Hi all,

I have what I think is a stage 3 turbo. Bigger exhaust housing, 360 dgree bearing and bigger compressor wheel. The exhaust housing is originally off a sierra 4x4 which is making my car really laggy and just no fun to drive. I have an original Rst exhaust housing and was wondering if I can swap it over. I have been told I can as the exhaust turbine is no bigger but I just want to confirm it.

Cheers
Dave

 

as far as i no you can

 

Cool. Thankyou for the reply.

 

yes u can.

 

Hi

I have a stage 3 Turbo Technics and am running 16psi and mine isn't laggy at all, in fact it's surprised a few people with how spritely it is

Has it been set up lately??

 

Not lately no. Are you running low comp aswell?

Cheers
Dave

 

No it's std comp
I did expect to notice more lag tho from having the stage 2 to stage 3 but not noticeable

 

Hmm. Might get the turbo checked then. Its really laggy as in not even starting to pull until about 10psi. At 15 its better but want more bottom end.

 

Linsay, u are just used to it, but it IS laggy, u cant get away from the fact. It isnt on full boost till 4k. I dont think mine is laggy, but then i drove Mike's the other day with a std turbo, and it came in much lower.

A stage 3 turbo is never going to pull bottom end with it's 0.48 housing.

 

Maybe i am a bit now Rick Would like to say this for it tho, it's the best it's driven since i've had it - just keeps going

Maybe if davidnormanuk wants more bottom end, it ain't right for him
All a matter of opinnion there i reckon

 

yea they do keep going, and i love mine - just diff driving style.

 

I have had the pleasure of risking life and limb and have been in this car with Linsay behind the wheel, and I have to vouch for it. It really DOES pull very well from low down. I was surprised. It pulls as well as AndyRST's car does with a standard turbo.



Very impressive car

 

It aint laggy.

response is at 3k and there is no lag between gearchange.

It pull's the bottem end perfect.....

Suggest you find a better tuner if you believe the the above quote....

My T4 car aint laggy either and hits full boost at 4k
All the T34 RST cars i have worked on are hitting full boost about 3400 also.

 

Surprising for what it is isn't it Tony

 

had the exact same thing on my old escort,got the same spec on my frst now but with 2wd exhaust side,much better

 

Ok, if ur being picky..... I can beleive there is no lag between changes, there isn't on my car. But the boost threshold is higher with a bigger exhaust housing, it has to be it's simple themodynamics!

My car will make boost under 3k if need be, but with a 0.36 it spun up earlier.

Here u can see that Linsay's car with a stage 3 turbo hits full boost around 3700rpm. And that's a bar of boost, if it were 1.5 etc, it would take longer.

Nothing wrong with this as such, as the rest of the engine is specced for it, and it goes well. The point is, that if the topic starter wants more low down grunt, the most effective way is to go back to a std exhaust housing. If you speak to Karl, i'm sure he can confirm it for you.

 

Sure is! I think I need to drive it to give it a proper test.... Round Bedford would be best

 

Yeah rick i will speak to karl and take his advise.....suggest you do the same.....I am not being picky, your comments are always the same.....car is always shit according to you....so do everyone a favour and accept that its not......

Lag is nothing to do with turbo response.....and rollers IMHO don't show an on the road scenario so having drivin the car is its current form i will go on my own experience and not nobles graph thanks



What is amusing is the fact 2 people on this thread who have recently been in the car say its not how you describe it yet you still feel the need to post about a car you now have no experience of.....not sure how this is actually possible.....

 

Anyway thanks everyone for the advice. Found why mine was too laggy. Took it apart last night and found the Turbo housing to be cracked. Put a standard housing on it and will put it back on the car tonight and see how it goes.

Cheers
Dave

 

I'll put in my thoughts here..........as its my car

In std form there was little lag. Adding the stage3 head and PE cam lost some of the bottom end response but it was still pretty good and the softer torque curve made sure that it stopped eating gearbox bearings.
Adding the Stage2 TT blower made it sooooooooo much more laggy. You'd really have to think ahead to avoid the lag. Catch it in the wrong gear and a Fiesta 1.1 would be sailing past.

The spec of the Stage3 isnt so different from the Stage2 but I think the important thing here is that Linsay is running less boost with a much larger intercooler so she can run more advance which will give it better response.

Either way its hard to get round the fact that the larger the housing the more laggy it will be - thats basic fluid dynamics. The same zorst gases are coming from the engine but now they have to spin up larger heavier blades in a larger zorst chamber so the force is reduced - hence more lag.

I havent driven it since the addition of the stage3 blower but (and no disrespect to Linsay) she said it wasnt so bad with the Stage2 which to me tells me that she loves the car so much she jsut see's past its shortcomings.

My advice is to go for an intermediate turbo that wont be so laggy. My favourite set up of any RST I'd driven was with the std turbo running 1bar boost and with a good head and cam. Nice wide power band with little lag. None of this all or nothing delivery that feels fast in a straight line but on twisty narrow lanes you never get the reponse to make decent progress.