samson

I'm just curious of when I should be able to hit full boost out of my SOHC. I expect around 3K, but I'm not completely positive, just my guess. It's a Volvo T3 .42/.48 turbo soon to be on my 98 Civic so a SOHC Vtec d16y8. I plan to run 8psi. Any ideas? Thanks!


JP

Netrisk032

depending on your exhaust set up maybe before or around 3300 rpms. i have seen people with stock exhaust get spool times at around 3600 rpms so maybe 3000 rpms is achievable

Threads

I have the setup you want. I have a 2.5" downpipe and a restrictive 2.25" mandrel-bent exhaust system. I get full boost at 3500rpm in 4th gear. In 1-3 gear it starts to spool around 3-3500rpm and gets full boost a tad bit after that. I am running 7 psi spiking to 9 psi. I love it, but my 3" exhaust should be coming in and will be installed next week. I am hoping I get full boost at 3500rpm in 1-3 gears. If you want, i could let you know how it goes.........

Fulcrum

Depends on what kind of manifold you're using. Pressure drop across the turbine is what determines spool time.

samson

I think it's an even flow mani from HKS. Cast iron. It's not peakboost/ramhorn style, but not log. An in-betweener.


JP

Fulcrum

I would guess around 3k. If you're running an electronic boost controller maybe a little earlier. Thats prolly about as good as it's gonna get. Any turbo that would spool earlier prolly wont be able to support enough airflow to maintain 8 psi til redline.

samson

I got a deal on the T3 so I went with it and I was worried since it was bigger on a sohc that it'd lag and be kinda slower than hoped. However, alot of people support the bigger later spooling T3 to the T25 and T28. Anyone else have an opinion?


JP