You can the SR20 off the ECu with about 6 wires including the alternator and fuel pump. Hard to think of a reason to mess with that simplicity. Bike carbs or ITB's would actually be more complex and wont run as well.
You can the SR20 off the ECu with about 6 wires including the alternator and fuel pump. Hard to think of a reason to mess with that simplicity. Bike carbs or ITB's would actually be more complex and wont run as well.
An issue with many CV bike carbs is accel mixture enrichment. The heavier the vehicle, the more of an issue it becomes. Bikes get away with it because they are so light, and most CV carbs will provide the minimal accel enrichment needed when snapped open. But on cars, CV bike carbs can bog, requiring you to 'roll on' the throttle instead of stomping it.
I used ITBs from a triumph tt600 on my challenge tercel. It was kinda easy to do, I got it running on the stock ecu first then I switched to megasquirt. runs great using Alpha-N.
ITB's look so pretty and sound so fantastic. If only standalone didn't scare the E36M3 out of me.
In reply to clshore:
Do individual carbs even need acceleration enrichment? They only flow air for a split second at a time anyway.
The Keihin FCR flat slide carbs on my Datsun has an accelerator pump circuit on the carbs. Like everything else with the these it's highly adjustable. It does make a difference.
I'm not one for advocating carbs over FI but the big deal on flat slide carbs is there is no throttle shaft obstructing the flow, hence they flow more. I'm all for ITBs but I want the slide valve kind. I think BMW ran them back in the day. Many racing organizations do not allow slide valve throttle (specifying butterfly style).
In reply to snailmont5oh:
I'm no carb guru, but I'd think even more so! Flowing lots more air in a split second=a need for a lot more fuel delivery in the same split second to keep the mixture appropriate.
ae86andkp61 wrote: In reply to snailmont5oh: I'm no carb guru, but I'd think even more so! Flowing lots more air in a split second=a need for a lot more fuel delivery in the same split second to keep the mixture appropriate.
Based on my experiences with tuning ITBs in MegaSquirt, you would be correct. They need a huge amount of fuel at tip-in or during large throttle changes. The fact that they have such small amounts of vacuum available at those moments makes things a bit more tricky at times.
Needless to say, they aren't known for their fuel mileage :)
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