TECH TALK - ask your technical car questions

boganbusman · Post by **boganbusman** » 24 Jul 2006, 11:38

If he wants a larger intercooler and a wastegate, then the next logical step would be a new turbo.

Do you have a pic of it? (i don't even know what it is yet

)

Edit: I've also edited some comments I made on pages 2 and 3. Some of the stuff I wrote wasn't correct, or wasn't explained properly.

steelsnake00 · Post by **steelsnake00** » 24 Jul 2006, 13:28

TDI turbo changes are often shunned upon because it requires alot of work. Uprated cooler + remap + cams + wastegate should be all good.

PSZeTa · Post by **PSZeTa** » 25 Jul 2006, 11:08

http://www.wawrosz-chevrolet.com.pl/obr ... 28.134.jpg

That's the feared monster, the Mitsubishi Carisma. Just a random picture off Google. The body is somewhat close to the Lancer, it's possible to fit a Evo VI bodykit on it with a few small mods. The car is a higher class POS, Dutch made and uses parts from other brands. ( Shares chassis with older Volvo S40 and engine is from the Renault 19 )

steelsnake00 · Post by **steelsnake00** » 25 Jul 2006, 14:51

Yay, the mitsu Charisma
One of the worst cars ever built. The only automatic I know of that has a habit of stalling.

Toshiro · Post by **Toshiro** » 26 Aug 2006, 19:42

I've been wondering about this for quite a while....

Is a RB26DETT swap-able into a 350Z?

PSZeTa · Post by **PSZeTa** » 26 Aug 2006, 22:24

Everything can be made to fit.

boganbusman · Post by **boganbusman** » 27 Aug 2006, 01:24

Yeh, but I think it would be a lot of work.

The 350 has a V6, and I imagine that the RB26 is a fair bit longer. That means you would have to move the firewall back, and I would not recommend doing so on a street car. The engine would be sticking into the cabin, and it would get very hot and noisy. I would only do it if you're making a race car, but it's still a pretty extreme operation for the average driver.

WonkaVW · Post by **WonkaVW** » 30 Aug 2006, 20:01

Regarding the diesel, the ECU and cold air intake aren't going to do much by themselves. My friend's Mk3 TDI Golf has a 1.6TD I believe. It runs around 8psi stock, he has it at 12 or so right now but we were playing around with it peaking at 26psi a couple of weeks ago (after running it like this for more than a couple of days, he broke a couple of things).

A couple of things to make power in disels are: raising the boost, raising the fuel delivery to match the raised boost (if you just keep raising the boost, you'll be running too lean soon enough), put in an intercooler to keep things cool, consider a larger than stock exhaust system.

Grez~Supra_RZ-S · Post by **Grez~Supra_RZ-S** » 31 Aug 2006, 11:58

WonkaVW wrote:
A couple of things to make power in disels are: raising the boost, raising the fuel delivery to match the raised boost (if you just keep raising the boost, you'll be running too lean soon enough), put in an intercooler to keep things cool, consider a larger than stock exhaust system.

All the things that are used to make petrol engines more powerful.

Remember, diesel and petrol engines arent all that dis-similar, and the basic concept is the same.

WonkaVW · Post by **WonkaVW** » 02 Sep 2006, 06:59

They're very similar indeed... I find diesel to be more fun to work with though. Awesome on the wallet too

steelsnake00 · Post by **steelsnake00** » 04 Sep 2006, 18:49

WonkaVW wrote:They're very similar indeed... I find diesel to be more fun to work with though. Awesome on the wallet too

Not awesome on the wallet when you start aiming for high hp figures...

Grez~Supra_RZ-S · Post by **Grez~Supra_RZ-S** » 04 Sep 2006, 19:20

Diesel engines are generally quite fun as theyre torquey. Much the same appeal as large displacement engines.

steelsnake00 · Post by **steelsnake00** » 06 Sep 2006, 01:46

Aye, that's true. I've recently driven a REVO re-mapped A6 3.0TDi. and the torque was astounding.
Tech question? Does anyone know any companies that offer large (10 inch plus) dishes for BBS Split Rim alloys? The Corrado is currently on a second hand set of BBS RM alloys with titanium bolts and centre caps, but I want them to fill the flared arches up to the point that rolling them is nessesary, and am looking for a large enough dish
I've tried Just_matz and they only offer sizes up to 8.0, I really need 10's or 11's for that wide-boy look...

