hi
bought the 4x4 turbo off moonstone matt
been bolted on and is running pretty good, pulling powerfully
however when it comes to 4500/5000 revs in 3 gear, revs suddely cut out and car dies, take foot off and put back on and it continues accelerating again.
if i come to the kill point again, this time only giving it half throttle at 4500/5000 revs, the car accelerates through but is popping madly
also it seems to be blowing off the air metering pipe on the left hand side of the engine at fast runs.

Anyone offer some help?

 

sounds like turbo surge, caused by too big of a compressor wheel in the turbo.
HTH

 

does this mean the turbos faulty?

 

is ur bottom boost hose soft? Is the car chipped? How much boost is it running?

 

yeah check the bottom boost hose isnt soft, had that problem before at high boost

also boost limit being hit?

 

ROLL GOLD DICE,
there aint nothin wrong with that turbo mate! i drove the car that that turbo came off loads of times! and i ve put those turbos on loads of me mates cars too! have you had the fuelin and timin checked? also is the boost exceedin the chips limits? and check ya boost hoses! some time hey suck in causin restrictions and cuttin out!

 

Sounds like a fuel prob, go get it tuned mate.

 

That sounds like an over boost strategy in the ECU. What type of chip are you running and what boost?

What spec turbo was you running before hand and what spec is the new turbo?

Have you had the fueling checked since swapping to this new turbo?

Have you checked for collapsing boost hoses as people suggest above?

 

id say overfuelling or damaged/loose/worn pipes , i had the same problem , it was a loose pipe........

 

yea davey boy i know the turbos ok, i had it checked before i put it on.
the car was running well before i put the turbo on, obviously i need the car set up.

with regards to what ppl suggested, i was told the car was chipped before i bought it but dont know what exactly, how do i find out what it is?

DazC, the car was standard turbo before, now running saph 4x4 cos turbo, unsure of boost (no gauges), havent had the fuelling checked yet, what hoses do i check?

thanks for the suggestions

 

Ok - ur car is about to melt. Seriously. Im pretty sure ur hitting some boost limit. You have no idea what boost is, and what your fuelling is. Get it to a tuner ASAP.

 

cheers rick. nice to have someone tell me straight!
im from south wales, anyone have any suggestions? interpro?

 

Yea, they'd be fine

Keep it off boost till you've had it done.

 

cheers rick

 

so you just bolted on a 4x4 turbo?? so as long as ur ecu is chipped and you av a decent motor and i/c you can bolt on a bigger turbo but just have the metering unit adjusted!! U dont need another chip upgrade? wats the characteristics of the 4x4 turbo, loads of lag?

 

well theres a bit of lag, not enought to put me off mind.

My mate who i bought it off said it was chipped, and its got konis and cossie brakes on front, exhaust, knN, 17"s, definatly felt like a 170/180 car. Doubt he was lying.

the motors only got 28500 on the clock, and i know the car hadnt been used for 2 years prior to me buying it, and before that i knew it only went to local event (w'wales rs club).

No intercooler tho, thats the next thing im adding with this turbo.

will i need a chip upgrade do u think?

maybe more lag but when it comes it, it comes in! (until it cuts out that is)
cheers cuvner

 

i think the chip upgrade only removes the boost and rev cut outs, maybe the ignition map is changed too? but fueling is a big issue as you've seen in the other posts! you will melt your pistons so becareful with booting it!

 

i wont be booting it till i set it up now dont worrry.

so if i pay interpro to r/road it and set it up, theres a possibility i may have to get a new chip too?

 

possibly, if you need new ignition maps for the different turbo! Not sure exactly im sure some1 here will put you straight on that!!

 

chip is fine, leave it don't change it

only reason to change it would be to have more boost, some chips have a boost limit

Listen to Rick, most people try to go over an beyond his suggestions - but he DOES know what he on about

 

cheers. as long as the car runs clean without blowing up after im happy.

