ITB's on a 24v project, Dyno results Post 136!!!

[Wanganstyle]

They like to over-size them. I wanted drivability as well. Jenvey linkage is all modular, so it was a matter of going through parts and seeing what fit, finding a throttle cable setup that matched the chassis, then it was a matter of the peripherals. Making this a bolt on took a lot of trial and error.



Area or flow doesn't work like that. A single 45mm throttle will flow ~210-ish CFM a single 65mm will flow ~440-ish. Even though the single throttle is sharing the flow, reversion and pulsing has to be taken into consideration.

Does one 3200cc/6 cylinder paired with one 36mm throttle max out the single throttle?

If they are open to atmosphere it would have no impact for accumulator pulses

[LJ851]

Have you tried it?

How can one cylinder alone pull more than 36mm worth of throttle?

Prove to me why my your nose is up Paul burkes ass?

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Spend some time on a dyno, you'll figure it out.

[Wanganstyle]

Spend some time on a dyno, you'll figure it out.

I have no need to dyno tuner game any engines; I only dyno post race to see if the oem engine/oem computer are making reasonable power.

I actually race and am faced with the realities of racing (and having spares) instead of building dyno talk engines.

[ForcedFirebird]

I have no need to dyno tuner game any engines; I only dyno post race to see if the oem engine/oem computer are making reasonable power.

I like using dynos to read real-time data, and it's better than tweaking maps on the street.

Sucks to be impounded for too much power (or maybe not?).

[LJ851]

I have no need to dyno tuner game any engines; I only dyno post race to see if the oem engine/oem computer are making reasonable power.

I actually race and am faced with the realities of racing (and having spares) instead of building dyno talk engines.

Then why talk out your ass about ITB sizing when clearly the realities of actually racing have used up the majority of your brain cells ?

[ForcedFirebird]

Does one 3200cc/6 cylinder paired with one 36mm throttle max out the single throttle?

Yes. Put a 36mm restrictor plate on that throttle. Bumping down a class by detuning will have the same result.

If they are open to atmosphere it would have no impact for accumulator pulses

Right, but they now deal with reversion in a much better way.

[Wanganstyle]

Then why talk out your ass about ITB sizing when clearly the realities of actually racing have used up the majority of your brain cells ?

Because I'm drinking beers and this is r3vtard.com?

I assembled a triple over head cam engine and ran it to 9250 rpm and made 238awhp, I have the dyno chart on the highline dyno to prove it.

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[LJ851]

because i'm drinking beers and this is r3vtard.com?

I assembled a triple over head cam engine and ran it to 9250 rpm and made 238awhp, i have the dyno chart on the highline dyno to prove it.

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Yes. Carry on with your evening.

[digger]

S50 and S54 are 50mm guys hence there are few race engines with 450-500bhp without resorting to anything larger, S38B36 45mm IIRC

dinan overbore S54 units from 50 to 51.5mm but all but few professionally build engines actually would benefit to any meaningful amount

http://www.jenvey.co.uk/jenvey/throttle-body-selection-with-jenvey-dynamics

[ForcedFirebird]

S50 and S54 are 50mm guys hence there are few race engines with 450-500bhp without resorting to anything larger, S38B36 45mm IIRC

dinan overbore S54 units from 50 to 51.5mm but all but few professionally build engines actually would benefit to any meaningful amount

S54 is 42.5mm if you want a comparison.

Either way, 45mm will serve a wide range of engines.

[MyE30]

I like using dynos to read real-time data, and it's better than tweaking maps on the street.

Sucks to be impounded for too much power (or maybe not?).

in my experience, unless your using a wideband in the collector at the end of your header then your readings will be delayed if you are using the dyno's wideband shoved in at the end of the tailpipe. additionally, road tuning on the street/track using datalogs gives a more accurate picture of load put on the motor vs the normally 500 lb wheel on a mustang dyno or hydraulic load from a dyno jet.

obviously, tuning with the dyno will get your A/F to a point where you will not be running too lean or too rich on track and is needed to get the timing advance where it needs to be for usable power. however, IMO there are some benefits to be hand to dialing in the motor, A/F wise, with road tuning.

just my 2 cents.

[digger]

Either way, 45mm will serve a wide range of engines.

yes, make them smaller and the modded guys will complain

[jrockbk]

Def subscribed looking forward to see e30 Swap setup! Love how you guys argue over the numbers too it's funny

[ForcedFirebird]

in my experience, unless your using a wideband in the collector at the end of your header then your readings will be delayed if you are using the dyno's wideband shoved in at the end of the tailpipe. additionally, road tuning on the street/track using datalogs gives a more accurate picture of load put on the motor vs the normally 500 lb wheel on a mustang dyno or hydraulic load from a dyno jet.

obviously, tuning with the dyno will get your A/F to a point where you will not be running too lean or too rich on track and is needed to get the timing advance where it needs to be for usable power. however, IMO there are some benefits to be hand to dialing in the motor, A/F wise, with road tuning.

just my 2 cents.

Understand completely. We use the road, track, flow bench, engine sims, dyno and even driver feedback. No sense in wasting time on a dyno to get a vehicle moving, no sense in tracking something that will blow up getting logs etc.

EDIT: Typically tune with a local WB, not the dyno tailpipe unit. Have with the tailpipe ones, just takes longer since the RPM based AFR is laggy and inaccurate.

[The Dark Side of Will]

Have the whole thing bolted back on the car. Idles like a rock, but off idle and stabbing throttle bogs pretty bad. Was hoping to go to the dyno tomorrow, but will need to re-write all the maps to add fuel sooner. Rolling on the throttle, or once the fueling catches up, this thing is a rocket.

Are you seeing a rich spike or a lean spike?