Anyone ever used Stack Injection ITB setup?

Eric B

Eric
Eric, I'm about 40 minutes South of Dennis' shop.
My car is up there now. Dennis and his crew are a great bunch.

The base tune in the ECU was not giving us results down low, so we are using a "prestigious" local tuner to review the ECU and the tune. The engine (built at Craft Motorsports) came with a basic ECU, depending on what the tuner says I might upgrade that ECU so I have more options once I take delivery of the car.

E
 

Chris

Supporter
I was speaking to a tuner regarding using something like an Omex 710 and he said he would just tune it on TPS and crank sensor as if I went with Jenveys it’s unlikely they’ll have common plenums in the manifold etc. Naturally I understand that the vacuum signal is low at idle etc but wouldn’t it be a better tune with a Map, TPS and atmospheric/temperature sensor?

Now obviously the borla etc setups use MAP and TPS, then you have got your add ons like cam sensor and O2 sensors in the exhaust collectors etc. Will be using a wasted spark setup for the ignition.

It’s going to be similar money for borla/Jim inglese and the Jenveys so if you all had a choice which would you choose and why? Obviously a UK company for support is always a massive pro point but it seems that it’s a much more basic setup than the other two. . . . However as I’m not utilising sequential ignition etc would you think that it being more basic wouldn’t be a problem.

So basically if you were to buy a set of ITBs now, what would you buy and what sensors would you run?
 
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what would you buy and what sensors would you run?
o2 sensor
Crank position sensor, even if you are going to run a stock dizzy.
Map sensor
TPS
Air temperature sensor.
Cooland temperature sender. ( very handy for cold start enrichment settings )

I have Megasquirt controling the injectors and ignition, still running a stock dizzy, distribution the spark to the plugs (single coil with IGTB) but igntion is fully controled by Megasquirt which gets its signal by a 36-1 crank trigger. Crank trigger is way more accurate.
You can not live without an 02 sensor, you need to see whats going on, even on carbs.
MAP gives you the ability to alter fuel & igniion settings under load
You can let MAP & TPS work together in % MAP DOT or % TPS DOT

Most ECU's start in closed loop thats where the o2 sensor plays a big role, fully warmed up they go to open loop, but I always like a % o2 influence.

My 50cents, carbs or injection, same top horsepower. Carbs, no hassle once set up correctly and synchronised each year.
Injection gives you the ability to get better fuel control under any condition but thats not a matter of just setting it up on the rollers within a few hours. and 8 stacks needs to be synchronised also each year.
Carbs or injection, doesn't make much on fuel consumption also.
I have spent hours in weeks, months with the laptop in the car to fine tune my ECU settings during driving conditions and I am still not satisfiet.

Injection is fancy but doesn´t ad.
Carbs allways work. no sensors to fail, no heat soak injector issues leaving you stranded for an hour to cool off after a fuel stop., carbs just a tap on the throttle to give fuel to fire up the engine.
 
I was speaking to a tuner regarding using something like an Omex 710 and he said he would just tune it on TPS and crank sensor as if I went with Jenveys it’s unlikely they’ll have common plenums in the manifold etc. Naturally I understand that the vacuum signal is low at idle etc but wouldn’t it be a better tune with a Map, TPS and atmospheric/temperature sensor?
Hi Chris,

If you IR system doesn't have a common plenum - make one. Tap each runner under the throttle plates, and run 8 small vacuum lines to a small vacuum reservoir, then feed the MAP sensor off that. Unless you have a truly massive cam - I'm talking a mega race cam - there's no excuse for not running a well tuned speed density set-up.

Cheers, Andrew
 
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