First ever Rear Mounted Turbo maxima
02-10-2007, 08:25 PM
#281
you could unplug the VAFC and see if that resolves the problem, or just reset the VAFC and keep it configured for the car but no fuel corrections.
Test the injectors.
I dont think you upgraded your fuel setup for the rear mount did you?
Test the injectors.
I dont think you upgraded your fuel setup for the rear mount did you?
02-10-2007, 08:29 PM
#282
Originally Posted by MDeezy
you could unplug the VAFC and see if that resolves the problem, or just reset the VAFC and keep it configured for the car but no fuel corrections.
Test the injectors.
I dont think you upgraded your fuel setup for the rear mount did you?
Test the injectors.
I dont think you upgraded your fuel setup for the rear mount did you?
yes i was having a similar problem before and i thought it was because i screwed up the stock injectors (the car would actually turn off when this happend) because of my timing advanced and extremely high fuel pressure that i was running. So i put in z32 injectors. and car ran fine, till now. Im going to try everything tomorrow.
02-11-2007, 07:56 AM
#285
Originally Posted by Tatanko
Ugh, not another pioneering project gone wrong.
Craig Mack, anyone?
Craig Mack, anyone?
). And also, what nismology was reffering to was that when this wacked out ubber lean a/f occurs, vaccum drops to about ~15in Hg. Idle also drops some. AS IF there was a vaccum leak. But Nismology, s0ber and streetz looked around for one with a bottle of starter fluid and nothing they sprayed caused a change. So we're down to electrical.
02-11-2007, 08:55 AM
#286
Originally Posted by choray911
If the AFR is in the 10s or 11s, and the EGTs are high, then you might be able to retard timing a bit to get the temps down. If the AFRs are right, timing has been retarded, and the EGTs are still up, an intercooler or aftercooler might help.
If you live in a place that has a hot summer, the EGT readings will let you know if it is a bad idea to get into boost for the day.
I also use mine as a way to tell if it is safe to turn off the car with out baking the bearings inside the turbo.
Almost any car can be tuned with a EGT and a WB02.
Choray
If you live in a place that has a hot summer, the EGT readings will let you know if it is a bad idea to get into boost for the day.
I also use mine as a way to tell if it is safe to turn off the car with out baking the bearings inside the turbo.
Almost any car can be tuned with a EGT and a WB02.
Choray
02-11-2007, 11:00 PM
#287
How's your EGR valve? I happened to have egr issues with a Maxima I used to own and it would go lean every time the thing would try to open. It always seemed random so I never figured it out till way later. For some reason it always seemed to be worse in the winter than the summer too.
02-11-2007, 11:07 PM
#288
Junior Member
Join Date: Dec 2004
Posts: 26
There are a lot of things in your setup that differ from successful rear mounted turbos. First of all, the turbo supply line and drain should NOT be at an angle...ever, on any turbo setup. Oil needs to be able to freely, and quickly drain from the turbo; turbos do not want oil pressure, just a steady stream to lubricate otherwise oil will bypass the seals, smoke, and or fill the intake with oil. Also, do you have any kind of restrictor on the supply line? I don't doubt that you are supplying wayyyy to much oil if there is no restrictor. You were right to think about a turbo timer for the pump; most kits use one to run the pump for 1 minute after shutdown. An intercooler would most likely be worthless at your boost level, especially since the long charge pipe will lower the charge air temp sufficiently. Hopefully when you get the fuel sorted out the turbo will also spool quicker otherwise you may want to look into a smaller turbo/ turbine housing. Good luck with the project
02-12-2007, 06:05 AM
#289
My problem was the front o2 sensor!!! I unpluged them both and car idled perfect obviously rich since it has not o2's at 11.7 a/f. I connected one of the sensors and a/f went crazy again to really lean. So im installing new o2's in couple days. I am back in business 
Also I removed my VAFC2 because i cleaned up the wiring mess i had on my ECU and might install my emanage blue soon. so right now i dont have a working 00VI, low end is extremly slow and car does not even provide any power till about 4,000 RPM. Also being very rich below 3k does not help turbo spool up since EGT's are low at that richness. once i put the plugs in and im at near 14.7 that will really help turbo spool up sooner. I might be removing the power rod from the 00vi as well.
