Re: 1994 Infiniti Q45 rear mount turbo project
 

Damn that would be nice. Are the 370cc side fred? If not you could always put in 8 dsm 450 :D

Re: 1994 Infiniti Q45 rear mount turbo project
 

Yes, unfortunately they are side fed. I can get an adapter kit to convert but that along with a set of 8 injectors is $$$. Will have to wait. I'm going to play with my tune and try some tricks to get more from this setup first. I need to check my fuel pressure, I can probably bump it up some and get more from these injectors. I should be able to go a little leaner now that I'm getting the timing sorted out which should help as well. My AFR's are in the low 11's but I'm still running w/o an intercooler at the moment so it needs to be a little on the rich side especially going into summer here in Phoenix, it's 100*F+ all the time, sometimes even at night in the summer.

Here's one of my wideband graphs. Mostly mid-low 11's except where I hit the rev limiter (spike) :P

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Re: 1994 Infiniti Q45 rear mount turbo project
 

I'm pretty sure the 350z box = the rb25det box = the gtr box (minus transfer and forged shot peened stuff). IE, it should be good for the power/torque.

Re: 1994 Infiniti Q45 rear mount turbo project
 

good to see you tuning the stock ECU, your running 18dbtdc at WOT > 4500 and 15dbtdc at WOT and <4500 (with knock monitoring on)... i know with the KA's they pretty much dont use the knock monitoring for WOT stuff, im GUESSING the knock sensor is the same (or similar) with the Q45, but either way i'm REALLY glad to see this update, obviously alot of progress has been made, looks like it hauls some serious ass. :o

Re: 1994 Infiniti Q45 rear mount turbo project
 

I like the bumper cam :6

Re: 1994 Infiniti Q45 rear mount turbo project
 

I still have a lot to learn about tuning but I think I'm making good progress. Since the log above I've retarded timing quite a bit above ~4K. I've been fighting some detonation between 4-5K. I've just about gotten rid of it I believe. I made some more changes and have a new chip in the car now but still need to check it. I decided to experiment with the variable cam timing. The stock setting turns it off at 4600+ rpm. I've been wondering if that needed to be changed now that it's boosted but haven't been able to find any documentation on the subject yet. I found some dyno testing results that showed no noticeable gains in changing it but those tests were all done NA. I dropped the setting to 3900 so I'll see if it seems to make any difference.

I'd like to learn a bit more on what the numbers mean on the maps. I know the high numbers on the timing map mean it's monitoring knock and to subtract 128 from the number to get the actual timing. The low rpm and load areas of the fuel maps have a value of 5.88 in all of them. What does this number indicate? I can effectively eliminate knock detection from some other values I can modify as well. I can set the min TP and RPM for knock detection as well. I could just turn them up to where they would never be an issue. All I've done currently to eliminate the effects of knock detection is make the no knock and knock maps the same.

This weekend I also tossed the bleed style boost controller I have been using for a regulator feeding the WG top port. The other one was working ok but I like this method better and I will only have one knob to adjust. I haven't had a chance to try it and dial in my desired boost yet so hopefully it will work as planned. I also mounted a red LED next to the boost gauge that comes on when the methanol kicks in so I know when it's on. I wasn't sure if I had the pressure switch set where I wanted it so now I can see exactly when it comes on.

Re: 1994 Infiniti Q45 rear mount turbo project
 

having the high/low ign/fuel maps isnt for knock response is it? I personally go with the KISS method also and keep em the same O0 i THOUGHT the only means of turning off the knock responce and auto fuel trim on/off was to add 128 to it... obviously i need to get out and do a bit of tuning myself... didnt realize the VH45DE's had variable cam timing! wouldnt that make it a "VH45VE"? (i just wiki'd it, guess they dropped VTC in 96)... anywho not TOO many people have boosted VH's, but i guess the stock internals are pretty decent, so 400whp on pump gas is probably VERY doable (if not more)

Re: 1994 Infiniti Q45 rear mount turbo project
 

I got tired of guessing which map it was referencing. I've been fighting a little detonation and eventually (I'm a little slow I guess) realized I wasn't doing anything with the knock maps. At this point my primary maps were much richer and less timing than the knock maps so when it detected a little knock and switched to the knock maps it got worse. ::) Anyway, then I just made them all the same so it doesn't really matter which one it's on.

