Hey guys,
Been browsing the boards now for a couple weeks reading everything I can on volvo's, since I'm a complete nooby to them.. I just picked one up which happens to be Nemesis' old car. I really love the design of the car and everything feels great, but I'm having some performance issues that are completely stumping me.
First of all... the mods from what I was told:
91 740 Turbo
Bigger injectors
IPD turbo cam with adjustable gear set to 5degrees advanced
3" exhaust with high flow cat
Greddy bov
What I believe is a larger stock turbo
After buying the car I brought it home and started doing the normal maintenance. First things was replacing like 20' of vacuum lines to be sure I wouldn't have any vacuum leaks. After that I replaced all the older, work/rusty clamps with new ones. There was low compression in the first cylinder and we thought it might be a head gasket, although there was no smoke. A freshly rebuilt head came with the car when I had bought it so I went ahead and bought the head-up gasket kit and replaced the head with the new fresh one (8v head). Made sure my timing was set right with the crank case mark and having the cam at TDC, put it all back together, put in fresh coolant and did an oil change. At this point I thought the car would be running great, but it still feels like it's realllly lacking power I did notice a small crack on the exhaust manifold, but other than that everything looks fine.
Got it all back together and did some good ol' driveway test launching For some reason it doesn't seem to build boost until extremely late in the power band (4k'ish rpm) and even then it's only about 1/4 of the way into the boost range on the gauge. I can put the pedal all the way to the floor and it doesn't seem to help at all, just feels really sluggish. After I let off the throttle, the car drops REALLY low in rpm's and after it's run for a little and warms up or driven for a longer distance it stalls and I have trouble getting it started again. I have checked the MAF and cleaned it, along with cleaning the throttle body. I believe maybe the O2 sensor is gas soaked or something since it threw the check engine light....
How should the bov line be hooked up? I keep looking at pictures and diagrams and I can't make sense of what should go where since they're all slightly different. The car has a line coming off the turbos wastegate going into a "Y" adapter with the bov going into the other side of the "Y" and then both of those go into the single line that feeds into the intake manifold behind the throttle body, which I'm assuming in manifold vacuum. Could this be causing the issue of the car not building boost and stalling after throttle? I'm new to the whole turbo thing....
I did the whole starting fluid trick to check for any vacuum leaks and I can't find any at all, and I double checked all of my intake/exhaust nuts to be sure they were tight. At this point I'm stumped
Thanks guys for all of the knowledge I've gotten so far from reading. Sorry if some of this has been covered before, but I haven't read it =/ I've been doing nothing but research on this thing for weeks now and I feel lost.
Thanks for all the help in advance!
Been browsing the boards now for a couple weeks reading everything I can on volvo's, since I'm a complete nooby to them.. I just picked one up which happens to be Nemesis' old car. I really love the design of the car and everything feels great, but I'm having some performance issues that are completely stumping me.
First of all... the mods from what I was told:
91 740 Turbo
Bigger injectors
IPD turbo cam with adjustable gear set to 5degrees advanced
3" exhaust with high flow cat
Greddy bov
What I believe is a larger stock turbo
After buying the car I brought it home and started doing the normal maintenance. First things was replacing like 20' of vacuum lines to be sure I wouldn't have any vacuum leaks. After that I replaced all the older, work/rusty clamps with new ones. There was low compression in the first cylinder and we thought it might be a head gasket, although there was no smoke. A freshly rebuilt head came with the car when I had bought it so I went ahead and bought the head-up gasket kit and replaced the head with the new fresh one (8v head). Made sure my timing was set right with the crank case mark and having the cam at TDC, put it all back together, put in fresh coolant and did an oil change. At this point I thought the car would be running great, but it still feels like it's realllly lacking power I did notice a small crack on the exhaust manifold, but other than that everything looks fine.
Got it all back together and did some good ol' driveway test launching For some reason it doesn't seem to build boost until extremely late in the power band (4k'ish rpm) and even then it's only about 1/4 of the way into the boost range on the gauge. I can put the pedal all the way to the floor and it doesn't seem to help at all, just feels really sluggish. After I let off the throttle, the car drops REALLY low in rpm's and after it's run for a little and warms up or driven for a longer distance it stalls and I have trouble getting it started again. I have checked the MAF and cleaned it, along with cleaning the throttle body. I believe maybe the O2 sensor is gas soaked or something since it threw the check engine light....
How should the bov line be hooked up? I keep looking at pictures and diagrams and I can't make sense of what should go where since they're all slightly different. The car has a line coming off the turbos wastegate going into a "Y" adapter with the bov going into the other side of the "Y" and then both of those go into the single line that feeds into the intake manifold behind the throttle body, which I'm assuming in manifold vacuum. Could this be causing the issue of the car not building boost and stalling after throttle? I'm new to the whole turbo thing....
I did the whole starting fluid trick to check for any vacuum leaks and I can't find any at all, and I double checked all of my intake/exhaust nuts to be sure they were tight. At this point I'm stumped
Thanks guys for all of the knowledge I've gotten so far from reading. Sorry if some of this has been covered before, but I haven't read it =/ I've been doing nothing but research on this thing for weeks now and I feel lost.
Thanks for all the help in advance!