Race Tracking Your Supra - Information exchange

[kaj]

Well, weight out is weight out, counteract with aero balance and suspension tuning? Exhaust + battery + seat + wheels + suspension is around -65kg to take off, making it sub 1500kg car with full tank.
no?

He was just saying *just* the exhaust isn't going to help much. If it's part of a larger plan, than obviously it's going to help.

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[razorlab]

EGT logging is inferred unfortunately and I doubt anyone has run actual EGT probes and logged.

Just don’t run a ton of boost through the oem style turbine housing and you should be okay.

@Islindur

Here is a snippet from the end of the straight in my Supra. This is in cool ambient temp but inferred EGT is about the same even in 80F+ ambient. Pure 700 turbo, GESI catted downpipe, oem catback.

 

[kyle9]

Well, weight out is weight out, counteract with aero balance and suspension tuning? Exhaust + battery + seat + wheels + suspension is around -65kg to take off, making it sub 1500kg car with full tank.
no?

You can take 100lb off the rear axle and you might drop a tiny bit of lap time.

You take 100lb off the front axle you drop a ton of lap time, comparatively speaking.

compared to tire compound, aero, or horsepower, taking weight off the rear is nothing.

if you don’t need more flow I’d just chop off the resonators and muffler instead of paying for a full to exhaust… and mostly just to be able to hear the car better. Or do the exhaust because you like it, but it’s a poor $/performance mod.

 

[razorlab]

Well, weight out is weight out, counteract with aero balance and suspension tuning? Exhaust + battery + seat + wheels + suspension is around -65kg to take off, making it sub 1500kg car with full tank.
no?

With lightweight battery, drivers side seat and rear diff weight out, I saved 80lbs. Where are you taking out an additional 60lbs?

 

[Islindur]

You can take 100lb off the rear axle and you might drop a tiny bit of lap time.

You take 100lb off the front axle you drop a ton of lap time, comparatively speaking.

compared to tire compound, aero, or horsepower, taking weight off the rear is nothing.

if you don’t need more flow I’d just chop off the resonators and muffler instead of paying for a full to exhaust… and mostly just to be able to hear the car better. Or do the exhaust because you like it, but it’s a poor $/performance mod.

Well, if temps are ok I think stock one is good enough for 440whp reliably?
I'd feel good mentaly being sub 1500kg full tank with aero but dunno if it matters time wise in the end

 

[Islindur]

With lightweight battery, drivers side seat and rear diff weight out, I saved 80lbs. Where are you taking out an additional 60lbs?

-Ohlins R&T is supposed to be around 10kg lighter vs stock susp.
-Whifbitz titanium exhaust supposed to save ~18kg.
-Brake upgrade I'm gonna do uses lightway caliper design, overall ~5kg less.

 

[razorlab]

-Ohlins R&T is supposed to be around 10kg lighter vs stock susp.

20lbs lighter? Hmmm. I have my OEM suspension, I can weigh it when I find some time.

-Whifbitz titanium exhaust supposed to save ~18kg

-Brake upgrade I'm gonna do uses lightway caliper design, overall ~5kg less.

I guess it adds up. Some expensive weight loss though. $6k or so to lose 40lbs?

 

[Islindur]

20lbs lighter? Hmmm. I have my OEM suspension, I can weigh it when I find some time.



I guess it adds up. Some expensive weight loss though. $6k or so to lose 40lbs?

Well, exhaust is ~2k euro, wanted to do brake upgr anyway (~3k E) when the stock ones are done. Part of a puzzle i guess
Battery is dying a bit after 4yrs too, so will prob replace with light one.

On other note, cant measure oil level, wonder if is a sensor or a oil pump failing.... I heared 2019 and 2020 models had more plastic fuel pumps, that got changed and upgraded later to metal ones :/

 

[garudathree]

You take 100lb off the front axle you drop a ton of lap time, comparatively speaking.

Is that why you're building the 2.0? what class are you building for this time?

 

[Oodis]

Bloke

biggest weight savings are battery, seats, and hood (carbon one).

There is heaps more areas but unless your going for grand champion of the world cost to savings really probably isnt worth it.

Some of these items you will replace anyway as you get more serious on track.

Cheers

 

[Oodis]

With lightweight battery, drivers side seat and rear diff weight out, I saved 80lbs. Where are you taking out an additional 60lbs?

Bloke what diff you running and how did you get around the electronic bs?

 

[razorlab]

Bloke what diff you running and how did you get around the electronic bs?

Rear diff weight.

 

[kyle9]

Is that why you're building the 2.0? what class are you building for this time?

Gridlife Street

 

[garudathree]

Gridlife Street

If the 2.0 doesn't have side radiators, or had smaller ones, it could be REALLY good for an aero build

 

[Eyelise]

EGT logging is inferred unfortunately and I doubt anyone has run actual EGT probes and logged.

Just don’t run a ton of boost through the oem style turbine housing and you should be okay.

I am having individual EGT sensors placed on each runner of my Elise manifold. Cylinders not uncommonly run at different temps even when the injectors are all well balanced. Hot cylinders are pretty common and it has a lot to do with the intake manifold design. Even more common in boosted builds. On top of that, injectors can fail slowly causing one cylinder to slowly lean out and EGTs to rise. Monitoring is not all about preventing detonation, you have to safeguard those exhaust valves from excess heat too. If you know the actual EGTs you can build in safety parameters (cut ignition) or add additional fuel selectively to the hot cylinders. It's pretty cool stuff.

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