Ok guys, over the weekend I did the swap! And here are the results and review. The rest of my mods are in my sig, and I know some of the mods like Magnus V5 are a bit overkill for my current power level but then again I don´t feel the response of my car has suffered much if any, so I thought why not install a bigger throttle that mates a little better to the Magnus V5?

The install was straight forward and I oppened up (ported) the Magnus TB addapter plate to match the gasket of the S90 TB. Had to turn into the hulk to fit the silicone elbow up the neck of the S90 and after loosing a couple pounds in sweat it was acomplished... that was the hardest part of the install, but for anyone using the stock coupler it shouldn´t be that hard.

Driving impressions: After setting the TPS and idle rpm I went for the test drive, the response is a little improved and pedal feel is better, there is no additional jerkiness or lack of precision for power delivery. I have already driven in hard traffic and there are no problems whatsoever.

Attached is also a virtual dyno plot for comparison, this plot nicely shows what I feel in the butt dyno, no peak power gains but a little better response. The pulls where not made in the same stretch of road, but both roads are decently level and with few bumps, and the very silimar shape of the plots probably means the comparison is not that far off. I had more gas in the tank and my work back pack for the S90 pull, thats why there is a very little weight difference accounted for. Both pulls are with the same tune at 26 - 27 psi peak trailing to 19 - 20 psi by 7800 rpm.

All in all I´m happy with the results and the next step (in 1-2 months) will be a slightly ported head with S2 cams, hopefully to help me get closer to the 400 whp DJ numbers.

Cheers,

Ricardo

 

How is the quality of the S90 ? Fitment ? Seals ? MSRP?

 

Got mine from ebay for $165 Australian dollars plus shipping. Haven´t seen other popular brands throttle bodies first hand, so can´t compare S90 quality to others, but the S90 is very good quality.

Fitment with the Magnus is perfect, but I´ve read in other forum that fitment with OEM intake manifold is good but the intake´s inlet can´t be ported to fully match the S90 because there is not enough material, so aditional wall thickness has to be added (welded) if gasket matching to leave a good sealing surface. Other people just install it without touching anything in the OEM IM and it fits.


Can´t comment on the seals cause haven´t performed a boost leak test, but overall construction seems very solid. Oh, and in my case since the TB is flipped upside down it is much nicer to have the biss screw in an easy to reach location.

Hope this helps,

Ricardo

 

does it have double return springs?

 

I can see only one return spring.

 

Ricardo, How do you do with the tps sensor??? That s90 TB is for Evo 4-6???

Yo quiero comprar uno, pero del evo 8 el sensor es diferente y no queda.. Por ley tengo que comprar un TB especificamente para evo 4-6 verdad?

 

Hi Mauricio, yes it is Evo 4-6 specific and the TPS bolts right in. It does use different bolts than oEM for the sensor though, I think they are smaller. Don´t forget to adjust the TPS position while logging with Evoscan so that it reads 100% at WOT, I forgot that and the car iddled like crap ´cause it was like 12% off.

 

Hi Ricardo,

I think the Magnus manifold won't be helping you at your level of tune. I think you would be better off with a ported OEM type manifold and would achieve better results low down and midrange with a ported stock type as well as better spool.

The position of the brake master cylinder assembly on a LHD V RS look like a pain in the ***!

Here's my setup in my V RS - MAP rev2 manifold and the s90 throttle body.

 

Can´t see the pic... Can you send your set up to my email??? I will apreciatte!

mauricio_grande@hotmail.com

Thanx!

 

and how is idle motor installation?

 

Hi Karl,

Yeah, I´m sure my car would be snappier with a setup like yours with the Map rev2 manifold. But I really don´t feel my car is slow to respond, compared at least to other Evo´s here. I´ve preloaded the WG arm quite a bit and that helps a ton with spool up. I use the car in Autox and drag racing, so with the Magnus I was being a bit more biased for the 1/4 mile. I´m currently refreshing the engine with new bearings, ported head, and manley rods; the stock rods have taken more than enough of a beating. Before the year´s end I will be putting a MAP EF3 turbo as well!

Your car is gorgeous! How is the rebuild coming along?


4ukc, the idle valve and motor bolt right up to the S90.

 

Hi Ricardo - That makes sense if you use your car for the 1/4 and are fitting a larger turbo too.

Thanks for the kind words and interest in my car. The rebuild is coming along nicely thank you - I should have an update soon as well as a few cheeky mods too - why not hey?!

Good luck with the engine refresh

Karl

 

Hllo Ricardo.. I have a problem...

I get the S90 70mm throttle body, and my Intake Manifold is open to 65mm. In my country nobody want to mande the work to open the throttle to 70mm... What do you think Ricardo or somebody here in evom, if that will affect the performance of my car??

 

Hi Mauricio, I´m no expert but think the optimum would be for your intake manifold to open to the 70mm and have a smooth transition with the S90. But, if you are already at 65mm in the manifold you are already halfway, so it should still be an improvement with the S90 as I think the initial tests were done with a stock intake manifold with more mismatch than what you are going to have, and they still showed gains.

I can not speak first hand on the above though as I never did the S90 with stock intake manifold as I already had the Magnus. You can always go back to your 65mm throtle if the S90 shows loses.

Good luck,

Ricardo

 

Ok gracias Ricardo!

Ayer lo envié a un taller y se abrirá a lo que mide el empaque que trar el S90 que es como de 69mm. Algo así quedará y le haremos una forma como cónica despues para que el aire agarre velocidad... creo que con esto no chocará el aire y aunque sea que quede igual o gane top end estoy felíz. gracias Ricardo!