Reubens Second Single Conversion thread. 56k fail.

[chrisjunkie]

Not necessarily. Head gaskets probably be about $500 max

[gazzy2000]

 chrisjunkie said:

Not necessarily. Head gaskets probably be about $500 max

oh ok, well if he did the work himself it wud be worth it, dunno how muchy a garage wud charge for that?

[chrisjunkie]

yeah if a garage was to do it, probably be better getting an STi engine ;D

All my prices are with me doing the work / clubsub helping out hehe

[Guest]

looking good, i hope you're going to repaint the manifold

[mattapo]

 gazzy2000']

[quote name='chrisjunkie said:

Not necessarily. Head gaskets probably be about $500 max

/quote]

oh ok, well if he did the work himself it wud be worth it, dunno how muchy a garage wud charge for that?

Apparently changinf the compression with gaskets is not a option with the BH GTB. You have to do it with pistons. So if you have done a big end, get a short block off possom motorsport otherwise get a tuneable ecu.

[Guest boostin]

 mattapo']

[quote name='chrisjunkie said:

Not necessarily. Head gaskets probably be about $500 max

/quote]

oh ok, well if he did the work himself it wud be worth it, dunno how muchy a garage wud charge for that?

Apparently changinf the compression with gaskets is not a option with the BH GTB. You have to do it with pistons. So if you have done a big end, get a short block off possom motorsport otherwise get a tuneable ecu.

Why can't it be done with gaskets?

[chrisjunkie]

you can add a huge amount of space with gaskets. More than enough to drop the compression ratio

[mattapo]

I'm just going off what I have found in my investigations

[Guest]

 mattapo said:

I'm just going off what I have found in my investigations

Do you have anything to back this up? about the gaskets/compression issue

[mattapo]

 STi-TypeR']

[quote name='mattapo said:

I'm just going off what I have found in my investigations

/quote]

Do you have anything to back this up? about the gaskets/compression issue

something about it being to much of a change to do with just gaskets. 9:1 to 8.5:1.

[Koom]

 mattapo']

[quote name='mattapo said:

I'm just going off what I have found in my investigations

/quote]

Do you have anything to back this up? about the gaskets/compression issue

something about it being to much of a change to do with just gaskets. 9:1 to 8.5:1.

According to some quick calcs with some close to approximate numbers for an EJ20, a compression ratio of 9.1:1 gives a total volume of 54.79cc @TDC.

8.5:1 gives 58.66cc.

Difference of ~3.87 cc which can be found by adding 0.6mm to the thickness of the Headgasket. If you can't find one thick enough, do it old school style and run two headgaskets sandwiched together.

Travis would do it.

Edit: This doesn't mean that I condone doing it this way. Squish volumes etc will be all messed up, but it may be an easy fix.

[Guest]

Increasing the squish volume could give you more det due to the extra unburnt fuel, worse fuel consumption and less power

edit - i meant to say squish volume... doh

[Guest boostin]

 Qwerty said:

Increasing the squish could give you more det due to the extra unburnt fuel, worse fuel consumption and less power

We're talking about going the other way...

[Koom]

 boostin']

[quote name='Qwerty said:

Increasing the squish could give you more det due to the extra unburnt fuel, worse fuel consumption and less power

/quote]

We're talking about going the other way...

He's right, although he's talking about the Squish Volume, not the amount that the chamber is "squished".

[Guest]

at least someone understood my poor grammer

Anyways wouldn't the simpler/cheapest solution be to lower the boost to equal the Sti's dynamic compression ?

The higher comp would in part offset the sti's higher boost and offboost it would be a better car.

Or use a WRX ecu of the same vintage which probably had higher compression as well.

[ReubenH]

 gazzy2000 said:

I had suggestions thrown at me to use a standard WRX ECU because they are made to run a 9:1 CR engine. But the way i looked at it was the std WRX ECU isnt tuned to run yellow 440cc injectors for a start, so i stopped there because you cant tune a std ECU let alone an STI one and i sure as hang wasnt ganna put grey injectors in!!

Sorry gaz, that's incorrect. All phase-II turbo's run yellows, a WRX, or even foz ECU likely would have worked perfectly.

