I have an STI 5 Type R (280HP) and would like to know what turbo the car has. Also, what is the HP rating of this turbo.

I am now seriously considering a Possumlink but have no info as to how much the Std car can be tuned up. Also, the standard ECU mapping does 1.1 bar. Can the car handle more boost and will this give more HP? I can get access to 98-100 octane here.

Lastly, is the automatic intercooler waterspray ECU controlled? If not, what determines when the spray occurs?

Anyone with experience on this car would be appreciated.

 

Hi there,

I'm not sure on the V... Havent studied one yet.

On the IV, the turbo will cope with upto and around 350BHP (1.2-1.3) bar. On this model its the VF-23. Anything after that and the turbo is struggling and running hot!!

The possum link for the V has only just come out. I know there was a problem with the fuel injection, which as only just been resolved (a few weeks back).

If the V is like previous STi, then the conrods and conrod bolts will be the weakness.

Changing (upgrading) the turbo to give more top-end will alter the bottom end, make it less responsive (more lag).

You need to decide what you want from the car, and what your budget/how far you want to go in modifying it is ?

The car is designed to run on high octane fuel (not our crappy 98RON stuff).

J.

ps - Increasing boost will increase power - But only if the fuelling is adjusted accordingly (to compensate), and you dont experience pinking.



[This message has been edited by firefox (edited 29-09-1999).]

 

1.4 bar comfortably.

Comments "Do You Need This" or would you say 1.7 bar ?

 

In general IHI rollerbearing Turbocharger would be able to handle 1.4Bar and producing 350bhp... inside information.

As for ECU .. MOTEC M48-Pro is the way to go. Expencive but worth it. Get in touch with Mr. Fraser from Motec Europe. U can always re-used the ECU for Ur next car or Plane.

Malique - 1.7Bar ..hmmm let see if Ur conrod bolts would last .. not to worry .. I do have ARP bolts to replace Ur's.

Anyway .. STI conrod are STRONG .. only the conrod bolts are weak..... the strongest is Subaru Legacy RS conrod.... polish&shotpeened .. become GRP A stuff .. easy eh.

More money ... buy Saenz Conrod.

Cheers.

 

Hi guys.. (malique and DYNT)

It was waiting for you two to comment... lol

1.4 out of the VF-23... thats pushing it..

personally I would fit the vf-22..

Like I said.. I'm not sure about STi V's.. but with IV's anything above 1.4 would require internal work... conrod bolts (change the rods while you were at it), and change the pistons... The crank, lifters/valves ,etc are ok...

I bet you two will disagree.... lol


J.

 

hello all, why not have each other's car done up to yr own preferance n see how it goes? it'll be better comparing notes ain't it?

 

Firefox - I will always agree with U.

Malique - I will always agree with U too.

Coolhand - You too.

VF22 is a monster turbo .. big power and can handle 1.5bar++ ...... Lag is BIG to.

Do let me know about the LAG and POWER. I always used turbocharger according to wat my engine need.... without killing to much on the low end.

Cheers.

 

DYNT... I always agree with you and Malique... (not sure why I agree with Malique...but I do)

I agree, the most common fault people make is just asking for power, they dont consider what they want the car for.... Power and torque can be delivered in various ways at different points.

Deciding on what the car will be used for will determine this delivery and those points.


The VF-22 is large.... but if you use it in conjunction with other modifications it will deliver top end and bottom end (ok.. more top end than bottom end... but thats what I'm after...)

When you start approaching the 1.4+ area, you need to consider new conrods/bolts and pistons... To provide bottom end new cams might help...(depends on model/year)

J.

 

LOL!

So do we have a contract?

 

Strange! My STI 5 comes with an IHI VF28. Have yet to get any information on this turbo yet!

 

Seraph...

this is the DYNT, Malique and Firefox thread now.. please post elsewhere...

I'll try and get some info for you on the turbo..

J.

 

Seraph - IHI VF28 is very small .. I have yet to see 1.

I guess this turbo is good for low end. Same as the TD04L .... but it use Rollerbearing.

I was just wondering if Ur compression ratio is 8.8:1 ...... this might be the case??

Firefox - I agree wit U .. SERAPH .. do as wat Firefox tells U to do.

 

OK, since it's your thread, I will just reply and shut up

My compression is 7.8:1



[This message has been edited by Seraph (edited 06-10-1999).]

 

Hey. I only come in when the Village Idiot is required. I didn't even know there was a VF28.

BUT, I guess running a comp. of 7.8:1 means using a smaller turbo logical, no? Surely better for long term reliability.


THE Village Idiot.

 

Hi guys...

Normally....you use low CR with large turbos (high boost)..and vice versa (high CRwith small turbos/boost)

Its all to do with ECR (Effective Compression Ratio). On NA cars all you need to worry about is the basic CR of the pistons..but on a turbo you need to multiply the piston CR by the boost to give you the ECR. This is what you have to watch.. If this goes to high..*BANG*

Hence... you need to balance them.... if you have a low CR and high boost, then that means you will have a poor bottom end and power at the top end (the CR/power is only high when you obtain boost, and to do that you need a biggish turbo which takes time to spool - LAG).

The other way is to have a high CR and low boost. This means that the car is very responsive, because you instantly have a high ECT without waiting for the turbo to fully spool up and generate max boost. When the turbo does spool up you wont notice a massive push in the back, because it will be a small boost pressure. (less than a bar).

I'm suprised the CR on the V5 is so low and fitted with a 28 turbo... *shrugs*

I hear you ask..why dont we have high CR and small turbos.... Because you cant gain as much power that way... If you want large power, cheaply and reliably, drop to a low compression and up the boost. But this will ruin the responsiviness....

The trick is to macth the CR and boost and maintain a safe ECR.... Hence some people up or lower the CR..and dont fit massive turbos... That way they kinda have the best of both worlds... but wont have as much power as the big turbo boys...

Remember the Escort Cossie days... they changed from a large turbo to a small one..and upped the CR to make it more responisve..but all the tuners hated it, becuase it limited the upgrades...

You have to decide what you want from your turbo/engine.

Cheers,

J

ps - I'll find out about the 28 today...

[This message has been edited by firefox (edited 06-10-1999).]