Having a new turbo built up (stage 3 you might say) and was considering going 60 trim on the compressor wheel instead of 55, previously running a 50 trim.
How will this effect the turbo's response/performance and will the turbine housing/wheel become restrictive at all? Obviously it will mean more lb/min of flow in at any given turbo RPM but what other benefits/draw backs are there?

I'm on stock manifolds but with a NMS ported head (stock valve sizes), the off the shelf Newman RST cam and slightly higher than stock CR, still a 1600cc.

All thoughts and input welcome!

Compressor maps...





Can't seem to find a 55 trim comp map yet....

Cam spec...

 

Also been given the option of a T34 turbine wheel in the RST .48 housing, which i'm told is the same size as the RST wheel so won't increase lag.

Any thought's experiences please...

 

the 60 trim and a 0.48 ex housing is basically a cosworth 4wd turbo or stage 3 t3 erst.
i ran one on my zvh and made full boost (23 psi limited) by 3000rpm, i guess it won't be much worse on a 1600cvh.
maybe full boost by 3300rpm.
t34 wheel would be a much bigger move though, would be much laggier, but better torque when it comes in.
all depends how you want it to drive really.

 

60trim t3 on a mates nms build car dosnt work much below 3750

My 55trim work from a bit over 3500

I would say 55trim t3 mate

My dad advised me against 60 trim iirc due to being lagger and they really howel on full boost?!

 

2.0 compared to a 1.6 , bit of a difference when it comes to the ex housing , the little 1.6 cant get as much as a 2.0 through, and if it does then that means u will have to get a 55 or 60 trim and on a 1.6 thats going to be laggy

IMO

 

I dunno the answer to your question Karlos but im on a 55trim T3 standard comp and manifolds etc and i get full boost by 3,300rpm. Altho i am only running just under 1bar!

A bit of a side point, but what sort of diff did the newman cam make over standard?

 

Who's building the turbo for you Karlos?

 

Darren just reading ur spec in ur sig, what sort of power does your car produce?

 

Im not an expert on turbo's but i recently put a T3 with .63 housing on it and it starts spooling at 4,000rpm and was on full boost at 5,000rpm then youve only got 1,000rpm+ left till your changing gear!

Goes like s**t when on full boost, Depends if you like lag or not?

Joe

 

That's ridiculous Joe, something wrong there mate

T34s or bigger are on boost before that!

 

I know, thing is i dont know what psi i was running but it blew my engine up to say the least so i think it might have been running some high psi..

 

None at the minute mate as the head is at the engineers & the turbo is off and im replacing it, just not sure what to go for yet. Once all back together and setup i'll post up some figues

 

Big big difference between the way a .48 spools on a 2.0 and a 1.6 Sean.
Thanks Jimbo, what do you mean by howel?? lol
TBH I can't really say as I changed too many variables at once when I fitted it! But it's not lazy! lol
IIRC the profile is similar to that of a stock RST cam but flows more up top.
Wilky mate.
.63 on a 1.6 will behave like that! Anyone remember D4's first 300bhp print out?! lol

 

well karlos my t34 starts spooling around 3200 and kicks hard at 3700 and full boost around 4100 i would of thought but when revved out you don't really notice the lag then but depends on the power your after, if it was me doing it over again i'd get a stage 2 as you were and get a 50 shot of nitrous in the mix then you could reduce your spool up time with the gas and then still have more power top end if you needed it would make one hell of a road car that would give most stuff a run for there money and be quick up the quarter like gav sty

 

Cheers for all your input fella's... Going with the RST .48 housing & turbine wheel and the 60 trim comp wheel so we'll see what I can squeeze out of that!

 

Whats that costing you if you dont mind me asking? I Need a turbo!

 

PM Wilky mate if you need a price, depends if you have one to trade in so to speak and exactly what you want.

 

What made you go 60trim mate?

 

Project RS - How about a stage 3, 48/55 with a 50shot spool her up and go...!

Karlos - Keep us updated, should see some good gains! Must try and get a ride in yours at some point after what jonnie tells me

 

TBH I just thought fuck it why not! lol
Means I wont have to work the turbo so hard to hold boost at high RPM's as it will flow more than the .55 but at the same RPM (turbo), my limiter will be somewhere between 7200rpm and maybe 7800rpm (if it's still breathing up that high) so will be making the most of it!
It's going to be an animal mate for sure and yeah of course you can have a ride!
Hopefully by the end of next week I'll have the turbo on and mapped (well 90% mapped, off boost area will take a little longer), a longer final drive ratio fitted so I'm not topping out at 125mph and wheel spinning every where! Also need to check my lifter gaps too as it's been a while and want to have as much lift/duration as possible with this big arse turbo going on there.

