alo

Basically would it improve throttle response or is it again another compromise

v man

think its to show people how much money you have lol

Maxwell

This!!

I dont understand, how putting TBs on a YB would be beneficial, as the YB was designed to run boost!

v man

i took it as he was talking about the inlets that use 1 throttle body per port

stevieturbo

Correct. ITB's are all about throttle response. But they will not make anymore power over a well designed single throttle engine.

zetec-Sam

iTrader: (2)

Wtf are you on? You can run both you know?!

alo

Good enough for me
Managed to get a set of weber alpha throttle bodies
Cheap.
Extra Throttle response on a laggy old gt35 would be a bonus i think

ozmk1cos

Sounds interesting

Grantcos

The pulsar has throttle bodies as standard, they seem to be sought after from people putting them on to other engines especially the LET

stevieturbo

Throttle response and lag are two very different things. ITB's arent suddenly going to make your turbocharger spool faster.

You may also need to switch your tuning to TPS vs RPM with MAP compensation now unless you can create a very stable map signal for using MAP as the primary load signal as it will become very erratic when taken from an ITB setup.
More of an issue at lower loads than WOT though.

alo

It wont spool faster but if the air coming from the turbo is closer to the inlet ports with a closed throttle than surly this will have some effect? Not massive but im sure driveability will be better than single throttle at the end of a pleneum?
I have just had anti lag installed so thats solved spool up

stevieturbo

Driveability will only improve if tuning is spot on. And driveability and throttle response are also two different things.

And given how small the volume of air is in the plenum and the quantities of air the engine consumes, the difference between ITB's and a single throttle really wont be that much.

If it's a track or drift car or somewhere you can be on/off the throttle a lot, or if using very large cams, the ITB's may be worth it. For most others I'd find it almost impossible to justify.

Karl

As Steve has allready said, throttle bodies on a turbo engine will give you more throttle response when you rev the car at idle for example, or when blipping the throttle during down changes etc, but it will make no difference at all to the turbo response, so when you change gear, you'll still be waiting for the turbo to re-spool exactly as it did with a single throttle.

Also again exactly as Steve has allready mentioned, a throttle body turbo setup cannot run soley as speed density. That means you cannot map your fuel requirement purely based on MAP V RPM. It requires significant throttle angle V rpm V map correction. My personal preference in this matter is using Pectel T6 with its multimap throttle angle correction maps.

Hope that helps,

alo

I'm not here to justify the reason for using them.
Just wanted to know the benifits.........
Wrc spec cars use them so they must be good??
But they are for a escort cosworth rally car
Producing around 500bhp.
either way they will be used now considering they are weber alpha throttle bodies and cost me less than a hart/as inlet.

Chip

iTrader: (3)

As Stevie says, very difficult to map correctly on a lot of ECU's

So in most cases they arent really worth the hassle given that the gains you get from them (slightly better response when you go from small throttle angle to big throttle angle whilst already in the boost threshold) are pretty small.

What ECU are you planning on using?

alo

On the current engine I am on p8 with btc pectel board.
Anti lag
Coil pack etc etc.
Pectel t2 is avalible if mapping on weber becomes an issue.

Chip

iTrader: (3)

I dont think T2 supports multimap like its T6 bigger brother does, so I think you might struggle to get it to work well on that.

So you might need to look at different management.

Drop Jimbo Gibbs a PM, he does a lot with T2 IIRC so might be able to offer a more definitive answer than my vague recollection!

stevieturbo

I didnt realise you building a WRC car, my bad.

And I clearly outlined the benefits, which are rather few. And the actual throttle system is if less importance than the actual intake/plenum design.