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

[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.

[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.

[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

[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.

[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.

Sent from my SAMSUNG-SGH-I337 using Tapatalk

[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.

[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]

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?).

[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.

[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?

Sent from my SAMSUNG-SGH-I337 using Tapatalk

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

[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

[ForcedFirebird]

jenvey thought i should use 48 on my M20, what nonsense on anything that you want a good VE in the midrange from rather than a dyno queen.
you can make 500bhp with 50mm ones. sizing based on hp/cyl is a good guide as it gives velocity so 45's are good for 400bhp this gives plenty margin for M50/52 based engines.

ive chosen 42mm for my next build but not jenveys, couldn't be bothered figuring out linkage etc

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.

S54 is 42.5mm if you want a comparison.

It's huge as its 42.5mm x 6

Euro s50b32 wont be much different; anything above 36mm would be adequate for a s52 NA.

A supra mk4 has a 60 mm throttle; it's ok for a 600rwhp. Cut that in half for a NA application and multiply by 6.

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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.

EDIT: Single 65mm-75mm feeds LSx just fine.

[Wanganstyle]

Your head is up your ass again wangan.

You can't compare a single throttle body size to ITB. Only 1 cylinder pulls air at a time so an individual cylinder with it's own butterfly needs to be much larger than splitting a single TB six ways.

A S52 on 36mm ITB would be very choked.



Nice work FF, can't wait to see the results.

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?

I don't modify engines; I run stock oem engines.

Sent from my SAMSUNG-SGH-I337 using Tapatalk

[LJ851]

S54 is 42.5mm if you want a comparison.

It's huge as its 42.5mm x 6

Euro s50b32 wont be much different; anything above 36mm would be adequate for a s52 NA.

A supra mk4 has a 60 mm throttle; it's ok for a 600rwhp. Cut that in half for a NA application and multiply by 6.

Sent from my SAMSUNG-SGH-I337 using Tapatalk

Your head is up your ass again wangan.

You can't compare a single throttle body size to ITB. Only 1 cylinder pulls air at a time so an individual cylinder with it's own butterfly needs to be much larger than splitting a single TB six ways.

A S52 on 36mm ITB would be very choked.



Nice work FF, can't wait to see the results.

[NickL]

Excited to see results and what you guys have to offer for tuning. Ill be extremely interested to run these on my S52.