So as I guessed, most cars do need uprated heads/cams to achieve the figures.

470 is the average I keep seeing.

 

unfortunately so, I did ask RCM over and over - "will this make 500 with my setup".... 'oh yeah it should definitly, our spec C is standard'.... clearly 'should' is their get out clause.

As much of a name that RCM has, I wont be using again... I had a few issues with this build, and my previous Hawk' build that came from not being told something when directly asked.

 

And you could of saved yourself £275 if you chosen a correct supplier this is if you payed the listed price for it.

On the other hand I bet it feels good at 470, once they on boost they are quite hard and manage the boost well.

Have you tried a bit less boost with more timing?

 

I put a big order in with them, my car (and a friends) so didn't pay close to retail... but still.

472, get it right! haha feels awesome, I'd put new good year f1 eagles Assy 3's on, but they're slipping now, so looking for a winter setup - this isn't a garage queen.

as for boost/mapping - that's out my league - we done a FAIR amount of runs, and bob hummed, and aar'ed a few times so I guess he was deciding the best course of action....

 

Lol. Fair enough.

I think I would of been in your shoes right now because I very nearly bought one and if I did, it was bought to make 500 so understand how you feel.

In the end I went for a smaller turbo and set my target with meth instead.

 

472bhp is close enough. It's only a number. If it goes right enough then happy days

 

or false hopes/advertising?!

 

To put it in perspective, 472 is ONLY 5.6% away from 500. So, would you feel an extra 28bhp out of 500? Even in a back to back test. That's highly debatable.

It's just a number. Yes, we all would like to see the 'next hundred' written on the dyno printout: I was the same when mine made 384bhp.... I WANTED 400.

It's the quality of the map which counts for the enjoyment on the road. As Shaun often states: it's the area under the curve which counts on a road car.

Lest not forget: 450+ in a sub-1300kg car is pure animal on the road. Which I'm sure you can attest to...esp with the Type R's rearward biased DCCD setup (you lucky bugger! lol).

 

if you were promised 2,000bhp, would 1,888bhp be acceptable? Would I receive a 5.6% refund on said promised item? Regardless of discounted price as that figure was quoted...??🙊 (Remember the turbo is sold as a 525bhp 'rated' turbo)
Correct - it is just a duck swinging number, but 500 is a nice number to swing thy's dick with haha

i have no issue with the map - at all👍

The type R's 5spd box would have shat it's kegs if I put this setup through it, it's now on a non dccd 6speed... but he's - naughty non the less haha

 

My post was geared to try to make you feel better about your 'disappointment'...to see the positive aspects. A virtual arm around the shoulder, if you will.

Oops, sorry for the oversight of the gearbox. Of course.

 

What!
You took the dccd away from a type r! That's sacrilege.

 

If they printed you a dyno sheet off for 500bhp you would be non the wiser, as you wouldn't be able to tell the difference.

And before you say anything, my precision didn't do 525bhp, It's a good turbo, I had it on a 2.5 and a 2.1. Certainly good enough for Olly to win the s3 class and me to win the S2 class in the 22b sprint series both on that exact turbo.

I don't see what everyone's obsession with "500bhp" "600bhp" "I need 700bhp"
It's all about numbers for the ***** waving with the majority, maybe make the most of the 472bhp first

 

You could always adapt to the american way of using whp instead of bhp which would put it at about 400 whp I guess, nice and even number

Should be enough in a Type R, let's hope my MD321T+ will be close to that figure.

 

Not read all the posts but I was under the impression a decent set up with heads and cams along with 2.0 bar will get you in the 500,s .

 

Yes looks like head work required. (Read posts )

 

Also if you put it on 5 different rolling roads you'll get 5 different figures, one of those could be 500.
i think all turbos that come with claimed figures are a potential figures especially ones that originated from USA where "race gas" or "pump gas with alcohol" are commonly used.
​​​​​​it seems when you enquired about power figures, rcm should have said " yes it should make 500+ with a splash of meths.
​​​

 

All the ducks have to line up - more often than not - to make the headline figure.

I go by what Paul Blamire advised me in general conversation: EXPECT any given new turbo choice to make 20-30bhp LESS than its actual headline figure (so as to avoid any potential disappointment).

Whilst not ideal - as you could lose out on spool by moving to 'the next' turbo in the range (or its 'equivalent' of another brand) - in the real world, the bhp shortfall happens more often than not.

So, that mantra is not without merit.

 

 

No tuner will guarantee a specific power output, all engines are different (as are rolling roads for that matter) and supporting mods combine to different effect also.

472 is a good power output and you are happy with the map which is very important.

I expect you could take it to a different RR and see 500 if that would make you feel better.

 

Mapped another on a 2.1 AVCS car a couple of weeks back running Vpower fuel. Nothing fancy in the build, no head work, no cams etc just our usual stuff, RCM headers, exhaust, front mount, pump and injectors large enough for the job etc etc.






I really like these units

 

How much difference does the avcs make?
What could i expect from a 2.1 with v5 sti heads?

 

Seems a great option without the expense of twisted setup.

Do they do version for the twisted setup too?

 

torque seems a lil low aswel..

 

Lots of factors to consider.
How well specced is the engine in terms of induction, exhaust, intercooling,
etc.
What compression ratio as that will govern the amount of boost/ignition you'll need/get away with to make decent power.
In my experience these turbos will run 450/500bhp on a 2-2.1 litre engine without head work.
2.35 and 2.5 engines make achieving more power easier of course.

 

Large exhaust housing at it's designed for the American market of 2.5 litre engines. They still work well on smaller engined applications but ideally you want to run 1.9 to 2 bar to get the best from them .

 

Martyn, what are your thoughts on the precision on a STi 5 EJ207 with all supporting mods, mapped to achieve 400bhp? Too unresponsive?

How would it compare with the likes of SC42, MDX321T, etc...?

 

always use the smallest turbo you can to acheive the power goal. A turbo rated for 500hp on a 2.5 will always be a bit laggier on a 2.0.

Id be going for something like an sc42 on pump fuel or a sc36 and some meth.... Its all about response!

 

I wouldn't choose the T or the Precision for 400bhp to be honest, SC42 yes or a Billet 18G would be pucca for that.

 

Cheers MJ. Thought so.

Just wondered if that Precision unit - despite it being a 500+ turbo - had 'comparable' spool-up to the smaller 400+ turbos mentioned, that's all.

Just checking to see if was some kind of 'jack-of-all-trades' wunderkind ...

 

Unfortunately the closest thing I've seen to the 'jack-of-all-trades' turbo is the ubber responsive Borg Warner EFR range. They have the best spool per size of any turbo I have currently tested, but a bolt on version isn't and probably never will be available.