I remember Noah of AAC was trying to get a set of ITBs made by Jenvey.
iracemine's purpose built N/A ST2 thread
- Thread starter iracemine
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I remember Noah of AAC was trying to get a set of ITBs made by Jenvey.
Shouldn't be too difficult: cut an aluminum flange to the specs of the stock IM-to-head flange, find two DCOE or IDA-style aluminum flanges, determine desired length of runners and weld aluminum tube between them, and ta-da, ITB intake manifold. DCOE and IDA-style throttle bodies can be obtained from Jenvey, Borla, EFI Hardware, etc.
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I was gonna hit up AAC and see where they left off. I'm sure I got a ton of hours of inter web searches in front of me, But again I would love to slap on a miata piece and call it a day.
I was gonna hit up AAC and see where they left off. I'm sure I got a ton of hours of inter web searches in front of me, But again I would love to slap on a miata piece and call it a day.
Borla Inducation makes 1.8L Miata-specific kits with the ITBs, linkages, TPS, and manifold but they're ~$1700. Even then you'd have to make an adaptor to go from the FSDE head to the Miata flange on the intake manifold for the ITBs. You'd be better off just getting the ITBs and doing a custom intake manifold. EFI Hardware sells ITB kits with everything you need except the manifold.
I think the past of least resistance is to modify a mx5 one with a different mount. I would like to just get one where most of the stuff would bolt up. I will look into adaptronic and see what they need and if I could get rid of some more stock ecu stuff while I am at it. Since the adaptronic will be controlling the idle now?
How did the .050 Pistons work out??? I was under the impression we couldn't go out that far for fear of overheating and or destroying the engine
iracemine, I'm getting an adapter plate made for black top throttles. I can ask about getting two made?
4 * 48mm OD throttles. They have Idle control valve and have a stable map port
Sorry about not posting maths
Yeah sure let me know. I need to make a couple payments on the CC and then I will try and get ITBs running before it gets too cold up here. I'll look up black top, I like the idle control idea.
.050mm or aka .020inch for you domestic loving types. It's the 83.5mm piston, weisco also makes a 83.00, 83.25, and a 84mm piston. Its also a iron block, so don't lean it out and you will be fine..... that is unless your making like 800hp then I have no idea.
iracemine, I'm getting an adapter plate made for black top throttles. I can ask about getting two made?
4 * 48mm OD throttles. They have Idle control valve and have a stable map port
Sorry about not posting maths
Interesting I didn't see this last night because I was searching around and questioning on it. So you have checked it all out to see that multiple smaller TBs will infact run without dropping the velocity of intake harming the power creation?
Our cams (stage 3) create such velocity with the stock mani that it is making cavitation that it is rendering the MAP sensor useless and any smooth stream of induction impossible above 6k rpm, and at all with the 626 mani. If either or any protege was with stock cams this would indeed kill any velocity and hopes of capturing good scavenging.
I'm not really sure what you're trying to say here. Cavitation is the formation of gases within a liquid due to forces applied to the liquid. The term is mostly applied to marine propellers...
Anyway, you're going to be hard-pressed to get good MAP readings with any intake when using big lift/duration/overlap cams. The ITBs will help get more air into the engine as demanded by the cams but they're likely going to make your MAP readings even worse. Your car is really just screaming for a properly-matched intake manifold (be it with ITBs or not). Borla advertises "vacuum accumulators" to help damp intake pulses for better MAP readings and other vacuum-operated devices (e.g. brake booster). All this appears to be is is a tube transversing all the intake runners to accumulate vaccum from each. I would think this would have a negative effect on resonance tuning.
my vocabulary is terrible, so cavitation is not the right word then.
I think there still is individual vacuum ports on each runner. All I need are the vacuum for the pressure reg, gass evap, and engine managment. I do not have a brake booster anymore. I had to order the mx-5 intake gasket. I will check tomorrow to see if the intake ports are spaced the same. If so then I can use any miata 2.0 ITB's manifold, and modify the bolt holes drilling.
If not....... I may still look into the 505 intake or Ice88's ITB's
I think there still is individual vacuum ports on each runner. All I need are the vacuum for the pressure reg, gass evap, and engine managment. I do not have a brake booster anymore. I had to order the mx-5 intake gasket. I will check tomorrow to see if the intake ports are spaced the same. If so then I can use any miata 2.0 ITB's manifold, and modify the bolt holes drilling.
If not....... I may still look into the 505 intake or Ice88's ITB's
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- 2003 mazdaspeed protege
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OK before I lay out 5k on ITB's I am going to try the 505 intake manifold. The runners are shorter than stock, MUCH shorter than the 626, but the angularity of the piece sucks, But I will like that I dont have to buy anything else and I can still use the ICV and my microtech.
Time to penny pinch and sell some crap and I can post up some dyno results for a N/A with a 505.
Time to penny pinch and sell some crap and I can post up some dyno results for a N/A with a 505.
Do you need the short runners or just the increased airflow? Really short runners with aggressive cams is going to make for a steep power curve with the peak at high engine speed. Or are you trying to tune for a specific resonance? I also wouldn't necessarily say the angular is a bad thing. If I recall correctly there was some design optimization performed. The neat thing with ITBs is you can play with different length horns and spacers to quickly change intake length and adjust the location of peak power.
