Roman

Flat till after 8 is crazy! Look forward to seeing the end result

Love seeing progress on this. so is the end goal to take the learnings from the bigport head and apply to one of the better ones later on? Imagine how good it would be if it worked out that chopping up silver top 20v heads and converting them to 16v worked out well.

I think I have made a tangible difference to the exhaust noise and it was useful. It was quite a difference in sound when I ran the split pipes compared to initially. I was surprised that having the equal 2-1 but then a single 3" pipe still sounded a fair bit the same as before. But like Markku says, really need the other half of a flyby to hear the exhaust. It was pretty much all induction noise in that clip. And a duck obviously

Its normal inducktion noise

I was kind of expecting to come back to the camera and find a sheep had been standing in front or something. Looked through the vid on back of the camera and thought "cool!" Then man I laughed when I played it on my pc and heard that bloody duck. Haha

Those chrome type days make me nervous aye. Seen a few incidents where someone has put 100 points into horsepower and 5 points into suspension and brakes. Then had predictable outcomes, sometimes involving Gran Turismo style braking into turn 1.

Was gutted I couldnt come watch, looked awesome from the footage. What sort of adjustability do you have in the swaybars? Is it different holes in the rear bar? The Logo is bloody cool as well, there's something to be said for just getting a whole bunch of seat time. The enjoyment of those incremental improvements and gains is the same with everything I reckon. Please dont ever change or break the front bumper @Rhyscar its absolutely iconic for this car and looks mega.

Alright so this is the final in my punishing Car is up on stands series of posts. (maybe) Video first then nerd stuff second After all of the headaches and frustrations I've had from persisting with ethrottle. I'm finally starting to see some of the rewards. My ethrottle tracking is stable and reliable enough that I can start doing some part throttle tuning decently. Ethrottle makes it super easy because you can make it so any pedal travel over 20% limits the motor to 20% throttle, if you want to tune the 20% row. This engine has been real fiddly in a few areas at low rpm and low load where it goes atkinson cycle and/or transitions out of it. I've also got some bank to bank imbalance. Although that's annoying, it's at least consistent now. So I'll just build a compensation table for it. It might seem silly having the car up on stands compared to driving it or going to the dyno. But using the wheels and gearing as a flywheel allows you to reach some low load and low rpm spots that are very hard to get to otherwise. I spent some time going through the 3%, 5%, 10%, 20%, 50%, and 100% rows and the interpolated between. So it's good enough to take it for a drive without any surprises. It hasnt had any issues with vibration etc causing problems anymore which is great. Some of my previous VE improvements were a little misleading, because it had jacked up the injector spray time to pretty much fully open. Which doesnt flow proportionally as much as 85% or whatever. So with the new intake, diddling the ports a little bit, bigger injectors and the new exhaust setup. This is the full throttle VE table differences now that the motor is tuned back to target. Pretty hectic at 6500rpm for reasons unknown! But it does the same thing every time. Maybe adjusting injector timing or VVT angles will drop the number there to something more realistic. Supposedly you can estimate power increase by taking between 50% and 90% of the VE increase as % of power gained. So splitting the difference and on the basis of 75% of VE increase = power increase, it's probably maybe looking something like below. I'm guessing the 6500rpm thing is some sort of weird VE oddity and it wont actually make power peak there. I will be annoyed if it's peaking at 6500 on the dyno next time haha. Will be weird to shift to the next gear and end up with better power... If the rest of it is somewhat accurate, will be happy. I'm circling the drain towards having smaller and smaller problems to resolve which is great. I'm currently mucking around with the VVT PID settings a bit more, as one side is still oscillating slightly. Then both exhaust pulleys are a bit sluggish to reach target. This is what the intake is doing while cruising: PID stuff is annoying to figure out, so I've just taken a log of the results and dumped it into chatgpt along with my existing settings. It's given me some new numbers to work with, hopefully it'll hone in on some good settings in fewer iterations than using my potato brain to guess at it. I took the car for a drive up the road and nothing fell off, and all of my rockers sound like they are still in the right place. So, in the context of this absolutely snakebit project that is a huge win. Haha.

