Just Picked Up My Cobalt SS/TC!
NY only scans OBDII for emissions so as long as your CEL light isnt on technically you should be fine.
VA uses a sniffer...
2)Tune and DP. $400. Best bang for the buck as far as performance....an additional 40 HP for tune and another 10-15HP for DP. You can add all the other mods and as far as HP goes, you won't get more than another 15 HP TOTAL. Do NOT tune for boost over 21/ 22 lbs...other's will chime in and say more (up to 24 lbs) is "OK"...DON'T DO IT!
Nice clean car there! You'll love it.
Like D-mac said..... keep your stock stuff just incase you have to throw it on for inspection ....especially the downpipe . I would go with a downpipe and tune first .... then grab an intake and charge pipes when you can . You don't need to tune for charge pipes but a retune should be done with an intake .
Senior Member
Joined: 09-05-10
Posts: 1,668
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From: St. Louis, MO
1) Pedder springs and rear Powell Sway bar...$500. Lowers a bit and improves handling.
2)Tune and DP. $400. Best bang for the buck as far as performance....an additional 40 HP for tune and another 10-15HP for DP. You can add all the other mods and as far as HP goes, you won't get more than another 15 HP TOTAL. Do NOT tune for boost over 21/ 22 lbs...other's will chime in and say more (up to 24 lbs) is "OK"...DON'T DO IT!
Nice clean car there! You'll love it.
2)Tune and DP. $400. Best bang for the buck as far as performance....an additional 40 HP for tune and another 10-15HP for DP. You can add all the other mods and as far as HP goes, you won't get more than another 15 HP TOTAL. Do NOT tune for boost over 21/ 22 lbs...other's will chime in and say more (up to 24 lbs) is "OK"...DON'T DO IT!
Nice clean car there! You'll love it.
Senior Member
Joined: 09-05-10
Posts: 1,668
Likes: 0
From: St. Louis, MO
I get that I'm at 21psi and that puts it at 33lbs/Min. Doesn't the KO4 max at 36lbs/min? I know of cars that have been running 24psi+ for 30,000 plus miles and have had zero issues.
Using assumed variables, and assuming that this chart is the correct one (lots of assumption there), that would seem to indicate that at the very outside edge of the efficiency island is around 22 psig before the compressor will surge - this lines up with both the overboost protection in the computer and what some tuners have run into already. 21 is about the max safe boost level on the stock K04 (which is what Hahn's tuner sets the boost to, so this lines up as well).
Intake without a tune is just a bad idea.
To the OP downpipe is the most beneficial mod you can do on these cars. Intake is worth while as well if you're sure to tune for it. Intercooler, Charge Piing, and Cat-Back are more of an option then anything.
If you want the BOV sound go with the Forge BPV modern performance sells it. It's a much cheaper solution opposed to paying for a BOV, Charge Piping with the MAF relocation to mount the BOV, and relocate the MAF, and a tune to be able to relocated the MAF.
Suspension wise Pedders, and SSC aka CM seem to be the popular choices concerning springs.
To the OP downpipe is the most beneficial mod you can do on these cars. Intake is worth while as well if you're sure to tune for it. Intercooler, Charge Piing, and Cat-Back are more of an option then anything.
If you want the BOV sound go with the Forge BPV modern performance sells it. It's a much cheaper solution opposed to paying for a BOV, Charge Piping with the MAF relocation to mount the BOV, and relocate the MAF, and a tune to be able to relocated the MAF.
Suspension wise Pedders, and SSC aka CM seem to be the popular choices concerning springs.
https://www.cobaltss.net/forums/2893164-post8.html
Using assumed variables, and assuming that this chart is the correct one (lots of assumption there), that would seem to indicate that at the very outside edge of the efficiency island is around 22 psig before the compressor will surge - this lines up with both the overboost protection in the computer and what some tuners have run into already. 21 is about the max safe boost level on the stock K04 (which is what Hahn's tuner sets the boost to, so this lines up as well).
Using assumed variables, and assuming that this chart is the correct one (lots of assumption there), that would seem to indicate that at the very outside edge of the efficiency island is around 22 psig before the compressor will surge - this lines up with both the overboost protection in the computer and what some tuners have run into already. 21 is about the max safe boost level on the stock K04 (which is what Hahn's tuner sets the boost to, so this lines up as well).
Thats a VERY outdated article, and many advances have been made since then.
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