High IATS with ITBs

[Edgeauto]

I was wondering what other people with ITBs have done to reduce IATs and has it had a good result? ATM we have wraped our exhaust, put a plate under the ITBs and fitted a duct but IAT still reaches up to 75 DregeesC when stopped at lights during the day. Also has anyone fitted a Hondata heatshield gasket and does it actually give good results?

[ProECU]

There have been a few good independant tests of the Honda$a intake gasket, with good results. If its cheap enough grab one.

The other thing to consider is to make a cover for the ITB's similar to the TWM style.

Personally, i've never been sold on ITB's. It would be interesting to do some back to back tuning tests of ITB's vs Manifolds.
They do sound nice though.

[Edgeauto]

We started to make a box but could be bothered finishing it but we may have too:(

[barefootbonzai]

i'm running the hondata intake gasket. very hard to say if it make any difference with ITB's. when i was running just an intake manifold, i would say yes it made a difference.

As for lowering the temp... i'm like you was gonna build a box but just got too lazy. i reckon an easy way would to get a bonnet scope, but i just don't want one cause it's ugly, lol.

[Edgeauto]

Personally, i've never been sold on ITB's. It would be interesting to do some back to back tuning tests of ITB's vs Manifolds.
They do sound nice though.

Yeh they do sound tough, if you could keep IAT down i think they would produce better results. It definatley would be interesting to test but unfortunately we chopped our manifold to make the ITBs. bfb may have a before and after dyno result.

[muhhan]

From what I've seen of cars with ITB, many have an enclosed box around the ITB with ducting running from the front of the car to the box. Didn't the Top Secret VQ35DE Skyline have a very intricate ITB setup where they did a lot of extra plumping to try and get as much cool air to the ITBs as possible?

I've also read that the manifolds design can take advantage of the helmholtz (spelling?) effect which is supposed to aid in the filling of the cylinders. I haven't done detailed research into it as there's probably sweet nothing I can do to improve on it (there's probably a good reason why the guys who design this stuff spend 5+ years of their life studying it).

I have to admit though, ITBs look damn sweet and tough as!

[TODA AU]

I was wondering what other people with ITBs have done to reduce IATs and has it had a good result? ATM we have wraped our exhaust, put a plate under the ITBs and fitted a duct but IAT still reaches up to 75 DregeesC when stopped at lights during the day. Also has anyone fitted a Hondata heatshield gasket and does it actually give good results?

What are your intake temps from 60km/hr & over?
Do they reduce significantly?


If you do make a sealed box for the intake, make the volume as large as possible so as not to lose any of the affect of the quads.

FWIW: @ 75deg intake air temp, you're losing approx 10~11hp (8kw) over what you'd have if the intake temps were 30deg C.
If you can get the temps down you'll pick up some free power & be less prone to detonation.Cheers

Adrian

[Edgeauto]

General cruising on a 30deg day IAT is about 55deg. Yeh we got upto 5deg ignition retart:( At least we can still keep up WRX even untuned . Re-looking at our design we have discovered that the IAT sensor may be picking up the temp of the manifold also so some modification may be in order

[TODA AU]

General cruising on a 30deg day IAT is about 55deg. Yeh we got upto 5deg ignition retart At least we can still keep up WRX even untuned . Re-looking at our design we have discovered that the IAT sensor may be picking up the temp of the manifold also so some modification may be in order

A general rule of thumb with tuning is:
More efficient intake = less total advance
More efficient exhaust = less total advance & visa versa.
As your intake is more efficient than stock, even with perfect intake temps,
You’d still run less total advance than with a normal plenum.
So, don't worry too much about how much your ignition may appear to be retarded.

Check that the sensor is actually reading air temp, not manifold temp.
If it is correct, you still need to lose an extra 25deg on a 30deg day to find an extra 5~6hp.
& have the thing tuned…
Then you’ll beat that WRX rather than just keep up with it.
Cheers

Adrian

[Edgeauto]

A general rule of thumb with tuning is:
More efficient intake = less total advance
More efficient exhaust = less total advance & visa versa.
As your intake is more efficient than stock, even with perfect intake temps,
You’d still run less total advance than with a normal plenum.
So, don't worry too much about how much your ignition may appear to be retarded.

Check that the sensor is actually reading air temp, not manifold temp.
If it is correct, you still need to lose an extra 25deg on a 30deg day to find an extra 5~6hp.
& have the thing tuned…
Then you’ll beat that WRX rather than just keep up with it.
Cheers

Adrian

Got dyno time booked for this weekend:) Once the gearbox is back in we plan to test air temp compared to what the sensor is reading.Thx for the input:thumbsup:

[EfiOz]

A couple of tips on airbox design.

1. Try and keep the total volume above 3-4 times the engine swept volume i.e. 2L engine at least 6-8 litres of airbox volume.

2. Make sure the inlet trumpets have at least half the diameter of the bell mouth in clearance to the airbox.

3. Inlet pipe should be at least 75mm (preferrably 100mm).

[Edgeauto]

OK today we had a spare IAT sensor lying around so ghetto fitted it to the front of the stacks and went for a drive, IATs read between 45degC and 55degC. when we got back @idle with the bonnet up it read 45degC so we plugged the 1 thats in the ITBs back in and that was reading 75degC:eek: So clearly its picking up some of the manfifold temp up. thanks to all that gave some advice.:thumbsup:

[EfiOz]

What was the ambient temp in Adelaide today?

[Edgeauto]

mid 30s. IATs are still a little high but better than 75degC

[b20b]

i had a carbon fibre air box on my quads got it from efi hardwear melbourne...they have fibre glass ones as well...i had 100mm pipe to this and the air filter in the front guard

you have to add fixings your self to hold the lid on and i added rubber edging to seal it better and rubber gasket to seal it to the quads...so still a bit of work to be done......

Looked good once i finished it but it was a bit of messing around

[EfiOz]

We're doing a F3 looking airbox that seals right around to the manifold flange.

I want to make one that can handle some boost too!!

[Edgeauto]

I guess we could always get the Toyota one and see if we could fit it pointing backwards but it seems to small to me.

[Edgeauto]

Boost would be fun but a pain to tune since you couldn't run TPS maps.

[ProECU]

Why, its no different to the current alpha-n ITB code, just more columns for higher pressures.

[EfiOz]

Yeah, you just run TPS with a map compensation. It's fantastic for throttle response.

[pornstar]

Because not all ecus are that good pat :)

[tinkerbell]

my before and after install of a Hondata "style" phenolic gasket showed temperature reductions of around 10-30 degrees.

the car gets to about 40 degrees in stop/start driving compared to over 65 pre-gasket

the intake manifold heats rapidly once the engine is switched off with the bonnet closed,

once cruising it can drop more quickly too, but once it is up over 30, only freeway driving in cool temps can get it back below 30

this is using the Power FC IAT sensor readings...

yes - a phenolic gasket works well, and works better if you use phenolic bolt washers.

however - bonnet venting and active intake cooling will further help reduce IM temps and hence improve power.