Grez~Supra_RZ-S · Post by **Grez~Supra_RZ-S** » 06 Sep 2006, 12:24

In all honesty, theres only really Skylines/Supras etc that can pull 10s/11s on the back wheels off. I would have thought 8s or 9s would be fine.

steelsnake00 · Post by **steelsnake00** » 06 Sep 2006, 23:42

It's inspired by N13E BM, a euro-look E36 328iS, which is running 11x17's all round and has the most incredible stance. I'm running 7.5 or 8.0's as it is and they just don't stuff the arches to lip-rolling proportions, which is what I'm looking for.

RVD · Post by **RVD** » 05 Oct 2006, 17:31

Why are diesels a lot more fuel efficient then cars on petrol, and why cant a diesel make as much rpm's as a petrol??

Grez~Supra_RZ-S · Post by **Grez~Supra_RZ-S** » 05 Oct 2006, 21:59

IIRC, Petrol is a lot more volatile than diesel, and so burns more, hence lower MPG. Having said that, I could be talking out of my bumbum there.

Diesels have lots of low-down torque due to the bore of the cylinders being much longer than a conventional petrol engine. The low-down torque means that power is made early on in the rev band, and so doesnt need the high RPMs of a petrol engine.

boganbusman · Post by **boganbusman** » 06 Oct 2006, 03:12

Hmm . . . I kind of get what you're saying Grez, but it's all topsy-turvy

I'd say that diesel is more volatile than petrol, and diesel engines have a longer stroke

So, a diesel engine is more fuel effiecient because diesel burns better, and it can't rev very high because the long stroke and heavy internals won't allow it to.

Grez~Supra_RZ-S · Post by **Grez~Supra_RZ-S** » 06 Oct 2006, 09:43

Thats the word I was looking for. Thats a lesson right there kids - dont drink and type.

vanyots · Post by **vanyots** » 06 Oct 2006, 10:29

boganbusman wrote:Hmm . . . I kind of get what you're saying Grez, but it's all topsy-turvy

I'd say that diesel is more volatile than petrol, and diesel engines have a longer stroke

So, a diesel engine is more fuel effiecient because diesel burns better, and it can't rev very high because the long stroke and heavy internals won't allow it to.

You got it all wrong!
Diesel is burning slower than petrol and is less volatile! The high fuel efficiency comes from the extremelly high compression ratios(16-24:1) of diesel engines and the very poor air:fuel mixture! The diesel burns more effectively and the longer stroke help convert more heat into power. And because of the slow burning of the diesel fuel it becomes very inefficient at higher rpm - there's not enoght time to burn and produce energy.

RVD · Post by **RVD** » 06 Oct 2006, 16:13

Grez~Supra_RZ-S wrote:Thats the word I was looking for. Thats a lesson right there kids - dont drink and type.

LOL

thx guys, i kinda get the point...

and i came up with another question:

really fast motorcycles ( don't know if you're really into it but: bikes like Suzuki GSX-R 1000, Kawasaki ZX10R etc...) have an incredible high amount of power, looking at the size of the engine. Now, supercarmakers, like ferrari, koenigsegg, are building supercars with a lower power/size ratio. why??? is it so hard to do. and does it mean the superbike engineers are better at doing theyr job than supercar engineers???

(lets say the bike's engine is 1000cc. it produces 180 bhp. supose a supercars engine is 6000 cc, and it puts out 600 bhp. the engine size is 6 times bigger, but the amount of power is only 3.333 times bigger )

baadmw · Post by **baadmw** » 06 Oct 2006, 18:11

bike engines rev ALOT higher.

Grez~Supra_RZ-S · Post by **Grez~Supra_RZ-S** » 06 Oct 2006, 18:54

Bikes also weigh a LOT less, so dont require the torque that a car engine needs.

RVD · Post by **RVD** » 06 Oct 2006, 21:11

baadmw wrote:bike engines rev ALOT higher.

yes, but thats mainly because the bike's engine is alot smaller

Grez~Supra_RZ-S wrote: Bikes also weigh a LOT less, so dont require the torque that a car engine needs.

yes, but still, its a big difference. And im only discussing the engine here....

vanyots · Post by **vanyots** » 06 Oct 2006, 21:30

RVD wrote:yes, but still, its a big difference. And im only discussing the engine here....

Well about your dream 6L engine with 1100HP at 12000rpm - it would have to be 24cyl to keep the geometry and the 5-6cm stroke for such high revs! And it will burn petrol like an army tank

The torque will be enough (650-700Nm or 500lbft) but will come at high rpm.

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