I dont think there is anything wrong with my oil setup. The feed line has a check valve that does not allow oil to flow into the turbo while the car is off, also I do have a restrictor on the turbos oil inlet, its a 1/16 size restrictor. My oil problem was not when the car was running but when the car was off. I have solved this problem by running the pump 2 minutes after engine is off. ever since iv been doing that, i have not had any oil on the charge pipe at all. I have a thick oil drain line coming out the turbo and into the pump so i seriously doubt there is any oil pressure on the return side of the turbo. There for I consider this project a success.
That is one of the things I wanted to check yesterday. But when I saw that the o2 sensor was causing the problem I didnt check the egr.
Also I removed my VAFC2 because i cleaned up the wiring mess i had on my ECU and might install my emanage blue soon. so right now i dont have a working 00VI, low end is extremly slow and car does not even provide any power till about 4,000 RPM. Also being very rich below 3k does not help turbo spool up since EGT's are low at that richness. once i put the plugs in and im at near 14.7 that will really help turbo spool up sooner. I might be removing the power rod from the 00vi as well.
Originally Posted by Geoff
There are a lot of things in your setup that differ from successful rear mounted turbos. First of all, the turbo supply line and drain should NOT be at an angle...ever, on any turbo setup. Oil needs to be able to freely, and quickly drain from the turbo; turbos do not want oil pressure, just a steady stream to lubricate otherwise oil will bypass the seals, smoke, and or fill the intake with oil. Also, do you have any kind of restrictor on the supply line? I don't doubt that you are supplying wayyyy to much oil if there is no restrictor. You were right to think about a turbo timer for the pump; most kits use one to run the pump for 1 minute after shutdown. An intercooler would most likely be worthless at your boost level, especially since the long charge pipe will lower the charge air temp sufficiently. Hopefully when you get the fuel sorted out the turbo will also spool quicker otherwise you may want to look into a smaller turbo/ turbine housing. Good luck with the project
Originally Posted by mtcookson
How's your EGR valve? I happened to have egr issues with a Maxima I used to own and it would go lean every time the thing would try to open. It always seemed random so I never figured it out till way later. For some reason it always seemed to be worse in the winter than the summer too.
02-19-2007, 06:14 PM
#293
Originally Posted by streetzlegend
Thanx all for the input. I30mike, I am planning on very very soon doing water injection with a similar scavenge pump, since i rather not do FMIC because it will add even more distance to the charge pipe. Water injection should hopefully help keep detonation down if theres any at all. I might need some advice from you guys with this whole turbo project once a while since im new to it. I just put in mobil 1 synthetic (usually use castrol gtx, when i drained it it looked like water lol, maybe the turbos heat caused it to brake down too much or something).
OR
use two 300zx intercoolers, theyre small and you can mount them to the rear of the car and run custom piping.
http://cgi.ebay.com/ebaymotors/300ZX...spagenameZWDVW
02-19-2007, 09:49 PM
#296
Originally Posted by streetzlegend
hmmm, i like the rear intercooler mounting idea. But will it work if its not getting direct air flow like in the front?
its getting its air flow from under the car, the toyota Mr2 uses a similar design setup on an aftermarket turbo kit.
With the 300zx intercoolers, they become hidden and they serve their purpose. One recommendation I would make here is, use the ducts the intercoolers come with. and when mounting them, angle the intercoolers down about 15 degrees from a 90 degree set up and you will get more efficient airflow ( since the rear suspension will diffuse the airflow, the angling of the intercoolers will pick that flow back up).
it might actually be more efficient,.. here's why, since these intercoolers are not mounted in front of the radiator, so then air flow is reduced simply put, they may get better flow rear mounted since there will be nothing hindering them. the ducts added will direct the laminar flow into the intercoolers as designed front or rear mounted. STillen might have the HDPE ducts to fit these intercoolers, also there is always ebay. Happy hunting.
