Hi guys

I've got a ej257 block that I will start to build after Christmas for my bugeye sti, going to have it CDB etc.

I'm struggling to pick what heads to put back on it was going to go for the JDM ej207 heads but have been told to stick with the 2.5 and have them ported, dose anyone have any heads for sale and recommendations on where to have them done

Cheers

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Speak with Richard fbtuning about engine spec and heads job.
Alyn asperformance could help to and he can build it
Rcm-not sure they will share their knowledge.

 

Cheers dude spoke to as performance today, looking around 1700 to do so just need to find some 2.5 heads and I'll get them done

 

is not better to put newage jdm sti ones on?
Have You turbo ,headers,intercooler-all setup spacced ?
Seen Matt Baker has jdm heads for 1k with cams valves etc

 

That was the original plan but when I spoke to finch Motorsport he said The 2.5 heads are better on a 2.5 than 2.0 heads, as the combustion chamber matches the bore size, where the 2.0 head does'nt.

So it threw a bit of a curveball when he said that

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Maybe thats why litchfiled sti type25 v2 uses cosworth heads
why not 2.1l ?

 

Was going but when I started to look into it I really fancy the low down power of a forged CDB 2.5 over the 2.1

I've done two lists with parts on both builds and they are coming around the same price point

 

I like 8k redline ,roar etc.
Both forged engines are very good with rcm500 turbos Tmic or fmic.

 

Yeah that's the plan, going to go fmic for the better air flow

Have you got one of the RCM turbos if so how do you fine the lag on them

 

Yes mapped on link g4x by Bob Rawle,rcm500 twinentry
on Process West top mount intercooler
bigger turbo but earlier spool than gtx2971r, rcm450,mdx321t, mdx555,gtx3071r,lm450
very happy with it , 1.7 bar
When mapped Bob said it spools so early,it starts around 3400rpms where my vf37 with front mount started at 3200.
On 2.5l even singlescroll will be better from what I have seen.
Would like to see rcm600 twinentry on 2.35.

 

Those spec below on wr1 sti did 607 on petrol but its laggy. 240 horses at 4k,380 at 4500 revs

 

That's really good power fair play is the meth a 20 percent mix in the fuel tank

How do you find day to day driving at that power

 

Have you got any more information on this?

I always thought 2.5 block with 2.0 heads were doable, all you had to do was get the heads machined. Was really popular in the states and back in the day I know they did the 2.5 with 2ltr classic heads. My car had that set up (previous owner) but I had it as a shell so can't comment specifically on how it drove before letting go. It could very well be they do flow better from an engineering point.

 

Mapped with over 30% meth in tank but will top up to 20%
Did not pushed it much ,drove it few days before winter sorn,have new parts underside and would like to avoid salt this winter.
It is brutal,turbo hits hard ,takes steering wheel to the right , You need to hold it well.
Front end is lifting to,car is on coilovers,it did not happen with oem setup.
Its perfect now,like it should be from factory.
If weather will be not bad i will start using it from February,bought dragy on black friday for some testing and track days.

 

Yeah you can do it I was going to get the 2.0 JDM heads from Matt baker but after taking to a couple of companies, I have been told to stick with the 2.5 heads

Picking a set up on Saturday for 100, then have to save the 1700 up haha

 

Happy days that's what looking for I hardly used it the last couple of years due to having a **** job, but know I got a tidy one it went to TKD and he messed me around for 3 months so missed driving it in the summer

​​​​​ can't go wrong I have avoided the salt since I had all the underneath parts changed and welding

 

Thats a bargain, £100 for AVCS heads well done you mate.

What is the £1700 for lol.

 

Hi the 1700 is for as performance to do the work on the heads it will be a extra 150 to convert it to the 14mm studs as I picked up some sti Hawkeye heads W25

 

Slight spanner in the works sorry mate.

I spoke to Matty the other day when I went to pick up a clutch and some other bits. We got talking as he did the engine on my old scooby. He mentioned there are 2 different head studs by RCM and basically these other ones (think they are called extreme) have the same tensile strength as the 14mm but the benefit is you aren't loosing material to do the 14mm conversion. Might be worth looking into although I'm not sure on cost.

 

I would go 14mm,think studs are cheaper than 11mm extreme and bigger tread is better.

 

But is that cheaper after the machine work? The bigger thread offered more tensile strength (at least how I understood it) but at the cost of loosing material. If you can get the same force without loosing material is that not better?

Genuine discussion as it was a quick conversation with Matty so I'm not too clued up and haven't researched it. Happy to hear thoughts as the game has moved on massively from 10 years ago.

 

150 for work ,14mm costs 600, extreme 11mm around 800
Bigger tread is always better,stronger ,first what will go is a tread not stud itself. doubt material around tread will let go before tread itslef.