Duke Racing Celica GT-Four Time Attack Racecar

[GDII]

That will look awesome. 70 degrees is pretty high for intake temps. I thought water to air intercoolers were better than air to air. Unless that is just the top mount situation where air to air gets heat soaked badly.

@ ITCC_Andrew, the turbo is at the front of the car behind the radiator, unless I misunderstood how you described it's location.

 

[ITCC_Andrew]

That will look awesome. 70 degrees is pretty high for intake temps. I thought water to air intercoolers were better than air to air. Unless that is just the top mount situation where air to air gets heat soaked badly.

@ ITCC_Andrew, the turbo is at the front of the car behind the radiator, unless I misunderstood how you described it's location.

Was posting from mobile, didn't see photos or research.


Most cars have intake at the front of the car, exhaust at the back. The exhaust gases are the ones that spin the turbine that pressurizes the intake gases; losing some heat from the exhaust gases would help to cool the turbo itself, and therefore also the intake gases.

 

[GDII]

That makes sense. Most cars I know of pre 2005 have the intake manifold on the back below the base of the front window and the exhaust manifold at the front of the car. (east-west engines) This has changed in recent years to how you have described. Well at least in Japanese cars. And yes getting decent airflow over the compressor turbine would help reduce intake temps.

Picture of this cars engine setup.

 

[ITCC_Andrew]

I only know where the intake and exhaust manifolds are on most of the cars around here. Cars don't last too long, 90s cars are normally useless rust buckets.


My Impreza, though, has exhaust manifold towards the back; it saves exhaust plumbing, and draws in colder, fresher air for intake, from the front.


I thought all motors were rotated that way, if they weren't mounted front-to-back. Assumptions...


I can tell the two manifold types apart, yes, but I only know their location if I actually look.

 

[Punknoodle]

GDII - yeah the water to air is better than the air to air on top that suffers heat soak, but at speed will never be as good as an air to air front mount, in terms of actual cooling - the charge is being cooled directly by the cooling source (the fresh air on the intercooler) as opposed to another medium being cooled by the cooling source, this makes it more efficient.

Where the water to air has advantages are at low speeds and in traffic, as water is more resistant to temperature change and so can maintain it's cooling effect after the car has been stationary for a short time, and also there is less piping that can be heated by the heat of the engine bay, and generally less piping means less lag.

In theory my intake could get fairly hot in traffic with a front mount as opposed to the current set up, I do live in a pretty hot environment after all, but no worse than it was with the top mount air to air, and generally when I'm doing stop start driving I'm not heavy on the accelerator anyway. Where I need my cooling is when I'm hard on the accelerator and the car is going fast!

Also, it's been said that while Toyota really got the design right for the ST205 charge cooler, the air just doesn't get enough time within the cooler, as it's quite short, to get cooled properly. These charge coolers are supposed to support quite a bit of horse power, but obviously my heat exchanger is crap and isn't cooling the water good enough, I don't know. But I may as well go the whole hog and do it properly with a front mount, plus the water to air is fairly heavy. And because I've modified mine professionally to bolt in to the ST185 and they are quite sought after as an upgrade for it, I should be able to get a good price for it when I sell it.

And yeah I really am looking forward to the new look. I'd love the bonnet too but it's not necessary at the moment, having a vent as opposed to a scoop would be better for cooling though, but I think the large opening on the new bumper will increase flow to the radiator nicely.

 

[ITCC_Andrew]

"sell it?"



You're going to sell it?!

 

[Punknoodle]

The water to air system, not the car

 

[Thatman]

Couldn't you have run with no hood at the track?

 

[Perfect Balance]

Don't run with no hood. Makes your car look haggard. Make it work properly instead. That's gonna be better.

 

[GDII]

It would look terrible without the hood but I'm also guessing that, being Australia it wouldn't be allowed?

 

[ITCC_Andrew]

The water to air system, not the car

Ah, good good.


All the better, I can't afford one yet. If you ever end up selling the car (a sad day... In its own right) at least make sure it goes to a good place.

 

[Punknoodle]

Indeed, I wouldn't be allowed to run without a hood even if I wanted too. Time attack rules mandate that all my body panels are required, and I'm sure the Queensland Raceway have a requirement for a bonnet to be in place for safety reasons.

And yeah, it's important to me for something to be working properly, also going the route of a front mount means my intake temps will be lower, so my ECU shouldn't start pulling timing, which it was doing - I could feel the car getting slower and slower as the ECU pulled timing to protect the motor due to the high temps.

When I get the car retuned to suit the intercooler I'll also get the boost increased to around 17psi which should give me a small increase in power. I had it tuned to 15 last time because it has a ceramic turbine wheel and because the charge cooler is known not to be very good past 15, but with that issue no longer there and a friend of mine running 18 psi out of the same turbo for 5 years, and not taking it easy either, I think it will be fine.

