red1993gsallmt
20+ Year Contributor
- 420
- 3
- Dec 30, 2002
-
long branch,
New_Jersey
I recently installed a holset hx40 on my car despite the problems people have had with them. I am very happy with this turbo so far and i drive my car everyday with no problems so far. The main reason i think people are blowing them is high oil pressure with to small of a drain. When i first put a oil pressure gauge on my car i was seeing upwards of 140psi at redline which i bet would kill any turbo. So i ported my housing and got the pressure down to 105ish, then cut two loops off the spring and that took it down to 75psi at redline and 18-20psi at idle. I also made my own drain using 3/4 copper with two 45* bends instead of one 90* bend. For oil feed i use a 4an line off a 1990 air cooled oil filter housing and instead of welding the feed fitting shut to drill it out to a restricted size of.078 or .082 i simply tapped the whole to fit a set screw in it and drilled the set screw out to .082. That way if i ever wanted to go smaller i could simply spin the set screw out of the fitting and drill a new one. I chose .082 because i was able to get my oil pressure down, lots of other guys are using .078 with good results. the turbo has 1800mi on it with no shaft play or smoke, and boost is at 25psi. I really want to thank jusmx for all the help and info, very smart guy and quick to help people out. I will keep everyone posted as the miles rack up, hope to get to the track next saturday, cant go this weekend with all the rain. Oh and if your thinking of lowering oil pressure because its to high, do it. I always noticed my car reved a little slow but i thought it was because of the stroker set up, as soon as i got the oil pressure down it revs WAY faster, well worth the effort. Sorry about the pics, not the greatist with a camera