sptuning said:

I'll try and dig out vesseys power runs and post them, to clear up the confusion.
It was pulling extra 55-60hp and 85-90ft/lb @3000rpmish.
I agree dump valves don't give more peak hp but they can improve extra low down power. Removing the valve on this car resulted in a loss of 25ft/lb torque and 15-20hp @3000.
We've also mapped a 120ps fitted with arbarth turbo, it made 196hp...peak.
As far as I'm aware cars with the 130,150,155ps engines are all fitted the same turbo charger, the 120ps model is different;-)
I'm happy to hold a rolling road day for those who want accurate repeatable results for there cars.....pm me

J.

Click to expand...

So on a standard 120, you can get 60bhp peak ??

trich926 said:

So on a standard 120, you can get 60bhp peak ??

Click to expand...

Yes it can be done, not 60bhp on top of the 120bhp but a 60bhp gain at lower rpm where the stock mapping limits the load. The problem is tuners quoting the gains on the peak power and the customer expecting that amount to be added to the factory quoted peak power. If tuners know what they are doing the will quote the bulk bhp gain and tell you where the gains will be in the rpm range. Its the door step mapper without rolling roads who have started bumping up power peak outputs by adding the gains on to the quoted peak power.

Its like the Seat Leon Cupra 225ps 1.8T, a remap gives 40bhp 60lbft gain, making the car go like a rocket, but on a rolling road 9 times out of 10 they will only see 230ps or even 220ps..lol Even with stage 2 and £1000s spent on hardware mod they only get 20bhp on the peak, but every is happy:slayer:
http://www.jkm.org.uk/performance/GallerySCN280309.htm

http://www.jkm.org.uk/performance/GallerySCN150907.htm

Some care can make good power on the peak, I custom tuned a mk5 Golf GTi 2.0TFSI and went from 230ps to 330ps, plus 140ps gains in the mid range. This was just from the stock ko4 turbo and upgrade exhaust system, then they do a 200ps version with the smaller turbo that will only make 60bhp in the midrange and 50bhp peak.

Nick

RTech said:

Yes it can be done, not 60bhp on top of the 120bhp but a 60bhp gain at lower rpm where the stock mapping limits the load. The problem is tuners quoting the gains on the peak power and the customer expecting that amount to be added to the factory quoted peak power. If tuners know what they are doing the will quote the bulk bhp gain and tell you where the gains will be in the rpm range. Its the door step mapper without rolling roads who have started bumping up power peak outputs by adding the gains on to the quoted peak power.

Its like the Seat Leon Cupra 225ps 1.8T, a remap gives 40bhp 60lbft gain, making the car go like a rocket, but on a rolling road 9 times out of 10 they will only see 230ps or even 220ps..lol Even with stage 2 and £1000s spent on hardware mod they only get 20bhp on the peak, but every is happy:slayer:
http://www.jkm.org.uk/performance/GallerySCN280309.htm

http://www.jkm.org.uk/performance/GallerySCN150907.htm

Some care can make good power on the peak, I custom tuned a mk5 Golf GTi 2.0TFSI and went from 230ps to 330ps, plus 140ps gains in the mid range. This was just from the stock ko4 turbo and upgrade exhaust system, then they do a 200ps version with the smaller turbo that will only make 60bhp in the midrange and 50bhp peak.

Nick

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okay cool, you know alot of interesting stuff ! ha
I suppose it as matt says, if the car drives well and the power feels good then it doesn't matter what the output is.
What do you believe the limit is for the tjet turbo ?
RedDot told me it was 160bhp.

here are example dyno plots for the 120ps.

sptuning said:

here are example dyno plots for the 120ps.
View attachment 81201

Click to expand...

That looks dangerously high at such low revs

Vance said:

That looks dangerously high at such low revs

Click to expand...

Vessey wanted as much power as we could get , he has been running this setup since January, and he drives it hard.
Car was running on normal unleaded at the time of testing, if it was running on recommended 98ron we would of produced even better hp's.
J.

sorry to sound abit dumb, which line is torque and which is hp ?

sptuning said:

Vessey wanted as much power as we could get , he has been running this setup since January, and he drives it hard.
Car was running on normal unleaded at the time of testing, if it was running on recommended 98ron we would of produced even better hp's.
J.

Click to expand...

Won't that map kill his engine, turbo etc

Vance said:

Won't that map kill his engine, turbo etc

Click to expand...

Why would it?





@trich926

Torque line is the one that climbs higher at earlier rpms.

okay cool, kinda looks like my graph

RTech said:

Why would it?





@trich926

Torque line is the one that climbs higher at earlier rpms.

Click to expand...

Just thought it would be working the engine components too hard.

Vance said:

Just thought it would be working the engine components too hard.

Click to expand...

I bet the block, rods, pistons, head could easy cope double the stock power, 240bhp+ any more I would think H-beam rods and rod bolts would be needed.
What kills engine is the chemistry side of the tuning, too much ignition knock / pre det , lean lambda conditions, sky high exhaust gas temps.

My own 1.8T engine is 150bhp 164lbft stock, but can easy cope with 350bhp 340lbft with out changing any part on the head or block, just by bolting on a Gt2871 turbo, 440cc injectors, fuel pump and remap.

In the old skool day everyone just wacked the boost right up and blew turbos because the fuel did not match the boost.:yum:


Nick