My stage 2, 998 A+
Turbo Mini Forums

That was the dwell, too short. Now it makes 100hp @0.90bar and 5200 rpm. Assuming 15% transmission losses, which is low.

std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm

0.9 bar boost
blue is power
red is torque

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Edited by alpa on 21st Jun, 2010.

std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm

Peak torque at 5200 !

Am I wrong thinking there is something odd when peak torque and peak power happen at the very same RPM ?

Do you regulate torque at lower rpm to save the gearbox life ?

If not, I tend to believe the cam is too big ...
(trying to make me feel better about the 256 I bought)

Rusty by nature

The camshaft is timed properly, I did it on the bench and the chain (double) had 10000km.
The torque is reached at 4500 when measured in 3rd, but the peak is still at 5300. Also I'm using the MPi intake which is not really a MPi plenum to me even if runners are long and strait.
I think if I had a better designed exhaust I would get torque past 6000.

Unfortunately I can not find RR curves for turbo 998 or even 1300. Except the Paul's one, but he has some "secret" cam so who knows what's that.

Still the car is perfectly drivable in the traffic and you just don't imagine what you are driving until you go past 3500rpm.

std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm

For the camshaft I meant too big as in too much duration compromising low end torque when the turbo is not boosting

Rusty by nature

I understand what you mean about cams. But 266 is definitely not a long duration cam, just a bit more than 256 which is a good street cam.
The intake flows enough because otherwise I'd have a boost drop. I just think the poor exhaust creates too much counter-pressure past 6000.
I'm looking for RPM because
Power = torque * RPM
So to save the transmission and have power it's better to go high. 7000rpm being the limit for standard bottom (that I have) I limited at 6500.
It's standard and then fast. With a smaller turbine it'd work better at bottom.
So pistons are standard and probably having 200,000 km.
CR : I don't know, it's a std g295 head with A+ flat pistons bottom. I know it's good for 1bar, I even did not try to get numbers.
I'm not really trying to push the stuff farther, it's my daily car even if I'll go at track days. I wanted 100hp, I got them. I'm sure with more time and less constraints of hiding things I could make better.
I did not check the yellow book, I'm not a fun. I'll see if I find something.

Edited by alpa on 23rd Jun, 2010.

std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm

Thanks for your straight answers.

Yellow book I mentionned for the curves you said you wanted to see.

I just checked and on low boosted 1275 peak torque is at 3500 ... (page 356)

Hiding things is not really mandatory because either people don't have a clue what they are looking at (no need to hide) or they know what's going on and then whatever efforts you made to hide things is not gonna be enough ...

My point, anyway ...

Keep up the good work !

A long time ago I asked you about your Metro front mounted rad as I understood you said you didn't cut anything to slip it in, can you confirm if things had been cut off and if you alternator is standard Mini jobbie ?

Rusty by nature

I assume you have developed the power curve from a G measurement?

Was that power curve taken in 1st gear?

My 998T takes a while to spool up in 1st. It an inertia thing, I think. So it only gets full boost by around 5000rpm.

On the road, in second and third, full boost is around 4500 rpm.

But on the rolling road in top it made full boost at 4000rpm.

Your torque curve will depend very much on the rate at which the turbo can accelerate to give full boost.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Paul:
It's taken in 2nd, I never do that in first simply because it'd spin tyres. It's not an G acceleration, it's based on the recorded engine's RPM, weight and many other things, this software is very accurate (BTW it was developed on a Mini, it's quite known in France, PowerDyn).
In 3rd it reaches max boost at 4500 but in 3rd it's less precise as there is wind resistance, 6000 in 3rd is 140km/h.

Advantage:
hiding: it's mandatory to have stock appearance with closed hood. So I/C is difficult to place. MOT controllers don't notice IHI.
rad: I cut the front longside/below the bumper and removed the crossbar that links front lights. Before the rad was fixed on the engines frame, this time I welded fix points to the body.
Alternator is standard and not moved. Fan is a 10" from ebay in US, $35 I think.

Edited by alpa on 23rd Jun, 2010.

std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm

Hey, 5 + 7 kg off :)
Then poly windows and sparco seats and all unnecessary load, should be 650kg next time.

std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm

The other problem is to find good tires for my 12" steel rims. Mine spin.

std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm

Rusty by nature

They are not blind, it's hard to notice IHI if you don't know what to look for, it's totally underneath intake manifold. Ok the DV is a bit visible, I'd prefer it in black.
I admit I have injection but they don't care, it's not their business. If for example you replace the engine with an electric motor then the car will be rejected because it does not make emissions LOL.

std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm

How about PowerDyn, is it user friendly ?

Rusty by nature

PowerDyn is very easy to use. But you have to have a clean signal from the engine or ABS sensor. Low voltage ignition is the best source. I use an old version I bought years ago, I'm not aware about evolutions.

std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm

A short update.
I replaced injectors with 65lb modern Siemens ones, 4 jet nozzle. It's amazing how engine is smoother than with previous 50lb Delphi old design typed (bought brand new). And power/torque went up.
109hp at 800mbar. Of course "too much is not enough" however I'll stay with this performance.

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Edited by alpa on 4th Sep, 2010.

std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm

Your car must be a surprise to all those Cooper look alike owners, GTi's and so on ;-D

Rusty by nature

That's a good result. It's now running very similar figures to mine - 998/g295/T2 0.85 bar 112hp @5700 105lbft.

Next step is to increase the rev limit, ported head and a GT1752 to see if I can hold that torque up to 7500rpm

At the moment I hit the rev limiter when it is still pulling like a train.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Very similar figures to mine too (at a gusss).

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

www.twin-turbo.co.uk

Wich one Wil, the 20 hours daily ?

Rusty by nature

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

www.twin-turbo.co.uk

On 5th Sep, 2010 sturgeo said:

On 5th Sep, 2010 Paul S said:

At the moment I hit the rev limiter when it is still pulling like a train.

Especially since you realised you had the soft cut limiter coming in at 5500rpm

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm

Is the 998 gearing that high ???

On the top of my head, 130 km/h was 4,8K rpm so your 5,7 are 160 ish ?

Am I totally wrong ? (it's been a while since I drove the mini ...)

Rusty by nature