boofhead A12GX dyno run : Datsun 1200 Club

Main Menu

Home News Forum Photo Album Popular Top Rated Tech Wiki Downloads Web Links Polls FAQ Members Map

Fast Search

Slow Search

Google Ad

Main :

boofhead boofhead A12GX dyno run

boofhead A12GX dyno run Popular

boofhead

2007/5/27 9:27

3280

0.00 (0 votes)

dynosheet printout for A12GX

The comments are owned by the poster. We aren't responsible for their content.

Poster	Thread
boofhead	Posted: 2007/5/27 9:31 Updated: 2007/5/27 9:31
No life (a.k.a. DattoMaster) Joined: 2004/2/10 From: torquay, victoooooria, australia Posts: 2246	Re: boofhead A12GX dyno run had a couple runs at a dynoday unfamilia organised and these are my figures !!!! watched my video of the 2nd run and checked the figures thru the revs ... 119kmh @ 4840rpm - 42.1kw 128kmh @ 5200rpm - 44.5kw 145kmh @ 5880rpm - 49.4kw 158kmh @ 6400rpm - 54.6kw 161kmh @ 6520rpm - 59.0kw run in 4th gear, 4.11 diff, 185/45/15 tyres i'm happy as first guestimate of what i'd be happy with was 50-55kw ... but to pull out 59kw was awesome. smallest capacity, naturally aspirated, biggest noise and not the lowest kw (sorry mik) kind of made the 4hrs of waiting worthwhile .... only concern is the curve is really jumpy, kind of /\ /\ /\ /\ as the curve climbed ... will be off with the printouts to see my mechanic down here during the week for his opinion. edit : this is the specs : A12 - 1204cc, all balanced. 9.8:1 static compression gx head, all new bits 66/30 cam electronic ignition, graphed to suit cam 4-1 hitech extractors to 2.5" collector, 2.5" mandrel bends with single 2.5" baffled muffler before the diff. running twin 40s with 30mm chokes. carb settings for the motor spec above .... 40mm DCOE webers x 2 chokes : 30mm Aux venturies : 3.5 Emulsion tubes : f11 Main jets : 125 Air correctors : 175 idle pumps : 35 pump Valve : blank pump rod : 54mm stroke idle jets : 45F9

Poster	Thread
MLS	Posted: 2007/5/27 10:20 Updated: 2007/5/27 10:20
Just can't stay away Joined: 2004/12/10 From: Melbourne Posts: 145	Re: boofhead A12GX dyno run Good to hear it has worked out well for you. Did you happen to get any AFR readings whilst on the dyno?

Poster	Thread
1200rallycar	Posted: 2007/5/27 10:23 Updated: 2007/5/27 10:23
No life (a.k.a. DattoMaster) Joined: 2002/3/20 From: Melbourne, Australia Posts: 8221	Re: boofhead A12GX dyno run converting km/h to rpm is pretty easy with tyre size diff ratio and gear ratio...

Poster	Thread
boofhead	Posted: 2007/5/27 10:40 Updated: 2007/5/27 10:40
No life (a.k.a. DattoMaster) Joined: 2004/2/10 From: torquay, victoooooria, australia Posts: 2246	Re: boofhead A12GX dyno run air/fuel ratios ... rich down low and about right up the top in the revs

Poster	Thread
boofhead	Posted: 2007/5/28 8:13 Updated: 2007/5/28 8:13
No life (a.k.a. DattoMaster) Joined: 2004/2/10 From: torquay, victoooooria, australia Posts: 2246	Re: boofhead A12GX dyno run saw the mechanic today and he was wrapped with the results. he assures me the jumpy bits are nothing to worry about and this is common with carb engines, but as the curve climbs nice and evenly which is what counts. eagerly waiting on ferals comments as he was the engine builder, i've sent him an email and now to just wait

Poster	Thread
1200GXman	Posted: 2007/5/28 8:39 Updated: 2007/5/28 8:39
No life (a.k.a. DattoMaster) Joined: 2003/11/28 From: South Africa, Bloemfontein Posts: 1469	Re: boofhead A12GX dyno run Congrats mate. I must take mine also again for a dyno run. But not before I make some mods. I want to remove the mechanical fan first. My carbs have been tuned since then. It made black smoke at high rpm. It pulls much better now at higher rpm. Will let you know what I get and then we can compare. Mind you that I am not at the coast but inland.

Poster	Thread
1200GXman	Posted: 2007/5/28 8:42 Updated: 2007/5/28 8:42
No life (a.k.a. DattoMaster) Joined: 2003/11/28 From: South Africa, Bloemfontein Posts: 1469	Re: boofhead A12GX dyno run Did'nt want to edit my other post. Is this power on the wheels or engine? What is with the torque? 208Nm. That is damn strong for a 1200cc engine.

Poster	Thread
boofhead	Posted: 2007/5/28 8:44 Updated: 2007/5/28 8:44
No life (a.k.a. DattoMaster) Joined: 2004/2/10 From: torquay, victoooooria, australia Posts: 2246	Re: boofhead A12GX dyno run cheers, its at the wheels, in fouth gear (60series 5spd box, so i'm not sure of the gear ratio ??)

Poster	Thread
PIGDOG	Posted: 2007/5/28 9:12 Updated: 2007/5/28 9:12
No life (a.k.a. DattoMaster) Joined: 2004/10/28 From: Geelong, Vic Posts: 6184	Re: boofhead A12GX dyno run id be thinking it would be 1:1 4th....like most gearboxes

Poster	Thread
boofhead	Posted: 2007/5/28 10:10 Updated: 2007/5/28 10:10
No life (a.k.a. DattoMaster) Joined: 2004/2/10 From: torquay, victoooooria, australia Posts: 2246	Re: boofhead A12GX dyno run found a box spec and you're right 1:1 in 4th .... but not all boxes are 1:1 4th gear - 56A option 1 boxes run a 1.291 56A option 2 boxes run a 1.181 56A GX5 boxes run a 1.254 ............

Poster	Thread
MLS	Posted: 2007/5/28 10:22 Updated: 2007/5/28 10:22
Just can't stay away Joined: 2004/12/10 From: Melbourne Posts: 145	Re: boofhead A12GX dyno run The AFR's do look a little rich throughout the whole range. Might be worth trying to go down to 115 - 120 main jet and also drop the air corrector to 165, should give a cleaner response throughout the range as well as picking up a lilttle extra power. 12.5:1 right across the range is a good place to aim for, keep in mind that on initial acceleration the afr will drop a little because of the accelerator pump activating.

Poster	Thread
boofhead	Posted: 2007/5/28 10:28 Updated: 2007/5/28 10:28
No life (a.k.a. DattoMaster) Joined: 2004/2/10 From: torquay, victoooooria, australia Posts: 2246	Re: boofhead A12GX dyno run hmmmm ... will speak with the carby guy and see what he has in parts. cheers MLS and thanks again for the starting pointers

myAlbum-P 2.9 (original)