Should stock valve springs (on a 2.0 turbo engine), be used when uping the boost, or upgrading to a slighter bigger turbo?
Basically im probably going to use a stock turbo, then upgrade to a garrett t-3 (from a turbocoupe)
I didn't know if i should change the valve springs ,or not.
Thanks in advance
Gary me the big g express
As long as the springs are in good shape it'd be OK to use them. If you have them out check the pressure at the stock installed height. I ran 17 lbs of boost on my old engine and it had 108,000 on it. When I built my new engine I had an old set of springs around so I checked the installed pressure for the hell of it and they were slightly stronger then the recommended pressure so they would have been OK.
I'm running 26 lbs of boost now with new stock springs and they work fine. The installed pressure is a little higher than stock but that's just the way they ended up.
Tony
Tony
1987 Sunbird GT turbo convert
Ported intake, Fiero 53 MM TB, 52 lb inj, ported and flowed head, tube header, Mitsu TD06, ARP rod
bolts/head studs, adj cam sprocket, 4" x 12" x 31" FMIC, Paxton AFPR, modified 125 trans/LSD
unit/3.42's, custom chip tuning, Alky Control Methanol injection
13.61 ET at 101.44 mph, 262 WHP/350WTQ
2009 Pontiac Solstice GXP roadster, 2.0 turbo w/GMPP exh, CAI and turbo upgrade, 290 hp/325 ft lbs
1969 Olds 442 convert
400 Eng, 200-4R trans, 3.73 posi, power everything, OAI
Damn, 26 lbs of boost.
So what does your car run now in the quarter mile?
Thanks for the info on the springs , not bad for a $7.00 set of springs.
Unfortunately, the one weekend I had it ready to race my wife decided to have our second child. Of course that was about 2 weeks before the local track closed for the winter. But as us Red Sox fans usually say "wait till next year".
We'll see in the spring unless I blow it pieces between now and then. The way my luck's been lately that's very possible.
Tony
Tony
1987 Sunbird GT turbo convert
Ported intake, Fiero 53 MM TB, 52 lb inj, ported and flowed head, tube header, Mitsu TD06, ARP rod
bolts/head studs, adj cam sprocket, 4" x 12" x 31" FMIC, Paxton AFPR, modified 125 trans/LSD
unit/3.42's, custom chip tuning, Alky Control Methanol injection
13.61 ET at 101.44 mph, 262 WHP/350WTQ
2009 Pontiac Solstice GXP roadster, 2.0 turbo w/GMPP exh, CAI and turbo upgrade, 290 hp/325 ft lbs
1969 Olds 442 convert
400 Eng, 200-4R trans, 3.73 posi, power everything, OAI
