Honda Civic Sold as 788hp 🤔

Honda Civic FN2 that came in with an apparent 788hp. Having been out in the car i could tell it was running nowhere near that so we put it on the dyno to find out. Decent power but no where near the sold as power. With the customers go ahead we looked for issues… turns out a couple of boost leaks one being the waste gate pipe work. With that sorted and smoke tested etc. We headed back on the dyno. So there will be more to come!
We all knew it wouldn’t reach the HP stated as the turbo is small visually and it’s running 1000cc injectors, although a fuel pressure of 70psi base meaning - theoretical 90psi + under boost. (I haven’t yet done a run to see if pressure drops off, I should think it does ) but we’ll check this next time.
Turbo is apparently a non genuine GTX3071r and I’ve put up the compressor map so you can see airflow for yourself. If you look you can see from the compressor map it’s not going to make the hp stated. With the right fuel and pushing it to the limit we might over 600-650 but I think it unlikely. One thing to note is the exhaust housing is tiny. Again no markings but I’d say something in the region of 68mm. Better for spool although it’s spoiling slowly 🤷🏻‍♂️… at peak rpm it’s going to be restricting the system significantly.. To flow numbers in the 600+ area the turbo is loosing efficiency quickly and I suspect that’s what we can see in the graph as boost pressure tails off at higher rpm as it can’t maintain the flow rate to support the boost level. Remember boost its restriction not flow. Still an impressive power level though at these levels the car is really undrivable unless doing roll racing or 1/4 miles etc.
As a side note this isn’t a dig at anyone, every dyno reads differently regarding hp figures, we can easily make this read 700+hp by changing some things on the dyno. The reality is that we run 1000s of cars and we run them all the same way. The variations in tyre compounds does make a difference but that’s about the only changing variable that isn’t accounted for. We generally find the figures on our dyno match a superflow engine dyno to within a couple of flyhp at the 300hp mark. You can extrapolate that how ever you like. Air flow isn’t a guaranteed way of working out hp but you can be sure you can’t make more hp the airflow allows.

[@Gloopyfishing]

It was 788 before they took off the 65mm turbo

[@IAMotorsport]

What 65mm turbo do you think was on there ?

[@Gloopyfishing]

Garret

[@IAMotorsport]

@@Gloopyfishing 🤣

[@WalshEBoY]

Wouldn't trust the company / garage that built it that's now dissolved, looks like its now running a more track friendly spooly turbo

[@IAMotorsport]

It was sold as is with 788hp and no changes since making that number. So here lies the problem.