Rb25det Vacuum Lines correct?! Boost Solenoid

SON240sx Automotive
1

Hey all, I have been searching the net and can’t seem to find helpful information, I went by
the information of one site, and nearly toasted my turbo it spiked to like 15psi haha.
Nobodies fault but mine, I figure my piping is quite different from a stock gts-t and I missunderstood.

My car seems more sluggish then after the swap, I am only peaking 7pounds vs 10 so I must have
rearranged my lines properly to the boost solenoid or completely messed them up. Also clutch is
on its last legs, so maybe slipping often.

These pictures are how I have them hooked up (somewhat OK, right now) im not sure it is proper…
[ATTACH=CONFIG]18203[/ATTACH][ATTACH=CONFIG]18204[/ATTACH]
Line A : single line (no tee) from a connector on the recirc from BOV directly to bottom of Boost Sol

Line B : (B from wastegate actuator) In a tee with line C going to top of boost solenoid

Line C : goes to intake manifold (in tee with b)

PS: Vacuum at idle is about 20

How I tried to hook them up…
Line B: From actuator (single line) to Top of boost solenoid

Line A+C: in Tee to bottom of boost solenoid

Thanks- Jacob

2

I can’t see the pcitures from work but the RB25det solenoid runs 2 stages of boost. It’s 5psi to 4500rpm then aprroximately 7-8psi after that. You can do two things if you want more boost. Ground the solenoid so you are always running 8psi, or put in a wastegate actuator from an RB20det turbo. I’ve done both and the power difference is noticable, but so are the dollars at the pump lol. before the mod I averaged 450km per tank, now I get 300km lol.

3

^ That’s only because you probably had a bit of a heavier foot after you did the mod, lol. If you’re not in boost that much, the mileage should be around the same. That’s the beauty of boosted cars. My fully built SR with 850cc injectors running on 18 PSI still gets the same gas mileage as my old stock SR with bolt ons @ 12 psi (Different engine, I know, but the principle is the same).