02-19-2007, 10:22 PM
#297
Worse comes to worse, cut two holes in your rear bumper, ( doesnt have to be as big as the intercoolers, just enough to create some flow through) put some painted chicken wire behind the holes. and then you have proper flow through.
02-20-2007, 05:44 AM
#299
Originally Posted by doc2278
Worse comes to worse, cut two holes in your rear bumper, ( doesnt have to be as big as the intercoolers, just enough to create some flow through) put some painted chicken wire behind the holes. and then you have proper flow through.
02-20-2007, 11:17 AM
#302
Originally Posted by accordingtou
Sound Clips?
http://vids.myspace.com/index.cfm?fu...oid=1751144300
02-20-2007, 03:37 PM
#303
Originally Posted by streetzlegend
see if u can see this clip
http://vids.myspace.com/index.cfm?fu...oid=1751144300
http://vids.myspace.com/index.cfm?fu...oid=1751144300
02-22-2007, 08:11 AM
#306
02-22-2007, 08:13 AM
#307
Turbo
Originally Posted by streetzlegend
see if u can see this clip
http://vids.myspace.com/index.cfm?fu...oid=1751144300
http://vids.myspace.com/index.cfm?fu...oid=1751144300
02-22-2007, 08:45 AM
#309
QUESTION FOR ALL:
Do you guys think if I put a muffler with 3" inlet and outlet after the turbo. Will this cause too much restriction? I am thinking of doing dynomax muffler.
The muffler fits fine at the location where I have the turbo exhaust outlet pipe right now. We can just route that same pipe into the muffler and then out. The exhaust is starting to bother me a little bit. Maybe because my trunk is completly gutted. But still from outside is pretty loud. I just wanna make sure if i put a muffler its not going to rob some air flow.
Do you guys think if I put a muffler with 3" inlet and outlet after the turbo. Will this cause too much restriction? I am thinking of doing dynomax muffler.
The muffler fits fine at the location where I have the turbo exhaust outlet pipe right now. We can just route that same pipe into the muffler and then out. The exhaust is starting to bother me a little bit. Maybe because my trunk is completly gutted. But still from outside is pretty loud. I just wanna make sure if i put a muffler its not going to rob some air flow.
02-22-2007, 09:33 AM
#311
Originally Posted by Alex_V
I hate them but what about a cannister muffler, a little inset? it might act like a resonator.
~Alex
~Alex
02-22-2007, 01:28 PM
#313
Originally Posted by streetzlegend
QUESTION FOR ALL:
Do you guys think if I put a muffler with 3" inlet and outlet after the turbo. Will this cause too much restriction? I am thinking of doing dynomax muffler.
The muffler fits fine at the location where I have the turbo exhaust outlet pipe right now. We can just route that same pipe into the muffler and then out. The exhaust is starting to bother me a little bit. Maybe because my trunk is completly gutted. But still from outside is pretty loud. I just wanna make sure if i put a muffler its not going to rob some air flow.
Do you guys think if I put a muffler with 3" inlet and outlet after the turbo. Will this cause too much restriction? I am thinking of doing dynomax muffler.
The muffler fits fine at the location where I have the turbo exhaust outlet pipe right now. We can just route that same pipe into the muffler and then out. The exhaust is starting to bother me a little bit. Maybe because my trunk is completly gutted. But still from outside is pretty loud. I just wanna make sure if i put a muffler its not going to rob some air flow.
02-23-2007, 10:28 PM
#316
Originally Posted by hacim105
Good job on your accomplishment!
My only question is what value is it to have a rear mounted turbo as opposed to a front mounted turbo?
My only question is what value is it to have a rear mounted turbo as opposed to a front mounted turbo?
02-23-2007, 10:29 PM
#317
02-25-2007, 07:02 PM
#319
Originally Posted by t6378tp
just wondering do you think a 2 or 2-1/4 inch exhaust would help the turbo spool faster than your 2-1/2 exhaust
The larger your exhaust the faster you will spool... (watch out for diminishing returns).
Streetz to answer your question about the muffler, it won't hamper your performance to any significant extent.
