Normally aspirated...

[b-b00gie]

well in the "where to get an SR20DET" thread, they've started getting into the topic of overhauling DE's and DET's...

not to get off topic there, i'm wondering... what in god's name do they do to the BTCC Primera's to get them 300hp??? These cars are normally aspirated which means... no turbos.

just wondering how they get that much hp out of a 4 cylinder engine, and how much labor and money is involved in doing so...

i have a feeling my buddy George will have lots to say here... lol

[primera man]

I have no idea what they would do to get that sort of HP, but i would say you would need a whole heap of cash..
I await with interest as well........

[P10DET]

Originally posted by b-b00gie
well in the "where to get an SR20DET" thread, they've started getting into the topic of overhauling DE's and DET's...

not to get off topic there, i'm wondering... what in god's name do they do to the BTCC Primera's to get them 300hp??? These cars are normally aspirated which means... no turbos.

just wondering how they get that much hp out of a 4 cylinder engine, and how much labor and money is involved in doing so...

i have a feeling my buddy George will have lots to say here... lol

Yep.

In addition to wild port and came work......

They start with a GTi-R block. They turn the head around! Yep, you heard me. They turn the head around so the intake manifold is at the front of the car and the exhaust is at the firewall.

Remember that they only have to run well within a very narrow rev range. So they have huge ports with wild cams that require the engine to idle at 2-3k!

I think they also run something like 13:1 compression. It may even be a little higher than this.

What they basically do is easy to say. What they do specifically is rather secret.

[b-b00gie]

hmm...

well are there any known non-*TCC cars that are normally aspirated and have huge hp? has anyone attempted something like a BTCC engine?


what would the cost comparison be between a 300hp Turbo SR20 or a 300hp normally aspirated SR20??

[P10DET]

Originally posted by b-b00gie
hmm...
well are there any known non-*TCC cars that are normally aspirated and have huge hp? has anyone attempted something like a BTCC engine?

You mean by a non-racer? No. For one thing it wouldn't even be close to streetable. Remember that the BTCC engine idles at 2-3k rpm. It's probably a pretty lump idle as well. And forget passing any sort of smog check. That engine probably has a 2k rpm operating range. I don't remember the redline on the engine, but you can be sure it's well above 8k.

Oh, and I forgot to mention a custom short runner intake manifold.

Originally posted by b-b00gie
what would the cost comparison be between a 300hp Turbo SR20 or a 300hp normally aspirated SR20??

It's a whole order of magnitude difference. I could build a 300 bhp turbo SR20 for under $5k pretty easily. The BTCC engines run around $30-50k.

My SE-R engine (same as Mike Kojima's Project SE-R engine from SCC) cost around $6k. Mike is making right around 200 bhp. There should be more streetable hp available, but Mike seems to have run into a wall that he hasn't been able to figure out yet.

My new SE-R engine should make a fair bit more hp than that, but it's waiting for JWT to get working on it.

[G-Forces]

I was a HUGE fan of BTCC when Nissan was winning. Anyway if you've ever heard those cars coming into the pits you'd understand why you'd never want to drive one on the streets. The idle sounds worse than a farm tractor! :alien:

[b-b00gie]

hehe ok ok.. i can dream cant I??

[G22DET]

P10DET...actually the compression ratio ont he BTCCs Primera are 14:1 so that makes it even more insane and amazing, i also believe they are variable timing motors as well, but not too certain on it.
anyway, it's IMPOSSIBLE to replicate that motor for street use because, first of all, even if you win the lottery, no one in the US would know how.....

[Kenny-G]

....and even you got one of those motor somehow....everytime you need to fill up the tank you need to go....get racing gas.

[primera man]

Originally posted by P10DET



They start with a GTi-R block. They turn the head around! Yep, you heard me. They turn the head around so the intake manifold is at the front of the car and the exhaust is at the firewall.

That is unreal !!!! .......i had to read it 2-3 times to see if my eyes are OK
So what is the idea in doing it ??
Is it a quick way to up compression ??

[b-b00gie]

i had actually read that before too... that they start w/ a GTI-R (DET) and basically remove the turbo.. thats why i was wondering what they do to get so much HP. btw, they arent variable valve...

[P10DET]

Originally posted by primera man


That is unreal !!!! .......i had to read it 2-3 times to see if my eyes are OK
So what is the idea in doing it ??
Is it a quick way to up compression ??

It's done so the air flows in the front and the exhaust exits the rear. Compression is easy. There are several methods to do it. I imagine Nissan employs reshaped combustion chambers to help with quench (this provides denation resistance), domed pistons, and shaved cylinder heads. I'm just guessing though.

The really unreal thing about turning the head around is the area for the chain. That whole bit must be remanufactured!

[primera man]

Cheers for that....i can see now just how much money they must pour into these cars

[GtRider]

About how much HP CAN YOU GET IF U HAVE

INTAKE
EXHAUST
HEADERS
UNDERDRIVE PULLEY KIT
CAMGEARS
CAM
FLYWHEEL
PORT AND POLISH HEAD
BIGGER THROTTLE BODY

[ty423]

I love this setup..