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  #231  
Old 01-13-2008, 09:03 PM
kc95sc400 kc95sc400 is offline
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...continued from above post, hit submit instead of preview.

If I continue to have idle issues with my current setup, it may be safe to assume that my car doen't like the 2.5 inch piping for some reason. Maybe there is too much turbulence where it's stepped up to 3 inch. I don't know.

Either way, I have reset my ECU and will be driving the car to work in the morning so I should know.

I have been considering a colder thermostat. Probably won't affect my IAT reading at all but would keep overall temps down.

Interesting note. I was working on an 2000 Avalon the other day. I had it running about 20 minutes with the hood open. The ambient temp was 70 degrees and the Avalon's IAT reading was 120 degrees. Interesting. Avalons have the MAF/IAT sensor right after the airbox and the airbox has a snorkel that goes to the driver side fender well area.

KC
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  #232  
Old 01-13-2008, 09:15 PM
kc95sc400 kc95sc400 is offline
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Quote:
Originally Posted by RedPhoenix View Post
Fair enough Im assuming the bracket hits the body. happy hammer time
Once you get the LS400 bracket on the motor and you hold the fish bracket up to the motor, you'll have no doubt on what needs to be done.

I cut a good chunk of my fish bracket off, it fit without cutting, but I couldn't put my finger inbetween the fish and the frame of the car.

Are you installing soon?

A couple of tips for anyone installing the fish. At very least, change your T-belt, to remove the hydro pump, you're half way there. And, T-belt changes will be harder after the SC is installed. Invest in a set of snap ring pliers to remove the AC pulley and clutch, makes installation of the fish so much easier. Consider a idler setup like the one I have, I'm using a 2.4 inch pulley (about 12psi with our crank size) and I have had no slipping issues. I had some belt wear due to pulley misalignment, but I fixed that and haven't had any problems with the belt since. I even did see 12psi once on accident.

KC
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  #233  
Old 01-14-2008, 06:25 AM
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RedPhoenix RedPhoenix is offline
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Thanks for the tips
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  #234  
Old 01-14-2008, 11:20 AM
kc95sc400 kc95sc400 is offline
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Default WTF!

So with the new non IC setup, I have 2.5 pipe going to 3 inch before the MAF and then 3 inch to the throttle body.

The car misses at idle and has even stalled on me a couple of times. Assuming nothing else has changed, as far as engine condition, the only thing I can think of is that too much turbulence is being created between the 2.5 inch and 3 inch pipes. And, the turbulence is screwing with the MAF signal.

It's only a problem with warmed up idle, in gear. If I put it in park or neutral it idles fine. I suppose it could be the idle control valve.

Before I jump to any conculsions, I am going to go back to the first non IC setup, which used all 3 inch pipe, and see if anything changes. If it does, great, if not, I guess I have another problem. It did idle fine with all three inch with the first setup.

KC
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  #235  
Old 01-14-2008, 11:22 AM
kc95sc400 kc95sc400 is offline
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Do you have an aftermarket IAC? If so, where is it installed?

Mine is about 6inches before the throttle body.

KC

Quote:
Originally Posted by stevechumo View Post
Well, if you run more than 9 psi, in theory and my experience is you must have the IC to be safe. Compressed air creates heat. The higher temp will more likely preignite and cause trouble, also with less oxygen and less power. However, since you run the SC set up, it's a lot less heat than the turbo like my set up. Even with the intercooler, a turbo can still cause the heat up to 200 degree like you mentioned. I've seen 250 degree with a turbo system. I'd say 150 degree is still good.

In the past, I experimented the rubber heat hoses at Home Depot and installed them half way in the intake after the IC and guess what, they're almost melted and got so soft. In your set up, 50-60 degree is really good. Keep in mind the heat is also caused by the engine. If you can prevent the engine heat, then you might not need the IC at all.

The reason you see slow boost is due to the piping route. You can actually increase the boost response by using smaller pipes before the IC.
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  #236  
Old 01-15-2008, 12:47 AM
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stevechumo stevechumo is offline
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Quote:
Originally Posted by kc95sc400 View Post
Do you have an aftermarket IAC? If so, where is it installed?

Mine is about 6inches before the throttle body.

KC
KC,
Sorry to hear your car misfires. It shouldn't do that. I'm using the stock IAC with the MAF located behind the BOV. The IAC is in its original place. I used to have the engine stalled when I released the gas due to the BOV located behind the MAF. Putting the BOV behind makes my car run normal. I only boosted my car a little and there's no problem whatsoever. I connected the IAC to the plug right & under before the TB, as you can see the highlighted red line. This plug is used to provide the air source for the stock intake pipe. I used the barb adapter from 3/4" to 5/8" for this connection.
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  #237  
Old 01-28-2008, 12:36 AM
kc95sc400 kc95sc400 is offline
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Guys, long time no post.

