No problem, glad I could help. BTW, both TM and NGK are nice plugs...however, it is PROVEN that TM plugs can yield a gain of as much as 5whp but the NGK's last longer. So, it's up to you. FYI I am on my second set of TM plugs in the last 7 years...I can still probably get another 2 years out of these plugs no problem. They are probably good for 4 years or so...

 

Isn't the stock matched profile 275/30/19? Your tires are also higher than normal profiled..
How clean's the MAF sensor?

 

3rd...........

 

The circumfrerence of the tire is probably the same but the rims are probably heavier. Im sure Im giving up some ponies but I gotta rock the 19's lol

Im going to clean the maf, t/b, new plugs, oil change and run some basic injector cleaner this weekend; I was gonna do this anyway since I dont know the history of the car.

 

on a side note,since you dont know the history, change your fluids also

 

supposed to be in 3rd huh? if so this will also increase my numbers not to mention the run I posted was actually the lowest one of the 3 because we lost the other runs due to a freezing computer so I just took what I could. One of the other runs was like 213 hp 217tq. Maybe the combination of the rims and being in 4th gear are what is missing here. Im starting to think that maybe there is nothing wrong with my car and a few variables are throwing me off.

I talked with my friend last night who dyno'd my car and told him what kind of numbers the car should be making and he immediately reminded me of my 19" heavier wheels and the differences in different dyno machines and several customer stories he has witnessed....essentially telling me that my car is probably fine and that my numbers are real.

It was ran on a DynoJet and with SAE corrections; he's had countless customers come in to dyno who already had numbers from different dyno's and they are always shocked to see the numbers lower on the dynojet. He told me he can make my car read more power on the graph if thats what you want but that he ran it the way you are supposed to.

What I'm getting out of this is that you cannot compare different dyno numbers against each other. The real purpose is to tune cars and test modifications.

 

yea I'm gonna get to those too, I saw the power steering change on here, actually I think you just posted the old thread for someone recently, super easy!
What about fuel filter or any other parts? and recommendation on injector cleaner or will any of them do the job?

 

yeah i posted vince's old power steering post for someone lately.... it really was super easy.

check the sticky's for 99% of all things your needing but since im leaving in 9 mins and im in a super great mood today i will hook you up


https://www.clublexus.com/forums/gs-...el-filter.html

IF u do this, post your cut up filter in there afterwards and make sure you pay attention to the reassembly a few members have had issues


have a good weekend guys, im out.....

 

Today I changed spark plugs, cleaned the T/B, MAF air meter and ran a little seafoam in my gas and oil to lightly clean up the engine and I plan to change the oil sometime this week. I didn't run the seafoam like Ive seen people do it on youtube where the car smokes for 10 minutes, I just ran a little in the oil and gas for a light cleaning....no smoke or issues at all.

There were two things I noticed when changing the spark plugs. 2 of the 8 plugs were only hand tight and the rest were snug but not tight enough like they should be......so I had a couple lose plugs and the rubber ends of the coil were all gummy with brown oily stuff.
The other thing is that the recommended gap for a gs430 is at .44 and all my old plugs were around .38 - that's a marginal difference in gap to me but I don't know much about plug gap to know what that would do?

I also made sure to reset the ECU by unplugging the battery and after everything was done I cruised it around for a little while for the ECU to adjust. One thing for sure is my car NOW peels out by punching it from a dead stop so there is a little increase in performance. I think I might be ready to dyno my car again and see what my mods and tune up has done to increase the overall power....

 

Yup...good job! BTW, I thought 4th gear in our car is 1:1? I never asked my tuner what gear he was tuning it in but I do know he was saying that he had to make sure it was at a 1:1 ratio.

Get it re-dyno'd...I am telling you, you will probably dyno higher now. FYI...my dyno sessions were all on a dyno dynamics AWD dyno.

 

In fact the real motivator for me was to test the exhaust set up I chose to go with; there seems to be a lot of people that think going 2.5 will make me lose performance which I completely disagree with, but maybe Im wrong. I just dont see how any engine that produces 300hp and all that cfm to go with cant utilize 2.5" tubing especially once I get my hands on PPE and A/F.


All I have to say is back pressure...a larger exhaust isn't always better. Putting a 3" exhaust on a Honda(hey, we've seen it right?) doesn't help. Of all the Hondas I have owned(never again) the largest i went was 2.5" with a big turbo and it was golden. There's really a balance I guess. I feel that the dual exhaust on the GS works good....supposing the engineers spent some time figuring it out as they usually do. No, this doesn't mean I agree with all they do, I at one point removed my rear mufflers in favor os straight pipes back there, didn;t see any performance gains but man did it sound gnarly! But it droned a lot on the highway so with my 2 hour commute everyday it's back to aftermarket mufflers. But this is all just my 2 cents....we all have our own opinion on things. And if it matters I was a mechanic for 14 years. Built a lot of different cars, Toyota(my lex too), Chevy, Dodge, Classics, N/A and turbo....and so on.
Good to get a baseline on your car though....that 430 should be putting down 340 torque per Lexus....so that dyno sheet seems discouraging.

 

2.5" is practiclly a standard size for modded V8's......on all the v8's Ive ever worked on this size is an absolute must but on this forum the reason why people are telling me not to go that big is because the 3UZ is "different" and doesnt respond well to exhaust mods. I've probably been told by about 7 people on here not to go 2.5" BUT not ONE person has ran 2.5" true dual mandrel xpipe set up and tuned their car and dyno'd it. By the time I get the headers and A/F controller the exhaust gasses are gonna be doing the moonwalk as they exit lol

Between a pretty dirty MAF sensor and T/B, lose sparkplugs, 19" rims, being tested on a dynojet with SAE corrections and the fact that one of my runs was 213 & 217 I bet the car is right about where it should be. My friends dyno is known to be on the conservative side which is kinda good, I dyno'd my 67' Mustang on that machine and it put down 215hp 228tq which means it prob has more than I thought at the fly. I'll post my next run in the next few weeks.

the TQ is rated at 325 not 340

 

I need to determine the correct gear to test it in, I used 4th but another member told me to use 3rd.

 

Dynojets actually usually show higher #s...

I'm guessing the 2.5" is the culprit. Mustang dynos are going to be the most accurate.

 

FYI...4th gear is the true 1:1 and what your car should be dyno'd at.

http://www.supercarsite.net/lexus/gs-430/2001