Throttle Bodies

**Valver.** · 08-05-2008, 07:34 PM

I can reel off pages of crap about this, but there's no point. It really comes down to whether or not you have the funds to build a race motor with the volumetric efficiency to use (... or need) the extra intake potenial.

When you get the motor to this point, it's so peaky that you also need to address the gearbox, which isn't just a matter of changing the ring and pinion, as this slaughters any notion of top speed, it means swapping in a whole new gearset.

It goes from a $5000 exercise for a nice sound to a $30,000 exercise for a well-performing engine and driveline.

I hate turbo cars, but I've built one, as VW engines don't perform well without a turbo, and I like VWs...

**tassie_euro_mk1** · 08-05-2008, 08:21 PM

mmm maybe theyre not the go. I just thought they would of been a good alternative to the twin side draught webbers.

ah well I have time to ponder these things. Thanks for the input guys. I appreciate it.

I mean I was thinking of having an engine with power at around 170hp - 200hp???

**Valver.** · 08-05-2008, 09:09 PM

Having been there and done that, I'd spend my money on high class headwork and cams and a good value ECU, like an Autronic SMC. You can make a very torquey ~185hp 2.0 16v on standard induction due to the long stroke of these engines. They don't rev near as well as a Honda because of this, but they develop torque nicely and still go to high 7k rpm safely with a few tweaks

Other option is KR or PL 1.9 conversion, if you want a better-revving setup.

11-11.5 compression is the ultimate for a street 16v too.

**Preen59** · 08-05-2008, 09:10 PM

Originally Posted by tassie_euro_mk1

mmm maybe theyre not the go. I just thought they would of been a good alternative to the twin side draught webbers.

ah well I have time to ponder these things. Thanks for the input guys. I appreciate it.

I mean I was thinking of having an engine with power at around 170hp - 200hp???

I'm building a 1.9 16v on twin 45 DCOEs. From what i've read and from talking to Techtonics Tuning, it should have about 200 or a bit more with the config i'm running.

The thing you have to remember is, ATMO horsepower is made with RPMs.

Horsepower is simply BMEP (brute mean effective pressure) times (x) RPM, so because you aren't filling the cylinder well to get a high BMEP, you have to rev the engine harder to produce more cycles in the same time span. That is why a forced induction engine will always have more torque.

The other issue is, the higher in the RPM range the engine makes its power, the crankier it will be at low RPM, and it will be very dull down low.

**GoLfMan** · 08-05-2008, 09:10 PM

Originally Posted by tassie_euro_mk1

I mean I was thinking of having an engine with power at around 170hp - 200hp???

that'd be easily accievable on a 16v on twin webers mate, just look at what Preens doing with his engine, that should put out over 200hp i recon

**Valver.** · 08-05-2008, 09:11 PM

My ABF that was in the blue Mk1 went really nicely with a good head, basic cams, extractors and a chip to suit. 112kW atw IIRC (will confirm tomorrow).

**Valver.** · 08-05-2008, 09:13 PM

Originally Posted by GoLfMan

that'd be easily accievable on a 16v on twin webers mate, just look at what Preens doing with his engine, that should put out over 200hp i recon

150kW is a lot harder to come by than US dynos show, believe me!!

**Preen59** · 08-05-2008, 09:51 PM

Originally Posted by Valver.

150kW is a lot harder to come by than US dynos show, believe me!!

Yeah thats very true. Also depends on the altitude its dyno'd at. Benny is getting new a wheel dyno in the new shop so when i get the donk done i'll tune it on there first up and get some figures, keeping in mind we're like 850m above sea level.

The other thing is too, have you ever driven a car with anywhere near 200hp and less than 900kg?

You're talking about a bloody fast street car. My mate has a 200hp atmo (2l pinto engine) Mk1 escort road registered race car, and it breaks traction in third gear at 50kmh with grooved Avons. It weighs about 900kg and its FAST. hits about 235 or a bit more into turn one at eastern creek, it's as quick as a modified EVO 7 in a straight line.

Heck, my little 1.7 donk was a quick little engine, and it only had (i reckon) about 130hp.

**peedman** · 08-05-2008, 09:54 PM

My mk1 with a stock kr with efi scared the cr ap out of me, i cant imagine even more power in it. One thing is for sure tho, it needs better brakes and i need bigger biceps to turn that steering!!