So I have probably tried more IC and non IC supercharged setups on the Lexus SC400 than anybody on the planet.

1. There's my original IC setup.
2. My original IC setup with a 2.5 inch straight pipe in place of the IC.
3. Non intercooled setup with 2.5 inch all the way to the MAF.
4. Non intercooled setup with 3.0 inch all the way to the MAF.
5. Various non intercooled setups with the 2.5 to 3.0 inch transition being in different places.
6. Probably a few others that are now a blur.

Anyway, I think I've finally settled on a setup! Right now I am running with the IC but, a bit differently than I was originally.

My current setup is like this (sorry, no pics yet) - the supercharger outlet is pointed towards the driver's side. From the outlet, 2.5 inch pipe turns towards the front of the car, runs under the headlight and then turns towards the passenger side of the car. The pipe continues through the AC lines for the reciever / drier, over the frame rail, into the IC. The IC is turned upside down from my original setup, the inlet and outlets are on the top. From the IC outlet, 2.5 inch pipe runs under the passenger side headlight and makes a turn towards the rear of the car. Directly after the headlight, the piping changes to 3.0 inch and goes to the MAF. I have the factory plastic intake (modded, the air chamber is removed) from the MAF to the throttle body.

Don't know if that makes any sense, but I like the setup.

I still have a few improvements to make to it. All my piping has been hacked from all the different setups I've tried, so this current setup is kind of thrown together. I am planning on ordering some more pipes and a few other bits that will improve it. I am confident that the changes I plan on making will make it even more awesome.

There is a significant reduction in piping with this setup compared to my original IC setup. I tightened my throttle cable a bit and throttle response is not an issue in the slightest. I am seeing on average, without boost, 20 degrees over ambient. Compared to 15 degrees with my original IC setup and 60-70 degrees with the non IC setups. I also still have the cold air K@N setup. I am also currently seeing 9 or so psi fairly easily without any signs of running out of fuel, using the MAFTPro to ensure my AFR stays where I want it with boost.

I will take some pics once I get my new piping and clean it all up a bit.

I've been driving the car about a week or so with this IC setup, and I think that overall, this is the best one I've tried. There are some drawbacks with the IC and all the piping, the non IC setups were a little more fun to drive, but I was constantly worried about my intake temps, which took away that little extra fun.

KC
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  #238  
Old 01-28-2008, 12:38 AM
kc95sc400 kc95sc400 is offline
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Mark (Blizzy) and I have been supporting each other with our projects for a while now. Now that I am finally confident in my cars capabilities, I decided to make some vids to clock my 0-60 and 45-65 times in the way that he has.

In case you've missed Blizzy's thread.. http://clublexus.com/forums/showthre...hlight=madness

I am very happy with the results so far. I am consistenly seeing 5's for 0-60. I did have 2 runs were I was in the 4.8 second range. I think with some more practice launching , I could get down a bit lower even. I also think that there is some time to shed with a proper bov / bypass setup and with the improvements I plan to make to my current IC setup.

On to the vids.

This is a 5.07 second run..
http://youtube.com/watch?v=nC7a-TpcSXc

A 5.13 second run..
http://youtube.com/watch?v=aZ4hhUrUET0

And just for fun, a 6.47 second run with the tires spinning all the way up to the 1-2 shift. When it shifted to second, the car was at about a 30 degree angle to the driver's side of my intended straight line.
http://youtube.com/watch?v=QdsU3Nvs3ZY

I am super excited to be in the 5 second bracket. Let me know what you guys think.

Also, I did one vid doing a 45-65 run and the time was about 2.5 seconds! The quality of the vid is poor, so I'll try and make another later to post.

KC
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  #239  
Old 01-28-2008, 06:48 AM
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RedPhoenix RedPhoenix is offline
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Wow... that is awesome! I cant wait to see more pics/vids!

Good job, you have come a long way!
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  #240  
Old 01-28-2008, 10:53 AM
kc95sc400 kc95sc400 is offline
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Quote:
Originally Posted by RedPhoenix View Post
Wow... that is awesome! I cant wait to see more pics/vids!

Good job, you have come a long way!
Thanks. I am honestly suprised to be in the 5 second range. I really think that with practice, I can get even lower times.

I also think the tweaking I plan to do with my current intake / IC setup will make a significant difference.

I hope to make a few more vids later today, I'll post them for sure.

KC
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