I have a list on my laptop at home of all the addresses I have details for on my ECU. You can check them out but there are several knock settings and the minimum TP and RPM for knock detection. I'll post it up tonight. Some of the values may be the same for other Nissan ECU's or at least they are available if you can locate the address.

Re: 1994 Infiniti Q45 rear mount turbo project
 

yeah, saw you going back and forth trying to figure out a TP tracing/logging solution for your ECU with DeviousKA... it would be cool if you posted up your .bin for reference, you still running stock 370's, if so time to upgrade to 550's :6

Re: 1994 Infiniti Q45 rear mount turbo project
 

explain to me how the oil return works. is there a pump to pump it all back? that oil return scares me.

Re: 1994 Infiniti Q45 rear mount turbo project
 

I was a little concerned about it myself but it's working pretty flawlessly and it's really pretty simple.

Oil feeds from a filter sandwich plate up front. I took that to a "T" and put a pressure sender for the dash gauge there. Then I have a needle valve for pressure regulation on the feed line to the turbo. 1/4" tranny cooler line feeds to the back where I take it through a check valve to keep oil from draining or siphoning to or from the motor when the engine's off. A short run using stainless braided line from the check valve into the turbo. The drain comes out and up about 12" into the trunk into an oil scavenge pump which runs all the time the ignition is on. I also have a 30 second timer on the pump to run it after I shut off the car to drain the turbo of oil. From there it leads to the front through 3/8" tranny cooler line into the engine bay through modified glass fuel filter which I use for a sight glass so I know when/if oil is flowing through the turbo system. From the sight glass it drains back into the pass. side valve cover. Initially it drained back into the filler cap that was modified but it was a pain to change/add oil because you have to pull the hose to do it. You can see above where I now have a fitting the valve cover for the return line.

Sounds like a lot but it wasn't all that difficult and it's been working great so far. If you look back through this thread there are photos of everything.

Re: 1994 Infiniti Q45 rear mount turbo project
 

Crap, had a rough drive home from work today. Been testing and setting my new MBC today and it was working pretty well, even ran at 9 psi for a bit :P and all was good. I had actually just turned down the MBC a bit trying to get back to 8 psi where I've been tuning to make sure everything was cool. Was at WOT/ full boost and got a strange pop noise, boost shot up to about 14-16 psi, the engine cut out, and obviously detonated, all very rapidly. Needless to say I was very bummed out. I pulled over and looked things over. While I was coming to a stop I could hear an odd clanking noise. Looking under the car I was thinking maybe I blew out my diff, driveshaft, or something like that because the engine was still running fine an smooth. Couldn't narrow it down. Looked at the turbo plumbing and I had blown off the BOV and wastegate hoses :X Looks like I need some better clamps if I'm going to run higher boost.

I limped home with my damaged pride and investigated my clank with the help of my son. Turns out I snapped a rear wheel stud and it was clanking around inside of the wheel lug cover. That same wheel already had one broken stud so I assume it couldn't handle the torque as well with only 4 lugs on it, now it's got three.

Re: 1994 Infiniti Q45 rear mount turbo project
 

Here's a copy of that ECU address list for my car. It ended up a little small so I'll upload it from my office tomorrow so you can download it full size from my web site. Not sure you can even read any of this but here it is. I'll change the post to reflect the link to the full size one later.

http://www.c4caraudio.com/tech/force..._addresses.JPG

EDIT.....Fixed image so you can read it, follow the link. the values are not all what I'm using any more...

Re: 1994 Infiniti Q45 rear mount turbo project
 

DE can be normal, or fixed vvt or maybe even variable vvt, VE is the honda licensed vtech clone stuff with two lobes.

Re: 1994 Infiniti Q45 rear mount turbo project
 

Arent you going to have a ton of turbo lag?

