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Old 07-14-2012, 11:16 AM   #1
2000GAGT
Turbo 3.5L LX9
 
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3.5L LX9 rear mount turbo

Hello all,

This past month I have been working on a rear mount turbo for the car. Over the years I have been putting too much effort into this car, but what the hell, why not

I swapped in the 3.5L LX9 3 years ago and have put about 40k miles on it.
Replaced the transmission 6 years ago and put about 130k miles on.
Also ran the Vortech supercharger for about two years.
Now added a rear mount turbo.
Odometer just broke 238k yesterday

I have owned this car for 10 years and did all the work by myself in my garage.















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Old 07-14-2012, 01:23 PM   #2
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Someone want to explain to me the point of a rear mounted turbo?
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Old 07-14-2012, 01:36 PM   #3
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Lots of power for less? Idk I didn't spend much money on this and it's lots of fun
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Old 07-14-2012, 01:55 PM   #4
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Any dyno sheets?
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Old 07-14-2012, 02:05 PM   #5
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Someone want to explain to me the point of a rear mounted turbo?
Some cars it is cheaper and easier to put the turbo in back where the muffler is, than up in the engine bay. Advantages are it can keep too much heat out of the engine bay, and can be better packaging and use of space. Especially if you have a tight engine bay where a turbo is hard to fit. Disadvantages are slower spool time, and the need to run much longer charge pipes, as well as long oil lines and an oil pump to lubricate the turbo and then send the oil back to the engine. You have to be careful how you install it and how much ground clearance you have, because you have to protect the piping and oil lines and the turbo itself, as well the the intake filter.

My personal opinion is these work better on V8 cars with more displacement and torque. They aren't affected by the turbo lag as much and have more exhaust flow to spool them up faster. I haven't seen anyone do a really "good" install and design on a rear mount turbo on one of these cars yet though, so it would be interesting to see the results from one.
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Old 07-14-2012, 02:34 PM   #6
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1) Someone with these type of modification needs to be around here more often.

2) Have any pictures of the full car? I see some crap front bumper on your car and kind of scared to see what else is on the exterior.

3) What are specs on the turbo?

4) I can always appreciate a turbo build, not sure if I've actually seen another rear mounted kit on these cars completed before. So props to you.

As someone who has put a lot of effort into their car, hope to see you around here more often.
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Old 07-14-2012, 03:27 PM   #7
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Wow that looks really awesome... I'm really impressed! As mentioned above, you should post more often .

1.) How much boost are you gonna running in this mofo?
2.) Also what internal engine mods have you done to accomodate the turbo?
3.) What are your goals for hp and quarter mile times?
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Old 07-14-2012, 05:51 PM   #8
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Props to you sir. I appreciate someone who finds new ways to upgrade their GA. Please post all problems dealing with tuning and with this install. And any probs you are currently having
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Old 07-15-2012, 07:05 PM   #9
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Sorry don't have any dyno numbers, just finished this a week ago and never did get number with the supercharger when it was in.

I do have more pictures, I'll try to get them on later tonight if I have time. Yes the bodykit was a waste of time and money, I've had it on since summer of 2003 when I was young and dumb.

The turbo itself is small and underpowered, bought a cheap new one just in case this all failed and I didn't waste extra money. There is lots of turbo lag on this, I haven't tuned anything yet and getting 4 psi at full throttle but 7 psi at half throttle. So far the most impressive thing is getting on the freeway at half throttle definitely moves faster then stock with full throttle.

Engine is still stock. Very unfortunate but long story sort I already had the new engine in the garage and the old one was falling about so it was a quick fix before I had time to upgrade.
Only upgrades are 28lb injectors, LX5 throttle and an old PCM tune.

As for as goals...to slowly keep it alive and more powerful? Since its been charging I get lots of thumbs up and people impressed how fast it pulls down the freeway. I guess that really was my goal, to do the unknown. The kind of upgrades people won't do because of time and difficulty. I've always loved a challenge and thinking the impossible.

Also a good note is this was my only car and daily driver from 2002-2011. I live in MN so it has been through every snow storm and survived.
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Old 07-15-2012, 07:27 PM   #10
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Quote:
Originally Posted by 2000GAGT View Post
Sorry don't have any dyno numbers, just finished this a week ago and never did get number with the supercharger when it was in.

I do have more pictures, I'll try to get them on later tonight if I have time. Yes the bodykit was a waste of time and money, I've had it on since summer of 2003 when I was young and dumb.

The turbo itself is small and underpowered, bought a cheap new one just in case this all failed and I didn't waste extra money. There is lots of turbo lag on this, I haven't tuned anything yet and getting 4 psi at full throttle but 7 psi at half throttle. So far the most impressive thing is getting on the freeway at half throttle definitely moves faster then stock with full throttle.

Engine is still stock. Very unfortunate but long story sort I already had the new engine in the garage and the old one was falling about so it was a quick fix before I had time to upgrade.
Only upgrades are 28lb injectors, LX5 throttle and an old PCM tune.

As for as goals...to slowly keep it alive and more powerful? Since its been charging I get lots of thumbs up and people impressed how fast it pulls down the freeway. I guess that really was my goal, to do the unknown. The kind of upgrades people won't do because of time and difficulty. I've always loved a challenge and thinking the impossible.

Also a good note is this was my only car and daily driver from 2002-2011. I live in MN so it has been through every snow storm and survived.
Now that's my kind of car!
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Old 07-15-2012, 07:31 PM   #11
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I'd back off driving the car at all until you get a proper tune and figure out the boost issues.
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Old 07-15-2012, 08:13 PM   #12
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Well the PCM was tuned when i had the supercharger running and I have data logging software to help monitor A/F and timing. Everything has been pretty much the same but you're right, it needs to be tuned and setup up 100%.

Helps that this car is old and survived everything so I'm not afraid to test its limits. I'm not lazy so when something breaks, I fix it and make it better.
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Old 07-15-2012, 08:40 PM   #13
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Old 07-15-2012, 09:17 PM   #14
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Meh, replace the bumpers and tails.
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Old 07-15-2012, 09:29 PM   #15
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Find some black GAGT bumpers and some new tailights and you will have a very nice GA! Im impressed with your work! Now onto the appearence!
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Old 07-15-2012, 10:40 PM   #16
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Lol thanks guys for the appearance comments, honestly appreciate it. One of my roommates says the same thing about the bumpers. The only reason for the aftermarket tail / headlights is because after the years the factory ones started letting too much water in and I wanted to change it up. The bodykit was a waste and I got rid of the factory bumpers in 2004 so only reason still on.

Gotta give me credit for how descent the body looks considering the roads are salted in winter. I see grand ams around here with way more rust and half the miles.

The best part about the rear mount turbo is how well you can hear the turbo wind up. Even from a stop light it turns heads and gets thumbs up
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Old 07-16-2012, 05:45 AM   #17
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Didn't I buy your front bumper back in 2004?


Good to see its still running.
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Old 07-16-2012, 07:23 AM   #18
2000GAGT
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Haha BINGO! So everyone can blame Dr. Fab for my current situation
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Old 07-16-2012, 07:30 AM   #19
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Thanks Matt, funny thing is I don't think anyone knew I know Dr Fab. We used to work together way back when he had his 2.4l

That's how he got a hold of my bumper.
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Old 07-16-2012, 10:30 AM   #20
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Looks like your PCV system is setup wrong.
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