Got a problem..............increased my boost from 1 bar to 1.2 bar and got exactly the same result.......same figure............the funny thing is the graph is exactly the same.....at 1bar and 1.2 bar....thats whats stumped me....if it was a restriction of some sort then it would show on the dyno graph surely ...(by this i mean an increase in boost to 1.2 bar would show an increase lower down the rev range but maybe going further up the rev range it would be closer to the 1 bar graph)

hope this makes sense

just cant think what is happening.....

Im getting a 0.1 psi pressure drop accross the Intercooler...i have a 4 inch exhaust all the way through.........
I;m stumped

anybody come across the same problem?

 

A few more details about your setup would help me answer you question. What engine do you have, what turbo, how much power are you making at 1.0 bar? Have you checked you ignition system?

 

ok...big street port, t88h 38gk, 458rwhp at 1 bar....ignition system is ok..no problems at all

 

That's a pretty big turbo. I think it has a 76mm inducer. I don't think you will see much of a difference in such low boost areas. It is not in the efficiency range. You will see huge increases after 20psi or in the higher boost ranges.

Those larger turbos, even though they are in T4 flanges really need the higher boost levels to see their potential.

Anthony

 

How did you increase the boost? Are you sure the boost really went from 1 to 1.2 bar? Just because you tell the controler to raise the boost doesn't always mean that it did so. Is the wastgate opening before it should? You may also want to check fuel pressure; I have seen clogged fuel filters and bad wiring cause this sort of problem.

 

How are you measuring the boost pressure? A 0.1 psi drop across the intercooler is not realistic, so I wonder if you also have an error measuring the manifold pressure.

 

yes boost did go up both wideband and datalogit confirmed this...( reading from a different part of the map).....

wastegate and fuel pressure were fine.

what i found puzzling is we did an overlay graph from another fd that had a t8833d and a half bridge motor........the power and torque curve was almost identical...the only difference is that the power came in earlier and went on for about 700rpm later..........jsut an off the cuff thought but could it possibly be a dyno error....coz the operators said that they seem to have problems when a car gets to around 430-450 rwhp.........They were saying that the sweet spot for a t51 is normally one bar...and they were saying it must be the same for mine...but i just refuse to believe that.......I'm now seriously thinking DyNO...coz there is no way a t88 33d half brigde motor should have virtually the same power and torque curve as me and im on a street port.....or am i going mad.

The dyno is a DynoDynamics

 

sorry i meant 1psi drop

 

450rwhp on a dyno dynamics is pretty damn impressive, at 1 bar that T88 is just jogging though. You'll need some real boost to realize the gains you're after.

 

anyone else think its the dyno?

 

have you confirmed ZERO boost leaks with a pressure tester?

 

yes no boost leaks