 

I can't get mine to breath over 6500 really as it's starting to fall off power

When my new box is in I'll be running 25psi at 6500 rpm so circa 290bhp with low charge temps as I have ignition advance/retard with act


What power do you think e old girl will do with the big turbo?

 

why is everyone making the assumption i ran a 2.0 zvh??????????
it was a 1.8, but i'd still reckon on a slightly later spool, certainly not as bad as a t34.

 

Sounds like your baby turbo is running out of wind towards the top end there Jim!

 

Thats interesting, what do you think your restriction is Jimbo?

I'd like to see high 200's but we'll just have to see!

 

I don't know the restriction tbh it makes the power but I just can't get it to go higher through the rev range

No matter what I do, cam timing is absolutely spot on for the latest possible power and that's 6-6.5k

It works well down low though which is what I want. I Only have gold cap hydraulic lifters so don't want to be working it much further than my limiter of 6800 anyway to be fair to the poor thing

 

Karlos I ment to ask, wht inlet do you have on it?

 

Hmm interesting! I would of thought with your head and inlet it would breath all the way up, maybe the 55 trim can't quite flow enough? It holds boost to the limiter though I guess?
Stock EFI inlet, will be changing to modded N/A MFI inlet with Cossie TB soon though (or custom inlet), get rid of all those 90 degree bends!! lol

 

Drops a tiny bit before the limiter

Into be fair I think it's the .48 ex housing, it's just up against a wall, I have a .63 here but want the throttle response which is good for a cvh to be fair!

I am 100% happy with the engine though it's awesome

Ps, I'd deff get a inlet on there if aiming for high 2s as they're shit standard mine freed my engine up so much that I had to go up a lot on the exhaust sideof the cam to get the air out

 

I thought the EFI manifold flows for over 350bhp? Obviously it's design is shite as is the whole path the air takes after leaving the IC! lol
.48 is the restriction? Hmm... I know the cossie housings flow better... Will be interesting to see what I can get out of mine!
.63 is normally terrible on a 1.6 CVH, would be good to see how one responds with your head, cam and manifold though as you are breathing so well over a stock engine.

 

That's it, mines really restricted by the exhaust side of things!

The inlet design is awful and I'd stay away from it if going for more power

Thats my honest opinion on it

My last engine failed due to a boost spike and the centre two pistons were the ones that went first

Either way, be interesting to see the figs, even better if it was on our dyno so it was a direct comparison

 

Yeah it's on my list of things to do for sure!
looking at the manifold you can see why it was the middle two that failed.
Your only in Peterborough I'll whiz up for a power run once it's fitted and mapped mate!

 

We don't have rollers bud only a super flow dyno

 

Ah! That would be a problem! lol

 

Nah! Just flip the engine out and get it sat on there!

 

Aye bang it on there!

 

7800rpm ?? mine snaps rockers and pulls studs out the head at 7200 and thats still at only 22psi

 

Mmm my thinking too, good advice......i too think you may struggle keeping the engine together for long at much over 7k, i was told by a very reputable cvh tuner there are a 'few' flaws you will come across if you rev over 7k for any length of time
I too was going to rev mine beyond 7k as the engine was still making good power but capped it at 7k in the end after that advice, engine sounded was a screamer anyway so dread to think what it would have been like at 7.8k lol!!

 

lol
Being realistic the engine is unlikely to breathe well enough at those RPM's to be useable, Jimbo's has a much better inlet than mine and that hits a wall at 6800rpm so I doubt I'll be going much over that myself..... But I'm always up for a laugh so we'll see how she does! lol

 

Good to hear that you are putting on a little larger turbo.
I will be most interested to hear how the .48 exh, 60 trim compressor T3 works out on your 1.6.

I can't remember what valvesprings you were using?
Standard Ford singles are good, but nowhere near enough pressure to allow 7800 rpm.
Anyone who has a 7000+ rpm standard Ford single spring 1.6, has a faulty rev counter

Cheers

 

Mine wouldn't even go to 6500 on STD springs

6000 fine but as soon as you crept the dyno up it would miss, 24psi boost