sparkywrx94

What are the most efficient/maximum boost levels throughout the rev range for a std TD05 turbo.

Cheers

Mark

Jolly Green Monster

iTrader: (4)

Mine seems to like 1.3bar.. 1.4bar shows little gain on the butt dyno but 1.6bar was stonking but I got worried about frying standard internals and so stuck with 1.3bar..

Have fmic, walbro pump, fse reg and link ecu btw..

you noticed the real pull tohught above about 1.05bar I found.. so even 1.1bar was nice.

Simon

john banks

Most efficient and maximum are two different things.

Additionally, most efficient will not be the point where least heat is added to the charge and the lowest exhaust back pressure is present.

With supporting mods (headers, injectors, fuel pump, regulator, FMIC, inlet, exhaust, breathers done, remap, clutch, consider the gearbox), 1.5 bar midrange dropping to 1.25 bar at 6000 RPM is quite nice.

Jolly Green Monster

iTrader: (4)

what John said.. lol

I am holding 1.3bar to the red line at the moment.

Simon

sparkywrx94

I have 2.0 closed deck block
omega pistons
subaru n10 rally car conrods
hybrid FMIC
revolution DP
magnex exhaust system
breathers
ported headers
walbro pump
modified oil pump
Gems.

Why do we tail off towards high revs. What can my internals take

cheers

Jolly Green Monster

iTrader: (4)

best bet would be to take advice from who ever is mapping the Gems..

as you shouldn't be altering boost without remapping it.

Bob Rawles and Pat probably best places.

sparkywrx94

Its getting mapped at the same place where im having the work done, I need to know my turbo limits and what to aim for before we map it wheather the engine can take it or not.

john banks

Your internals could take way more than the TD05 can throw at them. Dropping the boost at the top, or rather running more in the midrange, allows you to run a beefier torque curve whilst not exceeding the flow limitations of the turbo.

Since you have uprated internals, you could run a bit more midrange still. I tried 1.7 bar on the TD05 and it was rather effective. But then you really notice how lacking the top end feels in comparison, like an exceedingly fast diesel LOL.

Jolly Green Monster

iTrader: (4)

well if they cannot tell you that then surtely you should take it elsewhere?

Scott.T

iTrader: (2)

JGM, get back to work....

Jolly Green Monster

iTrader: (4)

Ditto

sparkywrx94

John,

I want torque and lots of it through the mid range, you say 1.25 at 6000, is that a flow limitation of the turbo or is that to protect the internals, I am under the impression that high boost at high revs is dangerous. Am i right or can my internals handle high boost at high revs?

john banks

Your internals could probably take 2.0 bar at 7000 RPM.

With good breathing, the TD05 will start to lose power from what I've seen if you go wildly over 1.25 bar at 6000 RPM, assuming your breathing is sorted, at least on UK cams on MY99/00, without fuel additives (octane booster, methanol). If you run more boost you end up retarding the ignition too much to cope and you can easily lose power.

High boost at high RPM with the right turbo, breathing and internals = a lot of fun.

stevebt

iTrader: (8)

mine ran 1.6 bar quite happily

sparkywrx94

thanks

That put my mind at rest, another thing I have to worrie about is the 9:1 compression ratio im using!!! Which will affect the amount of boost and timing I can use if I map to optimax, I might map with octain booster and even use water injection depending on what I can get away with on optimax. I dont know if many people have tried a compression ratio of 9:1 but this should be fun!!. Should get plenty of throlttle responce and good off boost performance. I may even save a seperate map for race fuel on the drag strip etc. but keep to just optimax and a tame map for the road.

Oh and Its a 94 wrx which will have hydraulic lifters and std cams. any comments?

sparkywrx94

anyone?

Jolly Green Monster

iTrader: (4)

at 1.3bar I can run 27º @ 6000rpm and it is still not sparkly.. I have not pushed it further as I have to run 20º @ 5000 and cannot step the timing up that quick so the midrange on mine is hampering the higher rpm..

whether it is safe to do so is another matter..

I did have it overboosting to 1.6bar and added fuel and removed timing to allow it to run it and it was fooking quick but I had to lift off at higher rpm as it was holding 1.6bar to redline!! I exceeded the boost of the standard map sensor and so the ecu though I was at 1.15bar boost.. lol

sparkywrx94

well im itching to get my car back on the road, its been over two weeks now, will no doubt be going back for a new gearbox tho, dont think it will last long with the new power.

Anybody got any suggestions for gearbox, I thought an sti 5/6 box may do the job or am I better off going for a six speed. Can I drop six speed in without having to change diffs etc.

Aztec Performance Ltd

iTrader: (234)

People running with STi5/6 boxes seem to be ok.

6 speed will need diffs etc.

Bob