Re: 1994 Infiniti Q45 rear mount turbo project
 

What that question directed at me? "going to" This systems been installed for almost 10 months. I have less lag than most of the turbo vehicle's I've been in. As long as you size the turbine corrected you will have no more lag than any other turbo setup. The turbine a/r will be much smaller for a rear mount, mine is .68 and I could go a bit smaller and this thing would spool extremely fast. You do have to let the turbo warm up before it will make full boost but that doesn't take long. I suspect it's the same for all turbo installs but of course a front mount will heat up faster.

Re: 1994 Infiniti Q45 rear mount turbo project
 

Damn sucks about the wheel stud, I thought the trans had gone on you for a sec. BTW what size piping are you runing from turbo to tb, I know you put it up some where, but I didn't see it.

Re: 1994 Infiniti Q45 rear mount turbo project
 

2.5" until under the front fender, then to 3.5" into the MAF and 3.5" into the TB. Ya it does suck but I'm taking this opportunity to finish a bunch of other things I've been putting off. Since it will be up on the jacks again I'm going to put on my lowering springs and Tokico shocks, new wheel studs of course, 4.08 rear diff, steering boots, rear sway bar, adjustable front tension rods, trans cooler, and if I can sneak it past the wife an FMIC :-X I told her the other day that "my intercooler is broken, I need a new one, ROFL

Oh....and an overboost protection circuit ::)

Re: 1994 Infiniti Q45 rear mount turbo project
 

Just a idea, if you had less then 2.5 pipe going up front; say what ever the cold side exit on the turbo it self going all the way up front wouldn't it help with lag? Also if the piping is made out of aluminum wont it also act like a intercooler in a way?

Re: 1994 Infiniti Q45 rear mount turbo project
 

It's only 3.5" for about 20" or so. The MAF is that diameter so I wanted it to be that diameter for a bit before that to match the velocity and keep turbulence down. I'm sure my intake temps aren't really bad and most rear mounts don't use them at lower boost, <7-8 psi, but I'm running 8 and trying to get a little more. Plus ambient temps here are very high through the summer. I need all the help I can get, plus if it gives me another 20-30 hp or more then I'm all over that! I NEED MORE POWER!

Re: 1994 Infiniti Q45 rear mount turbo project
 

Made some more progress on the car recently. Had a few maintenance issues to deal with and finally got a bunch of parts installed that I've been sitting on. New Tokico shocks and some lowering springs, adjustable tension rods, new steering boots. Installed a rear sway bar from an active suspension model of my car. I also upgraded the rear diff to a 4.08 which should make for some excellent ripper vids :y The stock diff is a 3.538 ratio.

Started the intercooler install as well. Need to pick up a few tubing U bends and it should go in pretty easily.

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Re: 1994 Infiniti Q45 rear mount turbo project
 

That rear end is going to bring that car to life.

Love it.

Re: 1994 Infiniti Q45 rear mount turbo project
 

I agree, pretty excited to see what she'll do with this rear end. I was already breaking the rear end loose from a 20 mph rolling start, should get exciting now. :o

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Re: 1994 Infiniti Q45 rear mount turbo project
 

Got the intercooler installed. I think it turned out great. The size was perfect for the Q45. I made new plumbing under the motor and gained about 1.5" of clearance. With the old tube I couldn't even back straight out of my driveway without scraping. Now I can (slowly) without scraping.

As usual I took tons of photos. Shows all the intercooler plumbing and tubing under the motor. Also some pics showing the new stance with the lowering springs/Tokico shocks.

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Re: 1994 Infiniti Q45 rear mount turbo project
 

:y Looking good.

Re: 1994 Infiniti Q45 rear mount turbo project
 

Damn that looks really good. :y

Re: 1994 Infiniti Q45 rear mount turbo project
 

I just love that picture of the tailpipes - a WG and turbine for either side. That rearend alone will make a huge difference. The DX to Si difference between FD's is about half that, and ricers everywhere swear it drops their quarter mile in HALF. :y

BTW why do the IM runners drop down like its a traversely-mounted V8? (think FWD Cadillac) I've seen unusual intakes, but that's straight-up retarded.