As per usual with this cursed machine, some good and some bad. Haha. My ethrottle bits turned up, and they had accidentally printed them out of stainless. So they're way heavier than expected. Not only that but they were absolutely impossible to try and drill or tap holes into. I broke a few taps, then just tried drilling. Ended up melting some drill bits. Anyway, they're going to reprint them for me from aluminium. But in the meantime I fitted them up so I'm not stuck for another 6 weeks waiting. Looks kinda weird but they are working great. Next thing, I finished doing a 1-2 pipe over the diff. Was a bit fiddly making space for 2 pipes but everything's good. Then checked for leaks and what not and back to the usual jack stand hoons. Doesnt sound quite how I want it yet, but I am sick of doing exhaust work and just wanna go drive it. So thats the next plan! While its up on the stands I just need to add a few heat shields and move some lines to keep fuel stuff a bit further away from the hot pipes. But hopefully not too long until it's good to go.

She's a mighty beast to tame.

I see the problem. Rallies are run on stages not sektas

That shifter surround looks great! I've never tried TPU, Does it end up wobbling around or sagging as you try to print it? Definitely useful to be able to print rubber type materials.

I've got a weird old car and now a weird engine in it. This is fine, but sometimes it would be nice if there were a whole bunch of other people with the same thing so we could compare notes. My existing process has been a lot of trial and error at trackdays to get the car handling nice. The problem being that over the course of my ownership, at best I could probably get to a track event 2 or 3 times a year. So it's hard to get a feel for the effect of subtle changes. My new engine (not track tested yet apart from drag strip) revs a lot higher than the old one. Which is problematic for my existing gearing. I've got a 6 speed box but now 2nd gear will run right to 130kph which is fairly stupid. So I've been considering my options for changing final drive ratios. It's all well and good looking at the graphs and numbers, but I dont think this gives a particularly good idea of how the car might feel. So I've setup my car in a simulator to try and get a general feel for how various changes might impact it. The PC game called Assetto Corsa is very highly moddable which is great. There's no Toyota Carina model in the game. But each car essentially has all of its important stats set via a series of text files that you can edit. I've taken the base model of an AE86 coupe and then revised it to the known details of my car which are slightly different for wheelbase, weight etc. What's cool though, is that using Chatgpt/codex I can have it sift through a whole bunch of real life data, to input into the game to refine the model. I figure that if I can tip as much real life information into the simulator as possible, I'll get a baseline that is as close as possible to reality. So any changes that I make from here, will have a reasonable chance of being realistic. I've got four pretty good sources of historical information about the car. Corner weights, Dyno results, ECU logs, and GPS data. I've fed the dyno results image into chatgpt to build the power curve of the motor in the game. Then it's used the corner weight info to set the weight distribution and overall weight. I've fed my ECU logs into it, as these have a very good record of gear shift times, engine free revving rate, coast down rate etc. Then I've fed the GPS data in. From which it analyzes average corner speed, low corner speed, high corner speed, braking rate etc. To develop a tyre model for the car based on real life data. Then also total braking force. I had a really good laugh when the best lap time I've managed after about 30 laps in the game so far. Matches my PB in real life. How this has been useful: I was initially thinking that I would need around a 6:1 final drive ratio to make all of the gears usable. But with some testing it was actually incredibly annoying, as it needed a lot of mid corner gear shifts. I've found that my diff size (Toyota F series) has an off the shelf 5.3 ratio that is commonly used for off roading. This is looking like the best overall compromise and gives a top speed of around 220kph which is plenty enough for an Toyota made out of bean cans. My car has always been very softly sprung compared to what other people run. I believe this is because I've had an excessively stiff front swaybar, and I've just made the rest of the car work around that. So I've been using the sim to get a feel for what sort of front spring rate might pair well with a softer bar. It looks like going to around a 200lb front spring will work really nicely. Or at least be a very good starting point compared to a stab in the dark. I cant wait to finally get my car back out there again, and see how the new setup works out. On a more modern tyre and with the new engine, should be a few seconds quicker than a 1.21 hopefully. It's felt well worth the effort of a few rainy days inside to get the car setup this way to test some iterative changes and see what's worthwhile or not. Unsurprisingly, putting a grippier tyre on seems to be exponentially more beneficial than any other slight fiddling of suspension settings.

It's not really any benefit over a traditional X pipe in terms of sound/power. They'll have just been sponsored one for free, there's no way they'd actually buy it haha. This 2GR sounds awesome though! So yeah... definitely can be done. But this car must be brain meltingly loud. no mufflers etc.