trappy, nothing needs to be done to this turbo along lines of porting etc as tbh i dont think it would be worth it too much, but its upto you. this turbo ran 340bhp with no hassel and was hitting full boost by 3600rpm (1.4bar)

Upto you tho

I would'nt think it will be a problem porting it for peice of mind

Wish i could be Ar**d to do mine though

Ben

It's got nothing to do with the actuator or boost controller. It's because the wastegate hole is improperly sized and can’t dump enough exhaust gases. Fitting a free flowing exhaust decreases turbo back pressure and increases the chance of boost creep. There are three solutions to cure boost creep:

1. Increase the exhaust back pressure
2. Port the wastegate
3. Go external WG


Mine is a full 3” all the way, I got the taper chopped out when the exhaust was fitted.
2.75” may still be ok but mine only started boost creeping when I got the full 3” system.

well il be heading off to bristol shortly to Flea's soo we will see what happens today

Jason, have you actually checked your actuator to make sure it is not too tight?

I honestly think you need to look into it as hitting a minimum of 1.7bar at redline is just not normal regardless. There are enough people running these turbos with full 3" systems on coupes and other cars which don't exhibit anything like the boost creep you have. Indeed an extra 0.25" from the cat back is not going to have a significant impact on backpressure.

just go external wastegate and get the noise to boot :-)

I assure you the actuator is fine, if I set it to 1.7Bar it will hit that at about 3250rpmish, if I set it to 1bar it will only start to creep up to 1.7bar at 5500rpmish. It’s not a problem for me infact I don't want it fixed

tweaking has now turned into full remap all will be revealed later

2.0 bar yeh Luke?

nobby dont spoil it for everyone.

have you got bigger injectors or are you still the standard ones

Right well im home finally after doing my chores once back to newbury but anyway. . . i got down to Leightons today with my tools in hand. Had lil chat etc and it JUST so happened that he had brand new set of 440cc injectors sat on the table but they would obviously require full remap wont they?

but its what we spoke about before anyway and i said yeah go for it. (wallet started to cry )

so now im running 440cc's with 3.8bar FPR so plenty of fuel

Leighton mapped my car to 1.2bar, 1.3bar , 1.4/5bar but i have a real bad case of fluctuating boost which is causing the boost to spike to the set limit on blitz eg 1.4bar then its tailing straight off down to nearly 1.2bar right too redline with boost really pulsing between 0.2bar

this turbo should be holding 1.4bar to redline with no worries.
We have ruled out the Blitz controller as it still done it when we quickly tried manual BV .

Sooo me and leighton have put it down to a small boost leak somewhere which i think ive had one for ages anyhow. Im getting on the case of finding it once and for all.

BUT i did get on rollers today also

and i made 356bhp 296lbs 318wbhp thats with boost spikeing to 1.5 but then tailing off very quickly to 1.2bar so it kills the Torque straight away


Also made 338.6 on another run at lower boost than i made same figures at powerstation before.

would put graphs up but dont have a scanner unfortunatly

once boost is held 1.4bar all way to redline think it will definatly make another 15/20bhp and maybe bit more torque.

Overall im happy although days costing me alot more than expected.

Also too add me and nobby done compression test on tuesday and it was 154 across the board give or take 1/2 psi

I'd best get myself a better foot pump then eh Luke

yes buddy but im 99.9% sure its from around the doughnuts area inlet/plenum the leak that is i might pull the car aprt tomoz afternoon check there not spilt at all

Luke sounds very nice figures, bet it drives well. Have you noticed any difference in the lag?
I have the same boost fluctuations as you on my blitz, will get to 1.4bar then fluctuate constantly by 0.2/0.3 bar. I have checked everything and even cleaned out my solenoids (was better for a while) but the same things keeps happening, however mine does stop with a prv (perfect boost just abit laggier).
I am just going down the route of faulty controller so i am going to get a gizzmo next week.

If you find the cause let me know it might be my problem also.

Ash

Luke - what gain settings are you running on the Blitz?

EDIT - forget that - just re-read your earlier post - it does it with a manual bleed valve

my guess is that its wastegate related - possibly down to lack of backpressure from the bigger turbine housing

hello luke you 100% have a boost leak and my leak was coming from one of the rings inbetween the plenum and inlet manifold.

well done Luke, nice to hear the engine is still healthy with the compression test.

cheers mark, i hear your heading to leighton in the near future

im chuffed with compression as the couoe has been modified for nearly 50,000miles now. (higher than standard that is. sure ruben/rog can back this up of exactly how long.

sure am, should be in the next week or so. Can't wait

If i understand correctly you have only 1.2 bar when you are in the high RPM... so 356HP are reached with only 1.2 bar Great results luke!

I'm sure you can make 370HP with 1.4 bar

you dont know at what rpm he made the 356bhp could have been when it was at 1.5 bar good results luke especially if the turbos not holding to redline should be alot better when it is.

yeah its only spikeing to 1.5var and tailing straight off, will put more details up tomoz

Yes, that was only a guess. Luke said 1.5 bar was only a spike so i can imagine the boost tails quickly after that and stays at 1.2 bar when max power is reached

I'm probably wrong... but i will be happy for Luke if not

It's a shame about the boost leak, I noticed it straight away when turning up the boost as you can actually feel it when driving with the engine and power pulsing.

Generally though the car is driving nicely It was also mapped to 0.8bar which is actuator boost, so four settings on the Blitz. At lower boost it doesn't pulse so it does suggest there is a leak which is exposed as the pressures increase.

I think with a steady boost delivery it should gain another 15-20bhp, so 370bhp+ is the target. It was certainly making more power as the boost was increased, plenty of headroom in the turbo

Since you last drove the car with the old turbo did the boost fluctuate?
How much boost were you running before?
And you have only changed the turbo since then, nothing else?

yes j only changed turbo, injectors. its definatly a boost leak from somewhere which needs to be under x amount of pressure to cause the leak as leighton says. the old turbo did do it too but obviously the rs was expected to drop off to redline so i didnt really notice as much.

Luke - the intake doughnuts can split quite badly, and you can't really see the split when the car is ticking over - however, I reckon as soon as there's some decent boost, the split will be dumping loads of air

Remember mine?



The difference was considerable after they were replaced

yeah i remeber well im gonna spens afternoon trying to sort out the reason

Any chance of a dyno print out this time Luke?