Drag and Drive Baja

[Schweg]

Um... is this a competition!?

It’s around 45-50mm just under 2”.

It came off of a 1.7L Hyundai Scoupe


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[buguy]

Not at all! Mine is 50mm and I noticed I can make nearly 30 psi of boost at 50%-60% tps. In fact I bet if I held it steady it would make it at even lower TPS. Wondered if id be better off with something a little smaller. Maybe I would have better drivability.

[Schweg]

I had some conversations about it. I don’t think it’s a huge influence at close to pipe diameter. Though I think we are sized to flow more but our cams and heads won’t allow it.


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[buguy]

Maybe not. I cruise at 2800 rpm or so at around 16-17% that seems normal enough. But I almost feel like mine is faster at 50%-75% throttle than it is at 100%. I was thinking maybe it created better air speed. Or maybe I'm just nuts! I guess I could test it on the dyno this weekend.

[Schweg]

Are you sure that your not over rotating and closing again


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[buguy]

Yeah I'm sure

[Schweg]

Maybe the restriction slows boost to build faster then without making power build more rapidly.

I thought Kalle got a boost from dual throttle bodies be one centralized one


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[buguy]

I believe he said he made 50 more hp with the duals.

[Schweg]

I seem to remember that as well, that may have been some of it. I need to re read that thread again.


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[buguy]

But that's a HUGE turbo, big intake volume, big exhaust, and plenty of rpm.

[Schweg]

Yeah I have one in the garage. Just need to build up
To it. That or look into a compound set up.


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[buguy]

Nitrous!

[Schweg]

Wanted to post a few videos, this is what I was trying to explain earlier that my AFR is fluctuating but also I am getting some voltage change as well any thoughts on what is happening would be great.

AFR Gauge Fluctuation

Thats just a 2nd to 3rd gear roll on. Was trying to capture all the gauges and some of the speed. Need to figure out a different camera mount and not holding it.

2nd to 3rd Gear

[buguy]

I don't know what's going on but that's awesome!
On mine I added some accelerator pump action. Mine also isn't rock solid so I'm definitely not the one to give tuning advice

[buguy]

Is that top number your afr target?