Hi dudes,

On your big power cars, who has gone over to a 500 ( either rep or original- or indeed a larger aftermarket) throttle body?

Just wondering at what point one would upgrade from the original, and what benefits / downsides there are?

Thanks

Weeksy

 

All depends what power your after and what spec inlet plenum your running

A hart plenum can do 600 hp with a std tb for example and 500 can be achieved on a std 4x4 inlet plenum with a spacer..

I ran a 500 spec hart plenum and 500 tb just so my inlet and outlet was the same on my intercooler for example and that did 642 hp at its best but it may have done that with a std tb??


cheers danny

 

You dont need a bigger throttle body untill your at stupid figures so stick with what you have weeksy.

 

This is with Hart plenum and std throttle body @ wheels

 

Awesome power!!!!

You must have a good spec head and cams on that!!!

lol


cheers danny

 

Hehe Yes i think so danny

 

I have a nms touring car spec head with a paid of 15's, a t4, and hart plenum.

I wondered about the tb as I need to pull the intercooler off it to get one of the spouts tweaked, so thought of replacing both with 75mm spouts and doing the throtle
Body at the same time. Mental power on the original throttle body fella. That must have been running some boost to make that, a little more than my t4 could muster I reckon!

Appreciate your comments fellas.

Thanks

Weeksy

 

That looks a decent curve there. What's the spec?

Jim

 

sorry to hijack your thread mate but i've brought a st escos inlet for my 2wd. What tb should i run with that. Power will be only be 400-450?

 

Think you know the spec Jim. I have told you that before on PM It was on 2.3bar of boost and E85 fuel

 

The head is a niel roper big port big valve head with solid lifters and custom cams..

Long duration high lift inlet,shorter duration high lift ex with some fruity cam timing!!

Gt 35,hart inlet etc etc..Good power!!


cheers danny

 

ST escos as the shape is different - not sure if you can an aftermarket one to fit but they are different shape to 2 & 4x4 TB's

 

I think you can get a 500 tb on them but as said not needed or cost effective so you really need an st one mate


cheers danny

 

bugger there well pricey! Think due to their rareity??can i get a spacer for my 2wd inlet and use my 2wd tb but it get it machined for better flow and anti lagg? Or i could just sell the st escos inlet...

 

just sell the st inlet as they go for good money and then get a spaced out 4x4 inlet or even just a std one at 400 ish hp will be fine..


cheers danny

 

but dan the st escos one flows much more air

 

But your only looking for 400-450 hp and dont wanna spend the cash on a st tb??

Iv had over 500 hp on a 4x4 plenum with a small spacer??

If your worried about flow then you would buy a hart plenum or similar??

Its what ever you can afford mate


cheers danny

 

I was under the impression the ST inlet had an odd stud pattern unless the 500 TB has the same but again i thought that was different as this was mentioned when members on here were moving from ST inlet to Hart

 

The st t/body dose bolt on different as I had to order my hart inlet with an st flange

 

Are there any special requirements to wire in the ISCV and TPS please as I have a ST inlet and TB and was wondering about the wiring - soz for the hijack of op.

 

to be honest I don't no mate as it was fitted by m.a.d when I had my sm4 ecu fitted so they did the loom as well

 

if you go too big on the TB compared to how much air you need at the max in theory you will lose resolution down at the bottom end making it more difficult to get the mapping right at small throttle openings.

bigger is not always better. get the right size for what the engine needs.

 

Thanks for the info dudes

Weeksy

 

400-450 and i've already brought the st inlet

 

whats all this about Small turbo plenums being different bolt patterns?! just drill out the holes in the throttle body to 8mm job jobbed. i believe 4x4 tbs may need a touch grinding off somewhere as the iscv fouls the manifold slightly but i can confirm the 2wd throttle body fits and works perfectly, flows plenty of air for 500+ bhp.
you will gain throttle response with a larger throttle body but as said it will be harder to map as you lose low end resolution.

 

That is the reason most throttle bodies of the correct design have non-linear opening as the throttle is operated.
Nothing wrong with the correct throttle body like the RS500 type.

Steve

 

So i can use my standard 2wd tb with my new st escos inlet! Sounds good to me as max power will only be 450.

I seen a company on ebay that gas flows your tb and also modifys it for anti lagg

 

I'm sore the flange is different as I have an st t/body and when I ordered my hart inlet I had to order it with a rs500 flange so I guess that's different too a 2wd one

 

as J1mbo says i dont think you need a tb any bigger than standard unless your over 700hp i used the standard one on my car and saw 650hp

 

U fancy selling your st tb mate?

 

I cant mate its on the car! It was fitted at m.a.d when i went 500bhp as he said to use a st inlet! i almost swaped to a 2wd one after the trouble i had with it when i fitted a hart inlet but mark said it would be better to stick with the st t/body which is funny as every one on this thread says you dont need a bigger one i guess it deponds on whos opinion you value id go with the tunner i use personally not that im saying its better just i was told to stick with it

 

STD throttle body it is then!

Thanks fellas, much appreciated.

Weeksy

 

Same as the Moaning ones advice from Turbosystems

Steve

 

Now Big Tone loves a ST throttle body doesnt he?!

 

weeksy you already had my expert opinion on the merits of larger throttle bodies
mapping is not an issue for people that can actually map

 

What the hell does Tony & Mark Shead know about Cossie tuneing .
Im with the all knowing lads on PF thats where the knowledge is .

 

TPS will be the same (PF09), ISCV is different, you'll need the original plug for the small turbo throttle body