Redspencer's Track-Tuned IS350 w/ OS Giken LSD Build Thread
#556
I found some throttle body stuff on the tundras forums. They take out the TB gasket, and replaced it with a non grilled version. Months back I got an extra gasket, and cut out the metal grill out.
Now I've searched for days and couldn't get a definite answer to the purpose of it.
The Tundra guys remove it, because when they get intakes they getting a whistle noise.
What I found out it makes the throttle induction more noisy. So I don't know if it's letting more in or what. I could hear the noise inside the cabin. So I took it off again, and put a replacement back in. I would wonder if you would see any maf g/s increase with out it.
Now I've searched for days and couldn't get a definite answer to the purpose of it.
The Tundra guys remove it, because when they get intakes they getting a whistle noise.
What I found out it makes the throttle induction more noisy. So I don't know if it's letting more in or what. I could hear the noise inside the cabin. So I took it off again, and put a replacement back in. I would wonder if you would see any maf g/s increase with out it.
Good luck on the dyno, you have to clear 300hp this time. I went back and looked at your posted maf numbers and it looks like you picked up ~6% more airflow. That alone should put you on the 300hp line, with the timing adjustment putting you over.
Which intake are you going to run on the Dyno? You should try a run where you flip the lid to the air box to reduce that restriction.
Which intake are you going to run on the Dyno? You should try a run where you flip the lid to the air box to reduce that restriction.
I went back on the same dynojet from last year (April 2018); This time, the IS350 came equipped with the Megan Racing Midpipes which removed the previous exhaust flow bottleneck from using the OEM midpipes w/ cats. Now the engine can fully take advantage of the headers!
This dyno pull gained +11 RWHP and +20 ft/lbs torque over the previous dyno. IS350 made a consistent 293 RWHP and 286 ft/lbs on multiple pulls. It will likely crack 300rwhp on a more generous dynojet as the shop owner mentioned that this dynojet tends to read slightly lower than others.
I'm currently waiting for the shop to email me the dyno graph of today's pulls but in the meantime, enjoy this video (and turn up the volume).
Last edited by redspencer; 03-06-19 at 03:20 PM.
#557
So close to the 300hp mark, you can call it 300hp within a margin of error. Your torque is pretty decent, that's probably the highest be torque number I've seen. It will be interesting to compare the dyno graphs.
#558
Lexus Test Driver
iTrader: (2)
Good job! That is sweet music there!
Any chance you can get the AFR, ignition, and cam shaft advance data?
And do you know, does there flash even touch the cam positions?
FWIW I have the flash hardware, mygenius and all that but they can't touch it until I send them my ECM. No love for the 2013 gang.....
Any chance you can get the AFR, ignition, and cam shaft advance data?
And do you know, does there flash even touch the cam positions?
FWIW I have the flash hardware, mygenius and all that but they can't touch it until I send them my ECM. No love for the 2013 gang.....
#559
Good job! That is sweet music there!
Any chance you can get the AFR, ignition, and cam shaft advance data?
And do you know, does there flash even touch the cam positions?
FWIW I have the flash hardware, mygenius and all that but they can't touch it until I send them my ECM. No love for the 2013 gang.....
Any chance you can get the AFR, ignition, and cam shaft advance data?
And do you know, does there flash even touch the cam positions?
FWIW I have the flash hardware, mygenius and all that but they can't touch it until I send them my ECM. No love for the 2013 gang.....
Well, sorry for the delay but I have finally received the new dyno graph for all to review and provide input. Oddly, the dyno wasn't capturing the data from the peak RPM range of 6900-7200. The operator assured me that the transmission was in S-mode with 4th gear selected as the gear limiter.
If we go by what the previous dyno results were, the torque would continue to drop though the horsepower rating should still be within the same slope/peak hp range.
#560
Glad this thread is still of value to multiple CL members. though new upgrades to my IS350 have slowed down, I'll still be experimenting with modifying certain aspects of the vehicle for further refinement and improvements and taking the Lexus to the track for some fun while observing what else can be improved to the IS350 and myself as the driver
Seriously awesome thread!
#561
IS(350) owners are not the only ones enjoying the thread... I don't think I've seen a bigger/better write-up on 2IS/3GS chassis upgrades yet. Only problem is sometimes (well, a bit more often than that ) I wish I'd gotten an IS350 instead... *promptly hides and proceeds to continue looking at nb miatas*
Seriously awesome thread!
Seriously awesome thread!
#564
As for suspension/chassis - from what I've read bushings are shared, shocks are interchangeable, general suspension design is the same... etc.
I'm wondering if the 450h's hybrid system can handle more power from the engine like the highlander hybrid (look up the turbo on that one ^_^), but IMO the main thing that it needs is a "keep the engine at high revs at all times ready to go tesla style" mode. Possible with "manual gears" and mashing it into the lowest possible all the time, somewhat convenient with modded steering wheel with shifters
#566
I am looking at your graph compared to last years and noticed that it looks like your power was increased and brought back ~300rpm. It really looks like your HP should continue to climb when it just goes flat. Larger exhaust should have moved your powerband up in the RPMs a little so I am wondering if the oem airbox is now your next restriction. We should work something out next time you get on a dyno and ill send you my 3.5" intake and machined throttle body to try out.
#567
I am looking at your graph compared to last years and noticed that it looks like your power was increased and brought back ~300rpm. It really looks like your HP should continue to climb when it just goes flat. Larger exhaust should have moved your powerband up in the RPMs a little so I am wondering if the oem airbox is now your next restriction. We should work something out next time you get on a dyno and ill send you my 3.5" intake and machined throttle body to try out.
* One item to note between these two graphs:
- Old graph- ECT PWR was used which made recording TQ and HP at WOT under 4.5k-5.0k RPMs near impossible.
- New graph- I later learned that ECT Snow mode was the way to go and was used to properly record the lower/mid RPM range at WOT on this new graph.
As you noticed, the HP and Torque curves appear to intersect at 5252 RPMs on the old dyno graph vice ~5400 RPMs on the new dyno graph which is odd.
Regarding the 7200 RPM not fully showing on the dyno graph, the dyno operator assured me that the transmission was in S-Mode with the gear limiter set to 4th (which is the only way to go beyond the stock rev limit and to the 7k+ range in 4th gear). The more I think about it, the more I believe this is true as all five pulls resulted in the car bouncing off the rev limiter (which wouldn't happen if the transmission was left on auto/D mode as it would simply upshift to 5th gear). It still doesn't explain why the dyno graph cuts off around 6.8k-6.9k RPMs... Perhaps the Engine RPM reading on the graph is not fully accurate (maybe it has to do with my 275/35/18 rear tires not being the exact same size as the OEM diameter)?
Last edited by redspencer; 03-08-19 at 07:04 AM.
#568
The torque and horsepower aren't scaled the same. Look at the numbers on the side of the graph. That the reason the intersection is different. If they were scaled the same it would show the crossover at 5252.
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redspencer (03-08-19)
#569
If you look closely at the graph that crosses over at 5400rpm you will see that the HP and TQ are not quite scaled the same. How did they measure your RPM? It is possible that their math was wrong if your tire diameter differs from what they go off of and might account for some of the 20tq gain.
#570
If you look closely at the graph that crosses over at 5400rpm you will see that the HP and TQ are not quite scaled the same. How did they measure your RPM? It is possible that their math was wrong if your tire diameter differs from what they go off of and might account for some of the 20tq gain.
Last edited by redspencer; 03-08-19 at 10:03 AM.