I've attched copies of printouts.

 

Car is a 93 Import Twin Turbo.

 

Has boost jets, zedworld chip, japspeed decats and kakimoto backboxes, apexi filter, arc side mount intercoolers and running colder plugs.

 

Boost jets are supposed to be giving a bar, but on the graph it's making around 0.83 or so.

 

Torque figure seems ok to me, but power seems low?

What size jets have you got fitted?

is this wheel bhp or at the flywheel

If that's at the fly that's not right. Mine on stock ecu(no chip) stock boost (9psi) and auto turbos made 283bhp at the fly or 279bhp corrected fly wheel figure whatever that means.

In my experience you should be making 330-340fwhp on that chip and 14psi.

Edited June 23, 201411 yr by Stephen

If that's at the fly that's not right. Mine on stock ecu(no chip) stock boost (9psi) and auto turbos made 283bhp at the fly or 279bhp corrected fly wheel figure whatever that means.

 

so you car after all them years has lost no power from them its was new that's pretty going

so you car after all them years has lost no power from them its was new that's pretty going

 

It's not 100% stock it's got divorced down pipes, cat back and cone filter. But yeah it sounds as if mines pretty healthy.

I would what it would have made 100% bone stock out off all the cars I have had a dynod stock before engine work was the Porsche boxster 3.2 was went to be 260 and made the 260 most car don't make the bhp claim

Mate that looks a good graph to me, really smooth and making stock power. You are lucky your jets are giving you that boost, mine gave me 21 psi that I didn't discover 'till about 1500 miles later when I fitted an after market boost gauge that went higher than the stock one. I immediately fitted an electronic boost controller to lower it and it ran a lot better. A generic chip will never be as good as a rolling road session. My rolling road session was cheaper than the jets and chip that gave me 21 psi then 330hp after I reduced the boost to 14psi with ebc.

 

But that aside that looks a lovely smooth power curve and I assume its RWHP.

I would assume that too, if you guesstimate the trans loss and put it on you've got that figure 330ish fwhp.

That being said the graph does say flywheel power and flywheel torque.

How could it be so smooth and healthy looking but down 50hp??? I'm not saying that it isn't the case but seems strange?

so its making 37 more bhp than stock if at the fly

Anyway, never mind any of this, does it feel fast, if the answer is yes, scrumple that bloody graph up :thumbup1:

no don't crumple the graph as this mite point out a issue going on if its not making the correct power for the mods done I ment scrumple lol

It's very very odd, maybe an expert like Noel will shed some light.

It's defo flywheel horsepower.

 

The car drives fine and feel quick enough, but just going on many other cars with similar mods, I seem to be down on the power front.

 

When I changed the plugs last year I did a compression test, all 6 where between 162 and 167, I'm told a perfect engine is 175, so going on that I'd say the block is ok.

 

I know it isn't running a bar boost like the boost jets should be going, more around 12psi, but was still hoping for more than 317bhp.

Also are other people thinking the same as me?

 

Torque decent but power not so good?

what did the dyno operator say ?

The AFR should be able to allow someone with the knowledge to say you can safely turn the boost up some more or not, have you tested for boost leaks? tbh as I said earlier generic chip and 14 psi normally equals about 330-340fwhp depending on the chip and overall health, so at 12psi its not really far off that.

He thought the car was running standard boost, and expected the car to make around 350 based on other Zeds he had seen.

 

But he also said there did not seem to be anything wrong with the car.

 

- - - Updated - - -

 

Haven't checked for boost leak tests mate, how would I go about that on a Zed?

do you have an accurate boost guage ?

It's pretty lucky/hard to make 350-370 that gets quoted on the average chip you'd need way more than 12psi on stock turbos generally as well. If you want to make power on stock tubs a custom map is the way forward, safer too.

 

You need a boost leak detector bung and a compressor, plenty of how to's on here.

do you have an accurate boost guage ?

 

The boost figures I'm quoting are from the dyno run sheet, the in car boost gauge is reasonably accurate though as it sits before 14 at where I would put a 12.

 

I have a spare accurate boost gauge I used before when tuning an old Renault 21 Turbo though.

 

Will look into getting a boost leak tester just to be sure there is no issues there.

pm noz mate, he is the guru, but I bet that car is totally fine and the figures are wrong, or he set the air pressure (atmospheric) wrong or there was a dead crow under the rollers or something. I think a boost leak is unlikely with that steady peak boost.

 

I am prepared to eat humble pie, but I hope for you and the car's sake that I am right.

This is my car on a zedworld chip and similar mods to yours.

 

 

this is it after nothing more than a noz map

 

you need a proper after market boost gauge fitting and a manual boost tap there like £20ish set the boost bang on were you need it boost jets are crude and are hit or miss