Cobalt SS: Project 25G
Cobalt SS: Project 25G
Sup guys, as some of you may know my last big turbo blew. Here is my last build thread you can follow it here: https://www.cobaltss.net/forums/2-0l...ct-efr-282881/
This is my new setup I have ready for testing by my tuner. This is a custom turbo, I might get some things wrong but here it goes. It is a td06 compressor housing with a 3" inlet and a 2" outlet. The compressor wheel size is Inducer 60.5mm exducer 78mm. It is pretty much comparable to a Gt35r. The compressor wheel size of my EFR is 53.9mm inducer and 67mm exducer. The new turbo is significantly bigger, and most likely will have much more noticeable lag as well.
Anyways, I think we can hit 500whp with this turbo on 100/e85 mix. The thing is I need fuel now to aid this larger turbo. I'm going to dyno on 91 octane at 20 psi, see if I can hit 400whp as a DD. Then tune/dyno for racegas etc when the weather cools down a bit.
The install will be this Saturday. Hopefully the install will be smooth and easy without any issues. Now it's time to show off some pictures




This is my new setup I have ready for testing by my tuner. This is a custom turbo, I might get some things wrong but here it goes. It is a td06 compressor housing with a 3" inlet and a 2" outlet. The compressor wheel size is Inducer 60.5mm exducer 78mm. It is pretty much comparable to a Gt35r. The compressor wheel size of my EFR is 53.9mm inducer and 67mm exducer. The new turbo is significantly bigger, and most likely will have much more noticeable lag as well.
Anyways, I think we can hit 500whp with this turbo on 100/e85 mix. The thing is I need fuel now to aid this larger turbo. I'm going to dyno on 91 octane at 20 psi, see if I can hit 400whp as a DD. Then tune/dyno for racegas etc when the weather cools down a bit.
The install will be this Saturday. Hopefully the install will be smooth and easy without any issues. Now it's time to show off some pictures
Next what the hell happened to your EFR?
Last edited by Terminator2; Apr 25, 2013 at 10:17 AM.
A S20G hits full spool at 4300-4400 or so. This one is larger and based on the same architecture so will lag more. 6500 Redline will mean a very short powerband on this setup (~1900 RPMs). You really need to get valvesprings so you can rev to 7500 or higher to take advantage of this turbos full potential.
Next what the hell happened to your EFR?
Next what the hell happened to your EFR?
Thanks bro
Yea, I'm not worried about the power as much as the drive-ability . I'm hoping it wont be that bad but we will see. This is not going to be my final set up. This is just for testing and tuning purposes. I'm a little behind on cash so James has offered to help me out for now by sending me this. When I have more money, I'll go back to another EFR most likely. I'm looking to go larger than a 6758.
Crap maybe I should add what I have on right now too LOL.
My current mod list is a (blown) 6758 EFR, TTR intake manifold, Badmab 3" catless downpipe stock resonator no muffler straight piped, KN Short ram intake, CX racing intercooler, Ky stage 3 clutch, ZZP front and rear transmission mounts, CM springs. Nitto Nt05 245/40/18 up front.
The parts I am adding/changing are the new custom 25g turbo, OTTP Cold and Hot charge pipes with HKS SSQV 3. ZZP Lower charge pipes and MAF relocate kit.
My current mod list is a (blown) 6758 EFR, TTR intake manifold, Badmab 3" catless downpipe stock resonator no muffler straight piped, KN Short ram intake, CX racing intercooler, Ky stage 3 clutch, ZZP front and rear transmission mounts, CM springs. Nitto Nt05 245/40/18 up front.
The parts I am adding/changing are the new custom 25g turbo, OTTP Cold and Hot charge pipes with HKS SSQV 3. ZZP Lower charge pipes and MAF relocate kit.
good luck man, glad to see some mitsubishi turbo love on the forum. I love my 20g and I believe my turbo is spooling much faster than the 4300 it did on the dyno. I did a rebuild and the car is just incredible. Cant wait for your results. 400whp daily driven is addicting, I try to stay civil on back roads because of cops but on the highway I cant keep my foot out of the pedal, its fast.
i am sorry but what you read on a dyno is nothing like what you feel in the car, its so easy to pass on a turbo based on numbers but the 20g is making 400 from 4500-7500 all day before a rebuild. Thats a lot of room under the curve and your still making over 300hp/300tq at 4100.
are you td06 on both sides?
are you td06 on both sides?
Last edited by c130aviator; Apr 26, 2013 at 07:15 PM. Reason: Automerged Doublepost
good luck man, glad to see some mitsubishi turbo love on the forum. I love my 20g and I believe my turbo is spooling much faster than the 4300 it did on the dyno. I did a rebuild and the car is just incredible. Cant wait for your results. 400whp daily driven is addicting, I try to stay civil on back roads because of cops but on the highway I cant keep my foot out of the pedal, its fast.
i am sorry but what you read on a dyno is nothing like what you feel in the car, its so easy to pass on a turbo based on numbers but the 20g is making 400 from 4500-7500 all day before a rebuild. Thats a lot of room under the curve and your still making over 300hp/300tq at 4100.
are you td06 on both sides?
are you td06 on both sides?
Me too brotha, I can't wait!
Thanks bro, I'm excited to see how it is for myself and this is even bigger than your 20g
. Your results make me happy, there aren't many ppl here running these so yea. It's a Hahn s20g kit with a td06 compressor housing and a CHRA swap. The compressor sizing is 60.5mm inducer and 78mm exducer. The exhaust turbine was machined and it is fitted with a 53mm/68mm exhaust turbine.
that smaller hot side should allow the spool to come on quicker. Very unique.
^^Hey c130aviator, I'm sure I just missed it somewhere, but what ever ended up being the issue you were having with the turbo not boosting?
sorry for the thread jack btw. I promise it will be a quick one Fastgti..
sorry for the thread jack btw. I promise it will be a quick one Fastgti..
No worries man, I want to know so I would know if that happens to me.



