Shmoo's GSR Engine Build: Operation 400whp not 56k friendly
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Thread Starter
On permanent hiatus
Joined: Jul 2004
Posts: 9,716
Likes: 0
From: A forum with actual tech
Thread Starter
On permanent hiatus
Joined: Jul 2004
Posts: 9,716
Likes: 0
From: A forum with actual tech
~~Update~~
I have made absolutely no progress on the engine build. I am still working out the kinks of the turbo stuff.
Here is some progress I have made since last update:
-I welded the dumptube to fit properly, so now it is connected and dumping under the car instead of right on the radiator.
-I purchased a new oil pan and tapped it differently to remove the nasty kink in the return line. I am still not satisfied with the way the return line sits because the turbo is so damn low but I have to work with what I've got.
-I'm about 75% done tuning it. The only stuff I have left to tune are the vtec maps and the boost portion of the maps above 5 psi. I wish PWM boost was available for Neptune already so I could hook up a boost solenoid and tune for boost by gear and maybe crank it up to 8-9 psi to see about 310-320 whp. It has an 8 psi spring but with the altitude, I am only seeing about 6 psi of absolute pressure.
I have decided that I am going to go ahead and have the block sleeved. I can't decide on a 83 or 84mm bore, though. Any input?
Here is an updated picture of the turbo setup w/ new dumptube:
I have made absolutely no progress on the engine build. I am still working out the kinks of the turbo stuff.
Here is some progress I have made since last update:
-I welded the dumptube to fit properly, so now it is connected and dumping under the car instead of right on the radiator.
-I purchased a new oil pan and tapped it differently to remove the nasty kink in the return line. I am still not satisfied with the way the return line sits because the turbo is so damn low but I have to work with what I've got.
-I'm about 75% done tuning it. The only stuff I have left to tune are the vtec maps and the boost portion of the maps above 5 psi. I wish PWM boost was available for Neptune already so I could hook up a boost solenoid and tune for boost by gear and maybe crank it up to 8-9 psi to see about 310-320 whp. It has an 8 psi spring but with the altitude, I am only seeing about 6 psi of absolute pressure.
I have decided that I am going to go ahead and have the block sleeved. I can't decide on a 83 or 84mm bore, though. Any input?
Here is an updated picture of the turbo setup w/ new dumptube:
wow that looks crazy.
glad to see there's some progress.
as for the block sleeving, keep the smaller bore. more torque at this point just means more wheelspin in my opinion.
but what do i know.
another random question, did you have a problem with melting the rubber on your dipsticks with the greddy manifold?
glad to see there's some progress.
as for the block sleeving, keep the smaller bore. more torque at this point just means more wheelspin in my opinion.
but what do i know.
another random question, did you have a problem with melting the rubber on your dipsticks with the greddy manifold?
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2016 BMW 340i M-Sport / 2013 Chevrolet Volt / 1999 Subaru Impreza RS EJ205
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Thanks for the input guys. I was leaning more toward 83mm as well just so there could be more meat on the sleeves in case something catastrophic happened and the block needed reboring. The torque issue is pretty much negligible between the two bore sizes since the difference in displacement is 1.88L vs 1.92L.
And yes, the Greddy manifold loved to melt the dipsticks since it was practically touching the dipstick tube. That manifold got so much hotter and stayed hotter much longer than the tubular piece. I don't think I have to worry about melting dipsticks any longer.
Oh and I tried rerouting the charge piping to have the compressor outlet to face down and run a 90 off it but the piping hangs lower than the oil pan, so I am stuck with the mess of bends I have now.
And yes, the Greddy manifold loved to melt the dipsticks since it was practically touching the dipstick tube. That manifold got so much hotter and stayed hotter much longer than the tubular piece. I don't think I have to worry about melting dipsticks any longer.

Oh and I tried rerouting the charge piping to have the compressor outlet to face down and run a 90 off it but the piping hangs lower than the oil pan, so I am stuck with the mess of bends I have now.
Last edited by Provocateur; Nov 13, 2007 at 07:02 AM.
Thread Starter
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