 

IMO the cossie 4x4 turbo is a good one to use. If it's straight of a cos, u have to rotate the housings so all pipe work aligns, but it doesn't have a cut back exhaust wheel like a normal "stage 3" does, so there's less lag. I would defo use a NEW std cam on this turbo, a 285Tat the most - the t2, cvh35 etc is a no no. You can squeeze out 220-230nhp on this setup using a std head, providing you have a good intercooler.

The best all round RST is one using a stage 2 turbo and a decent big valve head, witha wild cam like a cvh 35. This will give you upto 240-250bhp, vittually no lag, and rev cleanly past 6k. At this point, i'd defo use an mf2 - even if it is only for driveability and fuel economy.

Rick.

 

got mine rolling-rdd today at silverstone, made 196bhp and best of all 229ft/lb of torque @15psi, well stoked at that! Def after this no lag business, cld do the cossie turbo combination 1st then wen i re-build my motor go the stg2turbo cam and 5th injc setup! sounds gd! wen u say wild cam? flames and missfiring? thats wat i want!!!!
Do u need fueling looking at wen you put the 4x4turbo in as a straight replacement for a standard one!

 

You always need the fuelling looking at when you change anything on the engine. It's always going to fine to drive off boost, so u can get it to a tuner without a prob. Don't forget that you needa custom downpipe when you fit any cossie turbo, as it has a differnt bolt pattern. BY wild cam, i mean anything with a bigger overlap/duration/higher lift etc. Note that a wild turbo cam is still quite mild when compared to a wild NA cam, as u use much less duration on a turbo cam. Larier cams work well with the std exhaust housing - they're designed to extend the top of the rev range.
On a bigger exhaust housing, the reduced back pressure makes the engine much more revvy - adding a lairy cam just increases lag, and narrows the powerband. CVH's seem to pretty sensitive to exhasut housing size when it comes to the rev range, much more so than cossie lumps.

Rick.

 

please say u didnt use that mobile RR

didn't even have a fan for the engine PMSL

 

Thats right i too have a saff cossie turbo on my rst..i have a piper t2 cam ,big valve head etc and it dont hit full boost till 4.2k which reving to 6.2k limiter is fooking crap..

I will be trying a STD cam to see if that helps

 

it will

 

yea, there was a fan, only wanted a ball park figure, well impressed wiv that and it wasnt exactly ideal ambiant temps so can expect a lil bit more gogo on those cold mornings/evenings!!
So wiv the 4x4 setup and the other setup you mentioned(cvh35cam and stg2 turbo etc) will i need a 5th injector? you read alot of people hav um wen running over 200bhp!

 

U can get away with out a 5th injector by increasing the fuel pressure on the std system. It's far from ideal, as it richens it off boost as well, giving poor fuel economy, incresed oil consumption etc. It's a much nicer car with a well set up mf2.

 

Sorry to but in. I have a Cossie 4x4 Turbo housing on my ERST with a standard ECU and new standard cam and there's loads of Turbo lag. I am in the process of getting a chipped ECU but is there any way I can reduce the amount f lag. I'm even thinking of going back to a standard turbo as I've lost loads of drivability.

Cheers
Dave

 

so basically seeing as ive only got a chip and a filter, putting this turbo on was a good idea? (charegcooler coming soon)

 

Dave - the only real way is to run more igntion advance, which will help the turbo spool up quicker. It is still going to be laggy, no matter what you do, as it's a 280bhp turbo. The advantage is, it will rev much more cleanly.

Dice - As long as u dont mind the lag, and want power, then yes it is.

 

Same as me mate im taking mine off the turbos too big i come on full boost at 4.3k its very crap

 

What gear in?

 

2nd 3rd

4th is just over 4k

 

hey rick, whats an mf2?

 

http://www.aquamist.co.uk/cp/mf2/mf2.html

Excellent bit of kit.

 

Got a 4x4 turbo on mine spec is low comp bottom end,stg 3 head cvh35 cam and a grs only running around 10psi at moment as its not been set up yet.i think it goes ok for what boost im running cant wait to get it turned up there is a bit of lag but when full boost cut in about 4k its seems ok to me...but then again i have been running around in a 1.1 pug for a year while getting car sorted...