fiestaturbo.com

[fiestaturbopete]

hi all just done a hybrid t3 conversion to my rs which has also got beige injectors and 195 chip. well impressed with the power but it seems well laggy now i dont have a dump valve. should i put 1 on some people say they reduce lag others say its a waste of time any help would be great thanks

[GavStyli]

what cam u using?
btw should post this in tunning section

[285Andy]

exhaust housing size?

[fiestaturbopete]

standard cam heard i ve heard that the performance ines arent that good on fiesta s . exhaust housing is 2wd cossie i believe

[285Andy]

if your engine is standard 1.6cvh and you have a cosworth ex housing then id sudgest that this may be your problem. i am however not sure how big the cossy ex hous is but i thought its atleast .48 and if thats the case, you'd be much better off with a .36 exhaust housing off of a standard escort rst which should hit boost around 3000 rpm as opposed to nearer 4000 rpm. thats all i could recommend really but worth seeking profesional advise

[fiestaturbopete]

so u dont think a dump valve would help

[White2i]

no mate you have to options one is to get a smaller exhaust hosuing as has been said, or the second option is to have the head worked on eg polished ported, bigger valves and get a cam fitted and then get it remapped and it should boost better have less lag and run closer to 220bhp ,

[Oranoco]

if your engine is standard 1.6cvh and you have a cosworth ex housing then id sudgest that this may be your problem. i am however not sure how big the cossy ex hous is but i thought its atleast .48 and if thats the case, you'd be much better off with a .36 exhaust housing off of a standard escort rst which should hit boost around 3000 rpm as opposed to nearer 4000 rpm. thats all i could recommend really but worth seeking profesional advise

Absolutely spot on

No a dump valve will do nothing but make you sound like a bus.

Head work really isn't the answer either as head work on a turbo car isn't nearly as critical as it is on normally aspirated cars. You need to sort the root of the problem (the overly large exhaust housing) rather than trying to fudge a way round it.

[ianFRST]

so its a cossie sized turbo?

if so, thats about the equilivent on a stage 3 escort rst item, so thats why it would be laggy

[chargedt40]

If you have the cylinder head ported and polished by vulcan engineering then they will fit oversized exauhst valves to help exit the gases quicker and this will cause the turbo to spin up faster and come in earlyer on the rev range not sure how much thow.

[Oranoco]

If you have the cylinder head ported and polished by vulcan engineering then they will fit oversized exauhst valves to help exit the gases quicker and this will cause the turbo to spin up faster and come in earlyer on the rev range not sure how much thow.

Speak to Christian or Tony on PassionFord about Vulcan and I'm afraid as I've said above polishing and porting the head will not cure the problem. Bigger exhaust housing = more lag (to a large degree). The best and only sensible option is to fit a .36 exh housing. Not only will this actually work but it will not cost half as much as having a load of unneccesary head work done.

[fiestaturbopete]

thanks for the help. think i will take it to power engineering to get it all set up properly then c how it goes

[BUTRE]

the quickest way to get less lag is going the 0.36 A/R exhaust housing, like already said here.

If you want to keep the 0.48 then it's going to be expensive since you'll need a better exhaust manifold (assuming you are using a ERST exhaust manifold) with long and equal primary pipes. Also you should get a bigger inlet plenum so that off boost the engine breads better.

Also, go single pass IC with minimal pipe.


Dump valves only reduces the turbo lag when quickly up shifting gear.

[Oranoco]

Actually the stock ERST manifold isn't a bad flowing bit of kit. My mate has tested it and as it worked well enough is still in use on his 400bhp Fiesta

[BUTRE]

Actually the stock ERST manifold isn't a bad flowing bit of kit. My mate has tested it and as it worked well enough is still in use on his 400bhp Fiesta

We are talking about reducing lag and off boost torque, so NA exhaust manifold rules aplies here: long and equal primarys.

[dawsfezzie]

Actually the stock ERST manifold isn't a bad flowing bit of kit. My mate has tested it and as it worked well enough is still in use on his 400bhp Fiesta

this is what i use on mine and i have not probs with lag, ame set up as you, 195, bieges, cossy pump, -31.

[fiestaturbopete]

will keep the cossie housng for the time being cos when it does boost it goes well but i ve got another problem i cant seem to get the boost above about 0.8 bar have adjusted the actuator ( shortened the rod) and fitted bleed valve but it does nt seem to want to go higher is this related to the lag problem? thanks for all the advice by the way

[Oranoco]

Just a quickie mate but I've only just changed from a .36 echaust housing on my S2 to a .48 and on the old housing it made 248 and on the .48 I've only gained 8bhp . And being brutally honest the car pulled harder on the .36

End of the day fella it's your choice and you've got to do what you see fit

[fiestaturbopete]

not sure what to do. dont suppose any 1 is selling just the exhaust housing for a standard t3 r they. booked the car in to be tuned at the end of the month will c how it goes. i am happy with it but want more boost it is a new turbo so i cant understand why i cant seem to get more boost out of it

[fiestaturbopete]

by the way i only have standard fuel pump and intercooler do i need to uprate them

[Oranoco]

Definately. The fuel pump is highly recomended but the intercooler is an absolute must

[BUTRE]

by the way i only have standard fuel pump and intercooler do i need to uprate them

You should uprate both.

the std FRST fuel pump is too weak to run safely above 170bhp on a 1.6 CVH. To make things worse, I assume that yours is not new so you are facing the risk of the fuel pump seals crack open due to the incrised fuel pressure at the rail when boost going up.

A good eficient intercooler is also very well welcome! It will help drop the ACT's but the bigger it is, the more lag it will give you.
Intercoolers with bad cores or/and bad end tanks will kill some boost pressure.

[fiestaturbopete]

what would u recommend to fit as on the website they say the pace ones arent very good i dint reallly wanna hack the front bumper to much but need a decent intercooler. once again thanks 4 all the help

[Oranoco]

If you don't want to hack too much of the bumper your best bet is the Pro-Alloy item. TBH though you can cut the bumper and retain most of the standard looks. My bro has just fitted his Fiesta with a GRS and despite the bumper cutting with the bonnet shut it doesn't stand out that much at all