you also agree that this clutch changes the game and makes you smile every time you drive it? I'm always giddy when I hop in John's car and I'd really like to get one in my car. I have a standard weight clutch assembly right now and I'd really like to downshift faster, especially with the tight ratios; I've been skipping gears on every downshift.
There's a rumor in town that the 949 clutch overheats on long drives for some reason, can you attest to this? I hope this is the case, it will save me some money.
I guess you also agree that this clutch changes the game and makes you smile every time you drive it? I'm always giddy when I hop in John's car and I'd really like to get one in my car. I have a standard weight clutch assembly right now and I'd really like to downshift faster, especially with the tight ratios; I've been skipping gears on every downshift.
#38
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There's a rumor in town that the 949 clutch overheats on long drives for some reason, can you attest to this? I hope this is the case, it will save me some money.
I guess you also agree that this clutch changes the game and makes you smile every time you drive it? I'm always giddy when I hop in John's car and I'd really like to get one in my car. I have a standard weight clutch assembly right now and I'd really like to downshift faster, especially with the tight ratios; I've been skipping gears on every downshift.
I guess you also agree that this clutch changes the game and makes you smile every time you drive it? I'm always giddy when I hop in John's car and I'd really like to get one in my car. I have a standard weight clutch assembly right now and I'd really like to downshift faster, especially with the tight ratios; I've been skipping gears on every downshift.