 

[Thatman]

I wasn't saying to not make it work the way it should, just for the time you were out on the track.

 

[Punknoodle]

Nothing much been happening with the car lately - my partner is due to give birth to our baby in about 4 weeks, so all the focus is on that, at the moment.

I did take it down to A.R.E (the guys that modified the charge cooler for me) and spoke to them about my cooling issues - he told me that the new bumper would definitely make a difference, and that the coolant temps shouldn't be getting effected by the heat exchanger mounted in front of the radiator as air flow through it looks good and suggested I look at other reasons for the temps - including checking that the Toyota coolant temp sensor was calibrated in the ECU correctly.

My plan is to buy a Haltech sensor and install it and get the guys at Mercury to set the sensor up in the ECU as a Haltech sensor, that way it's guaranteed to be calibrated. It's possible to enter the Toyota sensor data in to a calibration table, which I thought was done, but a new sensor is the easiest way. It's not terribly expensive.

I may end up keeping the water to air set up if the bumper and some good ducting helps. Wouldn't mind finding a group a bonnet (with the vent as opposed to the scoop) which would help hot air to escape and aid airflow through the bumper/radiator.

Still yet to install the diff and subframe bushes.

Anyway, I'm driving someone and their date to their school formal tomorrow night, so tonight I washed it. Here's a quick picture:

 

[Punknoodle]

Welcome to the newest little racing nut! Born 3 weeks early, he's doing really well and so is his Mum, who did an awesome job giving birth to him - he was delivered in the birthing pool with no drug assistance at all, I'm so proud of her

Just shy of 6 lbs, his name is Bastien Elijah

 

[Korza]

Congrats man! 👍

 

[GDII]

That's awesome news. Congratulations.

 

[Cano]

Awwww dude that's freaking cuuuuute, and I don't normally say that of newborn babies congratulations!

 

[speed junkie]

Congratulations!

 

[Paulie]

Congrats Nick. 👍

 

[Punknoodle]

Thanks guys

 

[Punknoodle]

Well, seen as how no progress has been made on the car lately, I have been playing on GT6 - this is as close as I can get to driving my car on Mt Panorama:

I've modified it with the same modifications as mine (sports intake, exhaust and cat, ECU and sports suspension) but kept the came Comfort Softs on it that it came with, as I think those are the most realistic in grip. Found wheels and paint that matched close enough too

 

[TouringBubble]

Ive always loved to GT Four. I have only ever seen one in person. Its one of the few WRC base cars that actually made it to the US in those days.

 

[Punknoodle]

Some of you eagle eyes may have already noticed the tow straps on the car from my track day photos. Well, I haven't taken them off yet, kind of like the look of them actually, if every car is allowed one boy racer look at me accessory, those will be mine, for now lol.

Can't wait till I order the new bumper, it will improve the look of the car dramatically and hopefully sort out the temps. I have already bought a replacement Haltech Coolant Temp Sensor, so I'll swap that out and get my tuner to adjust the calibration settings, that way I can be sure the temperature the ECU is getting and logging is accurate, at the moment the sensor is a Toyota one, and I'm relying on the tuner doing an accurate calibration for it within the tune - with the Haltech sensor, the calibration just needs to be set to "Haltech Coolant Sensor" and the ECU will already have the proper calibration table for it.

 

[Punknoodle]

So this is what a Haltech IQ3 dash looks like in my car, running off my Haltech ECU. It's awesome, out of the box everything works, gear readout, speed, temps, RPM etc.

This is actually my friend's one. He has just got it and I'm wiring up his ECU for him and we wanted to see what it looks like so we tried it in mine..

Next purchase after the bumper??

 

[Hayden]

That looks absoloutley awesome.

That digital speedo would be real useful on a daily too. I'm definitely a fan 👍

 

[Punknoodle]

What does everyone think of this lip? That is the bumper I'm getting, the lip is an aftermarket one I can get from Europe, postage is going to be damn expensive though if I choose to get it.

If I was to get it, stay body colour or maybe go black?

 

[TheBook]

Personally, I think it makes the front look way too massive. Maybe it would look better if it was black, but I wouldn't go body colour.

 

[Korza]

I like the lip personally. I reckon it'd look quite good in black on your GT-Four.

There's a guy here in NZ that builds replica body kits out of FRP to order. Maybe you could get one made and save on the shipping.

 

[ITCC_Andrew]

What are the laws about splitters in Brisbane? That looks like a proper motorsports lip without the splitter... Are you allowed to have a "detachable" splitter, which can be used on a track and taken off on the street?