Re: 1994 Infiniti Q45 rear mount turbo project
 

I don't know why they did the intake plenum like that. Looks decent in chrome I guess. It's a pain in the but to get off and there are many components under it. You can't even change all the fuel injectors without taking it off. Tons of hoses and the knock sensors are down there as well.

Re: 1994 Infiniti Q45 rear mount turbo project
 

WOW! i found this will i was looking for a turbo setup for my car a 1987 200sx. do you think that this i s a good setup for my car because i have a v6 and no room upfront.

Re: 1994 Infiniti Q45 rear mount turbo project
 

If you do your homework and you do the install right with the right components this can work for any vehicle. I'm a believer in rear mounts and love my setup. Still working great. Been driving it a lot lately. Putting about 80 miles per day on it and still going strong. Latest upgrade is a Moates Ostrich 2 EPROM emulator so I can do real time tuning on the fly. Beats the heck out of swapping EPROM chips. When the weather cools off again in a couple months I will get the dyno done and see what numbers this thing is making.

Re: 1994 Infiniti Q45 rear mount turbo project
 

You definitely did a great job on your turbo project. I've been following you when you first started and it has been entertaining. I'm work'n on my own Nissan project and one of the biggest obstacles I know I will have to deal with is the programming/tuning as it is a newer vehicle. I'm interested to see your power numbers as I think it should be similar to what my vk56 will but out once it is all said and done.

Again good job!

Re: 1994 Infiniti Q45 rear mount turbo project
 

One of the cleanest and most original builds ever.
Waiting to see some videos of you raping evo's off the line and roll. That would be some sick ---- man.

Re: 1994 Infiniti Q45 rear mount turbo project
 

You are going to like the Moates gear. It's super robust and reliable, and lasts a lifetime.

Re: 1994 Infiniti Q45 rear mount turbo project
 

I've been fighting my Ostrich since I got it in April. First it came vendor-locked, which took forever to figure out wtf was up with it. Luckly I found some obscure post about TunerPro being able to reinitialize it. Then I finally get my backup license for Crome Pro (the Ostrich was the reason I lost my original reg key, as I thought it was my WinXP install locking it) and I find out the ------- thing is sending ZERO signals through the cable. Long story short, I'm taking full advantage of their 30day return policy - I bought another, and I'm returning this in its place. That, or I'm issuing a chargeback.

Never, ever, ever, have I had such a rough time with hardware. I seriously thought about stealing a CC to pay for this to rip them off, I was so ------- pissed. Cocksucker needs to test his stuff before it ships, period. :7

Re: 1994 Infiniti Q45 rear mount turbo project
 

I had some trouble getting the Ostrich to communicate as well at first. It turns out I needed their socket booster. As soon as I plugged that in the thing fired right up and has worked flawlessly ever since. You might want to consider checking into that option.

Re: 1994 Infiniti Q45 rear mount turbo project
 

HiProfile has limited experience or understanding, $5 says he had port settings all wrong. Choosing too high or too low a baud rate will cause the problem he describes.

Also, don't confuse what eCtune does with what the Moates gear does. Install S or K Manager on some computers and it takes an act of god to get Moates gear to work again without a reformat - $10 says Doug made their FTDI drivers do that on purpose.

Re: 1994 Infiniti Q45 rear mount turbo project
 

I thought the fucker was front wheel drive this whole time, never even noticed the pumpkin and half shafts in any of the pictures. Once I seen the intake I guess my brain just ignored the rearend.

Rocks even more now that I know it's right wheel drive :y

Re: 1994 Infiniti Q45 rear mount turbo project
 

what can I say that is a one of a kind I have never before you seen a boosted q45 and from what i have seen it freakin moves. keep up the work and updates

Re: 1994 Infiniti Q45 rear mount turbo project
 

this ---- is ------- sickkkkkk, Total sleeper ( even lookes like a stock exhaust).

i flipped through but i'll come back to read..

good stuff..

Re: 1994 Infiniti Q45 rear mount turbo project
 

Haha... BYU Creamery bucket?

Nice build! I have a special place in my heart for rear mounted setups.