Author Topic: Buildup: My quest for NA 280 hp (Read 156686 times)

DaveM-sport · « **Reply #135 on:** August 12, 2011, 05:21:03 PM »

Yep, they work very well but our track cars are also for drifting so wheels were getting caught on full lock.

So solution was stock shaped arms but with adjustable rose-joints at the outer ball-joints. Don't give as much adjustment as the ones pictures above but offer the best compromise for our application.

I'll be making the same sort of thing as in the above pics for my track/race car though as it won't need as much lock.

fabe · « **Reply #136 on:** August 13, 2011, 09:47:41 PM »

Anyone here tried a single throttle setup with long runners to a big volume intake plenum instead of ITB setup, with additional bank of 4 injectors further up the intake runners (for high rev range only)...
The 2nd bank of injectors further up the intake port, in theory, allows better air/fuel mixture especially for high rpm range where the intake air velocity is high.

The tricky part is to set up the ECU to control the 2 sets of injectors especially the switchover point where the original bank of injectors has to be shut off completely. And maybe the 2nd bank of injectors has to start squirting fuel a wee bit sooner before the 1st bank is shut off (due to the longer distance from the intake port).

This M42 from Thailand is running 2 banks of injectors (http://www.bangkokclassiccar.com/forum/index.php?topic=19247.360)

DaveM-sport · « **Reply #137 on:** August 15, 2011, 05:56:37 PM »

Like this???

fabe · « **Reply #138 on:** August 15, 2011, 08:23:51 PM »

Quote from: DaveM-sport;106113

Like this???

But this one only single bank but placed further up the runners. more for race application rather than for street...

DaveM-sport · « **Reply #139 on:** August 16, 2011, 03:16:29 AM »

Yes, but I meant the position of them and the plenum design with one tb.

The S42 had what you are thinking about like the picture you posted although they had slide ITBs rather than a single tb before the plenum.

Could easily fit an extra bank to an M42 with even the stock inlet. Would need an ECU to control it though.

wazzu70 · « **Reply #140 on:** August 16, 2011, 04:01:15 PM »

Why wouldn't you just increase the injector size to what is needed? Modern injectors have way better spray patterns to promote atomization.

This is especially true for injector sizes an M42 would use, even at S42 power levels.

Most decent ECUs also let you change spray angle with RPM which helps both idle and top end.

romkasponka · « **Reply #141 on:** August 17, 2011, 01:59:14 AM »

Quote from: NickHertlein;106130

Why wouldn't you just increase the injector size to what is needed? Modern injectors have way better spray patterns to promote atomization.

Better atomization....

E36-italia · « **Reply #142 on:** August 17, 2011, 02:21:08 AM »

Quote from: DaveM-sport;106118

Could easily fit an extra bank to an M42 with even the stock inlet. Would need an ECU to control it though.

Run 2 ecu's? (it's not unheard of)

romkasponka · « **Reply #143 on:** August 17, 2011, 08:08:53 AM »

What for two ECU when you can use MS3 and staged injection.

Boyracer · « **Reply #144 on:** August 19, 2011, 01:30:57 PM »

Megasquirt 2 can do semisequential in staged injection, good enough for me.

I have this add-on board:

http://www.jbperf.com/quad_ign_inj/index.html

Four independent ignition and four independent injection channels. On staged mode there is two banks of 2 injectors on both stages.

http://www.jbperf.com/sequential/index.html

romkasponka · « **Reply #145 on:** August 19, 2011, 02:09:44 PM »

Will it be possible to switch off completely injectors near cylinder head when others will start to squirt?

wazzu70 · « **Reply #146 on:** August 21, 2011, 11:02:24 AM »

Here is the VEMS diaglog box for injector staging.

Looks like no "blending" map to reduce pulsewidth of primary injector set while adding the secondaries. Secondaries just add a percentage flow at some TPS and MAP variable.

nuvolarossa · « **Reply #147 on:** August 22, 2011, 01:59:48 AM »

Quote from: romkasponka;106214

Will it be possible to switch off completely injectors near cylinder head when others will start to squirt?

Megasquirt3 + MS3X can do that.

Quote from: ms3 manual

Transition fully to secondaries - This setting is used to determine whether the fully staged state means that the primary and secondary pulse-widths are equal, OR if the fully staged state means that primaries are shut down completely and staging transitions fully to the secondary injectors. The following settings are possible:

Off - The fully staged state means that the primary and secondary injector pulse-widths are equal.
On - The fully staged state means that the primaries are shut down, and staging transitions fully to the secondary injectors.

screenshot of the settings:

MS3+MS3x is the bomb for its price (coupled with Phil Tobin's TS registered, best few bucks I ever spent for software, awesome support)

wazzu70 · « **Reply #148 on:** August 22, 2011, 12:33:00 PM »

Very cool. Both MS and VEMS seem to have come a long way in the last few years. TunerStudio and VemsTune are so much more user friendly.

fabe · « **Reply #149 on:** August 22, 2011, 08:41:05 PM »

Quote from: romkasponka;106144

Better atomization....

The attached article is good.. The tuner was generous in sharing his in-depth understanding and experience tuning dual bank fuel-injection.