Only SOME (Not ALL) Ver 3/4 WRX's run greys. It's only the EJ20G WRX"s that ran them, the EJ20K WRX's got the yellows.. generally the sedans got yellows and EJ20K's. Either way, all V5/6's, WRX's and STI's alike run the later type yellows.

[gazzy2000]

 ReubenH']

[quote name='gazzy2000 said:

I had suggestions thrown at me to use a standard WRX ECU because they are made to run a 9:1 CR engine. But the way i looked at it was b]the std WRX ECU isnt tuned to run yellow 440cc injectors[/b] for a start, so i stopped there because you cant tune a std ECU let alone an STI one and i sure as hang wasnt ganna put grey injectors in!!

Sorry gaz, that's incorrect. All phase-II turbo's run yellows, a WRX, or even foz ECU likely would have worked perfectly.

It's just Ver. 3 WRX wagons, or maybe Auto WRX's for V3 that run greys. Either way, all V5/6's, WRX's and STI's alike run the later yellows.

ahh yip, then if the std ECUs from that year run yellows and the same AFM etc, apart from higher rev cut what does a STI ECU give u over the stock one? (boost is dam near the same too)

[ReubenH]

Different tune obviously, and as you found, the STi engines have lower CR's. I also now know that WRX/Legacy is shim over bucket, and STI is shim under which copes better with the higher redline.

[Drunkenmonkey]

haha this thread is off topic but rather informing

[gazzy2000]

interesting aye! i wonder if to save money and hassle using a std v5/6 wud have been the go, coz really the name of the game was to get a single T yea?

So any single T be-it an STI tune or a std WRX tune wud be better than the TT and VoD.

Making the STD WRX ECU the most cost effective, and quite possibly the only one that works (unless you are doing an STI shorty at the same time where the CR is right to an STI ECU)

In saying that do ppl that hv std foz's that hv put sti ecu's in get real big gains?

[gazzy2000]

 Drunkenmonkey said:

haha this thread is off topic but rather informing

yea sorry drunken.

but we are really gettin somewhere ay, which is absolutey invaluable if we are to help future Clubsubers do a TT to ST on a BH!

[Guest]

Another factor which doesn't help is that the RSK/GTB Legacy is quite abit heavier than the Sti.

Which puts extra load on the engine.

You can get away with higher ign timing on a lighter car, lower gearing can help as well

[Drunkenmonkey]

 gazzy2000']

[quote name='Drunkenmonkey said:

haha this thread is off topic but rather informing

/quote]

yea sorry drunken.

but we are really gettin somewhere ay, which is absolutey invaluable if we are to help future Clubsubers do a TT to ST on a BH!

no need to be sorry lol i was just taking the piss

[EJ20T]

 ReubenH']

[quote name='gazzy2000 said:

I had suggestions thrown at me to use a standard WRX ECU because they are made to run a 9:1 CR engine. But the way i looked at it was b]the std WRX ECU isnt tuned to run yellow 440cc injectors[/b] for a start, so i stopped there because you cant tune a std ECU let alone an STI one and i sure as hang wasnt ganna put grey injectors in!!

Sorry gaz, that's incorrect. All phase-II turbo's run yellows, a WRX, or even foz ECU likely would have worked perfectly.

Only SOME (Not ALL) Ver 3/4 WRX's run greys. It's only the EJ20G WRX"s that ran them, the EJ20K WRX's got the yellows.. generally the sedans got yellows and EJ20K's. Either way, all V5/6's, WRX's and STI's alike run the later type yellows.

im going to throw a little spanner in the works, only d rev gtbs and rsk got the 9'1 cr, and i discoverd today that my car and all other d revs have top feed 565cc pinks, so that kills using ver 5/6 stuff or ver7 (avcs) unless u downgrade injectors and manifold

[EJ20T]

 gazzy2000']

[quote name='chrisjunkie said:

Take engine out and then measure up etc. There is probably a chart floating around somewhere listing volume of different blocks.

Then just get the headgaskets to match. Yeah its not going to be cheap but cheaper than getting a whole new engine

/quote]

ya, but would getting a tunable ECU be a cheaper option again?

but if u have a ver 7 ecu it is tunable